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Cheap flights from London Heathrow Airport to Seattle from $502

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 Heathrow Airport to Seattle departing on 12/15. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from London Heathrow Airport to Seattle

Cheap round-trip flights

Scandinavian Airlines Logo
6:40 am - 2:00 pmLHR-SEA
15h 20m1 stop
Scandinavian Airlines Logo
4:20 pm - 3:35 pmSEA-LHR
39h 15m2 stops
$603Scandinavian Airlines
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Fri, Oct 17 - Fri, Oct 24
British Airways Logo
9:25 am - 12:30 pmLHR-SEA
10h 05mnonstop
British Airways Logo
10:01 am - 6:50 amSEA-LHR
13h 49m1 stop
$604British Airways
Find Deal
Tue, Mar 10 - Tue, Mar 17
Logo
6:30 am - 2:16 pmLHR-SEA
15h 46m2 stops
Logo
10:00 am - 9:35 amSEA-LHR
15h 35m2 stops
$605
Find Deal
Wed, Oct 8 - Tue, Oct 14
Icelandair Logo
12:15 pm - 5:00 pmLHR-SEA
12h 45m1 stop
Icelandair Logo
3:35 pm - 10:50 amSEA-LHR
12h 15m1 stop
$606Icelandair
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Wed, Nov 5 - Sun, Mar 15
Icelandair Logo
8:35 pm - 5:00 pmLHR-SEA
28h 25m1 stop
Icelandair Logo
3:35 pm - 7:30 pmSEA-LHR
20h 55m1 stop
$609Icelandair
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Mon, Nov 3 - Sat, Mar 14
Logo
6:55 am - 4:59 pmLHR-SEA
18h 04m1 stop
Logo
5:30 am - 1:20 pmSEA-LHR
23h 50m1 stop
$610
Find Deal
Fri, Oct 17 - Mon, Oct 20
Virgin Atlantic Logo
12:20 pm - 3:45 pmLHR-SEA
10h 25mnonstop
Virgin Atlantic Logo
4:48 pm - 10:30 amSEA-LHR
9h 42mnonstop
$615Virgin Atlantic
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Wed, Oct 29 - Wed, Nov 5
Virgin Atlantic Logo
5:25 pm - 7:50 pmLHR-SEA
10h 25mnonstop
Virgin Atlantic Logo
5:35 pm - 11:20 amSEA-LHR
9h 45mnonstop
$618Virgin Atlantic
Find Deal
Wed, Oct 8 - Tue, Oct 14
Delta Logo
12:20 pm - 2:48 pmLHR-SEA
10h 28mnonstop
Delta Logo
5:40 pm - 10:30 amSEA-LHR
9h 50mnonstop
$643Delta
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Tue, Nov 4 - Wed, Mar 11
Delta Logo
12:20 pm - 3:45 pmLHR-SEA
10h 25mnonstop
Delta Logo
6:00 am - 6:25 amSEA-LHR
16h 25m1 stop
$644Delta
Find Deal
Wed, Oct 29 - Wed, Nov 5

Air Canada flights from London Heathrow Airport to Seattle

Our best Air Canada deals on London Heathrow Airport to Seattle flight tickets
Air Canada
Sep 22
LHR8:30 amLondon Heathrow
18h 06m
2 stops
SEA6:36 pmSeattle/Tacoma Intl
Oct 6
SEA10:00 amSeattle/Tacoma Intl
15h 35m
2 stops
LHR9:35 amLondon Heathrow
$603
Find similar
Air Canada
Sep 21
LHR2:10 pmLondon Heathrow
27h 12m
1 stop
SEA9:22 amSeattle/Tacoma Intl
Sep 28
SEA7:15 amSeattle/Tacoma Intl
18h 20m
1 stop
LHR9:35 amLondon Heathrow
$611
Find similar
Air Canada
Oct 15
LHR8:40 amLondon Heathrow
17h 56m
2 stops
SEA6:36 pmSeattle/Tacoma Intl
Oct 22
SEA2:55 pmSeattle/Tacoma Intl
14h 25m
1 stop
LHR1:20 pmLondon Heathrow
$613
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Lufthansa flights from London Heathrow Airport to Seattle

Our best Lufthansa deals on London Heathrow Airport to Seattle flight tickets
Lufthansa
Oct 17
LHR6:30 amLondon Heathrow
13h 25m
1 stop
SEA11:55 amSeattle/Tacoma Intl
Oct 20
SEA2:20 pmSeattle/Tacoma Intl
12h 20m
1 stop
LHR10:40 amLondon Heathrow
$616
Find similar
Lufthansa
Oct 25
LHR2:10 pmLondon Heathrow
12h 26m
1 stop
SEA6:36 pmSeattle/Tacoma Intl
Nov 3
SEA3:40 pmSeattle/Tacoma Intl
12h 10m
1 stop
LHR11:50 amLondon Heathrow
$631
Find similar
Lufthansa
Mar 7
LHR4:40 pmLondon Heathrow
28h 40m
1 stop
SEA1:20 pmSeattle/Tacoma Intl
Mar 14
SEA6:31 amSeattle/Tacoma Intl
17h 09m
2 stops
LHR6:40 amLondon Heathrow
$632
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from London Heathrow Airport to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated September 15, 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 10/17

6:40 am-2:00 pm

1 stop15h 20m

Seattle/Tacoma Intl

Fri 10/24

4:20 pm-3:35 pm

2 stops39h 15m

$603

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 3/10

9:25 am-12:30 pm

Nonstop10h 05m

Seattle/Tacoma Intl

Tue 3/17

10:01 am-6:50 am

1 stop13h 49m

$604

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 10/8

6:30 am-2:16 pm

2 stops15h 46m

Seattle/Tacoma Intl

Tue 10/14

10:00 am-9:35 am

2 stops15h 35m

$605

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 11/5

12:15 pm-5:00 pm

1 stop12h 45m

Seattle/Tacoma Intl

Sun 3/15

3:35 pm-10:50 am

1 stop12h 15m

$606

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 11/3

8:35 pm-5:00 pm

1 stop28h 25m

Seattle/Tacoma Intl

Sat 3/14

3:35 pm-7:30 pm

1 stop20h 55m

$609

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 10/17

6:55 am-4:59 pm

1 stop18h 04m

Seattle/Tacoma Intl

Mon 10/20

5:30 am-1:20 pm

1 stop23h 50m

$610

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 10/29

12:20 pm-3:45 pm

Nonstop10h 25m

Seattle/Tacoma Intl

Wed 11/5

4:48 pm-10:30 am

Nonstop9h 42m

$615

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 10/8

5:25 pm-7:50 pm

Nonstop10h 25m

Seattle/Tacoma Intl

Tue 10/14

5:35 pm-11:20 am

Nonstop9h 45m

$618

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 11/4

12:20 pm-2:48 pm

Nonstop10h 28m

Seattle/Tacoma Intl

Wed 3/11

5:40 pm-10:30 am

Nonstop9h 50m

$643

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 10/29

12:20 pm-3:45 pm

Nonstop10h 25m

Seattle/Tacoma Intl

Wed 11/5

6:00 am-6:25 am

1 stop16h 25m

$644

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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?

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 $646. 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 $685.

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 $780. 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 $1,017.

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

Flying to Seattle from London Heathrow Airport at noon is the least expensive time of day to depart. momondo users have found prices as low as $847 when looking at flights departing at noon. Flights to Seattle are more costly in the evening, with an average ticket price of $859. Departure times in the evening 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 $768 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 $694 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?

You could potentially save up to 11% on your flight if you consider stops on a London Heathrow Airport to Seattle flight.

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

As of September 2025, prices for London Heathrow Airport to Seattle flights are approximately 18% cheaper 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

$736

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 $736. The best round-trip flight deal from London Heathrow Airport to Seattle found on momondo in the last 72 hours is $688.
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 10h 00m, 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?

  • 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?

  • 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
Airline
Rating
Free Cancellation
Price
IcelandairPriceFrom $449Free CancellationRating
7.0
544 reviews
Search Icelandair flights
British AirwaysPriceFrom $560Free CancellationRating
6.6
7,361 reviews
Search British Airways flights
Virgin AtlanticPriceFrom $594Free CancellationRating
7.4
664 reviews
Search Virgin Atlantic flights
American AirlinesPriceFrom $620Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
DeltaPriceFrom $621Free CancellationRating
7.9
7,954 reviews
Search Delta flights

  • Delta Flights From London Heathrow Airport to Seattle

    Delta flies from London Heathrow Airport to Seattle around 14 times per week, with 7,954 momondo users rating the airline 7.9/10. The cheapest Delta deal from London Heathrow Airport to Seattle in the last 72 hours was $621 (round-trip), much lower than the average airfare cost of $820 for Delta flights on this route.

  • Virgin Atlantic Flights From London Heathrow Airport to Seattle

    Virgin Atlantic (7.4/10 from 664 reviews) operates around 14 flights from London Heathrow Airport to Seattle in any given week. The average Virgin Atlantic airfare for this route is around $901, 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.

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Leavenworth
Tacoma
SeaTac
Ocean Shores
Renton
Olympia
Lynnwood
Kent
Marysville
Puyallup
Federal Way
Kirkland
Tukwila
Shoreline
Lakewood
Centralia
Fife
Cle Elum
Redmond
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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