What are the cheapest airlines flying from London Heathrow Airport to Seattle round-trip?

According to our current data, Icelandair (£418), Lufthansa (£448), and United Airlines (£450) offers the cheapest pricing from London Heathrow Airport to Seattle. Icelandair is priced at 33% lower than the current average price of a flight leaving 3 months from now.

What are the cheapest airlines to fly from London Heathrow Airport to Seattle one-way?

The cheapest airline one-way is Aer Lingus, with whom users have recently found tickets for as low as £402. However, be on the lookout for offers from WestJet and Icelandair, as they are both options that can get you from London Heathrow Airport to Seattle for a low price.

What are the cheapest flights from London Heathrow Airport to Seattle?

The cheapest flight price from London Heathrow Airport to Seattle is £418. On average you can expect to pay £1,112. The most popular route, (London Heathrow - Seattle/Tacoma Intl), can usually be booked for £422.

What are the most reliable airlines from London Heathrow Airport to Seattle?

Consider Singapore Airlines (89%), KLM (85%) or Air France (85%) when booking your flight. These represent the most reliable airlines when flying from London Heathrow Airport to Seattle.

What are the most popular airlines that fly from London Heathrow Airport to Seattle?

When booking a flight from London Heathrow Airport to Seattle, you may want to consider flying on Air Canada, Air France or Finnair as they are the most popular for this route.

What is the cheapest day to fly round-trip from London Heathrow Airport to Seattle?

Users have found that flying from London Heathrow Airport to Seattle on a Saturday typically leans towards higher prices. However, this doesn’t mean you still can’t find a deal. Flexibility with other aspects of your flight can still land a great price for your trip.

How far in advance should I book a flight from London Heathrow Airport to Seattle?

Find a great deal and save up to 37% by booking at least 44 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from London Heathrow Airport to Seattle within the next two weeks, with the cheapest ticket starting at £612.

What is the cheapest month to fly from London Heathrow Airport to Seattle?

Due to multiple factors, expect to potentially pay more when booking in August. For low rates, January can be a great choice for travel to Seattle. Flights to Seattle from London Heathrow Airport in January are about £616 on average during January, but can be found for as low as £350.

What airport do you fly into for flights to Seattle from London Heathrow?

If you book a flight to Seattle from London Heathrow, you will be flying to Seattle/Tacoma Intl, which is the city’s only airport. Seattle/Tacoma Intl (SEA) is located 11.4 mi from the center of Seattle. There are 9 flights from London Heathrow to Seattle/Tacoma Intl per day from 12 different airlines.

Can I find deals for flights from Heathrow to Seattle that include hotel bookings?

Yes. In addition to deals on Heathrow to Seattle flights, Cheapflights offers holiday packages that include both flights and hotel.

How can I find direct flights from Heathrow to Seattle?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to Seattle.

Can I find deals for business class flights from Heathrow to Seattle?

Yes. Cheapflights offers flight deals from Heathrow to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

£399+ Flights from London Heathrow Airport to Seattle

The best prices from London Heathrow to Seattle/Tacoma Intl are usually found in November or January, booked 54 days in advance, depart on a Tuesday or Wednesday and return on a Monday

Cheap flight deals from Heathrow to Seattle

Round-trip from	£418
One-way from	£399
Popular in	July
Cheapest in	November
Average price	£557
Good round-trip deal	£492 or less
Good one-way deal	£560 or less

Icelandair
19/3-1/4
2 total stops
24h 55m total
London to Seattle

Search Deals

13/4
2 total stops
45h 03m total
London to Seattle

Search Deals

Highest demand for flights based on searches. 15% potential increase in price (£89 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease (£13 potential savings vs. average return price).

Search Deals

Average for round-trip flights in February 2025

Search Deals

Price to beat on a round-trip flight from London Heathrow to Seattle/Tacoma Intl.

Search Deals

Price to beat on a one-way flight from London Heathrow to Seattle/Tacoma Intl.

Search Deals

Find flight deals from Heathrow to Seattle

Cheapest flights from Heathrow to Seattle
Explore the most affordable flight options available from Heathrow to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 14 February 2025.

Wed 19/312:15LHR - SEA

1 stop12h 45mIcelandair

Tue 1/415:45SEA - LHR

1 stop12h 10mIcelandair

Deal found 12/2£418

Thu 20/306:30LHR - SEA

1 stop13h 40mLufthansa

Wed 2/408:15SEA - LHR

1 stop14h 40mLufthansa

Deal found 12/2£448

Wed 5/306:30LHR - SEA

2 stops23h 00mUnited Airlines

Thu 20/315:05SEA - LHR

1 stop12h 05mUnited Airlines

Deal found 12/2£450

Thu 20/308:55LHR - SEA

2 stops19h 35mAir Canada

Wed 2/405:45SEA - LHR

2 stops16h 45mAir Canada

Deal found 12/2£453

Wed 5/306:30LHR - SEA

2 stops16h 00mMultiple Airlines

Sun 16/310:35SEA - LHR

1 stop16h 35mMultiple Airlines

Deal found 12/2£455

Tue 25/214:50LHR - SEA

1 stop31h 31mWestJet

Tue 4/315:15SEA - LHR

1 stop13h 35mWestJet

Deal found 12/2£462

Tue 25/206:30LHR - SEA

1 stop13h 16mKLM

Tue 4/317:45SEA - LHR

Nonstop9h 25mKLM

Deal found 12/2£463

Fri 28/206:00LHR - SEA

2 stops24h 42mSWISS

Wed 12/314:50SEA - LHR

2 stops20h 00mSWISS

Deal found 13/2£469

Sat 15/313:05LHR - SEA

Nonstop10h 00mVirgin Atlantic

Sat 22/306:20SEA - LHR

1 stop17h 45mVirgin Atlantic

Deal found 13/2£470

Tue 25/213:15LHR - SEA

Nonstop10h 00mAir France

Fri 7/319:25SEA - LHR

Nonstop9h 45mAir France

Deal found 12/2£474

Thu 27/206:30LHR - SEA

1 stop13h 16mDelta

Mon 3/317:45SEA - LHR

Nonstop9h 25mDelta

Deal found 12/2£484

Tue 4/309:25LHR - SEA

Nonstop9h 55mBritish Airways

Tue 11/314:35SEA - LHR

Nonstop9h 25mBritish Airways

Deal found 11/2£487

Best flights from Heathrow to Seattle
Discover carefully curated flight deals from Heathrow to Seattle that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 14 February 2025.

Wed 19/312:15LHR - SEA

1 stop12h 45mIcelandair

Tue 1/415:45SEA - LHR

1 stop12h 10mIcelandair

Deal found 12/2£418

Thu 20/306:30LHR - SEA

1 stop13h 40mLufthansa

Wed 2/408:15SEA - LHR

1 stop14h 40mLufthansa

Deal found 12/2£448

Wed 5/306:30LHR - SEA

2 stops23h 00mUnited Airlines

Thu 20/315:05SEA - LHR

1 stop12h 05mUnited Airlines

Deal found 12/2£450

Thu 20/308:55LHR - SEA

2 stops19h 35mAir Canada

Wed 2/405:45SEA - LHR

2 stops16h 45mAir Canada

Deal found 12/2£453

Wed 5/306:30LHR - SEA

2 stops16h 00mMultiple Airlines

Sun 16/310:35SEA - LHR

1 stop16h 35mMultiple Airlines

Deal found 12/2£455

Tue 25/214:50LHR - SEA

1 stop31h 31mWestJet

Tue 4/315:15SEA - LHR

1 stop13h 35mWestJet

Deal found 12/2£462

Tue 25/206:30LHR - SEA

1 stop13h 16mKLM

Tue 4/317:45SEA - LHR

Nonstop9h 25mKLM

Deal found 12/2£463

Fri 28/206:00LHR - SEA

2 stops24h 42mSWISS

Wed 12/314:50SEA - LHR

2 stops20h 00mSWISS

Deal found 13/2£469

Sat 15/313:05LHR - SEA

Nonstop10h 00mVirgin Atlantic

Sat 22/306:20SEA - LHR

1 stop17h 45mVirgin Atlantic

Deal found 13/2£470

Tue 25/213:15LHR - SEA

Nonstop10h 00mAir France

Fri 7/319:25SEA - LHR

Nonstop9h 45mAir France

Deal found 12/2£474

Thu 27/206:30LHR - SEA

1 stop13h 16mDelta

Mon 3/317:45SEA - LHR

Nonstop9h 25mDelta

Deal found 12/2£484

Tue 4/309:25LHR - SEA

Nonstop9h 55mBritish Airways

Tue 11/314:35SEA - LHR

Nonstop9h 25mBritish Airways

Deal found 11/2£487

Direct flights from Heathrow to Seattle
Explore direct flight options from Heathrow to Seattle based on user searches, and compare prices and availability for your desired travel dates. Data last updated 14 February 2025.

Thu 20/312:40LHR - SEA

Nonstop10h 00mVirgin Atlantic

Wed 2/417:35SEA - LHR

Nonstop9h 50mVirgin Atlantic

Deal found 12/2£466

Wed 19/315:50LHR - SEA

Nonstop10h 15mKLM

Tue 1/420:20SEA - LHR

Nonstop9h 55mKLM

Deal found 12/2£470

Thu 13/312:40LHR - SEA

Nonstop10h 00mAir France

Mon 7/417:35SEA - LHR

Nonstop9h 50mAir France

Deal found 13/2£473

Fri 28/209:25LHR - SEA

Nonstop9h 55mBritish Airways

Sat 8/318:50SEA - LHR

Nonstop9h 25mBritish Airways

Deal found 12/2£481

Thu 20/312:40LHR - SEA

Nonstop10h 00mDelta

Wed 2/420:20SEA - LHR

Nonstop9h 55mDelta

Deal found 12/2£493

Tue 11/309:25LHR - SEA

Nonstop9h 55mFinnair

Tue 18/319:50SEA - LHR

Nonstop9h 25mFinnair

Deal found 12/2£497

Thu 20/215:00LHR - SEA

Nonstop9h 55mAmerican Airlines

Sat 8/313:45SEA - LHR

Nonstop9h 25mAmerican Airlines

Deal found 12/2£504

Thu 20/315:00LHR - SEA

Nonstop9h 55mIberia

Wed 2/420:20SEA - LHR

Nonstop9h 20mIberia

Deal found 13/2£505

Thu 27/215:00LHR - SEA

Nonstop9h 55mMultiple Airlines

Sat 8/313:45SEA - LHR

Nonstop9h 25mMultiple Airlines

Deal found 12/2£524

Last-minute flights from Heathrow to Seattle
Discover last-minute flight deals from Heathrow to Seattle. Data last updated 14 February 2025 and is based on user searches.

Tue 18/213:00LHR - SEA

1 stop17h 07mAir Canada

Tue 25/205:45SEA - LHR

2 stops17h 25mAir Canada

Deal found 11/2£489

Tue 18/220:40LHR - SEA

1 stop28h 20mIcelandair

Tue 25/214:35SEA - LHR

1 stop12h 15mIcelandair

Deal found 12/2£553

Tue 18/217:45LHR - SEA

2 stops36h 53mAer Lingus

Tue 25/223:48SEA - LHR

2 stops25h 27mAer Lingus

Deal found 12/2£776

Wed 19/206:30LHR - SEA

1 stop13h 16mKLM

Wed 26/219:05SEA - LHR

Nonstop9h 35mKLM

Deal found 12/2£484

Wed 19/213:15LHR - SEA

Nonstop10h 00mVirgin Atlantic

Tue 25/217:45SEA - LHR

Nonstop9h 25mVirgin Atlantic

Deal found 12/2£485

Wed 19/213:00LHR - SEA

1 stop28h 57mMultiple Airlines

Wed 26/209:20SEA - LHR

2 stops16h 50mMultiple Airlines

Deal found 12/2£492

Wed 19/215:00LHR - SEA

Nonstop9h 55mFinnair

Thu 27/207:00SEA - LHR

1 stop15h 20mFinnair

Deal found 12/2£512

Thu 20/212:40LHR - SEA

Nonstop10h 00mDelta

Wed 26/219:05SEA - LHR

Nonstop9h 35mDelta

Deal found 12/2£495

Thu 20/215:00LHR - SEA

Nonstop9h 55mAmerican Airlines

Sat 8/313:45SEA - LHR

Nonstop9h 25mAmerican Airlines

Deal found 12/2£504

Sat 22/209:25LHR - SEA

Nonstop9h 55mIberia

Mon 10/307:00SEA - LHR

1 stop17h 20mIberia

Deal found 12/2£529

Sun 23/206:50LHR - SEA

2 stops23h 52mUnited Airlines

Sat 8/312:16SEA - LHR

1 stop13h 59mUnited Airlines

Deal found 12/2£471

Sun 23/213:05LHR - SEA

Nonstop10h 00mAir France

Thu 6/313:35SEA - LHR

1 stop12h 55mAir France

Deal found 12/2£692

One-way flights from Heathrow to Seattle
Search for one-way flight options from Heathrow to Seattle. Find affordable one-way fares based on user searches. Data last updated 14 February 2025.

Sun 13/421:25LHR - SEA

2 stops45h 03mMultiple Airlines

Deal found 13/2£399

Wed 26/208:50LHR - SEA

1 stop17h 25mAer Lingus

Deal found 12/2£402

Wed 14/514:10LHR - SEA

1 stop14h 18mWestJet

Deal found 12/2£444

Sat 12/421:25LHR - SEA

1 stop28h 25mIcelandair

Deal found 11/2£500

Fri 14/315:00LHR - SEA

Nonstop9h 55mBritish Airways

Deal found 13/2£506

Fri 14/307:40LHR - SEA

1 stop13h 40mLufthansa

Deal found 13/2£509

Fri 14/315:00LHR - SEA

Nonstop9h 55mIberia

Deal found 12/2£526

Tue 25/209:25LHR - SEA

Nonstop9h 55mFinnair

Deal found 12/2£530

Thu 20/312:40LHR - SEA

Nonstop10h 00mAir France

Deal found 12/2£545

Sun 30/308:25LHR - SEA

1 stop22h 07mJetBlue

Deal found 13/2£589

Find flights from Heathrow to Seattle within your budget

Fly from

Fly to

Route

Depart

Return

Price

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 19/3

12:15-18:00

1 stop12h 45m

Seattle/Tacoma Intl

Tue 1/4

15:45-11:55

1 stop12h 10m

£418

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 20/3

06:30-13:10

1 stop13h 40m

Seattle/Tacoma Intl

Wed 2/4

08:15-06:55

1 stop14h 40m

£448

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 5/3

06:30-21:30

2 stops23h 00m

Seattle/Tacoma Intl

Thu 20/3

15:05-10:10

1 stop12h 05m

£450

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 20/3

08:55-21:30

2 stops19h 35m

Seattle/Tacoma Intl

Wed 2/4

05:45-06:30

2 stops16h 45m

£453

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 5/3

06:30-14:30

2 stops16h 00m

Seattle/Tacoma Intl

Wed 12/3

05:55-07:10

2 stops18h 15m

£455

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 25/2

14:50-14:21

1 stop31h 31m

Seattle/Tacoma Intl

Tue 4/3

15:15-12:50

1 stop13h 35m

£462

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 25/2

06:30-11:46

1 stop13h 16m

Seattle/Tacoma Intl

Tue 4/3

17:45-11:10

Nonstop9h 25m

£463

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 28/2

06:00-22:42

2 stops24h 42m

Seattle/Tacoma Intl

Wed 12/3

14:50-17:50

2 stops20h 00m

£469

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 15/3

13:05-16:05

Nonstop10h 00m

Seattle/Tacoma Intl

Sat 22/3

06:20-07:05

1 stop17h 45m

£470

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 25/2

13:15-15:15

Nonstop10h 00m

Seattle/Tacoma Intl

Fri 7/3

19:25-13:10

Nonstop9h 45m

£474

Flights are sorted by cheapest return flights first.

Deals found on 13/2

Showing 1-10 of 25 results

Best time to book a flight from Heathrow to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Heathrow with our price prediction graph.

Estimated return price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Travel insights for flights from Heathrow to Seattle

Get recent, data-driven insights about flights from Heathrow to Seattle including ideal travel times, pricing trends, and more.

How far ahead should I book a flight from London Heathrow Airport to Seattle?

The best time to book flights from London Heathrow Airport to Seattle is 54 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from London Heathrow Airport to Seattle?

Currently, January is the cheapest month in which you can book a flight from London Heathrow Airport to Seattle (average of £622). Flying from London Heathrow Airport to Seattle in July is currently the most expensive (average of £946). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from LHR to SEA?

It’s typically best to fly out from London Heathrow Airport to Seattle in the evening. Doing so could potentially save you 22% on the flight price compared to flying in the morning, which is usually more expensive.

What is the cheapest day to fly from London Heathrow Airport to Seattle?

Travellers seeking maximum savings on their London Heathrow Airport to Seattle flight should consider departing on Monday evenings when fares are most often at their lowest. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from London Heathrow Airport to Seattle

The most flights from LHR to SEA are scheduled on a Monday (12 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (6 on average).

Rainfall in Seattle by month

In terms of precipitation, rainfall in Seattle ranges from 18.0 - 168.0 inches per month. November is typically the wettest month, when rainfall can reach 168.0 mm. July is typically the driest time to visit Seattle when rainfall is around 18.0 mm.

Temperature in Seattle by month

If weather is an important factor for your trip to Seattle, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 19.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 5.0 C).

Reviews of airlines servicing Seattle

Get a feel of what it's like to fly with Delta, KLM and Finnair from London to Seattle by reading reviews from past customers. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very Good

8,307 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Delta

8.0

Very Good

8,307 reviews

Delta

8.0

Very Good

8,307 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

KLM

7.8

Good

1,334 reviews

Delta

8.0

Very Good

8,307 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Finnair

7.6

Good

1,279 reviews

Delta

8.0

Very Good

8,307 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

SWISS

7.5

Good

1,577 reviews

Delta

8.0

Very Good

8,307 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Virgin Atlantic

7.5

Good

659 reviews

Delta

8.0

Very Good

8,307 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

What airport do you fly into for flights to Seattle from London Heathrow?
If you book a flight to Seattle from London Heathrow, you will be flying to Seattle/Tacoma Intl, which is the city’s only airport. Seattle/Tacoma Intl (SEA) is located 11.4 mi from the center of Seattle. There are 9 flights from London Heathrow to Seattle/Tacoma Intl per day from 12 different airlines.
What are the cheapest airlines flying from London Heathrow Airport to Seattle round-trip?
According to our current data, Icelandair (£418), Lufthansa (£448), and United Airlines (£450) offers the cheapest pricing from London Heathrow Airport to Seattle. Icelandair is priced at 33% lower than the current average price of a flight leaving 3 months from now.
What are the cheapest airlines to fly from London Heathrow Airport to Seattle one-way?
The cheapest airline one-way is Aer Lingus, with whom users have recently found tickets for as low as £402. However, be on the lookout for offers from WestJet and Icelandair, as they are both options that can get you from London Heathrow Airport to Seattle for a low price.
What are the most reliable airlines from London Heathrow Airport to Seattle?
Consider Singapore Airlines (89%), KLM (85%) or Air France (85%) when booking your flight. These represent the most reliable airlines when flying from London Heathrow Airport to Seattle.
What are the cheapest flights from London Heathrow Airport to Seattle?
The cheapest flight price from London Heathrow Airport to Seattle is £418. On average you can expect to pay £1,112. The most popular route, (London Heathrow - Seattle/Tacoma Intl), can usually be booked for £422.
Can I find deals for flights from Heathrow to Seattle that include hotel bookings?
Yes. In addition to deals on Heathrow to Seattle flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Heathrow to Seattle?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to Seattle.
Can I find deals for business class flights from Heathrow to Seattle?
Yes. Cheapflights offers flight deals from Heathrow to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from London Heathrow Airport to Seattle?
Currently, January is the cheapest month in which you can book a flight from London Heathrow Airport to Seattle (average of £622). Flying from London Heathrow Airport to Seattle in July is currently the most expensive (average of £946). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Tacoma

Leavenworth

Bothell

Browse thousands of different options on Cheapflights for your next trip

Top 10 airlines flying from Heathrow to Seattle

Airline	Cheapest	Average	Flexibility	On-time
Delta	Cheapest£371	Average£660	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
Icelandair	Cheapest£404	Average£546	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
Air France	Cheapest£414	Average£623	FlexibilityNo cancel fee	On-time77%	Search Air France flights
Lufthansa	Cheapest£429	Average£563	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
United Airlines	Cheapest£435	Average£693	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
KLM	Cheapest£442	Average£643	FlexibilityNo cancel fee	On-time75%	Search KLM flights
Aer Lingus	Cheapest£443	Average£696	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
Finnair	Cheapest£447	Average£621	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
Air Canada	Cheapest£447	Average£591	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
British Airways	Cheapest£467	Average£669	FlexibilityNo cancel fee	On-time70%	Search British Airways flights

Fly with Cheapflights

How does Cheapflights help users find flights from Heathrow to Seattle?

Deals for Heathrow to Seattle flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Heathrow to Seattle?

Cheapflights helps you find that perfect flight to Seattle from Heathrow by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Heathrow to Seattle with no change fees?

Need flexible booking options for your flight to Seattle from Heathrow? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from Heathrow to Seattle become cheaper?

Yes! Start tracking prices for Heathrow to Seattle flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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Cheap flights from London Heathrow Airport to Seattle from £399

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 13/4. Fares are subject to change and may not be available on all flights or dates of travel.

The best prices from London Heathrow to Seattle/Tacoma Intl are usually found in November or January, booked 54 days in advance, depart on a Tuesday or Wednesday and return on a Monday

Cheap flight deals from Heathrow to Seattle

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Heathrow to Seattle

Cheapest flights from Heathrow to SeattleExplore the most affordable flight options available from Heathrow to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 14 February 2025.

Explore the most affordable flight options available from Heathrow to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 14 February 2025.

Find flights from Heathrow to Seattle within your budget

Best time to book a flight from Heathrow to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Heathrow with our price prediction graph.

Travel insights for flights from Heathrow to Seattle

Get recent, data-driven insights about flights from Heathrow to Seattle including ideal travel times, pricing trends, and more.

How far ahead should I book a flight from London Heathrow Airport to Seattle?

Use this chart to determine the optimal time to book a return flight from Heathrow to Seattle. Price data was last updated on 7 February 2025.

What is the cheapest month to book a flight from London Heathrow Airport to Seattle?

What is the cheapest time of day to fly from LHR to SEA?

Find hourly flight availability from Heathrow to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 14 February 2025.

What is the cheapest day to fly from London Heathrow Airport to Seattle?

Use this chart to determine the cheapest time to fly return from Heathrow to Seattle. Price data was last updated on 10 February 2025.

Weekly flight availability from London Heathrow Airport to Seattle

Explore weekly flight availability from Heathrow to Seattle. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 14 February 2025.

Rainfall in Seattle by month

Plan your trip to Seattle by taking into account the average rainfall totals by month.

Temperature in Seattle by month

Plan your trip to Seattle by taking into account the average temperature totals by month.

Reviews of airlines servicing Seattle

Get a feel of what it's like to fly with Delta, KLM and Finnair from London to Seattle by reading reviews from past customers. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Heathrow to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What airport do you fly into for flights to Seattle from London Heathrow?

What are the cheapest airlines flying from London Heathrow Airport to Seattle round-trip?

What are the cheapest airlines to fly from London Heathrow Airport to Seattle one-way?

What are the most reliable airlines from London Heathrow Airport to Seattle?

What are the cheapest flights from London Heathrow Airport to Seattle?

Can I find deals for flights from Heathrow to Seattle that include hotel bookings?

How can I find direct flights from Heathrow to Seattle?

Can I find deals for business class flights from Heathrow to Seattle?

What is the cheapest month to book a flight from London Heathrow Airport to Seattle?

Travelling to a place near London Heathrow Airport?

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Fly from Heathrow to Seattle on these airlines

Choose from the following airlines for your flight from Heathrow to Seattle. Flights are based on user searches made on Cheapflights and were last updated on 14 February 2025.

Top 10 airlines flying from Heathrow to Seattle

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Cheapest flights from Heathrow to Seattle
Explore the most affordable flight options available from Heathrow to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 14 February 2025.