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 37% 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.

Which layover airport has the shortest travel time from London to Seattle?

Flights connecting via Reykjavik (KEF) have the shortest average one-way travel time: 12h 40m.

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

As of October 2025, 92 flights take off from London and land in Seattle each week. The most common flight departure day for this route is Tue, with 23% of weekly flights taking off on this day.

Which airport is the most popular layover for flights between London and Seattle?

Reykjavik (KEF) was the most common stop: 94% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport offers the lowest fares from London to Seattle?

Flights via Reykjavik (KEF) offer the lowest average round-trip price of $510.

Which layover airport has the shortest connection time from London to Seattle?

Reykjavik (KEF) has the shortest average layover time for this route: 2h 50m.

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

The number of flights available between London and Seattle is 13 per day as of October 2025. The most frequent departure time is 12:00PM, with 78% of daily flights leaving in the afternoon.

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

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

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 October 2025.

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.

$518 Cheap Flights from London to Seattle in 2025/26

Q: What is the typical price of a round-trip flight between London and Seattle?

Prices are currently low for flights on this route. Typical prices usually range from $644 to $802. The lowest price recently found on this route was $594.

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11:55 am - 5:00 pmLGW-SEA

13h 05m1 stop

2:35 pm - 10:55 amSEA-LGW

12h 20m1 stop

$594Icelandair

Find Deal

Tue, Nov 25 - Tue, Dec 2

8:35 pm - 5:00 pmLHR-SEA

28h 25m1 stop

2:35 pm - 7:30 pmSEA-LHR

20h 55m1 stop

$596Icelandair

Find Deal

Mon, Nov 17 - Thu, Dec 11

12:15 pm - 5:00 pmLHR-SEA

12h 45m1 stop

2:35 pm - 10:50 amSEA-LHR

12h 15m1 stop

$598Icelandair

Find Deal

Tue, Nov 18 - Thu, Dec 11

6:20 am - 12:25 pmLHR-SEA

13h 05m1 stop

8:20 pm - 12:50 pmSEA-LHR

9h 30mnonstop

$631Virgin Atlantic

Find Deal

Tue, Mar 10 - Tue, Mar 17

6:20 am - 11:25 amLHR-SEA

13h 05m1 stop

7:20 am - 7:50 amSEA-LHR

16h 30m1 stop

$635Virgin Atlantic

Find Deal

Sat, Feb 7 - Sat, Feb 14

6:30 am - 11:50 amLHR-SEA

13h 20m1 stop

6:15 am - 6:25 amSEA-LHR

16h 10m1 stop

$659Delta

Find Deal

Sat, Jan 17 - Sun, Jan 25

11:20 am - 9:45 amLGW-SEA

30h 25m2 stops

5:24 am - 7:30 amSEA-LGW

18h 06m2 stops

$707American Airlines

Find Deal

Tue, Nov 25 - Tue, Dec 2

10:00 am - 11:45 amLCY-SEA

33h 45m1 stop

7:15 am - 4:35 pmSEA-LCY

25h 20m2 stops

$755Delta

Find Deal

Thu, Nov 13 - Mon, Nov 17

9:10 am - 11:08 pmLCY-SEA

20h 58m2 stops

1:48 pm - 2:05 pmSEA-LCY

41h 17m2 stops

$788British Airways

Find Deal

Tue, Mar 10 - Tue, Mar 17

9:10 am - 11:08 pmLCY-SEA

20h 58m2 stops

1:48 pm - 2:05 pmSEA-LCY

41h 17m2 stops

$791British Airways

Find Deal

Tue, Mar 10 - Tue, Mar 17

Virgin Atlantic flights from London to Seattle

Our best Virgin Atlantic deals on London to Seattle flight tickets

Virgin Atlantic

Mar 10

LHR6:20 amLondon Heathrow

13h 05m

1 stop

SEA12:25 pmSeattle/Tacoma Intl

Mar 17

SEA8:20 pmSeattle/Tacoma Intl

9h 30m

LHR12:50 pmLondon Heathrow

$631

Find similar

Virgin Atlantic

Feb 7

LHR6:20 amLondon Heathrow

13h 05m

1 stop

SEA11:25 amSeattle/Tacoma Intl

Feb 14

SEA7:20 amSeattle/Tacoma Intl

16h 30m

1 stop

LHR7:50 amLondon Heathrow

$635

Find similar

Virgin Atlantic

Feb 6

LHR6:20 amLondon Heathrow

15h 00m

1 stop

SEA1:20 pmSeattle/Tacoma Intl

Feb 15

SEA7:20 amSeattle/Tacoma Intl

15h 30m

1 stop

LHR6:50 amLondon Heathrow

$636

Find similar

American Airlines flights from London to Seattle

Our best American Airlines deals on London to Seattle flight tickets

American Airlines

Nov 25

LGW11:20 amLondon Gatwick

30h 25m

2 stops

SEA9:45 amSeattle/Tacoma Intl

Dec 2

SEA5:24 amSeattle/Tacoma Intl

18h 06m

2 stops

LGW7:30 amLondon Gatwick

$707

Find similar

American Airlines

Nov 2

LHR4:30 pmLondon Heathrow

16h 28m

1 stop

SEA12:58 amSeattle/Tacoma Intl

Nov 9

SEA1:59 pmSeattle/Tacoma Intl

13h 41m

1 stop

LHR11:40 amLondon Heathrow

$733

Find similar

American Airlines

Oct 31

LHR11:45 amLondon Heathrow

17h 45m

1 stop

SEA10:30 pmSeattle/Tacoma Intl

Nov 4

SEA1:25 pmSeattle/Tacoma Intl

9h 35m

LHR7:00 amLondon Heathrow

$734

Find similar

Fly from

Fly to

Route

Depart

Return

Price

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Tue 11/25

11:55 am-5:00 pm

1 stop13h 05m

Seattle/Tacoma Intl

Tue 12/2

2:35 pm-10:55 am

1 stop12h 20m

$594

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 11/17

8:35 pm-5:00 pm

1 stop28h 25m

Seattle/Tacoma Intl

Thu 12/11

2:35 pm-7:30 pm

1 stop20h 55m

$596

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 11/18

12:15 pm-5:00 pm

1 stop12h 45m

Seattle/Tacoma Intl

Thu 12/11

2:35 pm-10:50 am

1 stop12h 15m

$598

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 3/10

6:20 am-12:25 pm

1 stop13h 05m

Seattle/Tacoma Intl

Tue 3/17

8:20 pm-12:50 pm

Nonstop9h 30m

$631

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 2/7

6:20 am-11:25 am

1 stop13h 05m

Seattle/Tacoma Intl

Sat 2/14

7:20 am-7:50 am

1 stop16h 30m

$635

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 1/17

6:30 am-11:50 am

1 stop13h 20m

Seattle/Tacoma Intl

Sun 1/25

6:15 am-6:25 am

1 stop16h 10m

$659

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Tue 11/25

11:20 am-9:45 am

2 stops30h 25m

Seattle/Tacoma Intl

Tue 12/2

5:24 am-7:30 am

2 stops18h 06m

$707

LondonSeattle

LCY - SEA

LCYSEA

London City

Thu 11/13

10:00 am-11:45 am

1 stop33h 45m

Seattle/Tacoma Intl

Mon 11/17

7:15 am-4:35 pm

2 stops25h 20m

$755

LondonSeattle

LCY - SEA

LCYSEA

London City

Tue 3/10

9:10 am-11:08 pm

2 stops20h 58m

Seattle/Tacoma Intl

Tue 3/17

1:48 pm-2:05 pm

2 stops41h 17m

$788

LondonSeattle

LCY - SEA

LCYSEA

London City

Tue 3/10

9:10 am-11:08 pm

2 stops20h 58m

Seattle/Tacoma Intl

Tue 3/17

1:48 pm-2:05 pm

2 stops41h 17m

$791

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Layovers

Other information

What is the typical price of a round-trip flight between London and Seattle?

What is the cheapest month to fly to Seattle?

In general, January 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 $633. If you don’t want to visit Seattle in January, then you should wait until February to fly from London, when ticket prices are also cheap, with an average price of $662.

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 $773. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Friday 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 $1,019.

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 $834 when looking at flights departing in the afternoon. Flights to Seattle are more costly in the morning, with an average ticket price of $860. Departure times in the morning 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 $775 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 $726 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?

No. A direct flight is the cheapest option for a flight between London to Seattle.

How have London to Seattle flight prices changed over time?

As of October 2025, prices for London to Seattle flights are approximately 6% 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	$679
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 $679. The best round-trip flight deal from London to Seattle found on momondo in the last 72 hours is $787.

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

Direct flights go from London to Seattle every day.

There is 1 airport near Seattle: 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 10h 05m, 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 October 2025.
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 26.07% of all bookings. The subsequent popular models are Boeing 787-10 Dreamliner at 23.56%, Airbus A330-900neo at 21.66%, and Airbus A330-200 at 9.88%.
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 Delta (26% of total bookings). The next most popular airlines are British Airways (22%), Icelandair (18%), and Virgin Atlantic (17%).

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 $418	Free Cancellation	Rating 7.1 562 reviews	Search Icelandair flights
British Airways	PriceFrom $553	Free Cancellation	Rating 6.7 7,483 reviews	Search British Airways flights
American Airlines	PriceFrom $589	Free Cancellation	Rating 7.2 11,032 reviews	Search American Airlines flights
Virgin Atlantic	PriceFrom $594	Free Cancellation	Rating 7.5 670 reviews	Search Virgin Atlantic flights
Delta	PriceFrom $594	Free Cancellation	Rating 7.9 7,994 reviews	Search Delta flights

Delta Flights From London to Seattle
Across 8 Delta flights from London to Seattle this week, the average price was $826, with the best Delta deals starting from $594 round-trip. 7,995 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 $594 round-trip, depending on your selected dates, with average Virgin Atlantic deals seen on momondo around $878. Virgin Atlantic operates 8 flights to Seattle from London in an average week. Users have rated it 7.5/10 across 670 reviews.

Tacoma

Leavenworth

SeaTac

Ocean Shores

Renton

Olympia

Lynnwood

Kent

Puyallup

Marysville

Redmond

Tukwila

Federal Way

Lakewood

Cle Elum

Fife

Centralia

Kirkland

Shoreline

Westport

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.

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Cheap flights from London to Seattle from $553

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 4/23. 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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Filter for what you want

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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

American Airlines flights from London to Seattle

Our best American Airlines 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.

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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

What is the typical price of a round-trip flight between London and 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?

No. A direct flight is the cheapest option for a flight between London to Seattle.

How have London to Seattle flight prices changed over time?

As of October 2025, prices for London to Seattle flights are approximately 6% 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?

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

What airlines fly to Seattle?

Which airport is the most popular layover for flights between London and Seattle?

Reykjavik (KEF) was the most common stop: 94% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport offers the lowest fares from London to Seattle?

Flights via Reykjavik (KEF) offer the lowest average round-trip price of $510.

Which layover airport has the shortest travel time from London to Seattle?

Flights connecting via Reykjavik (KEF) have the shortest average one-way travel time: 12h 40m.

Which layover airport has the shortest connection time from London to Seattle?

Reykjavik (KEF) has the shortest average layover time for this route: 2h 50m.

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

The number of flights available between London and Seattle is 13 per day as of October 2025. The most frequent departure time is 12:00PM, with 78% of daily flights leaving in the afternoon.

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

As of October 2025, 92 flights take off from London and land in Seattle each week. The most common flight departure day for this route is Tue, with 23% 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.