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.

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

As of November 2025, 89 flights take off from London and land in Seattle each week. The most common flight departure day for this route is Mon, with 17% of weekly flights taking off on this day.

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 45m.

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

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

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

The number of flights available between London and Seattle is 12 per day as of November 2025. The most frequent departure time is 12:00PM, with 84% of daily flights leaving in the afternoon.

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

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

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 40% 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.

How often are flights from London to Seattle delayed?

Historically, on average around 13% 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 117 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 6% of their flights experiencing any sort of delay.

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

Frankfurt am Main (FRA) has the shortest average layover time for this route: 3h 23m.

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?

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

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 November 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.

$486 Cheap Flights from London to Seattle in 2025/26

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12:15 pm - 5:00 pmLHR-SEA

12h 45m1 stop

2:35 pm - 7:30 pmSEA-LHR

20h 55m1 stop

$630Icelandair

Find Deal

mié., dic. 10 - lun., ene. 5

11:20 am - 1:17 pmLGW-SEA

33h 57m2 stops

6:00 am - 9:00 amSEA-LGW

19h 00m2 stops

$632American Airlines

Find Deal

jue., ene. 8 - jue., ene. 15

10:45 am - 11:51 pmLHR-SEA

45h 06m2 stops

10:50 am - 6:50 amSEA-LHR

36h 00m1 stop

$635Iberia

Find Deal

dom., feb. 1 - dom., feb. 8

8:15 am - 10:07 pmLHR-SEA

21h 52m2 stops

8:04 am - 10:10 amSEA-LHR

18h 06m2 stops

$636Finnair

Find Deal

jue., ene. 8 - jue., ene. 15

5:15 pm - 6:20 pmLCY-SEA

33h 05m1 stop

8:05 pm - 6:35 pmSEA-LCY

14h 30m1 stop

$638British Airways

Find Deal

mar., dic. 2 - mié., dic. 10

12:35 pm - 10:20 pmLHR-SEA

17h 45m1 stop

10:50 am - 1:30 pmSEA-LHR

18h 40m2 stops

$639Iberia

Find Deal

lun., ene. 19 - lun., feb. 2

12:40 pm - 10:25 pmLHR-SEA

17h 45m1 stop

11:25 am - 10:00 amSEA-LHR

14h 35m1 stop

$643Delta

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mar., ene. 6 - mar., ene. 13

2:55 pm - 4:55 pmLHR-SEA

10h 00mnonstop

6:50 pm - 12:20 pmSEA-LHR

9h 30mnonstop

$644Finnair

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jue., feb. 12 - lun., feb. 23

7:15 am - 9:59 pmLCY-SEA

22h 44m2 stops

8:05 pm - 6:35 pmSEA-LCY

14h 30m1 stop

$646British Airways

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mié., dic. 10 - lun., dic. 15

10:00 am - 11:50 amLCY-SEA

33h 50m1 stop

9:05 am - 9:30 amSEA-LCY

16h 25m2 stops

$741Delta

Find Deal

jue., ene. 29 - dom., feb. 1

Icelandair flights from London to Seattle

Our best Icelandair deals on London to Seattle flight tickets

Icelandair

Dec 10

LHR12:15 pmLondon Heathrow

12h 45m

1 stop

SEA5:00 pmSeattle/Tacoma Intl

Jan 5

SEA2:35 pmSeattle/Tacoma Intl

20h 55m

1 stop

LHR7:30 pmLondon Heathrow

$630

Find similar

Icelandair

May 1

LGW3:40 pmLondon Gatwick

34h 10m

1 stop

SEA5:50 pmSeattle/Tacoma Intl

May 14

SEA7:00 pmSeattle/Tacoma Intl

11h 40m

1 stop

LGW2:40 pmLondon Gatwick

$633

Find similar

Icelandair

Mar 16

LGW11:55 amLondon Gatwick

13h 05m

1 stop

SEA6:00 pmSeattle/Tacoma Intl

Apr 4

SEA7:00 pmSeattle/Tacoma Intl

11h 40m

1 stop

LGW2:40 pmLondon Gatwick

$637

Find similar

American Airlines flights from London to Seattle

Our best American Airlines deals on London to Seattle flight tickets

American Airlines

Jan 8

LGW11:20 amLondon Gatwick

33h 57m

2 stops

SEA1:17 pmSeattle/Tacoma Intl

Jan 15

SEA6:00 amSeattle/Tacoma Intl

19h 00m

2 stops

LGW9:00 amLondon Gatwick

$632

Find similar

American Airlines

Jan 28

LHR2:55 pmLondon Heathrow

10h 00m

SEA4:55 pmSeattle/Tacoma Intl

Feb 1

SEA6:50 pmSeattle/Tacoma Intl

9h 30m

LHR12:20 pmLondon Heathrow

$658

Find similar

American Airlines

Feb 13

LHR9:25 amLondon Heathrow

10h 05m

SEA11:30 amSeattle/Tacoma Intl

Feb 15

SEA6:50 pmSeattle/Tacoma Intl

9h 30m

LHR12:20 pmLondon Heathrow

$683

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Fly from

Fly to

Route

Depart

Return

Price

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

mié. 12/10

12:15 pm-5:00 pm

1 stop12h 45m

Seattle/Tacoma Intl

lun. 1/5

2:35 pm-7:30 pm

1 stop20h 55m

$630

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

jue. 1/8

11:20 am-1:17 pm

2 stops33h 57m

Seattle/Tacoma Intl

jue. 1/15

6:00 am-9:00 am

2 stops19h 00m

$632

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

dom. 2/1

10:45 am-11:51 pm

2 stops45h 06m

Seattle/Tacoma Intl

dom. 2/8

10:50 am-6:50 am

1 stop36h 00m

$635

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

jue. 1/8

8:15 am-10:07 pm

2 stops21h 52m

Seattle/Tacoma Intl

jue. 1/15

8:04 am-10:10 am

2 stops18h 06m

$636

LondonSeattle

LCY - SEA

LCYSEA

London City

mar. 12/2

5:15 pm-6:20 pm

1 stop33h 05m

Seattle/Tacoma Intl

mié. 12/10

8:05 pm-6:35 pm

1 stop14h 30m

$638

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

lun. 1/19

12:35 pm-10:20 pm

1 stop17h 45m

Seattle/Tacoma Intl

lun. 2/2

10:50 am-1:30 pm

2 stops18h 40m

$639

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

mar. 1/6

12:40 pm-10:25 pm

1 stop17h 45m

Seattle/Tacoma Intl

mar. 1/13

11:25 am-10:00 am

1 stop14h 35m

$643

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

jue. 2/12

2:55 pm-4:55 pm

Nonstop10h 00m

Seattle/Tacoma Intl

lun. 2/23

6:50 pm-12:20 pm

Nonstop9h 30m

$644

LondonSeattle

LCY - SEA

LCYSEA

London City

mié. 12/10

7:15 am-9:59 pm

2 stops22h 44m

Seattle/Tacoma Intl

lun. 12/15

8:05 pm-6:35 pm

1 stop14h 30m

$646

LondonSeattle

LCY - SEA

LCYSEA

London City

jue. 1/29

10:00 am-11:50 am

1 stop33h 50m

Seattle/Tacoma Intl

dom. 2/1

9:05 am-9:30 am

2 stops16h 25m

$741

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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

Layovers

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 $668. 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 $669.

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 $769. 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 $1,028.

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 $820 when looking at flights departing in the afternoon. Flights to Seattle are more costly in the morning, with an average ticket price of $868. 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 $776 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 $707 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.

How have London to Seattle flight prices changed over time?

As of November 2025, prices for London to Seattle flights are approximately 14% 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	$728
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 $728. The best round-trip flight deal from London to Seattle found on momondo in the last 72 hours is $880.

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 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 November 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 27.00% of all bookings. The subsequent popular models are Boeing 787-10 Dreamliner at 23.51%, Airbus A330-900neo at 20.29%, and Airbus A330-200 at 10.91%.
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 (25% of total bookings). The next most popular airlines are British Airways (24%), Icelandair (18%), 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 $418	Free Cancellation	Rating 7.0 582 reviews	Search Icelandair flights
British Airways	PriceFrom $553	Free Cancellation	Rating 6.7 7,539 reviews	Search British Airways flights
American Airlines	PriceFrom $589	Free Cancellation	Rating 7.2 11,037 reviews	Search American Airlines flights
Virgin Atlantic	PriceFrom $594	Free Cancellation	Rating 7.5 675 reviews	Search Virgin Atlantic flights
Delta	PriceFrom $594	Free Cancellation	Rating 7.9 8,004 reviews	Search Delta flights

Delta Flights From London to Seattle
Across 10 Delta flights from London to Seattle this week, the average price was $825, with the best Delta deals starting from $594 round-trip. 8,004 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 10 flights to Seattle from London in an average week. Users have rated it 7.5/10 across 675 reviews.

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SeaTac

Ocean Shores

Renton

Olympia

Lynnwood

Kent

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Redmond

Tukwila

Cle Elum

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Fife

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Kirkland

Westport

Shoreline

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.

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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 $546

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 1/10. 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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Icelandair flights from London to Seattle

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Our best American Airlines deals on London to Seattle flight tickets

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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 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.

How have London to Seattle flight prices changed over time?

As of November 2025, prices for London to Seattle flights are approximately 14% 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?

British Airways, SWISS, and Lufthansa 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 13% 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 117 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?

Tuesday is statistically the day of the week which experiences the fewest number of delays on this flight route. Wednesday 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 6% of their flights experiencing any sort of delay.

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 45m.

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

Frankfurt am Main (FRA) has the shortest average layover time for this route: 3h 23m.

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

The number of flights available between London and Seattle is 12 per day as of November 2025. The most frequent departure time is 12:00PM, with 84% of daily flights leaving in the afternoon.

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

As of November 2025, 89 flights take off from London and land in Seattle each week. The most common flight departure day for this route is Mon, with 17% 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?