How many flights depart from London to Seattle on average per day?

The number of flights available between London and Seattle is 15 per day as of February 2026. The most frequent departure time is 2:00PM, with 75% of daily flights leaving in the afternoon.

What airlines fly to Seattle?

British Airways, Delta and Virgin Atlantic are the top three most popular airlines that fly to Seattle from London according to our data. British Airways is the first choice among our users, with 41% of people opting to fly with this airline when traveling to Seattle. Keep in mind that there are 5 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

What day of the week experiences the fewest flight delays on this route?

Thursday is statistically the day of the week which experiences the fewest number of delays on this flight route. Monday has historically seen more delays on average compared to the rest of the week.

What is the cheapest airline that flies from London to Seattle/Tacoma Intl?

Icelandair, SWISS, and British Airways are the most popular carriers operating from London to Seattle/Tacoma Intl

What is the most punctual flight time for London to Seattle flights?

Generally, flights departing in the evening tend to experience fewer delays. Flights in the early afternoon have, in the past, seen delays more frequently in comparison.

How often are flights from London to Seattle delayed?

Historically, on average around 12% of flights between London and Seattle have experienced a delay on any given week. The average delay length over the past 12 months has been 128 minutes.

Which airline has the best punctuality record on London to Seattle flights?

According to our data, Delta have had the least number of delays on this route over the last 12 months; with about 5% of their flights experiencing any sort of delay.

How many flights depart from London to Seattle on average per week?

As of February 2026, 111 flights take off from London and land in Seattle each week. The most common flight departure day for this route is Tue, with 19% of weekly flights taking off on this day.

When did momondo last update prices for flights from London to Seattle/Tacoma Intl Airport?

Prices for flights from London to Seattle/Tacoma Intl Airport are refreshed on a daily basis.

How many operators does momondo search for flights from London to Seattle/Tacoma Intl Airport?

There are 5 operators available for flights from London to Seattle/Tacoma Intl Airport as of February 2026.

How old do you have to be to fly from London to Seattle/Tacoma Intl Airport?

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from London to Seattle/Tacoma Intl Airport.

What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

The travel and health documents you'll need for your trip to Seattle/Tacoma Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$392 Cheap Flights from London to Seattle in 2026

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Cheap round-trip flights

Enter your travel dates to find the best prices.

6:20 am - 11:25 am

LHR

SEA

13h 05m

1 stop

8:30 am - 8:45 am

SEA

LHR

16h 15m

1 stop

$500Virgin Atlantic

Tue, Feb 17 - Tue, Feb 24

3:40 pm - 8:40 pm

LGW

SEA

13h 00m

1 stop

7:00 pm - 2:40 pm

SEA

LGW

11h 40m

1 stop

$501Icelandair

Sat, Apr 25 - Sat, May 2

6:30 am - 12:10 pm

LHR

SEA

13h 40m

1 stop

3:40 pm - 11:50 am

SEA

LHR

12h 10m

1 stop

$503Lufthansa

Mon, Feb 16 - Mon, Mar 2

6:20 am - 12:25 pm

LHR

SEA

13h 05m

1 stop

7:20 am - 6:50 am

SEA

LHR

16h 30m

1 stop

$504Virgin Atlantic

Thu, Mar 19 - Thu, Mar 26

12:30 pm - 12:54 pm

LGW

SEA

31h 24m

2 stops

5:30 am - 9:00 am

SEA

LGW

20h 30m

2 stops

$546American Airlines

Wed, Mar 18 - Wed, Mar 25

11:30 am - 12:44 am

LGW

SEA

21h 14m

2 stops

1:19 pm - 8:00 pm

SEA

LGW

22h 41m

2 stops

$557British Airways

Wed, Apr 22 - Tue, Apr 28

10:25 am - 5:38 pm

LGW

SEA

15h 13m

1 stop

1:30 pm - 9:25 am

SEA

LGW

11h 55m

1 stop

$559Delta

Mon, Apr 13 - Thu, May 7

10:35 am - 9:58 am

LGW

SEA

31h 23m

2 stops

1:30 pm - 9:25 am

SEA

LGW

11h 55m

1 stop

$565Delta

Tue, Apr 21 - Tue, Apr 28

8:40 pm - 10:38 pm

LGW

SEA

33h 58m

2 stops

1:19 pm - 8:00 pm

SEA

LGW

22h 41m

2 stops

$566British Airways

Mon, Apr 20 - Tue, Apr 28

6:15 pm - 12:10 pm

LCY

SEA

25h 55m

1 stop

2:00 pm - 5:40 pm

SEA

LCY

19h 40m

1 stop

$566Lufthansa

Fri, Feb 13 - Thu, Feb 19

Virgin Atlantic flights from London to Seattle

Our best Virgin Atlantic deals on London to Seattle flight tickets

Virgin Atlantic

Feb 17

LHR6:20 amLondon Heathrow

13h 05m

1 stop

SEA11:25 amSeattle/Tacoma Intl

Feb 24

SEA8:30 amSeattle/Tacoma Intl

16h 15m

1 stop

LHR8:45 amLondon Heathrow

$500

Virgin Atlantic

Mar 19

LHR6:20 amLondon Heathrow

13h 05m

1 stop

SEA12:25 pmSeattle/Tacoma Intl

Mar 26

SEA7:20 amSeattle/Tacoma Intl

16h 30m

1 stop

LHR6:50 amLondon Heathrow

$504

Virgin Atlantic

Mar 19

LHR6:20 amLondon Heathrow

13h 05m

1 stop

SEA12:25 pmSeattle/Tacoma Intl

Mar 26

SEA7:25 pmSeattle/Tacoma Intl

9h 30m

LHR11:55 amLondon Heathrow

$508

British Airways flights from London to Seattle

Our best British Airways deals on London to Seattle flight tickets

British Airways

Apr 22

LGW11:30 amLondon Gatwick

21h 14m

2 stops

SEA12:44 amSeattle/Tacoma Intl

Apr 28

SEA1:19 pmSeattle/Tacoma Intl

22h 41m

2 stops

LGW8:00 pmLondon Gatwick

$557

British Airways

Apr 12

LHR10:00 pmLondon Heathrow

27h 10m

1 stop

SEA5:10 pmSeattle/Tacoma Intl

Apr 21

SEA1:19 pmSeattle/Tacoma Intl

13h 11m

1 stop

LHR10:30 amLondon Heathrow

$558

British Airways

Apr 14

LHR12:00 pmLondon Heathrow

13h 10m

1 stop

SEA5:10 pmSeattle/Tacoma Intl

May 9

SEA8:20 pmSeattle/Tacoma Intl

9h 25m

LHR1:45 pmLondon Heathrow

$561

Fly from

Fly to

Route

Depart

Return

Price

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 2/17

6:20 am-11:25 am

1 stop13h 05m

Seattle/Tacoma Intl

Tue 2/24

8:30 am-8:45 am

1 stop16h 15m

$500

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Sat 4/25

3:40 pm-8:40 pm

1 stop13h 00m

Seattle/Tacoma Intl

Sat 5/2

7:00 pm-2:40 pm

1 stop11h 40m

$501

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 2/16

6:30 am-12:10 pm

1 stop13h 40m

Seattle/Tacoma Intl

Mon 3/2

3:40 pm-11:50 am

1 stop12h 10m

$503

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 3/19

6:20 am-12:25 pm

1 stop13h 05m

Seattle/Tacoma Intl

Thu 3/26

7:20 am-6:50 am

1 stop16h 30m

$504

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Wed 3/18

12:30 pm-12:54 pm

2 stops31h 24m

Seattle/Tacoma Intl

Wed 3/25

5:30 am-9:00 am

2 stops20h 30m

$546

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Wed 4/22

11:30 am-12:44 am

2 stops21h 14m

Seattle/Tacoma Intl

Tue 4/28

1:19 pm-8:00 pm

2 stops22h 41m

$557

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Mon 4/13

10:25 am-5:38 pm

1 stop15h 13m

Seattle/Tacoma Intl

Thu 5/7

1:30 pm-9:25 am

1 stop11h 55m

$559

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Tue 4/21

10:35 am-9:58 am

2 stops31h 23m

Seattle/Tacoma Intl

Tue 4/28

1:30 pm-9:25 am

1 stop11h 55m

$565

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Mon 4/20

8:40 pm-10:38 pm

2 stops33h 58m

Seattle/Tacoma Intl

Tue 4/28

1:19 pm-8:00 pm

2 stops22h 41m

$566

LondonSeattle

LCY - SEA

LCYSEA

London City

Fri 2/13

6:15 pm-12:10 pm

1 stop25h 55m

Seattle/Tacoma Intl

Thu 2/19

2:00 pm-5:40 pm

1 stop19h 40m

$566

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How to get the cheapest flight ticket from London to Seattle

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Delays

Other information

What is the cheapest month to fly to Seattle?

In general, February is the cheapest month to fly from London to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $616. If you don’t want to visit Seattle in February, then you should wait until January to fly from London, when ticket prices are also cheap, with an average price of $645.

What is the cheapest day to depart on your flight to Seattle?

On average, the least expensive day to fly to Seattle from London is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as $763. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Sunday is the most expensive day to depart from London because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $1,033.

What is the cheapest time of day to depart on your flight to Seattle?

Flying to Seattle from London in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $832 when looking at flights departing in the afternoon. Flights to Seattle are more costly at noon, with an average ticket price of $858. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest London to Seattle/Tacoma Intl flight route?

Fly from London Heathrow to Seattle/Tacoma Intl for the best London - Seattle/Tacoma Intl flight prices

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

You are more likely to see cheaper flights to Seattle from London when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $752 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from London for as low as $704 on momondo.

What cabin class options are available on London to Seattle/Tacoma Intl flights?

There are 4 cabin classes available to choose from on London to Seattle/Tacoma Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on London to Seattle flights?

You could potentially save up to 20% on your flight if you consider stops on a London to Seattle flight.

How have London to Seattle flight prices changed over time?

As of February 2026, prices for London to Seattle flights are approximately 5% more expensive when compared to flights at the same time last year.

When to book flights from London to Seattle

Are you open to changing your travel dates? Check out the ideal times to fly from London to Seattle according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap London to Seattle (LON to SEA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London to Seattle

Best Price Found	$609
Fastest flight time	9h 45m
Direct flights	Every day
Airports in Seattle	1 airport

The best one-way flight to Seattle from London in the past 72 hours is $609. The best round-trip flight deal from London to Seattle found on momondo in the last 72 hours is $600.

The fastest flight from London to Seattle takes 9h 45m

Direct flights go from London to Seattle every day.

There is 1 airport in Seattle. From London there are direct flights to Seattle/Tacoma Intl (SEA).

Search flight deals

How far is London to Seattle/Tacoma Intl by plane?
The straight-line distance from London to Seattle/Tacoma Intl is 4781.3 mi. Flights usually cover this in 9h 45m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from London to Seattle/Tacoma Intl Airport?
Prices for flights from London to Seattle/Tacoma Intl Airport are refreshed on a daily basis.
How many operators does momondo search for flights from London to Seattle/Tacoma Intl Airport?
There are 5 operators available for flights from London to Seattle/Tacoma Intl Airport as of February 2026.
How old do you have to be to fly from London to Seattle/Tacoma Intl Airport?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from London to Seattle/Tacoma Intl Airport.
What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?
The travel and health documents you'll need for your trip to Seattle/Tacoma Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from London to Seattle?
momondo data reveals that the most frequently booked plane model on the route from London to Seattle is Boeing 787-9 Dreamliner, representing 26.55% of all bookings. The subsequent popular models are Boeing 787-10 Dreamliner at 18.40%, Airbus A330-900neo at 12.10%, and Boeing 777-300ER at 11.95%.
What is the most popular airline from London to Seattle?
Based on momondo bookings for this flight route, the most popular airline on flight routes from London to Seattle is British Airways (27% of total bookings). The next most popular airlines are Delta (24%), Icelandair (17%), and Virgin Atlantic (16%).

Best airlines flying from London to Seattle

Compare and see reviews for airlines that fly from London to Seattle with momondo

Airline	Rating	Free Cancellation	Price
Icelandair	PriceFrom $501	Free Cancellation	Rating 7.1 606 reviews	Search Icelandair flights
Virgin Atlantic	PriceFrom $574	Free Cancellation	Rating 7.5 678 reviews	Search Virgin Atlantic flights
Delta	PriceFrom $594	Free Cancellation	Rating 7.9 8,138 reviews	Search Delta flights
American Airlines	PriceFrom $618	Free Cancellation	Rating 7.2 11,215 reviews	Search American Airlines flights
British Airways	PriceFrom $660	Free Cancellation	Rating 6.7 7,711 reviews	Search British Airways flights

Delta Flights From London to Seattle
Across 11 Delta flights from London to Seattle this week, the average price was $871, with the best Delta deals starting from $594 round-trip. 8,138 users have rated Delta on momondo, with an average score of 7.9/10.
Virgin Atlantic Flights From London to Seattle
Virgin Atlantic is also a popular choice for this route. Virgin Atlantic flight deals for London to Seattle start from as low as $574 round-trip, depending on your selected dates, with average Virgin Atlantic deals seen on momondo around $801. Virgin Atlantic operates 11 flights to Seattle from London in an average week. Users have rated it 7.5/10 across 678 reviews.

Tacoma

Leavenworth

SeaTac

Ocean Shores

Renton

Olympia

Lynnwood

Kent

Marysville

Puyallup

Redmond

Cle Elum

Tukwila

Lakewood

Federal Way

Centralia

Westport

Kirkland

Fife

Tumwater

Why use momondo?

Why should I use momondo to find a flight deal from London to Seattle?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from London to Seattle. momondo saves you time and could save you money on your trip.

Can I find flights from London to Seattle with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for London to Seattle flights to just show those with flexible booking policies.

How can momondo help me find flights from London to Seattle?

momondo provides multiple filters to help you find the best flight to Seattle from London. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from London to Seattle right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Seattle, momondo offers a useful price alert feature which will track prices for flights to Seattle from London and alert you when they change.

An easier way to manage your Seattle trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

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Cheap flights from London to Seattle from $470

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London to Seattle departing on 5/7. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Find the cheapest flights from London to Seattle

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Virgin Atlantic flights from London to Seattle

Our best Virgin Atlantic deals on London to Seattle flight tickets

British Airways flights from London to Seattle

Our best British Airways deals on London to Seattle flight tickets

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

See travel insights to Seattle from

How to get the cheapest flight ticket from London to Seattle

What is the cheapest month to fly to Seattle?

What is the cheapest day to depart on your flight to Seattle?

What is the cheapest time of day to depart on your flight to Seattle?

What is the cheapest London to Seattle/Tacoma Intl flight route?

Fly from London Heathrow to Seattle/Tacoma Intl for the best London - Seattle/Tacoma Intl flight prices

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

What cabin class options are available on London to Seattle/Tacoma Intl flights?

There are 4 cabin classes available to choose from on London to Seattle/Tacoma Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on London to Seattle flights?

You could potentially save up to 20% on your flight if you consider stops on a London to Seattle flight.

How have London to Seattle flight prices changed over time?

As of February 2026, prices for London to Seattle flights are approximately 5% more expensive when compared to flights at the same time last year.

What is the cheapest airline that flies from London to Seattle/Tacoma Intl?

Icelandair, SWISS, and British Airways are the most popular carriers operating from London to Seattle/Tacoma Intl

What airlines fly to Seattle?

How often are flights from London to Seattle delayed?

Historically, on average around 12% of flights between London and Seattle have experienced a delay on any given week. The average delay length over the past 12 months has been 128 minutes.

What is the most punctual flight time for London to Seattle flights?

Generally, flights departing in the evening tend to experience fewer delays. Flights in the early afternoon have, in the past, seen delays more frequently in comparison.

What day of the week experiences the fewest flight delays on this route?

Thursday is statistically the day of the week which experiences the fewest number of delays on this flight route. Monday has historically seen more delays on average compared to the rest of the week.

Which airline has the best punctuality record on London to Seattle flights?

According to our data, Delta have had the least number of delays on this route over the last 12 months; with about 5% of their flights experiencing any sort of delay.

How many flights depart from London to Seattle on average per day?

The number of flights available between London and Seattle is 15 per day as of February 2026. The most frequent departure time is 2:00PM, with 75% of daily flights leaving in the afternoon.

How many flights depart from London to Seattle on average per week?

As of February 2026, 111 flights take off from London and land in Seattle each week. The most common flight departure day for this route is Tue, with 19% of weekly flights taking off on this day.

When to book flights from London to Seattle

Cheap London to Seattle (LON to SEA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London to Seattle

Best Price Found

Fastest flight time

Direct flights

Airports in Seattle

How far is London to Seattle/Tacoma Intl by plane?

When did momondo last update prices for flights from London to Seattle/Tacoma Intl Airport?

How many operators does momondo search for flights from London to Seattle/Tacoma Intl Airport?

How old do you have to be to fly from London to Seattle/Tacoma Intl Airport?

What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

What is the most popular plane model from London to Seattle?

What is the most popular airline from London to Seattle?

Best airlines flying from London to Seattle

Compare and see reviews for airlines that fly from London to Seattle with momondo

Delta Flights From London to Seattle

Virgin Atlantic Flights From London to Seattle

Traveling to a place near Seattle?

Why use momondo?

Why should I use momondo to find a flight deal from London to Seattle?

Can I find flights from London to Seattle with flexible booking policies on momondo?

How can momondo help me find flights from London to Seattle?

I’m not ready to book a flight from London to Seattle right now. Can momondo alert me if prices change?

An easier way to manage your Seattle trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United States

Airports servicing Washington