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

138 flights are operational weekly from Seattle to London Heathrow Airport as of August 2025. The most popular departure day for this route is Mon, with 15% of flights per week taking off on this day.

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

Dublin (DUB) has the shortest average layover time for this route: 1h 54m.

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

Reykjavik (KEF) was the most common stop: 70% of momondo users choosing 1-stop flights on this route connected there.

What airlines fly to London Heathrow Airport?

British Airways, Delta and Virgin Atlantic are the top three most popular airlines that fly to London Heathrow Airport from Seattle 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 London Heathrow Airport. Keep in mind that there are 15 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.

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

As of August 2025, 19 flights take off from Seattle and land in London Heathrow Airport each day. The most common flight departure time for this route is 8:00PM, with 57% of daily flights taking off in the evening.

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

Flights connecting via Dublin (DUB) have the shortest average one-way travel time: 12h 16m.

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

WestJet is the most popular carrier operating from Seattle/Tacoma Intl to London Heathrow

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

Flights via Istanbul (IST) offer the lowest average round-trip price of $802.

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

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

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

The number of operators available for flights from Seattle/Tacoma Intl Airport to London Heathrow Airport is 15 as of August 2025.

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

What documentation or ID do you need to fly to London Heathrow Airport?

The travel and health documents you'll need for your trip to London Heathrow 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 London Heathrow Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$243 Cheap Flights from Seattle to London Heathrow Airport (SEA-LHR) in 2025

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

Prices are currently low for flights on this route. Typical prices usually range from $638 to $885. The lowest price recently found on this route was $507.

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Find the cheapest flights from Seattle to London (SEA-LHR)

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

3:45 pm - 11:55 amSEA-LHR

12h 10m1 stop

1:05 pm - 5:50 pmLHR-SEA

12h 45m1 stop

$507Icelandair

Find Deal

Sat, Sep 27 - Tue, Oct 7

11:25 am - 10:15 amSEA-LHR

14h 50m1 stop

11:30 am - 5:40 pmLHR-SEA

14h 10m1 stop

$508Delta

Find Deal

Wed, Sep 3 - Fri, Sep 12

8:25 pm - 2:15 pmSEA-LHR

9h 50mnonstop

6:15 am - 11:15 amLHR-SEA

13h 00m1 stop

$509Delta

Find Deal

Sun, Sep 14 - Tue, Sep 23

4:45 pm - 10:30 amSEA-LHR

9h 45mnonstop

6:20 am - 11:25 amLHR-SEA

13h 05m1 stop

$510Virgin Atlantic

Find Deal

Wed, Nov 5 - Tue, Nov 11

11:30 pm - 11:55 amSEA-LHR

28h 25m1 stop

1:05 pm - 8:40 pmLHR-SEA

15h 35m1 stop

$511Icelandair

Find Deal

Fri, Sep 5 - Fri, Sep 26

9:05 pm - 3:35 pmSEA-LHR

11h 30m1 stop

12:10 pm - 6:20 pmLHR-SEA

14h 10m1 stop

$521Aer Lingus

Find Deal

Mon, Oct 27 - Sun, Nov 9

4:20 pm - 4:25 pmSEA-LHR

16h 05m2 stops

6:40 am - 2:00 pmLHR-SEA

15h 20m1 stop

$530Scandinavian Airlines

Find Deal

Fri, Oct 3 - Fri, Oct 10

10:35 am - 11:40 amSEA-LHR

17h 05m1 stop

12:35 pm - 11:18 pmLHR-SEA

18h 43m1 stop

$532Iberia

Find Deal

Mon, Nov 3 - Wed, Nov 12

4:20 pm - 5:00 pmSEA-LHR

16h 40m2 stops

6:40 am - 2:00 pmLHR-SEA

15h 20m2 stops

$537Scandinavian Airlines

Find Deal

Sun, Oct 5 - Sun, Oct 19

10:00 pm - 6:50 amSEA-LHR

24h 50m1 stop

12:20 pm - 3:00 pmLHR-SEA

10h 40mnonstop

$551Virgin Atlantic

Find Deal

Sat, Nov 22 - Sat, Dec 6

Virgin Atlantic flights from Seattle to London Heathrow Airport

Our best Virgin Atlantic deals on Seattle to London Heathrow Airport flight tickets

Virgin Atlantic

Nov 22

SEA10:00 pmSeattle/Tacoma Intl

24h 50m

1 stop

LHR6:50 amLondon Heathrow

Dec 6

LHR12:20 pmLondon Heathrow

10h 40m

SEA3:00 pmSeattle/Tacoma Intl

$551

Find similar

Virgin Atlantic

Aug 25

SEA8:25 pmSeattle/Tacoma Intl

9h 50m

LHR2:15 pmLondon Heathrow

Sep 1

LHR5:25 pmLondon Heathrow

10h 25m

SEA7:50 pmSeattle/Tacoma Intl

$836

Find similar

Delta flights from Seattle to London Heathrow Airport

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

Delta

Sep 3

SEA3:05 pmSeattle/Tacoma Intl

15h 30m

1 stop

LHR2:35 pmLondon Heathrow

Sep 11

LHR11:30 amLondon Heathrow

14h 10m

1 stop

SEA5:40 pmSeattle/Tacoma Intl

$508

Find similar

Delta

Sep 14

SEA8:25 pmSeattle/Tacoma Intl

9h 50m

LHR2:15 pmLondon Heathrow

Sep 30

LHR6:15 amLondon Heathrow

19h 25m

1 stop

SEA5:40 pmSeattle/Tacoma Intl

$509

Find similar

Delta

Nov 5

SEA4:45 pmSeattle/Tacoma Intl

9h 45m

LHR10:30 amLondon Heathrow

Nov 11

LHR6:20 amLondon Heathrow

13h 05m

1 stop

SEA11:25 amSeattle/Tacoma Intl

$510

Find similar

momondo Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sat 9/27

3:45 pm-11:55 am

1 stop12h 10m

London Heathrow

Tue 10/7

1:05 pm-5:50 pm

1 stop12h 45m

$507

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 9/3

11:25 am-10:15 am

1 stop14h 50m

London Heathrow

Fri 9/12

11:30 am-5:40 pm

1 stop14h 10m

$508

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 9/14

8:25 pm-2:15 pm

Nonstop9h 50m

London Heathrow

Tue 9/23

6:15 am-11:15 am

1 stop13h 00m

$509

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 11/5

4:45 pm-10:30 am

Nonstop9h 45m

London Heathrow

Tue 11/11

6:20 am-11:25 am

1 stop13h 05m

$510

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Fri 9/5

11:30 pm-11:55 am

1 stop28h 25m

London Heathrow

Fri 9/26

1:05 pm-8:40 pm

1 stop15h 35m

$511

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 10/27

9:05 pm-3:35 pm

1 stop11h 30m

London Heathrow

Sun 11/9

12:10 pm-6:20 pm

1 stop14h 10m

$521

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Fri 10/3

4:20 pm-4:25 pm

2 stops16h 05m

London Heathrow

Fri 10/10

6:40 am-2:00 pm

1 stop15h 20m

$530

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 11/3

10:35 am-11:40 am

1 stop17h 05m

London Heathrow

Wed 11/12

12:35 pm-11:18 pm

1 stop18h 43m

$532

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 10/5

4:20 pm-5:00 pm

2 stops16h 40m

London Heathrow

Sun 10/19

6:40 am-2:00 pm

2 stops15h 20m

$537

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sat 11/22

10:00 pm-6:50 am

1 stop24h 50m

London Heathrow

Sat 12/6

12:20 pm-3:00 pm

Nonstop10h 40m

$551

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 Seattle to London Heathrow Airport

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 Seattle and London Heathrow Airport?

What is the cheapest month to fly to London Heathrow Airport?

The month of March is, on average, the cheapest month to fly to London Heathrow Airport from Seattle, with most prices found around $684. If you’re not able to fly to London Heathrow Airport in March, then April is your next best option. Flight prices from Seattle to London Heathrow Airport during April average around $699.

What is the cheapest day to depart on your flight to London Heathrow Airport?

Our data shows that Tuesday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $810. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $932.

What is the cheapest time of day to depart on your flight to London Heathrow Airport?

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the evening. momondo users have found flights departing from Seattle to London Heathrow Airport in the evening for as low as $845. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the morning are often more expensive with an average ticket price of $987.

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

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

How far in advance should I book a flight to London Heathrow Airport?

You are more likely to see cheaper flights to London Heathrow Airport from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around $804 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London Heathrow Airport from Seattle for as low as $701 on momondo.

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

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

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

As of August 2025, prices for Seattle to London Heathrow Airport flights are approximately 54% cheaper when compared to flights at the same time last year.

When to book flights from Seattle to London Heathrow Airport

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

Estimated round-trip price

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

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

Best Price Found	$243
Fastest flight time	9h 45m
Direct flights	Every day

The best one-way flight to London Heathrow Airport from Seattle in the past 72 hours is $243. The best round-trip flight deal from Seattle to London Heathrow Airport found on momondo in the last 72 hours is $507.

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

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

Search flight deals

How far is Seattle/Tacoma Intl to London Heathrow by plane?
The straight-line distance from Seattle/Tacoma Intl to London Heathrow is 4774.1 mi. 9h 45m is a normal flight duration for this route.
When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to London Heathrow Airport?
Prices for flights from Seattle/Tacoma Intl Airport to London Heathrow Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to London Heathrow Airport?
The number of operators available for flights from Seattle/Tacoma Intl Airport to London Heathrow Airport is 15 as of August 2025.
How old do you have to be to fly from Seattle/Tacoma Intl Airport to London Heathrow 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 Seattle/Tacoma Intl Airport to London Heathrow Airport.
What documentation or ID do you need to fly to London Heathrow Airport?
The travel and health documents you'll need for your trip to London Heathrow 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 London Heathrow 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 Seattle to London Heathrow Airport?
Based on momondo bookings for flights between Seattle and London Heathrow Airport, the leading plane model is Boeing 787-10 Dreamliner, making up 33.66% of the total bookings. Other popular models include Airbus A330-900neo with 20.70%, Boeing 777-300 with 12.83%, and Boeing 787-9 Dreamliner with 9.37%.
What is the most popular airline from Seattle to London Heathrow Airport?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Seattle to London Heathrow Airport is British Airways (28% of total bookings). The next most popular airlines are Delta (23%), Virgin Atlantic (15%), and Iberia (10%).

Best airlines flying from Seattle to London Heathrow Airport

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

Airline	Rating	Free Cancellation	Price
Lufthansa	PriceFrom $378	Free Cancellation	Rating 6.8 7,330 reviews	Search Lufthansa flights
Icelandair	PriceFrom $497	Free Cancellation	Rating 7.0 527 reviews	Search Icelandair flights
Scandinavian Airlines	PriceFrom $532	Free Cancellation	Rating 7.4 1,470 reviews	Search Scandinavian Airlines flights
Air France	PriceFrom $532	Free Cancellation	Rating 7.4 1,468 reviews	Search Air France flights
United Airlines	PriceFrom $547	Free Cancellation	Rating 7.4 8,925 reviews	Search United Airlines flights
Finnair	PriceFrom $556	Free Cancellation	Rating 7.6 1,320 reviews	Search Finnair flights
British Airways	PriceFrom $564	Free Cancellation	Rating 6.6 7,277 reviews	Search British Airways flights
Delta	PriceFrom $574	Free Cancellation	Rating 8.0 7,981 reviews	Search Delta flights
Aer Lingus	PriceFrom $576	Free Cancellation	Rating 7.2 1,220 reviews	Search Aer Lingus flights
Iberia	PriceFrom $578	Free Cancellation	Rating 7.0 2,884 reviews	Search Iberia flights

Delta Flights From Seattle to London Heathrow Airport
Delta is one of the most popular airlines flying from Seattle to London Heathrow Airport, operating 14 flights/week on average for this route. A good Delta flight deal for Seattle to London Heathrow Airport starts from $574 round-trip, up to an average price of $849. Our users have rated Delta at 8.0/10.
Alaska Airlines Flights From Seattle to London Heathrow Airport
Another popular option for Seattle to London Heathrow Airport flights is Alaska Airlines (8.0/10, 10,000 ratings). Alaska Airlines flies from Seattle to London Heathrow Airport around 12 times per week, with deals starting from $808 round-trip and rising to an average price of around $1,066.

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Stansted

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Watford

Why use momondo?

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

Finding the right flight to London from Seattle is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to London quick and easy, saving you time and money.

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

Flights from Seattle to London with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

Once you have performed a search for Seattle to London 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 Seattle to London right now. Can momondo alert me if prices change?

Price alerts on flights to London from Seattle 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.

An easier way to manage your London Heathrow Airport 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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Flights to London Gatwick Airportfrom $345

Flights to London City Airportfrom $456

Flights to London Stansted Airportfrom $424

Flights to London Luton Airportfrom $421

Flights to London Southend Airportfrom $569

Flights to Glasgow Intl Airportfrom $405

Flights to Belfast Intl Airportfrom $499

Flights to Belfast City Airportfrom $517

Cheap flights from Seattle to London from $243

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to London departing on 9/20. 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 Seattle to London (SEA-LHR)

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Virgin Atlantic flights from Seattle to London Heathrow Airport

Our best Virgin Atlantic deals on Seattle to London Heathrow Airport flight tickets

Delta flights from Seattle to London Heathrow Airport

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

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

See travel insights to London from

How to get the cheapest flight ticket from Seattle to London Heathrow Airport

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 Seattle and London Heathrow Airport?

What is the cheapest month to fly to London Heathrow Airport?

What is the cheapest day to depart on your flight to London Heathrow Airport?

Our data shows that Tuesday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $810. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $932.

What is the cheapest time of day to depart on your flight to London Heathrow Airport?

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

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

How far in advance should I book a flight to London Heathrow Airport?

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

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

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

As of August 2025, prices for Seattle to London Heathrow Airport flights are approximately 54% cheaper when compared to flights at the same time last year.

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

WestJet is the most popular carrier operating from Seattle/Tacoma Intl to London Heathrow

What airlines fly to London Heathrow Airport?

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

Reykjavik (KEF) was the most common stop: 70% of momondo users choosing 1-stop flights on this route connected there.

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

Flights via Istanbul (IST) offer the lowest average round-trip price of $802.

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

Flights connecting via Dublin (DUB) have the shortest average one-way travel time: 12h 16m.

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

Dublin (DUB) has the shortest average layover time for this route: 1h 54m.

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

As of August 2025, 19 flights take off from Seattle and land in London Heathrow Airport each day. The most common flight departure time for this route is 8:00PM, with 57% of daily flights taking off in the evening.

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

138 flights are operational weekly from Seattle to London Heathrow Airport as of August 2025. The most popular departure day for this route is Mon, with 15% of flights per week taking off on this day.

When to book flights from Seattle to London Heathrow Airport

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

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

Best Price Found

Fastest flight time

Direct flights

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

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

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

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

What documentation or ID do you need to fly to London Heathrow Airport?

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

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

Best airlines flying from Seattle to London Heathrow Airport

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

Delta Flights From Seattle to London Heathrow Airport

Alaska Airlines Flights From Seattle to London Heathrow Airport

Traveling to a place near London?

Why use momondo?

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

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

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

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

An easier way to manage your London Heathrow Airport 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 London

Popular cities in the United Kingdom