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

British Airways, at £469, was found to be the cheapest airline from London to Seattle.Alternate airlines flying return to your destination include Delta and United Airlines. British Airways is priced at 18% 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?

£407 is the cheapest one-way deal found within the past few days, from Icelandair. You may also be able to find cheap deals on Aer Lingus and WestJet, with prices starting from £412 and £420, 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 £1,424 for a flight from London to Seattle. The cheapest flight overall is £481 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £336.

What are the most reliable airlines from London to Seattle?

Consider Singapore Airlines (94%), Aeromexico (93%) or Scandinavian Airlines (93%) 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 22% 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 39% 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 £575, or £777 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 £575 on average during January, but can be found for as low as £328.

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 17 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.

£407+ Flights from London to Seattle - Compare & Save Big

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 Monday

Cheap flight deals from London to Seattle

Round-trip from	£469
One-way from	£407
Popular in	August
Cheapest in	January
Average price	£547
Good round-trip deal	£552 or less
Good one-way deal	£653 or less

British Airways
10/6-23/6
2 total stops
30h 30m total
London to Seattle

Search Deals

Icelandair
6/6
1 total stop
13h 00m total
London to Seattle

Search Deals

Highest demand for flights based on searches. 16% potential increase in price (£82 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 May 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 8 May 2025.

Fri 12/913:05LHR - SEA

1 stop12h 45mIcelandair

Sun 14/915:45SEA - LHR

1 stop12h 10mIcelandair

Deal found 6/5£469

Tue 10/613:25LHR - SEA

1 stop12h 25mBritish Airways

Mon 23/619:35SEA - LHR

1 stop18h 05mBritish Airways

Deal found 7/5£469

Fri 23/506:50LHR - SEA

2 stops17h 34mUnited Airlines

Fri 30/505:15SEA - LHR

2 stops17h 40mUnited Airlines

Deal found 7/5£471

Wed 5/1116:10LHR - SEA

Nonstop10h 10mDelta

Wed 19/1122:15SEA - LHR

Nonstop9h 30mDelta

Deal found 7/5£472

Wed 4/606:40LHR - SEA

1 stop15h 10mScandinavian Airlines

Mon 9/616:00SEA - LHR

2 stops19h 55mScandinavian Airlines

Deal found 6/5£472

Tue 28/1009:25LHR - SEA

Nonstop9h 55mAmerican Airlines

Mon 17/1118:50SEA - LHR

Nonstop9h 25mAmerican Airlines

Deal found 7/5£474

Thu 15/513:00LGW - SEA

1 stop12h 50mIcelandair

Sat 24/519:00SEA - LGW

1 stop11h 30mIcelandair

Deal found 7/5£475

Mon 19/513:25LHR - SEA

Nonstop10h 20mVirgin Atlantic

Mon 2/617:35SEA - LHR

Nonstop9h 45mVirgin Atlantic

Deal found 6/5£476

Tue 10/617:25LHR - SEA

Nonstop10h 20mAir France

Wed 18/622:58SEA - LHR

1 stop24h 17mAir France

Deal found 7/5£478

Tue 3/612:00LGW - SEA

1 stop16h 24mVirgin Atlantic

Mon 9/607:20SEA - LGW

1 stop18h 40mVirgin Atlantic

Deal found 7/5£479

Thu 11/909:25LCY - SEA

2 stops17h 11mSWISS

Mon 15/916:25SEA - LCY

1 stop16h 50mSWISS

Deal found 8/5£481

Mon 26/509:55LHR - SEA

1 stop14h 02mMultiple Airlines

Mon 9/620:25SEA - LHR

Nonstop9h 50mMultiple Airlines

Deal found 6/5£481

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 8 May 2025.

Tue 10/613:25LHR - SEA

1 stop12h 25mBritish Airways

Mon 23/619:35SEA - LHR

1 stop18h 05mBritish Airways

Deal found 7/5£469

Tue 4/1106:20LHR - SEA

1 stop13h 00mDelta

Sun 23/1122:55SEA - LHR

1 stop25h 45mDelta

Deal found 7/5£470

Fri 23/506:50LHR - SEA

2 stops17h 34mUnited Airlines

Wed 4/607:20SEA - LHR

2 stops18h 20mUnited Airlines

Deal found 7/5£471

Fri 22/806:15LHR - SEA

1 stop13h 00mAir France

Wed 10/920:25SEA - LHR

Nonstop9h 50mAir France

Deal found 7/5£473

Tue 28/1009:25LHR - SEA

Nonstop9h 55mAmerican Airlines

Mon 17/1118:50SEA - LHR

Nonstop9h 25mAmerican Airlines

Deal found 7/5£474

Tue 28/1011:55LGW - SEA

1 stop13h 05mIcelandair

Thu 13/1114:35SEA - LGW

1 stop12h 20mIcelandair

Deal found 7/5£476

Mon 19/513:25LHR - SEA

Nonstop10h 20mVirgin Atlantic

Mon 2/617:35SEA - LHR

Nonstop9h 45mVirgin Atlantic

Deal found 6/5£478

Tue 3/612:00LGW - SEA

1 stop16h 24mMultiple Airlines

Mon 9/607:20SEA - LGW

1 stop18h 40mMultiple Airlines

Deal found 7/5£479

Thu 11/916:30LHR - SEA

Nonstop9h 50mIberia

Mon 15/920:20SEA - LHR

Nonstop9h 20mIberia

Deal found 7/5£484

Wed 4/609:25LCY - SEA

2 stops21h 17mSWISS

Wed 11/613:45SEA - LCY

2 stops19h 30mSWISS

Deal found 7/5£485

Mon 26/506:40LHR - SEA

1 stop15h 10mScandinavian Airlines

Mon 9/616:00SEA - LHR

2 stops19h 55mScandinavian Airlines

Deal found 7/5£491

Sun 1/620:55LHR - SEA

1 stop22h 45mKLM

Mon 9/620:25SEA - LHR

Nonstop9h 50mKLM

Deal found 8/5£499

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 8 May 2025.

Tue 3/613:25LHR - SEA

Nonstop10h 20mAir France

Tue 10/620:25SEA - LHR

Nonstop9h 50mAir France

Deal found 6/5£470

Mon 19/513:25LHR - SEA

Nonstop10h 20mVirgin Atlantic

Mon 2/617:35SEA - LHR

Nonstop9h 45mVirgin Atlantic

Deal found 7/5£472

Tue 28/1009:25LHR - SEA

Nonstop9h 55mAmerican Airlines

Tue 18/1113:35SEA - LHR

Nonstop9h 25mAmerican Airlines

Deal found 7/5£474

Mon 26/509:50LHR - SEA

Nonstop9h 45mBritish Airways

Mon 9/613:30SEA - LHR

Nonstop9h 20mBritish Airways

Deal found 6/5£478

Thu 11/916:30LHR - SEA

Nonstop9h 50mIberia

Mon 15/920:20SEA - LHR

Nonstop9h 20mIberia

Deal found 7/5£484

Mon 19/513:25LHR - SEA

Nonstop10h 20mDelta

Mon 2/617:35SEA - LHR

Nonstop9h 45mDelta

Deal found 7/5£492

Tue 10/609:25LHR - SEA

Nonstop9h 45mMultiple Airlines

Thu 26/613:30SEA - LHR

Nonstop9h 20mMultiple Airlines

Deal found 6/5£529

Last-minute flights from London to Seattle
Discover last-minute flight deals from London to Seattle. Data last updated 8 May 2025 and is based on user searches.

Mon 12/517:25LHR - SEA

Nonstop10h 15mAir France

Mon 19/520:20SEA - LHR

Nonstop9h 55mAir France

Deal found 5/5£473

Mon 12/520:05LHR - SEA

2 stops30h 28mMultiple Airlines

Mon 19/511:30SEA - LHR

1 stop16h 20mMultiple Airlines

Deal found 5/5£483

Mon 12/509:30LHR - SEA

2 stops31h 48mAir Canada

Mon 19/519:15SEA - LHR

2 stops27h 15mAir Canada

Deal found 5/5£505

Tue 13/509:05LCY - SEA

1 stop15h 54mBritish Airways

Tue 20/519:35SEA - LCY

1 stop17h 15mBritish Airways

Deal found 6/5£482

Tue 13/514:45LHR - SEA

1 stop16h 24mAmerican Airlines

Tue 20/513:30SEA - LHR

Nonstop9h 20mAmerican Airlines

Deal found 6/5£492

Tue 13/509:25LHR - SEA

Nonstop9h 45mIberia

Tue 20/513:30SEA - LHR

Nonstop9h 20mIberia

Deal found 6/5£496

Tue 13/510:00LGW - SEA

1 stop19h 59mMultiple Airlines

Sun 18/519:00SEA - LGW

1 stop32h 45mMultiple Airlines

Deal found 7/5£500

Wed 14/516:30LHR - SEA

Nonstop9h 50mBritish Airways

Wed 21/519:35SEA - LHR

1 stop15h 20mBritish Airways

Deal found 6/5£486

Wed 14/506:30LHR - SEA

2 stops16h 01mKLM

Mon 19/514:10SEA - LHR

1 stop12h 35mKLM

Deal found 7/5£508

Thu 15/513:00LGW - SEA

1 stop12h 50mIcelandair

Sat 24/519:00SEA - LGW

1 stop11h 30mIcelandair

Deal found 7/5£475

Thu 15/513:05LHR - SEA

1 stop12h 45mIcelandair

Sat 24/523:30SEA - LHR

1 stop12h 50mIcelandair

Deal found 7/5£481

Thu 15/506:15LHR - SEA

1 stop13h 00mVirgin Atlantic

Wed 28/517:35SEA - LHR

Nonstop9h 45mVirgin Atlantic

Deal found 6/5£498

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 8 May 2025.

Fri 6/615:40LGW - SEA

1 stop13h 00mIcelandair

Deal found 7/5£407

Fri 3/1006:40STN - SEA

3 stops39h 29mMultiple Airlines

Deal found 7/5£407

Mon 18/810:00LGW - SEA

1 stop20h 00mMultiple Airlines

Deal found 7/5£409

Sun 1/621:25LHR - SEA

2 stops23h 33mMultiple Airlines

Deal found 7/5£409

Fri 6/613:05LHR - SEA

1 stop12h 45mIcelandair

Deal found 7/5£410

Thu 15/507:40LHR - SEA

1 stop18h 10mAer Lingus

Deal found 7/5£412

Wed 18/614:10LHR - SEA

1 stop14h 18mWestJet

Deal found 6/5£420

Thu 24/708:05LTN - SEA

3 stops36h 56mMultiple Airlines

Deal found 7/5£421

Mon 12/507:00SEN - SEA

3 stops44h 10mMultiple Airlines

Deal found 7/5£421

Wed 9/707:00LCY - SEA

3 stops21h 28mMultiple Airlines

Deal found 7/5£436

Wed 1/1010:45LGW - SEA

2 stops41h 44mWestJet

Deal found 7/5£442

Mon 16/609:50LHR - SEA

Nonstop9h 45mIberia

Deal found 6/5£473

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

Fri 12/9

13:05-17:50

1 stop12h 45m

Seattle/Tacoma Intl

Sun 14/9

15:45-11:55

1 stop12h 10m

£469

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 10/6

13:25-17:50

1 stop12h 25m

Seattle/Tacoma Intl

Mon 23/6

19:35-21:40

1 stop18h 05m

£469

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 3/6

13:25-15:45

Nonstop10h 20m

Seattle/Tacoma Intl

Tue 10/6

20:25-14:15

Nonstop9h 50m

£470

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 23/5

06:50-16:24

2 stops17h 34m

Seattle/Tacoma Intl

Fri 30/5

05:15-06:55

2 stops17h 40m

£471

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 19/5

13:25-15:45

Nonstop10h 20m

Seattle/Tacoma Intl

Mon 2/6

17:35-11:20

Nonstop9h 45m

£472

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 4/6

06:40-13:50

1 stop15h 10m

Seattle/Tacoma Intl

Mon 9/6

16:00-19:55

2 stops19h 55m

£472

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 28/10

09:25-12:20

Nonstop9h 55m

Seattle/Tacoma Intl

Tue 18/11

13:35-07:00

Nonstop9h 25m

£474

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Tue 28/10

11:55-18:00

1 stop13h 05m

Seattle/Tacoma Intl

Thu 13/11

14:35-10:55

1 stop12h 20m

£476

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Tue 3/6

12:00-20:24

1 stop16h 24m

Seattle/Tacoma Intl

Mon 9/6

07:20-10:00

1 stop18h 40m

£479

LondonSeattle

LCY - SEA

LCYSEA

London City

Thu 11/9

09:25-18:36

2 stops17h 11m

Seattle/Tacoma Intl

Mon 15/9

16:25-17:15

1 stop16h 50m

£481

Flights are sorted by cheapest return flights first.

Deals found on 8/5

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 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 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 (9 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

7,946 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

7,946 reviews

Delta

8.0

Very Good

7,946 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

1,338 reviews

Delta

8.0

Very Good

7,946 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

1,276 reviews

Delta

8.0

Very Good

7,946 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

1,449 reviews

Delta

8.0

Very Good

7,946 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

1,590 reviews

Delta

8.0

Very Good

7,946 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 17 daily inbound flights from London from 13 different airlines.
What are the cheapest airlines flying from London to Seattle round-trip?
British Airways, at £469, was found to be the cheapest airline from London to Seattle.Alternate airlines flying return to your destination include Delta and United Airlines. British Airways is priced at 18% 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?
£407 is the cheapest one-way deal found within the past few days, from Icelandair. You may also be able to find cheap deals on Aer Lingus and WestJet, with prices starting from £412 and £420, 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 (94%), Aeromexico (93%) or Scandinavian Airlines (93%) 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 £1,424 for a flight from London to Seattle. The cheapest flight overall is £481 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £336.
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£676	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
Icelandair	Cheapest£328	Average£508	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
Air France	Cheapest£388	Average£578	FlexibilityNo cancel fee	On-time77%	Search Air France flights
Lufthansa	Cheapest£398	Average£495	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
United Airlines	Cheapest£401	Average£553	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
KLM	Cheapest£409	Average£582	FlexibilityNo cancel fee	On-time75%	Search KLM flights
Finnair	Cheapest£416	Average£571	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
British Airways	Cheapest£434	Average£613	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Delta	Cheapest£448	Average£619	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
Virgin Atlantic	Cheapest£452	Average£569	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 £407

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 1/6. 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 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 8 May 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 8 May 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 2 May 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 8 May 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 8 May 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 insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated 8 May 2025.

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 8 May 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 8 May 2025.