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

British Airways, at £475, was found to be the cheapest airline from London to Seattle.Alternate airlines flying return to your destination include Icelandair and Air France. British Airways is priced at 14% 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?

£392 is the cheapest one-way deal found within the past few days, from Aer Lingus. You may also be able to find cheap deals on WestJet and Scandinavian Airlines, with prices starting from £399 and £448, 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 £2,130 for a flight from London to Seattle. The cheapest flight overall is £340 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £234.

What are the most reliable airlines from London to Seattle?

Consider Aeromexico (97%), KLM (92%) or Air France (92%) 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 21% 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 38% 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 £546, or £790 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 £556 on average during January, but can be found for as low as £322.

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 18 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.

£389+ Flights from London to Seattle

Cheapflights Tip: The best prices from London to Seattle/Tacoma Intl are usually found in January or March, booked 43 days in advance, depart on a Tuesday or Wednesday and return on a Tuesday

Cheap flight deals from London to Seattle

Round-trip from	£475
One-way from	£389
Popular in	August
Cheapest in	January
Average price	£557
Good round-trip deal	£499 or less
Good one-way deal	£526 or less

British Airways
10/9-14/9
Nonstop
19h 10m total
London to Seattle

Search Deals

31/7
3 total stops
37h 41m total
London to Seattle

Search Deals

Highest demand for flights based on searches. 15% potential increase in price (£75 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease (£13 potential savings vs. average return price).

Search Deals

Average for round-trip flights in June 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 13 June 2025.

Wed 10/916:30LHR - SEA

Nonstop9h 50mBritish Airways

Sun 14/920:20SEA - LHR

Nonstop9h 20mBritish Airways

Deal found 11/6£475

Thu 10/715:40LGW - SEA

1 stop13h 00mIcelandair

Thu 24/723:30SEA - LGW

1 stop28h 15mIcelandair

Deal found 11/6£476

Wed 9/709:00LHR - SEA

1 stop16h 25mAir France

Wed 16/720:25SEA - LHR

Nonstop9h 50mAir France

Deal found 11/6£476

Sat 6/910:25LGW - SEA

1 stop19h 11mMultiple Airlines

Sat 4/1019:59SEA - LGW

1 stop30h 56mMultiple Airlines

Deal found 12/6£478

Wed 9/706:15LHR - SEA

1 stop13h 00mVirgin Atlantic

Tue 22/717:35SEA - LHR

Nonstop9h 45mVirgin Atlantic

Deal found 12/6£478

Fri 27/621:25LHR - SEA

1 stop22h 00mIcelandair

Mon 30/623:30SEA - LHR

1 stop28h 25mIcelandair

Deal found 12/6£479

Sun 31/811:45LHR - SEA

1 stop32h 00mDelta

Mon 8/907:13SEA - LHR

1 stop15h 12mDelta

Deal found 11/6£480

Wed 29/1013:30LCY - SEA

2 stops40h 45mSWISS

Sat 15/1115:37SEA - LCY

2 stops17h 28mSWISS

Deal found 12/6£482

Wed 9/710:30LHR - SEA

1 stop16h 41mFinnair

Wed 16/717:40SEA - LHR

1 stop13h 30mFinnair

Deal found 11/6£482

Fri 22/817:05STN - SEA

3 stops28h 45mMultiple Airlines

Sat 30/816:00SEA - STN

2 stops24h 20mMultiple Airlines

Deal found 12/6£486

Fri 22/807:30LHR - SEA

2 stops19h 06mMultiple Airlines

Sun 14/905:30SEA - LHR

2 stops17h 00mMultiple Airlines

Deal found 12/6£487

Wed 10/908:40LHR - SEA

2 stops18h 51mAir Canada

Sun 14/905:30SEA - LHR

2 stops17h 00mAir Canada

Deal found 11/6£489

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 13 June 2025.

Wed 10/916:30LHR - SEA

Nonstop9h 50mBritish Airways

Sun 14/920:20SEA - LHR

Nonstop9h 20mBritish Airways

Deal found 11/6£475

Thu 10/715:40LGW - SEA

1 stop13h 00mIcelandair

Thu 24/723:30SEA - LGW

1 stop28h 15mIcelandair

Deal found 11/6£476

Wed 9/709:00LHR - SEA

1 stop16h 25mAir France

Wed 16/720:25SEA - LHR

Nonstop9h 50mAir France

Deal found 11/6£476

Sat 6/910:25LGW - SEA

1 stop19h 11mMultiple Airlines

Sat 4/1019:59SEA - LGW

1 stop30h 56mMultiple Airlines

Deal found 12/6£478

Wed 9/706:15LHR - SEA

1 stop13h 00mVirgin Atlantic

Tue 22/717:35SEA - LHR

Nonstop9h 45mVirgin Atlantic

Deal found 12/6£478

Sun 31/811:45LHR - SEA

1 stop32h 00mDelta

Mon 8/920:25SEA - LHR

Nonstop9h 50mDelta

Deal found 11/6£480

Wed 29/1013:30LCY - SEA

2 stops40h 45mSWISS

Sat 15/1115:37SEA - LCY

2 stops17h 28mSWISS

Deal found 12/6£482

Wed 9/710:30LHR - SEA

1 stop16h 41mFinnair

Wed 16/717:40SEA - LHR

1 stop13h 30mFinnair

Deal found 11/6£482

Wed 9/716:25LHR - SEA

1 stop16h 18mAmerican Airlines

Mon 14/717:40SEA - LHR

1 stop13h 30mAmerican Airlines

Deal found 12/6£489

Wed 10/908:40LHR - SEA

2 stops18h 51mAir Canada

Sun 14/905:30SEA - LHR

2 stops17h 00mAir Canada

Deal found 11/6£489

Sat 28/606:30LHR - SEA

1 stop13h 10mKLM

Tue 15/717:35SEA - LHR

Nonstop9h 45mKLM

Deal found 11/6£498

Wed 27/806:40LHR - SEA

1 stop15h 10mScandinavian Airlines

Sat 6/916:00SEA - LHR

1 stop21h 40mScandinavian Airlines

Deal found 11/6£503

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 13 June 2025.

Wed 10/916:30LHR - SEA

Nonstop9h 50mBritish Airways

Sun 14/920:20SEA - LHR

Nonstop9h 20mBritish Airways

Deal found 11/6£475

Sat 15/1112:20LHR - SEA

Nonstop10h 40mAir France

Wed 19/1117:20SEA - LHR

Nonstop9h 40mAir France

Deal found 11/6£476

Wed 2/717:25LHR - SEA

Nonstop10h 20mKLM

Wed 16/720:25SEA - LHR

Nonstop9h 50mKLM

Deal found 12/6£478

Fri 29/813:25LHR - SEA

Nonstop10h 20mVirgin Atlantic

Wed 17/917:35SEA - LHR

Nonstop9h 45mVirgin Atlantic

Deal found 12/6£478

Mon 25/817:25LHR - SEA

Nonstop10h 20mDelta

Mon 8/920:25SEA - LHR

Nonstop9h 50mDelta

Deal found 11/6£491

Sat 28/617:25LHR - SEA

Nonstop10h 20mMultiple Airlines

Tue 15/720:25SEA - LHR

Nonstop9h 50mMultiple Airlines

Deal found 10/6£573

Sun 31/809:45LHR - SEA

Nonstop9h 45mAmerican Airlines

Sun 7/913:30SEA - LHR

Nonstop9h 20mAmerican Airlines

Deal found 11/6£584

Last-minute flights from London to Seattle
Discover last-minute flight deals from London to Seattle. Data last updated 13 June 2025 and is based on user searches.

Wed 18/606:30LHR - SEA

1 stop17h 25mDelta

Wed 25/605:30SEA - LHR

1 stop20h 20mDelta

Deal found 10/6£480

Wed 18/609:50LHR - SEA

Nonstop9h 45mIberia

Thu 26/613:28SEA - LHR

1 stop13h 02mIberia

Deal found 11/6£495

Wed 18/607:30LHR - SEA

2 stops32h 31mUnited Airlines

Thu 26/605:00SEA - LHR

1 stop20h 40mUnited Airlines

Deal found 11/6£531

Thu 19/615:40LGW - SEA

1 stop13h 00mIcelandair

Thu 26/623:30SEA - LGW

1 stop28h 15mIcelandair

Deal found 11/6£480

Fri 20/609:55LHR - SEA

1 stop14h 00mKLM

Thu 31/720:25SEA - LHR

Nonstop9h 50mKLM

Deal found 11/6£487

Sat 21/609:50LHR - SEA

Nonstop9h 45mBritish Airways

Thu 26/610:09SEA - LHR

1 stop14h 51mBritish Airways

Deal found 12/6£539

Sun 22/619:45LHR - SEA

1 stop23h 30mMultiple Airlines

Tue 8/707:45SEA - LHR

1 stop15h 00mMultiple Airlines

Deal found 11/6£506

Sun 22/612:20LGW - SEA

2 stops20h 24mAmerican Airlines

Tue 8/706:27SEA - LGW

2 stops18h 53mAmerican Airlines

Deal found 11/6£538

Mon 23/621:25LHR - SEA

1 stop22h 00mIcelandair

Mon 7/715:45SEA - LHR

1 stop12h 10mIcelandair

Deal found 12/6£478

Mon 23/613:25LHR - SEA

Nonstop10h 20mVirgin Atlantic

Mon 7/713:30SEA - LHR

1 stop21h 05mVirgin Atlantic

Deal found 12/6£484

Mon 23/617:25LHR - SEA

Nonstop10h 20mAir France

Tue 22/720:25SEA - LHR

Nonstop9h 50mAir France

Deal found 11/6£484

Mon 23/615:10LHR - SEA

1 stop15h 49mAmerican Airlines

Thu 3/713:28SEA - LHR

1 stop13h 02mAmerican Airlines

Deal found 12/6£505

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 13 June 2025.

Thu 31/706:50STN - SEA

3 stops37h 41mMultiple Airlines

Deal found 11/6£389

Mon 1/921:10LHR - SEA

1 stop28h 40mAer Lingus

Deal found 12/6£392

Sun 29/608:30LTN - SEA

3 stops43h 58mMultiple Airlines

Deal found 11/6£392

Mon 23/612:40LGW - SEA

2 stops38h 37mMultiple Airlines

Deal found 11/6£393

Wed 6/819:30LHR - SEA

3 stops55h 08mMultiple Airlines

Deal found 12/6£394

Sat 30/810:45LGW - SEA

2 stops34h 13mWestJet

Deal found 11/6£399

Sat 30/815:35LHR - SEA

2 stops30h 15mScandinavian Airlines

Deal found 11/6£448

Mon 23/608:30LCY - SEA

2 stops19h 58mMultiple Airlines

Deal found 11/6£460

Mon 18/809:50LHR - SEA

Nonstop9h 45mBritish Airways

Deal found 12/6£462

Sun 22/615:40LGW - SEA

1 stop34h 10mIcelandair

Deal found 12/6£464

Sun 22/621:25LHR - SEA

1 stop22h 00mIcelandair

Deal found 12/6£466

Thu 19/614:10LHR - SEA

1 stop13h 07mWestJet

Deal found 11/6£471

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

Wed 10/9

16:30-18:20

Nonstop9h 50m

Seattle/Tacoma Intl

Sun 14/9

20:20-13:40

Nonstop9h 20m

£475

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Thu 10/7

15:40-20:40

1 stop13h 00m

Seattle/Tacoma Intl

Thu 24/7

23:30-11:45

1 stop28h 15m

£476

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 9/7

09:00-17:25

1 stop16h 25m

Seattle/Tacoma Intl

Wed 16/7

20:25-14:15

Nonstop9h 50m

£476

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Sat 6/9

10:25-21:36

1 stop19h 11m

Seattle/Tacoma Intl

Sat 4/10

19:59-10:55

1 stop30h 56m

£478

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 9/7

06:15-11:15

1 stop13h 00m

Seattle/Tacoma Intl

Tue 22/7

17:35-11:20

Nonstop9h 45m

£478

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 27/6

21:25-11:25

1 stop22h 00m

Seattle/Tacoma Intl

Mon 30/6

23:30-11:55

1 stop28h 25m

£479

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 31/8

11:45-11:45

1 stop32h 00m

Seattle/Tacoma Intl

Mon 8/9

20:25-14:15

Nonstop9h 50m

£480

LondonSeattle

LCY - SEA

LCYSEA

London City

Wed 29/10

13:30-23:15

2 stops40h 45m

Seattle/Tacoma Intl

Sat 15/11

15:37-17:05

2 stops17h 28m

£482

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 9/7

10:30-19:11

1 stop16h 41m

Seattle/Tacoma Intl

Wed 16/7

17:40-15:10

1 stop13h 30m

£482

LondonSeattle

STN - SEA

STNSEA

London Stansted

Fri 22/8

17:05-13:50

3 stops28h 45m

Seattle/Tacoma Intl

Sat 30/8

16:00-00:20

2 stops24h 20m

£486

Flights are sorted by cheapest return flights first.

Deals found on 11/6

Showing 1-10 of 56 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 43 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 20% 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

7,950 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Delta

8.0

Very Good

7,950 reviews

Delta

8.0

Very Good

7,950 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

KLM

7.8

Good

1,358 reviews

Delta

8.0

Very Good

7,950 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Finnair

7.6

Good

1,290 reviews

Delta

8.0

Very Good

7,950 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Air France

7.5

Good

1,463 reviews

Delta

8.0

Very Good

7,950 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

SWISS

7.5

Good

1,624 reviews

Delta

8.0

Very Good

7,950 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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 18 daily inbound flights from London from 13 different airlines.
What are the cheapest airlines flying from London to Seattle round-trip?
British Airways, at £475, was found to be the cheapest airline from London to Seattle.Alternate airlines flying return to your destination include Icelandair and Air France. British Airways is priced at 14% 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?
£392 is the cheapest one-way deal found within the past few days, from Aer Lingus. You may also be able to find cheap deals on WestJet and Scandinavian Airlines, with prices starting from £399 and £448, 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 Aeromexico (97%), KLM (92%) or Air France (92%) 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 £2,130 for a flight from London to Seattle. The cheapest flight overall is £340 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £234.
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£7	Average£645	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
Icelandair	Cheapest£321	Average£499	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
Air France	Cheapest£380	Average£553	FlexibilityNo cancel fee	On-time77%	Search Air France flights
Lufthansa	Cheapest£387	Average£484	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
United Airlines	Cheapest£394	Average£530	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Finnair	Cheapest£400	Average£559	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
KLM	Cheapest£401	Average£567	FlexibilityNo cancel fee	On-time75%	Search KLM flights
Air Canada	Cheapest£416	Average£578	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
British Airways	Cheapest£421	Average£585	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Delta	Cheapest£439	Average£632	FlexibilityNo cancel fee	On-timeN/A	Search Delta 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 £389

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 31/7. 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 43 days in advance, depart on a Tuesday or Wednesday and return on a Tuesday

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 13 June 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 13 June 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.

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?

Use this chart to determine the optimal time to book a return flight from London to Seattle. Price data was last updated on 9 June 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 13 June 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 13 June 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 13 June 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 13 June 2025.