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

According to our current data, Lufthansa (£438), Virgin Atlantic (£439), and British Airways (£440) offers the cheapest pricing from London Heathrow Airport to Seattle. Lufthansa is priced at 31% 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 Icelandair, with whom users have recently found tickets for as low as £419. However, be on the lookout for offers from Aer Lingus and Finnair, 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 £435. On average you can expect to pay £2,062. The most popular route, (London Heathrow - Seattle/Tacoma Intl), can usually be booked for £365.

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

Consider KLM (74%), Air France (74%) or Delta (74%) 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 41% 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 £626.

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 £627 on average during January, but can be found for as low as £357.

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.

£417+ Flights from London Heathrow Airport to Seattle

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

Cheap flight deals from Heathrow to Seattle

Round-trip from	£438
One-way from	£417
Popular in	July
Cheapest in	February
Average price	£579

Lufthansa
17/2-7/3
2 total stops
33h 55m total
London to Seattle

Search Deals

23/1
2 total stops
41h 29m total
London to Seattle

Search Deals

High demand for flights, 15% potential price rise

Search Deals

Best time to find cheap flights, 2% potential price drop

Search Deals

Average for round-trip flights in January 2025

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 16 January 2025.

Wed 12/215:00LHR - SEA

Nonstop9h 55mBritish Airways

Thu 6/318:50SEA - LHR

Nonstop9h 25mBritish Airways

Deal found 15/1£438

Wed 22/115:00LHR - SEA

2 stops31h 30mMultiple Airlines

Wed 29/109:20SEA - LHR

2 stops16h 50mMultiple Airlines

Deal found 15/1£439

Mon 5/517:00LHR - SEA

Nonstop10h 35mDelta

Tue 11/1115:25SEA - LHR

Nonstop9h 55mDelta

Deal found 14/1£440

Wed 29/114:30LHR - SEA

2 stops27h 20mAir Canada

Wed 12/205:45SEA - LHR

2 stops17h 25mAir Canada

Deal found 15/1£441

Mon 3/311:35LHR - SEA

2 stops31h 37mUnited Airlines

Mon 17/305:15SEA - LHR

1 stop21h 25mUnited Airlines

Deal found 16/1£443

Sun 26/115:30LHR - SEA

1 stop28h 40mLufthansa

Tue 4/310:35SEA - LHR

2 stops14h 45mLufthansa

Deal found 16/1£443

Wed 5/313:15LHR - SEA

Nonstop10h 00mVirgin Atlantic

Sun 9/322:56SEA - LHR

1 stop14h 14mVirgin Atlantic

Deal found 16/1£446

Sun 4/513:35LHR - SEA

1 stop34h 25mAmerican Airlines

Mon 17/1101:24SEA - LHR

1 stop22h 51mAmerican Airlines

Deal found 15/1£447

Wed 21/521:25LHR - SEA

1 stop22h 00mIcelandair

Tue 3/615:45SEA - LHR

1 stop20h 35mIcelandair

Deal found 16/1£447

Sat 3/517:00LHR - SEA

Nonstop10h 35mAir France

Tue 9/1218:55SEA - LHR

Nonstop9h 45mAir France

Deal found 15/1£452

Thu 13/215:00LHR - SEA

Nonstop9h 55mFinnair

Wed 26/200:43SEA - LHR

1 stop21h 37mFinnair

Deal found 15/1£462

Fri 2/517:00LHR - SEA

Nonstop10h 35mKLM

Tue 18/1118:55SEA - LHR

Nonstop9h 45mKLM

Deal found 15/1£470

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 16 January 2025.

Mon 17/206:30LHR - SEA

1 stop13h 40mLufthansa

Fri 7/307:00SEA - LHR

1 stop20h 15mLufthansa

Deal found 15/1£438

Mon 3/219:35LHR - SEA

1 stop23h 45mVirgin Atlantic

Mon 17/217:45SEA - LHR

Nonstop9h 25mVirgin Atlantic

Deal found 15/1£439

Mon 5/509:50LHR - SEA

Nonstop9h 45mBritish Airways

Tue 11/1113:35SEA - LHR

Nonstop9h 25mBritish Airways

Deal found 14/1£440

Wed 29/114:30LHR - SEA

2 stops27h 20mAir Canada

Wed 12/205:45SEA - LHR

2 stops17h 25mAir Canada

Deal found 15/1£441

Mon 3/311:35LHR - SEA

2 stops31h 37mUnited Airlines

Mon 17/312:55SEA - LHR

1 stop13h 45mUnited Airlines

Deal found 15/1£443

Wed 5/213:15LHR - SEA

Nonstop10h 00mDelta

Wed 12/217:45SEA - LHR

Nonstop9h 25mDelta

Deal found 15/1£446

Sun 4/513:35LHR - SEA

1 stop34h 25mAmerican Airlines

Mon 17/1101:24SEA - LHR

1 stop22h 51mAmerican Airlines

Deal found 15/1£447

Mon 3/208:55LHR - SEA

2 stops21h 58mSWISS

Mon 10/215:25SEA - LHR

2 stops18h 25mSWISS

Deal found 15/1£447

Sat 3/517:00LHR - SEA

Nonstop10h 35mAir France

Mon 8/1218:55SEA - LHR

Nonstop9h 45mAir France

Deal found 15/1£452

Mon 3/315:00LHR - SEA

Nonstop9h 55mIberia

Wed 26/307:00SEA - LHR

1 stop16h 20mIberia

Deal found 15/1£453

Mon 3/306:00LHR - SEA

2 stops24h 42mMultiple Airlines

Mon 17/307:00SEA - LHR

1 stop17h 55mMultiple Airlines

Deal found 15/1£455

Wed 12/215:00LHR - SEA

Nonstop9h 55mFinnair

Tue 18/200:43SEA - LHR

1 stop21h 37mFinnair

Deal found 14/1£456

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 16 January 2025.

Wed 12/215:00LHR - SEA

Nonstop9h 55mBritish Airways

Thu 6/318:50SEA - LHR

Nonstop9h 25mBritish Airways

Deal found 15/1£438

Mon 3/313:15LHR - SEA

Nonstop10h 00mKLM

Mon 17/318:45SEA - LHR

Nonstop9h 25mKLM

Deal found 16/1£439

Mon 3/313:15LHR - SEA

Nonstop10h 00mDelta

Wed 26/318:45SEA - LHR

Nonstop9h 25mDelta

Deal found 15/1£445

Mon 3/315:00LHR - SEA

Nonstop9h 55mIberia

Mon 17/319:50SEA - LHR

Nonstop9h 25mIberia

Deal found 15/1£447

Mon 3/313:15LHR - SEA

Nonstop10h 00mMultiple Airlines

Mon 17/318:45SEA - LHR

Nonstop9h 25mMultiple Airlines

Deal found 15/1£448

Thu 13/212:40LHR - SEA

Nonstop10h 00mVirgin Atlantic

Thu 27/217:45SEA - LHR

Nonstop9h 25mVirgin Atlantic

Deal found 15/1£449

Sat 3/517:00LHR - SEA

Nonstop10h 35mAir France

Tue 9/1218:55SEA - LHR

Nonstop9h 45mAir France

Deal found 15/1£452

Mon 5/509:50LHR - SEA

Nonstop9h 45mFinnair

Thu 6/1118:50SEA - LHR

Nonstop9h 25mFinnair

Deal found 14/1£495

Thu 6/215:00LHR - SEA

Nonstop9h 55mAmerican Airlines

Sat 15/218:50SEA - LHR

Nonstop9h 25mAmerican Airlines

Deal found 15/1£548

Last-minute flights from Heathrow to Seattle
Discover last-minute flight deals from Heathrow to Seattle. Data last updated 16 January 2025 and is based on user searches.

Mon 20/120:25LHR - SEA

2 stops26h 20mVirgin Atlantic

Thu 23/107:10SEA - LHR

1 stop15h 15mVirgin Atlantic

Deal found 15/1£596

Tue 21/115:00LHR - SEA

Nonstop9h 55mBritish Airways

Tue 28/118:50SEA - LHR

Nonstop9h 25mBritish Airways

Deal found 14/1£449

Tue 21/109:25LHR - SEA

1 stop18h 39mFinnair

Tue 25/218:50SEA - LHR

Nonstop9h 25mFinnair

Deal found 15/1£465

Wed 22/115:00LHR - SEA

2 stops31h 30mMultiple Airlines

Wed 29/109:20SEA - LHR

2 stops16h 50mMultiple Airlines

Deal found 15/1£439

Wed 22/113:15LHR - SEA

Nonstop10h 00mDelta

Sun 23/223:05SEA - LHR

1 stop23h 45mDelta

Deal found 15/1£445

Wed 22/113:25LHR - SEA

2 stops16h 35mAir Canada

Tue 25/210:35SEA - LHR

2 stops14h 45mAir Canada

Deal found 15/1£453

Wed 22/108:20LHR - SEA

1 stop19h 44mAmerican Airlines

Wed 5/307:20SEA - LHR

2 stops15h 30mAmerican Airlines

Deal found 15/1£456

Wed 22/112:15LHR - SEA

1 stop12h 45mIcelandair

Sat 1/314:35SEA - LHR

1 stop12h 15mIcelandair

Deal found 15/1£569

Wed 22/110:05LHR - SEA

1 stop19h 13mAmerican Airlines

Tue 4/307:20SEA - LHR

2 stops15h 30mAmerican Airlines

Deal found 15/1£456

Thu 23/106:30LHR - SEA

1 stop13h 40mLufthansa

Wed 5/308:10SEA - LHR

1 stop14h 30mLufthansa

Deal found 15/1£440

Thu 23/120:25LHR - SEA

1 stop23h 26mKLM

Wed 5/318:55SEA - LHR

Nonstop9h 45mKLM

Deal found 15/1£443

Thu 23/115:00LHR - SEA

Nonstop9h 55mIberia

Tue 4/318:50SEA - LHR

Nonstop9h 25mIberia

Deal found 15/1£508

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 16 January 2025.

Thu 23/114:50LHR - SEA

2 stops41h 29mMultiple Airlines

Deal found 15/1£417

Fri 2/513:05LHR - SEA

1 stop12h 45mIcelandair

Deal found 15/1£419

Tue 15/409:50LHR - SEA

1 stop15h 09mAer Lingus

Deal found 15/1£427

Wed 29/115:00LHR - SEA

Nonstop9h 55mFinnair

Deal found 15/1£431

Wed 12/215:00LHR - SEA

Nonstop9h 55mBritish Airways

Deal found 15/1£437

Wed 22/114:50LHR - SEA

1 stop31h 31mWestJet

Deal found 15/1£441

Mon 17/215:00LHR - SEA

Nonstop9h 55mIberia

Deal found 15/1£452

Fri 14/307:40LHR - SEA

1 stop13h 40mLufthansa

Deal found 15/1£474

Wed 21/517:00LHR - SEA

Nonstop10h 35mKLM

Deal found 15/1£510

Mon 16/608:00LHR - SEA

3 stops34h 13mTAP AIR PORTUGAL

Deal found 15/1£733

Find flights from Heathrow to Seattle within your budget

Fly from

Fly to

Route

Depart

Return

Price

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 12/2

15:00-16:55

Nonstop9h 55m

Seattle/Tacoma Intl

Thu 6/3

18:50-12:15

Nonstop9h 25m

£438

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 3/2

19:35-11:20

1 stop23h 45m

Seattle/Tacoma Intl

Mon 17/2

17:45-11:10

Nonstop9h 25m

£439

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 29/1

14:30-09:50

2 stops27h 20m

Seattle/Tacoma Intl

Wed 12/2

05:45-07:10

2 stops17h 25m

£441

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 3/3

11:35-11:12

2 stops31h 37m

Seattle/Tacoma Intl

Mon 17/3

05:15-09:40

1 stop21h 25m

£443

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 26/1

15:30-12:10

1 stop28h 40m

Seattle/Tacoma Intl

Tue 4/3

10:35-09:20

2 stops14h 45m

£443

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 4/5

13:35-16:00

1 stop34h 25m

Seattle/Tacoma Intl

Sun 7/12

00:28-07:20

1 stop22h 52m

£447

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 21/5

21:25-11:25

1 stop22h 00m

Seattle/Tacoma Intl

Mon 2/6

15:45-11:55

1 stop12h 10m

£447

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 3/5

17:00-19:35

Nonstop10h 35m

Seattle/Tacoma Intl

Tue 9/12

18:55-12:40

Nonstop9h 45m

£452

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 3/3

15:00-16:55

Nonstop9h 55m

Seattle/Tacoma Intl

Wed 26/3

07:00-06:20

1 stop16h 20m

£453

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 3/3

06:00-22:42

2 stops24h 42m

Seattle/Tacoma Intl

Mon 17/3

07:00-07:55

1 stop17h 55m

£455

Flights are sorted by cheapest return flights first.

Deals found on 15/1

Showing 1-10 of 24 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 13% on the flight price compared to flying in the afternoon, 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 at midday 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 Wednesday (16 on average). You will have fewer flight options on Monday, 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 Finnair, Delta and British Airways 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

8,511 reviews

Check prices

Reviews

1 / 10

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

Delta

8.0

Very Good

8,511 reviews

Delta

8.0

Very Good

8,511 reviews

Check prices

Reviews

1 / 10

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

KLM

7.8

Good

1,339 reviews

Delta

8.0

Very Good

8,511 reviews

Check prices

Reviews

1 / 10

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

Finnair

7.6

Good

1,285 reviews

Delta

8.0

Very Good

8,511 reviews

Check prices

Reviews

1 / 10

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

SWISS

7.5

Good

1,598 reviews

Delta

8.0

Very Good

8,511 reviews

Check prices

Reviews

1 / 10

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

Virgin Atlantic

7.5

Good

664 reviews

Delta

8.0

Very Good

8,511 reviews

Check prices

Reviews

1 / 10

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, Lufthansa (£438), Virgin Atlantic (£439), and British Airways (£440) offers the cheapest pricing from London Heathrow Airport to Seattle. Lufthansa is priced at 31% 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 Icelandair, with whom users have recently found tickets for as low as £419. However, be on the lookout for offers from Aer Lingus and Finnair, 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 KLM (74%), Air France (74%) or Delta (74%) 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 £435. On average you can expect to pay £2,062. The most popular route, (London Heathrow - Seattle/Tacoma Intl), can usually be booked for £365.
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£324	Average£675	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
Icelandair	Cheapest£427	Average£561	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
United Airlines	Cheapest£438	Average£691	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Lufthansa	Cheapest£438	Average£581	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
Aer Lingus	Cheapest£453	Average£712	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
Air France	Cheapest£456	Average£643	FlexibilityNo cancel fee	On-time77%	Search Air France flights
Air Canada	Cheapest£457	Average£602	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
British Airways	Cheapest£465	Average£664	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Finnair	Cheapest£471	Average£638	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
KLM	Cheapest£480	Average£665	FlexibilityNo cancel fee	On-time75%	Search KLM 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 £417

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 23/1. 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 February or April, booked 54 days in advance, depart on a Wednesday or Tuesday and return on a Wednesday

Cheap flight deals from Heathrow to Seattle

Round-trip from

One-way from

Popular in

Cheapest in

Average price

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 16 January 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 16 January 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 10 January 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 16 January 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 16 December 2024.

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 16 January 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 Finnair, Delta and British Airways 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 16 January 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 16 January 2025.