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

38 flights are operational weekly from London Heathrow Airport to Seattle as of October 2025. The most popular departure day for this route is Thu, with 39% of flights per week taking off on this day.

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

According to our data, Scandinavian Airlines have had the least number of delays on this route over the last 12 months; with about 4% of their flights experiencing any sort of delay.

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

British Airways, Finnair, and Aer Lingus are the most popular carriers operating from London Heathrow 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.

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

Sunday 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.

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

As of October 2025, 5 flights take off from London Heathrow Airport and land in Seattle each day. The most common flight departure time for this route is 12:00PM, with 78% of daily flights taking off 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 Heathrow Airport 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 15% 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 125 minutes.

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

Prices for flights from London Heathrow Airport to Seattle/Tacoma Intl Airport are updated daily.

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

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from London Heathrow Airport to Seattle/Tacoma Intl Airport.

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

The necessary travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$524 Cheap Flights from London Heathrow Airport to Seattle in 2025/26

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8:35 pm - 5:00 pmLHR-SEA

28h 25m1 stop

2:35 pm - 7:30 pmSEA-LHR

20h 55m1 stop

$595Icelandair

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Tue, Dec 16 - Wed, Jan 14

8:35 pm - 5:00 pmLHR-SEA

28h 25m1 stop

2:35 pm - 7:30 pmSEA-LHR

20h 55m1 stop

$601Icelandair

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Tue, Dec 2 - Tue, Dec 9

8:35 pm - 5:00 pmLHR-SEA

28h 25m1 stop

2:35 pm - 7:30 pmSEA-LHR

20h 55m1 stop

$602Icelandair

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Tue, Dec 2 - Tue, Dec 9

6:20 am - 12:25 pmLHR-SEA

13h 05m1 stop

5:40 pm - 10:30 amSEA-LHR

9h 50mnonstop

$620Virgin Atlantic

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Tue, Mar 10 - Tue, Mar 17

9:25 am - 12:30 pmLHR-SEA

10h 05mnonstop

8:20 pm - 1:45 pmSEA-LHR

9h 25mnonstop

$627British Airways

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Sat, Mar 21 - Sat, Mar 28

2:45 pm - 5:50 pmLHR-SEA

10h 05mnonstop

5:40 pm - 10:30 amSEA-LHR

9h 50mnonstop

$629Virgin Atlantic

Find Deal

Tue, Mar 10 - Tue, Mar 17

9:25 am - 11:30 amLHR-SEA

10h 05mnonstop

7:50 pm - 12:20 pmSEA-LHR

9h 30mnonstop

$630British Airways

Find Deal

Sat, Mar 7 - Sat, Mar 21

8:40 am - 11:40 amLHR-SEA

35h 00m1 stop

7:20 am - 6:50 amSEA-LHR

15h 30m1 stop

$639Delta

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Sun, Feb 8 - Wed, Feb 18

11:45 am - 11:40 amLHR-SEA

31h 55m1 stop

4:45 pm - 10:30 amSEA-LHR

9h 45mnonstop

$653Delta

Find Deal

Mon, Feb 23 - Wed, Mar 4

8:20 am - 1:09 pmLHR-SEA

36h 49m1 stop

5:24 am - 12:15 pmSEA-LHR

22h 51m1 stop

$664American Airlines

Find Deal

Thu, Nov 27 - Mon, Dec 1

Delta flights from London Heathrow Airport to Seattle

Our best Delta deals on London Heathrow Airport to Seattle flight tickets

Delta

Feb 8

LHR8:40 amLondon Heathrow

35h 00m

1 stop

SEA11:40 amSeattle/Tacoma Intl

Feb 18

SEA7:20 amSeattle/Tacoma Intl

15h 30m

1 stop

LHR6:50 amLondon Heathrow

$639

Find similar

Delta

Feb 23

LHR11:45 amLondon Heathrow

31h 55m

1 stop

SEA11:40 amSeattle/Tacoma Intl

Mar 4

SEA4:45 pmSeattle/Tacoma Intl

9h 45m

LHR10:30 amLondon Heathrow

$653

Find similar

Delta

Nov 6

LHR6:30 amLondon Heathrow

13h 15m

1 stop

SEA11:45 amSeattle/Tacoma Intl

Nov 13

SEA4:48 pmSeattle/Tacoma Intl

9h 42m

LHR10:30 amLondon Heathrow

$715

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Icelandair flights from London Heathrow Airport to Seattle

Our best Icelandair deals on London Heathrow Airport to Seattle flight tickets

Icelandair

Dec 16

LHR8:35 pmLondon Heathrow

28h 25m

1 stop

SEA5:00 pmSeattle/Tacoma Intl

Jan 14

SEA2:35 pmSeattle/Tacoma Intl

20h 55m

1 stop

LHR7:30 pmLondon Heathrow

$595

Find similar

Icelandair

Dec 2

LHR8:35 pmLondon Heathrow

28h 25m

1 stop

SEA5:00 pmSeattle/Tacoma Intl

Dec 9

SEA2:35 pmSeattle/Tacoma Intl

20h 55m

1 stop

LHR7:30 pmLondon Heathrow

$601

Find similar

Icelandair

Dec 2

LHR8:35 pmLondon Heathrow

28h 25m

1 stop

SEA5:00 pmSeattle/Tacoma Intl

Dec 9

SEA2:35 pmSeattle/Tacoma Intl

20h 55m

1 stop

LHR7:30 pmLondon Heathrow

$602

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momondo Fare Finder

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

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Price

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 12/16

8:35 pm-5:00 pm

1 stop28h 25m

Seattle/Tacoma Intl

Wed 1/14

2:35 pm-7:30 pm

1 stop20h 55m

$595

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 12/2

8:35 pm-5:00 pm

1 stop28h 25m

Seattle/Tacoma Intl

Tue 12/9

2:35 pm-7:30 pm

1 stop20h 55m

$601

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 12/2

8:35 pm-5:00 pm

1 stop28h 25m

Seattle/Tacoma Intl

Tue 12/9

2:35 pm-7:30 pm

1 stop20h 55m

$602

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 3/10

6:20 am-12:25 pm

1 stop13h 05m

Seattle/Tacoma Intl

Tue 3/17

5:40 pm-10:30 am

Nonstop9h 50m

$620

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 3/21

9:25 am-12:30 pm

Nonstop10h 05m

Seattle/Tacoma Intl

Sat 3/28

8:20 pm-1:45 pm

Nonstop9h 25m

$627

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 3/10

2:45 pm-5:50 pm

Nonstop10h 05m

Seattle/Tacoma Intl

Tue 3/17

5:40 pm-10:30 am

Nonstop9h 50m

$629

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 3/7

9:25 am-11:30 am

Nonstop10h 05m

Seattle/Tacoma Intl

Sat 3/21

7:50 pm-12:20 pm

Nonstop9h 30m

$630

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 2/8

8:40 am-11:40 am

1 stop35h 00m

Seattle/Tacoma Intl

Wed 2/18

7:20 am-6:50 am

1 stop15h 30m

$639

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 2/23

11:45 am-11:40 am

1 stop31h 55m

Seattle/Tacoma Intl

Wed 3/4

4:45 pm-10:30 am

Nonstop9h 45m

$653

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 11/27

8:20 am-1:09 pm

1 stop36h 49m

Seattle/Tacoma Intl

Mon 12/1

5:24 am-12:15 pm

1 stop22h 51m

$664

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How to get the cheapest flight ticket from London Heathrow Airport 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 typical price of a round-trip flight between London Heathrow Airport and Seattle?

What is the cheapest month to fly to Seattle?

In general, February is the cheapest month to fly from London Heathrow Airport to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $648. If you don’t want to visit Seattle in February, then you should wait until September to fly from London Heathrow Airport, when ticket prices are also cheap, with an average price of $688.

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

On average, the least expensive day to fly to Seattle from London Heathrow Airport 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 Heathrow Airport 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 Heathrow Airport 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 Heathrow to Seattle/Tacoma Intl flight route?

Fly from London Heathrow to Seattle/Tacoma Intl for the best London Heathrow - 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 Heathrow Airport 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 Heathrow Airport for as low as $726 on momondo.

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

There are 4 cabin classes available to choose from on London Heathrow 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 Heathrow Airport to Seattle flights?

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

How have London Heathrow Airport to Seattle flight prices changed over time?

As of October 2025, prices for London Heathrow Airport to Seattle flights are approximately 22% more expensive when compared to flights at the same time last year.

When to book flights from London Heathrow Airport to Seattle

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

Estimated round-trip price

Cheap London Heathrow Airport to Seattle (LHR to SEA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London Heathrow Airport 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 Heathrow Airport in the past 72 hours is $679. The best round-trip flight deal from London Heathrow Airport to Seattle found on momondo in the last 72 hours is $787.

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

Direct flights go from London Heathrow Airport to Seattle every day.

There is 1 airport near Seattle: Seattle/Tacoma Intl (SEA)

Search flight deals

How far is London Heathrow to Seattle/Tacoma Intl by plane?
London Heathrow and Seattle/Tacoma Intl are 4774.1 mi apart from one another. 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 Heathrow Airport to Seattle/Tacoma Intl Airport?
Prices for flights from London Heathrow Airport to Seattle/Tacoma Intl Airport are updated daily.
How many operators does momondo search for flights from London Heathrow Airport to Seattle/Tacoma Intl Airport?
The number of operators available for flights from London Heathrow Airport to Seattle/Tacoma Intl Airport is 5 as of October 2025.
How old do you have to be to fly from London Heathrow Airport to Seattle/Tacoma Intl Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from London Heathrow Airport to Seattle/Tacoma Intl Airport.
What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?
The necessary travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from London Heathrow Airport to Seattle?
Based on momondo bookings for flights between London Heathrow Airport and Seattle, the leading plane model is Boeing 787-9 Dreamliner, making up 26.07% of the total bookings. Other popular models include Boeing 787-10 Dreamliner with 23.56%, Airbus A330-900neo with 21.66%, and Airbus A330-200 with 9.88%.
What is the most popular airline from London Heathrow Airport to Seattle?
Based on momondo bookings for flights between London Heathrow Airport and Seattle, the leading airline is British Airways, making up 37% of the total bookings. Other popular airlines include Delta with 28%, Virgin Atlantic with 20%, and American Airlines with 9%.

Best airlines flying from London Heathrow Airport to Seattle

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

Airline	Rating	Free Cancellation	Price
Icelandair	PriceFrom $497	Free Cancellation	Rating 7.1 562 reviews	Search Icelandair flights
British Airways	PriceFrom $553	Free Cancellation	Rating 6.7 7,489 reviews	Search British Airways flights
American Airlines	PriceFrom $589	Free Cancellation	Rating 7.2 11,033 reviews	Search American Airlines flights
Virgin Atlantic	PriceFrom $594	Free Cancellation	Rating 7.5 671 reviews	Search Virgin Atlantic flights
Delta	PriceFrom $594	Free Cancellation	Rating 7.9 7,997 reviews	Search Delta flights

Delta Flights From London Heathrow Airport to Seattle
Delta flies from London Heathrow Airport to Seattle around 4 times per week, with 7,997 momondo users rating the airline 7.9/10. The cheapest Delta deal from London Heathrow Airport to Seattle in the last 72 hours was $594 (round-trip), much lower than the average airfare cost of $826 for Delta flights on this route.
Virgin Atlantic Flights From London Heathrow Airport to Seattle
Virgin Atlantic (7.5/10 from 671 reviews) operates around 4 flights from London Heathrow Airport to Seattle in any given week. The average Virgin Atlantic airfare for this route is around $878, with deals from around $594 rare but found on momondo. Referenced prices are for round-trip London Heathrow Airport to Seattle flight searches in the last 72 hours.

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?

It is quick and easy to find London to Seattle flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Seattle that suits you.

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?

Once you have performed a search for London to Seattle flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Price alerts on flights to Seattle from London are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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Cheap flights from London Heathrow Airport to Seattle from $558

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

See travel insights to Seattle from

How to get the cheapest flight ticket from London Heathrow Airport 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 Heathrow Airport 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 Heathrow to Seattle/Tacoma Intl flight route?

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

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

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

There are 4 cabin classes available to choose from on London Heathrow 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 Heathrow Airport to Seattle flights?

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

How have London Heathrow Airport to Seattle flight prices changed over time?

As of October 2025, prices for London Heathrow Airport to Seattle flights are approximately 22% more expensive when compared to flights at the same time last year.

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

British Airways, Finnair, and Aer Lingus are the most popular carriers operating from London Heathrow to Seattle/Tacoma Intl

What airlines fly to Seattle?

How often are flights from London to Seattle delayed?

Historically, on average around 15% 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 125 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?

Sunday 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, Scandinavian Airlines have had the least number of delays on this route over the last 12 months; with about 4% of their flights experiencing any sort of delay.

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

As of October 2025, 5 flights take off from London Heathrow Airport and land in Seattle each day. The most common flight departure time for this route is 12:00PM, with 78% of daily flights taking off in the afternoon.

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

38 flights are operational weekly from London Heathrow Airport to Seattle as of October 2025. The most popular departure day for this route is Thu, with 39% of flights per week taking off on this day.

When to book flights from London Heathrow Airport to Seattle

Cheap London Heathrow Airport to Seattle (LHR to SEA) flight deals and tips

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

Best Price Found

Fastest flight time

Direct flights

Airports in Seattle

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

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

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

How old do you have to be to fly from London Heathrow Airport 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 Heathrow Airport to Seattle?

What is the most popular airline from London Heathrow Airport to Seattle?

Best airlines flying from London Heathrow Airport to Seattle

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

Delta Flights From London Heathrow Airport to Seattle

Virgin Atlantic Flights From London Heathrow Airport 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