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

Icelandair, at £415, was found to be the cheapest airline from London to Seattle.Alternate airlines flying return to your destination include Lufthansa and Air Canada. Icelandair 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 to Seattle one-way?

£383 is the cheapest one-way deal found within the past few days, from WestJet. You may also be able to find cheap deals on Aer Lingus and Icelandair, with prices starting from £417 and £446, respectively.

What are the most popular routes from London to Seattle?

When deciding which route to take from London to Seattle consider London Heathrow - Seattle/Tacoma Intl, London Gatwick - Seattle/Tacoma Intl or London City - Seattle/Tacoma Intl as they are the most popular.

What are the cheapest flights from London to Seattle?

On average you can expect to pay £1,268 for a flight from London to Seattle. The cheapest flight overall is £418 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £410.

What are the most reliable airlines from London to Seattle?

Consider Singapore Airlines (97%), KLM (89%) or Air France (89%) when booking your flight. These represent the most reliable airlines when flying from London to Seattle.

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

Before booking your flight from London to Seattle check out the most popular airlines for this route: Air Canada, Air France or Finnair.

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

Leaving on a Monday is a viable option for saving on travel. Heavily demanded days of the week can typically drive up the prices you see. Booking your travel for a less competitive day can save up to 15% on the overall cost on flights from London to Seattle.

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

Travelers have found it’s best to book a flight 44 days in advance to save up to 37% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 44 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from London to Seattle 1-2 weeks in advance for as low as £605, or £863 for flights within the next 24 hours.

What is the cheapest month to fly from London 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 in January are about £609 on average during January, but can be found for as low as £346.

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

Located just 11.4 mi from the city center, Seattle/Tacoma Intl is the airport most travelers will use when flying to Seattle from London. Booking flights from London to Seattle/Tacoma Intl (SEA) should be relatively easy as there are 15 daily inbound flights from London from 12 different airlines.

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

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

How can I find direct flights from London to Seattle?

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

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

Yes. Cheapflights offers flight deals from London 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.

£381+ Flights from London to Seattle

The best prices from London to Seattle/Tacoma Intl are usually found in January or February, booked 69 days in advance, depart on a Tuesday or Wednesday and return on a Monday

Cheap flight deals from London to Seattle

Round-trip from	£415
One-way from	£381
Popular in	August
Cheapest in	January
Average price	£524
Good round-trip deal	£529 or less
Good one-way deal	£585 or less

Icelandair
22/4-29/4
2 total stops
49h 00m total
London to Seattle

Search Deals

2/3
3 total stops
49h 25m total
London to Seattle

Search Deals

Highest demand for flights based on searches. 15% potential increase in price (£87 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease (£15 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 (LON) to Seattle/Tacoma Intl.

Search Deals

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

Search Deals

Find flight deals from London to Seattle

Cheapest flights from London to Seattle
Explore the most affordable flight options available from London to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 23 February 2025.

Tue 22/421:25LHR - SEA

1 stop31h 15mIcelandair

Tue 29/415:45SEA - LHR

1 stop12h 10mIcelandair

Deal found 22/2£417

Tue 18/1111:55LGW - SEA

1 stop13h 05mIcelandair

Wed 26/1114:35SEA - LGW

1 stop12h 20mIcelandair

Deal found 22/2£418

Tue 25/306:35LHR - SEA

1 stop14h 45mLufthansa

Tue 1/414:18SEA - LHR

1 stop13h 27mLufthansa

Deal found 22/2£453

Mon 17/308:55LHR - SEA

2 stops19h 35mAir Canada

Mon 31/310:35SEA - LHR

2 stops15h 25mAir Canada

Deal found 22/2£454

Tue 25/306:30LHR - SEA

1 stop13h 10mKLM

Tue 1/420:20SEA - LHR

Nonstop9h 55mKLM

Deal found 22/2£457

Tue 25/313:15LHR - SEA

Nonstop10h 00mVirgin Atlantic

Tue 1/420:20SEA - LHR

Nonstop9h 55mVirgin Atlantic

Deal found 22/2£460

Wed 26/310:40LHR - SEA

2 stops18h 25mFinnair

Wed 2/406:10SEA - LHR

1 stop17h 50mFinnair

Deal found 22/2£464

Sun 9/307:40LHR - SEA

1 stop13h 40mUnited Airlines

Sun 16/305:00SEA - LHR

1 stop19h 25mUnited Airlines

Deal found 22/2£467

Sat 8/313:00LHR - SEA

1 stop13h 25mMultiple Airlines

Sat 15/319:34SEA - LHR

1 stop33h 26mMultiple Airlines

Deal found 22/2£477

Mon 21/417:25LHR - SEA

Nonstop10h 20mAir France

Tue 29/407:35SEA - LHR

1 stop15h 10mAir France

Deal found 22/2£483

Mon 17/306:30LHR - SEA

1 stop13h 10mDelta

Mon 31/320:20SEA - LHR

Nonstop9h 55mDelta

Deal found 22/2£487

Tue 22/410:40LGW - SEA

2 stops20h 24mAmerican Airlines

Tue 29/405:22SEA - LGW

2 stops18h 48mAmerican Airlines

Deal found 23/2£493

Best flights from London to Seattle
Discover carefully curated flight deals from London to Seattle that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 23 February 2025.

Tue 22/421:25LHR - SEA

1 stop28h 25mIcelandair

Tue 29/415:45SEA - LHR

1 stop20h 35mIcelandair

Deal found 23/2£415

Mon 17/320:15LHR - SEA

1 stop25h 05mLufthansa

Mon 31/315:05SEA - LHR

1 stop14h 15mLufthansa

Deal found 23/2£449

Mon 17/308:55LHR - SEA

2 stops19h 35mAir Canada

Mon 31/310:35SEA - LHR

2 stops15h 25mAir Canada

Deal found 22/2£454

Tue 25/306:30LHR - SEA

1 stop13h 10mKLM

Tue 1/420:20SEA - LHR

Nonstop9h 55mKLM

Deal found 22/2£457

Tue 25/313:15LHR - SEA

Nonstop10h 00mVirgin Atlantic

Tue 1/420:20SEA - LHR

Nonstop9h 55mVirgin Atlantic

Deal found 22/2£460

Wed 26/310:40LHR - SEA

2 stops18h 25mFinnair

Wed 2/406:10SEA - LHR

1 stop17h 50mFinnair

Deal found 22/2£464

Sun 9/307:40LHR - SEA

1 stop13h 40mUnited Airlines

Sun 16/305:00SEA - LHR

1 stop19h 25mUnited Airlines

Deal found 22/2£467

Sat 26/414:10LHR - SEA

1 stop12h 18mMultiple Airlines

Sat 3/505:40SEA - LHR

2 stops20h 20mMultiple Airlines

Deal found 23/2£474

Mon 21/417:25LHR - SEA

Nonstop10h 20mAir France

Tue 29/407:35SEA - LHR

1 stop15h 10mAir France

Deal found 22/2£483

Mon 17/306:30LHR - SEA

1 stop13h 10mDelta

Mon 31/320:20SEA - LHR

Nonstop9h 55mDelta

Deal found 22/2£487

Mon 17/313:50LHR - SEA

1 stop16h 17mIberia

Mon 31/313:30SEA - LHR

Nonstop9h 20mIberia

Deal found 22/2£512

Sat 8/309:25LHR - SEA

Nonstop9h 55mBritish Airways

Tue 11/314:35SEA - LHR

Nonstop9h 25mBritish Airways

Deal found 22/2£517

Direct flights from London to Seattle
Explore direct flight options from London to Seattle based on user searches, and compare prices and availability for your desired travel dates. Data last updated 23 February 2025.

Tue 25/313:15LHR - SEA

Nonstop10h 00mVirgin Atlantic

Tue 1/420:20SEA - LHR

Nonstop9h 55mVirgin Atlantic

Deal found 22/2£460

Tue 25/313:15LHR - SEA

Nonstop10h 00mKLM

Mon 31/320:20SEA - LHR

Nonstop9h 55mKLM

Deal found 22/2£473

Tue 22/409:25LHR - SEA

Nonstop9h 45mFinnair

Tue 29/413:30SEA - LHR

Nonstop9h 20mFinnair

Deal found 22/2£486

Tue 22/409:25LHR - SEA

Nonstop9h 45mIberia

Wed 30/413:30SEA - LHR

Nonstop9h 20mIberia

Deal found 22/2£487

Mon 17/313:15LHR - SEA

Nonstop10h 00mMultiple Airlines

Mon 31/320:20SEA - LHR

Nonstop9h 55mMultiple Airlines

Deal found 22/2£494

Mon 17/313:15LHR - SEA

Nonstop10h 00mDelta

Mon 31/317:35SEA - LHR

Nonstop9h 50mDelta

Deal found 23/2£502

Sat 8/309:25LHR - SEA

Nonstop9h 55mBritish Airways

Tue 11/314:35SEA - LHR

Nonstop9h 25mBritish Airways

Deal found 22/2£517

Mon 12/517:25LHR - SEA

Nonstop10h 20mAir France

Fri 23/520:20SEA - LHR

Nonstop9h 55mAir France

Deal found 22/2£564

Sat 8/309:25LHR - SEA

Nonstop9h 55mAmerican Airlines

Sat 15/319:50SEA - LHR

Nonstop9h 25mAmerican Airlines

Deal found 22/2£620

Last-minute flights from London to Seattle
Discover last-minute flight deals from London to Seattle. Data last updated 23 February 2025 and is based on user searches.

Sat 1/313:05LHR - SEA

Nonstop10h 00mDelta

Wed 29/1016:25SEA - LHR

Nonstop9h 55mDelta

Deal found 22/2£587

Sun 2/306:50LHR - SEA

2 stops21h 29mUnited Airlines

Sun 16/305:00SEA - LHR

1 stop19h 25mUnited Airlines

Deal found 22/2£475

Sun 2/320:25LHR - SEA

1 stop23h 12mKLM

Sun 16/319:55SEA - LHR

Nonstop9h 45mKLM

Deal found 22/2£514

Sun 2/309:50LHR - SEA

1 stop16h 25mAer Lingus

Mon 3/320:00SEA - LHR

1 stop17h 00mAer Lingus

Deal found 22/2£559

Mon 3/314:30LHR - SEA

2 stops27h 20mAir Canada

Thu 13/306:05SEA - LHR

2 stops18h 05mAir Canada

Deal found 22/2£501

Mon 3/315:00LHR - SEA

Nonstop9h 55mBritish Airways

Thu 13/316:59SEA - LHR

1 stop16h 01mBritish Airways

Deal found 22/2£558

Tue 4/313:15LHR - SEA

Nonstop10h 00mVirgin Atlantic

Sat 8/322:40SEA - LHR

1 stop25h 15mVirgin Atlantic

Deal found 23/2£506

Tue 4/310:40LHR - SEA

1 stop16h 25mFinnair

Sat 8/321:16SEA - LHR

2 stops16h 54mFinnair

Deal found 23/2£517

Wed 5/311:55LGW - SEA

1 stop13h 05mIcelandair

Wed 12/315:35SEA - LGW

1 stop12h 20mIcelandair

Deal found 22/2£426

Wed 5/312:15LHR - SEA

1 stop12h 45mIcelandair

Wed 12/315:35SEA - LHR

1 stop12h 15mIcelandair

Deal found 22/2£463

Wed 5/308:50LGW - SEA

2 stops33h 50mMultiple Airlines

Wed 12/321:00SEA - LGW

1 stop17h 05mMultiple Airlines

Deal found 22/2£501

Wed 5/318:45LGW - SEA

2 stops36h 08mSWISS

Wed 12/314:50SEA - LGW

2 stops20h 00mSWISS

Deal found 22/2£586

One-way flights from London to Seattle
Search for one-way flight options from London to Seattle. Find affordable one-way fares based on user searches. Data last updated 23 February 2025.

Sun 2/307:00LGW - SEA

3 stops49h 25mMultiple Airlines

Deal found 22/2£381

Tue 1/414:10LHR - SEA

1 stop32h 11mWestJet

Deal found 21/2£383

Sun 9/314:50LHR - SEA

2 stops26h 00mMultiple Airlines

Deal found 22/2£387

Thu 27/318:25STN - SEA

2 stops47h 14mMultiple Airlines

Deal found 22/2£391

Thu 27/317:50LTN - SEA

2 stops47h 49mMultiple Airlines

Deal found 22/2£396

Fri 28/207:50LHR - SEA

1 stop18h 25mAer Lingus

Deal found 21/2£417

Thu 19/610:45LGW - SEA

2 stops33h 46mWestJet

Deal found 22/2£441

Tue 22/421:25LHR - SEA

1 stop28h 25mIcelandair

Deal found 23/2£446

Thu 27/317:00LCY - SEA

1 stop28h 25mMultiple Airlines

Deal found 22/2£503

Mon 21/409:50LHR - SEA

Nonstop9h 45mIberia

Deal found 23/2£510

Wed 9/715:40LGW - SEA

1 stop13h 00mIcelandair

Deal found 22/2£516

Sun 27/409:45LHR - SEA

Nonstop9h 45mFinnair

Deal found 22/2£539

Find flights from London to Seattle within your budget

Fly from

Fly to

Route

Depart

Return

Price

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 22/4

21:25-20:40

1 stop31h 15m

Seattle/Tacoma Intl

Tue 29/4

15:45-11:55

1 stop12h 10m

£417

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Wed 5/3

11:55-17:00

1 stop13h 05m

Seattle/Tacoma Intl

Wed 12/3

15:35-10:55

1 stop12h 20m

£426

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 25/3

06:35-14:20

1 stop14h 45m

Seattle/Tacoma Intl

Tue 1/4

14:18-11:45

1 stop13h 27m

£453

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 17/3

08:55-21:30

2 stops19h 35m

Seattle/Tacoma Intl

Mon 31/3

10:35-10:00

2 stops15h 25m

£454

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 25/3

06:30-12:40

1 stop13h 10m

Seattle/Tacoma Intl

Tue 1/4

20:20-14:15

Nonstop9h 55m

£457

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 25/3

13:15-16:15

Nonstop10h 00m

Seattle/Tacoma Intl

Tue 1/4

20:20-14:15

Nonstop9h 55m

£460

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 26/3

10:40-22:05

2 stops18h 25m

Seattle/Tacoma Intl

Wed 2/4

06:10-08:00

1 stop17h 50m

£464

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 9/3

07:40-13:20

1 stop13h 40m

Seattle/Tacoma Intl

Sun 16/3

05:00-07:25

1 stop19h 25m

£467

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 8/3

13:00-18:25

1 stop13h 25m

Seattle/Tacoma Intl

Sat 15/3

19:34-12:00

1 stop33h 26m

£477

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 21/4

17:25-19:45

Nonstop10h 20m

Seattle/Tacoma Intl

Tue 29/4

07:35-06:45

1 stop15h 10m

£483

Flights are sorted by cheapest return flights first.

Deals found on 22/2

Showing 1-10 of 58 results

...

Best time to book a flight from London to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from London 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 London to Seattle

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

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

Booking 69 days in advance of your planned departure date is, on average, the best time to get cheap flights from London to Seattle. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, January is the cheapest month in which you can book a flight from London to Seattle (average of £622). Flying from London 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 LON to SEA?

Unlike in the morning, when flights are generally more expensive, you can save up to 22% on flights from London to Seattle by exploring options for tickets in the evening.

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

Travellers seeking maximum savings on their London 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 to Seattle

The most flights from LON to SEA are scheduled on a Friday (21 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (11 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

Read through reviews of airlines operating flights from London to Seattle, such as Delta, KLM and Finnair. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very Good

8,187 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

8,187 reviews

Delta

8.0

Very Good

8,187 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

1,333 reviews

Delta

8.0

Very Good

8,187 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

1,271 reviews

Delta

8.0

Very Good

8,187 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

Austrian Airlines

7.5

Good

771 reviews

Delta

8.0

Very Good

8,187 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

1,568 reviews

Delta

8.0

Very Good

8,187 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?
Located just 11.4 mi from the city center, Seattle/Tacoma Intl is the airport most travelers will use when flying to Seattle from London. Booking flights from London to Seattle/Tacoma Intl (SEA) should be relatively easy as there are 15 daily inbound flights from London from 12 different airlines.
What are the cheapest airlines flying from London to Seattle round-trip?
Icelandair, at £415, was found to be the cheapest airline from London to Seattle.Alternate airlines flying return to your destination include Lufthansa and Air Canada. Icelandair 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 to Seattle one-way?
£383 is the cheapest one-way deal found within the past few days, from WestJet. You may also be able to find cheap deals on Aer Lingus and Icelandair, with prices starting from £417 and £446, respectively.
What are the most popular routes from London to Seattle?
When deciding which route to take from London to Seattle consider London Heathrow - Seattle/Tacoma Intl, London Gatwick - Seattle/Tacoma Intl or London City - Seattle/Tacoma Intl as they are the most popular.
What are the most reliable airlines from London to Seattle?
Consider Singapore Airlines (97%), KLM (89%) or Air France (89%) when booking your flight. These represent the most reliable airlines when flying from London to Seattle.
What are the cheapest flights from London to Seattle?
On average you can expect to pay £1,268 for a flight from London to Seattle. The cheapest flight overall is £418 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £410.
Can I find deals for flights from London to Seattle that include hotel bookings?
Yes. In addition to deals on London to Seattle flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from London to Seattle?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Seattle.
Can I find deals for business class flights from London to Seattle?
Yes. Cheapflights offers flight deals from London 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 to Seattle?
Currently, January is the cheapest month in which you can book a flight from London to Seattle (average of £622). Flying from London 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 London to Seattle

Airline	Cheapest	Average	Flexibility	On-time
Icelandair	Cheapest£346	Average£543	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
Delta	Cheapest£367	Average£653	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
Air France	Cheapest£409	Average£617	FlexibilityNo cancel fee	On-time77%	Search Air France flights
Lufthansa	Cheapest£424	Average£557	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
United Airlines	Cheapest£431	Average£686	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
KLM	Cheapest£437	Average£638	FlexibilityNo cancel fee	On-time75%	Search KLM flights
Aer Lingus	Cheapest£438	Average£689	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
Finnair	Cheapest£441	Average£616	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
Air Canada	Cheapest£443	Average£591	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
British Airways	Cheapest£460	Average£606	FlexibilityNo cancel fee	On-time70%	Search British Airways flights

Fly with Cheapflights

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

Cheapflights makes it easy to find London to Seattle flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

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

Millions of users choose and trust Cheapflights to book the best flight deals from London to Seattle for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

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

Certainly. Search results for flights to Seattle from London shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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

Yes, Cheapflights offers price alerts on London to Seattle flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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Cheap flights from London to Seattle from £381

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 2/3. Fares are subject to change and may not be available on all flights or dates of travel.

The best prices from London to Seattle/Tacoma Intl are usually found in January or February, booked 69 days in advance, depart on a Tuesday or Wednesday and return on a Monday

Cheap flight deals from London 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 London to Seattle

Cheapest flights from London to SeattleExplore the most affordable flight options available from London to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 23 February 2025.

Explore the most affordable flight options available from London to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 23 February 2025.

Find flights from London to Seattle within your budget

Best time to book a flight from London to Seattle

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

Travel insights for flights from London to Seattle

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

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

Use this chart to determine the optimal time to book a return flight from London to Seattle. Price data was last updated on 14 February 2025.

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

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

Find hourly flight availability from London 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 23 February 2025.

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

Use this chart to determine the cheapest time to fly return from London to Seattle. Price data was last updated on 16 December 2024.

Weekly flight availability from London to Seattle

Explore weekly flight availability from London 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 23 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

Read through reviews of airlines operating flights from London to Seattle, such as Delta, KLM and Finnair. Users can see the overall rating for each airline as well as how each is rated 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 London 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?

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

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

What are the most popular routes from London to Seattle?

What are the most reliable airlines from London to Seattle?

What are the cheapest flights from London to Seattle?

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

How can I find direct flights from London to Seattle?

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

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

Travelling to a place near London?

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Fly from London to Seattle on these airlines

Choose from the following airlines for your flight from London to Seattle. Flights are based on user searches made on Cheapflights and were last updated on 23 February 2025.

Top 10 airlines flying from London to Seattle

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Cheapest flights from London to Seattle
Explore the most affordable flight options available from London to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 23 February 2025.