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

Icelandair, at £429, was found to be the cheapest airline from London to Seattle.Alternate airlines flying return to your destination include Lufthansa and Finnair. Icelandair is priced at 26% 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?

£401 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 Lufthansa, with prices starting from £403 and £477, 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 £1,491 for a flight from London to Seattle. The cheapest flight overall is £474 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £369.

What are the most reliable airlines from London to Seattle?

Consider Singapore Airlines (96%), Aeromexico (91%) or KLM (91%) 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 20% 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 40% 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 £593, or £800 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 £581 on average during January, but can be found for as low as £331.

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 19 daily inbound flights from London from 13 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.

£326+ Flights from London to Seattle

Cheapflights Tip: The best prices from London to Seattle/Tacoma Intl are usually found in January or March, 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	£429
One-way from	£326
Popular in	August
Cheapest in	January
Average price	£536
Good round-trip deal	£549 or less
Good one-way deal	£629 or less

Icelandair
28/4-13/5
2 total stops
51h 50m total
London to Seattle

Search Deals

27/5
2 total stops
48h 41m total
London to Seattle

Search Deals

Highest demand for flights based on searches. 16% potential increase in price (£84 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease (£14 potential savings vs. average return price).

Search Deals

Average for round-trip flights in April 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 16 April 2025.

Mon 28/421:25LHR - SEA

1 stop31h 15mIcelandair

Tue 13/515:45SEA - LHR

1 stop20h 35mIcelandair

Deal found 15/4£429

Mon 12/515:40LGW - SEA

1 stop34h 10mIcelandair

Fri 16/519:00SEA - LGW

1 stop32h 45mIcelandair

Deal found 15/4£434

Thu 1/506:30LHR - SEA

1 stop13h 55mLufthansa

Thu 8/507:00SEA - LHR

1 stop17h 20mLufthansa

Deal found 15/4£451

Fri 9/507:25LHR - SEA

1 stop17h 34mMultiple Airlines

Sat 17/507:20SEA - LHR

1 stop18h 40mMultiple Airlines

Deal found 15/4£454

Tue 6/511:00LHR - SEA

1 stop16h 36mFinnair

Tue 13/523:58SEA - LHR

2 stops25h 52mFinnair

Deal found 15/4£455

Tue 6/508:45LHR - SEA

2 stops18h 52mAir Canada

Tue 13/507:20SEA - LHR

1 stop15h 10mAir Canada

Deal found 15/4£458

Fri 30/506:40LHR - SEA

1 stop15h 10mScandinavian Airlines

Fri 6/616:00SEA - LHR

1 stop16h 00mScandinavian Airlines

Deal found 14/4£459

Tue 6/521:15STN - SEA

2 stops25h 50mMultiple Airlines

Sun 11/517:05SEA - STN

2 stops21h 35mMultiple Airlines

Deal found 15/4£461

Wed 30/410:50LHR - SEA

1 stop14h 09mUnited Airlines

Wed 7/508:10SEA - LHR

1 stop14h 45mUnited Airlines

Deal found 15/4£463

Tue 6/517:00LGW - SEA

2 stops30h 05mMultiple Airlines

Sun 11/517:05SEA - LGW

2 stops21h 05mMultiple Airlines

Deal found 15/4£466

Mon 5/506:20LHR - SEA

1 stop18h 39mBritish Airways

Mon 12/520:20SEA - LHR

Nonstop9h 20mBritish Airways

Deal found 14/4£466

Wed 30/408:40LHR - SEA

2 stops20h 35mSWISS

Wed 7/514:40SEA - LHR

2 stops36h 45mSWISS

Deal found 15/4£467

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 16 April 2025.

Mon 28/421:25LHR - SEA

1 stop31h 15mIcelandair

Tue 13/515:45SEA - LHR

1 stop20h 35mIcelandair

Deal found 15/4£429

Thu 1/506:30LHR - SEA

1 stop13h 55mLufthansa

Thu 8/507:00SEA - LHR

1 stop17h 20mLufthansa

Deal found 15/4£451

Fri 9/507:25LHR - SEA

1 stop17h 34mMultiple Airlines

Sat 17/507:20SEA - LHR

1 stop18h 40mMultiple Airlines

Deal found 15/4£454

Tue 6/511:00LHR - SEA

1 stop16h 36mFinnair

Tue 13/523:58SEA - LHR

2 stops25h 52mFinnair

Deal found 15/4£455

Tue 6/508:45LHR - SEA

2 stops18h 52mAir Canada

Tue 13/507:20SEA - LHR

1 stop15h 10mAir Canada

Deal found 15/4£458

Fri 30/506:40LHR - SEA

1 stop15h 10mScandinavian Airlines

Fri 6/616:00SEA - LHR

1 stop16h 00mScandinavian Airlines

Deal found 14/4£459

Mon 28/406:20LHR - SEA

1 stop18h 39mBritish Airways

Mon 5/513:30SEA - LHR

Nonstop9h 20mBritish Airways

Deal found 15/4£461

Wed 30/410:50LHR - SEA

1 stop14h 09mUnited Airlines

Wed 7/508:10SEA - LHR

1 stop14h 45mUnited Airlines

Deal found 15/4£463

Wed 30/408:40LHR - SEA

2 stops20h 35mSWISS

Wed 7/514:40SEA - LHR

2 stops36h 45mSWISS

Deal found 15/4£467

Mon 28/419:45LHR - SEA

1 stop23h 30mVirgin Atlantic

Tue 13/517:35SEA - LHR

Nonstop9h 45mVirgin Atlantic

Deal found 15/4£469

Mon 28/411:30LHR - SEA

1 stop14h 10mAir France

Tue 13/520:20SEA - LHR

Nonstop9h 55mAir France

Deal found 15/4£473

Mon 28/406:30LHR - SEA

1 stop13h 15mKLM

Tue 13/520:20SEA - LHR

Nonstop9h 55mKLM

Deal found 15/4£485

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 16 April 2025.

Mon 28/413:25LHR - SEA

Nonstop10h 20mVirgin Atlantic

Tue 13/517:35SEA - LHR

Nonstop9h 45mVirgin Atlantic

Deal found 15/4£471

Mon 28/417:25LHR - SEA

Nonstop10h 20mAir France

Mon 5/520:20SEA - LHR

Nonstop9h 55mAir France

Deal found 15/4£479

Wed 30/416:30LHR - SEA

Nonstop9h 50mBritish Airways

Wed 7/520:20SEA - LHR

Nonstop9h 20mBritish Airways

Deal found 15/4£481

Wed 30/417:25LHR - SEA

Nonstop10h 20mKLM

Wed 7/520:20SEA - LHR

Nonstop9h 55mKLM

Deal found 15/4£494

Mon 28/417:25LHR - SEA

Nonstop10h 20mDelta

Tue 13/517:35SEA - LHR

Nonstop9h 45mDelta

Deal found 15/4£500

Sat 30/816:30LHR - SEA

Nonstop9h 50mAmerican Airlines

Tue 9/913:30SEA - LHR

Nonstop9h 20mAmerican Airlines

Deal found 15/4£570

Fri 30/513:25LHR - SEA

Nonstop10h 20mMultiple Airlines

Fri 6/617:35SEA - LHR

Nonstop9h 45mMultiple Airlines

Deal found 15/4£580

Thu 4/909:50LHR - SEA

Nonstop9h 45mFinnair

Tue 16/913:30SEA - LHR

Nonstop9h 20mFinnair

Deal found 15/4£580

Tue 26/816:30LHR - SEA

Nonstop9h 50mIberia

Wed 10/913:30SEA - LHR

Nonstop9h 20mIberia

Deal found 15/4£603

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

Mon 21/421:25LHR - SEA

1 stop31h 15mIcelandair

Mon 28/419:00SEA - LHR

1 stop32h 55mIcelandair

Deal found 14/4£455

Tue 22/408:15LHR - SEA

1 stop16h 44mBritish Airways

Wed 30/420:20SEA - LHR

Nonstop9h 20mBritish Airways

Deal found 15/4£480

Tue 22/417:15LHR - SEA

2 stops27h 28mFinnair

Fri 2/522:05SEA - LHR

2 stops24h 35mFinnair

Deal found 15/4£489

Tue 22/408:40LHR - SEA

1 stop15h 20mKLM

Wed 14/520:20SEA - LHR

Nonstop9h 55mKLM

Deal found 15/4£491

Tue 22/417:25LHR - SEA

Nonstop10h 20mAir France

Wed 30/420:20SEA - LHR

Nonstop9h 55mAir France

Deal found 15/4£499

Thu 24/414:10LHR - SEA

1 stop12h 18mLufthansa

Wed 30/414:18SEA - LHR

1 stop13h 27mLufthansa

Deal found 15/4£468

Thu 24/414:00LGW - SEA

2 stops34h 43mMultiple Airlines

Sat 10/516:20SEA - LGW

1 stop34h 35mMultiple Airlines

Deal found 15/4£468

Thu 24/414:10LHR - SEA

1 stop12h 18mMultiple Airlines

Wed 30/408:15SEA - LHR

1 stop14h 40mMultiple Airlines

Deal found 15/4£468

Thu 24/415:40LGW - SEA

1 stop13h 00mIcelandair

Wed 30/419:00SEA - LGW

1 stop11h 40mIcelandair

Deal found 15/4£469

Thu 24/409:30LHR - SEA

2 stops21h 30mUnited Airlines

Sat 10/507:00SEA - LHR

2 stops19h 00mUnited Airlines

Deal found 16/4£471

Thu 24/414:10LHR - SEA

1 stop27h 43mAir Canada

Sat 10/507:20SEA - LHR

1 stop15h 10mAir Canada

Deal found 15/4£474

Thu 24/417:25LHR - SEA

Nonstop10h 20mVirgin Atlantic

Wed 30/417:35SEA - LHR

Nonstop9h 45mVirgin Atlantic

Deal found 15/4£492

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 16 April 2025.

Tue 27/519:05LTN - SEA

2 stops48h 41mMultiple Airlines

Deal found 15/4£326

Tue 29/715:05LHR - SEA

3 stops29h 53mMultiple Airlines

Deal found 15/4£392

Tue 13/514:10LHR - SEA

1 stop13h 00mWestJet

Deal found 15/4£401

Mon 30/606:25LGW - SEA

3 stops44h 13mMultiple Airlines

Deal found 15/4£402

Mon 25/820:10LHR - SEA

1 stop28h 49mAer Lingus

Deal found 15/4£403

Mon 30/608:05STN - SEA

3 stops42h 33mMultiple Airlines

Deal found 15/4£409

Thu 8/506:45LCY - SEA

2 stops20h 14mMultiple Airlines

Deal found 15/4£412

Tue 17/617:50LHR - SEA

1 stop31h 09mLufthansa

Deal found 14/4£477

Fri 9/519:10LCY - SEA

1 stop25h 15mLufthansa

Deal found 15/4£484

Wed 18/610:20LHR - SEA

1 stop13h 40mFinnair

Deal found 14/4£493

Tue 27/510:45LGW - SEA

2 stops40h 25mWestJet

Deal found 15/4£498

Wed 14/516:30LHR - SEA

Nonstop9h 50mBritish Airways

Deal found 15/4£514

Cheapflights Fare Finder

Use the filters below to find and compare flights from London to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 28/4

21:25-20:40

1 stop31h 15m

Seattle/Tacoma Intl

Tue 13/5

15:45-20:20

1 stop20h 35m

£429

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Mon 12/5

15:40-17:50

1 stop34h 10m

Seattle/Tacoma Intl

Fri 16/5

19:00-11:45

1 stop32h 45m

£434

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 1/5

06:30-12:25

1 stop13h 55m

Seattle/Tacoma Intl

Thu 8/5

07:00-08:20

1 stop17h 20m

£451

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 9/5

07:25-16:59

1 stop17h 34m

Seattle/Tacoma Intl

Sat 17/5

07:20-10:00

1 stop18h 40m

£454

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 6/5

11:00-19:36

1 stop16h 36m

Seattle/Tacoma Intl

Tue 13/5

23:58-09:50

2 stops25h 52m

£455

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 6/5

08:45-19:37

2 stops18h 52m

Seattle/Tacoma Intl

Tue 13/5

07:20-06:30

1 stop15h 10m

£458

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 30/5

06:40-13:50

1 stop15h 10m

Seattle/Tacoma Intl

Fri 6/6

16:00-16:00

1 stop16h 00m

£459

LondonSeattle

STN - SEA

STNSEA

London Stansted

Tue 6/5

21:15-15:05

2 stops25h 50m

Seattle/Tacoma Intl

Sun 11/5

17:05-22:40

2 stops21h 35m

£461

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 30/4

10:50-16:59

1 stop14h 09m

Seattle/Tacoma Intl

Wed 7/5

08:10-06:55

1 stop14h 45m

£463

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 5/5

06:20-16:59

1 stop18h 39m

Seattle/Tacoma Intl

Mon 12/5

20:20-13:40

Nonstop9h 20m

£466

Flights are sorted by cheapest return flights first.

Deals found on 15/4

Showing 1-10 of 60 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.

Cheapflights Insights

Everything you need to know about your flight from London to Seattle

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 Monday (22 on average). You will have fewer flight options on Sunday, 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

7,917 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

7,917 reviews

Delta

8.0

Very Good

7,917 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

1,326 reviews

Delta

8.0

Very Good

7,917 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

1,269 reviews

Delta

8.0

Very Good

7,917 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

Air France

7.5

Good

1,435 reviews

Delta

8.0

Very Good

7,917 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

1,580 reviews

Delta

8.0

Very Good

7,917 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 19 daily inbound flights from London from 13 different airlines.
What are the cheapest airlines flying from London to Seattle round-trip?
Icelandair, at £429, was found to be the cheapest airline from London to Seattle.Alternate airlines flying return to your destination include Lufthansa and Finnair. Icelandair is priced at 26% 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?
£401 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 Lufthansa, with prices starting from £403 and £477, 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 (96%), Aeromexico (91%) or KLM (91%) 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 £1,491 for a flight from London to Seattle. The cheapest flight overall is £474 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £369.
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
Aer Lingus	Cheapest£8	Average£686	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
Icelandair	Cheapest£330	Average£516	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
Air France	Cheapest£391	Average£576	FlexibilityNo cancel fee	On-time77%	Search Air France flights
Lufthansa	Cheapest£402	Average£502	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
United Airlines	Cheapest£405	Average£629	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
KLM	Cheapest£413	Average£592	FlexibilityNo cancel fee	On-time75%	Search KLM flights
Finnair	Cheapest£419	Average£578	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
British Airways	Cheapest£439	Average£630	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Delta	Cheapest£452	Average£625	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
Virgin Atlantic	Cheapest£458	Average£604	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic 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 £326

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 27/5. Fares are subject to change and may not be available on all flights or dates of travel.

Cheapflights Tip: The best prices from London to Seattle/Tacoma Intl are usually found in January or March, 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 16 April 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 16 April 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from London to Seattle that are best for you.

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.

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Everything you need to know about your flight from London to Seattle

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 11 April 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 16 April 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 16 April 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?

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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 16 April 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 16 April 2025.