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Cheap flights from London Heathrow Airport to Seattle from $416

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 11/11. 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

Lufthansa Logo
7:25 am - 4:59 pmLHR-SEA
17h 34m1 stop
Lufthansa Logo
2:20 pm - 4:40 pmSEA-LHR
18h 20m1 stop
$456Lufthansa
Find Deal
Fri, Sep 12 - Sun, Sep 21
Icelandair Logo
9:25 pm - 11:25 amLHR-SEA
22h 00m1 stop
Icelandair Logo
3:45 pm - 11:55 amSEA-LHR
12h 10m1 stop
$535Icelandair
Find Deal
Sat, Sep 13 - Sat, Sep 20
Aer Lingus Logo
8:50 am - 5:50 pmLHR-SEA
17h 00m1 stop
Aer Lingus Logo
7:35 pm - 3:55 pmSEA-LHR
12h 20m1 stop
$539Aer Lingus
Find Deal
Wed, Aug 27 - Wed, Sep 10
Icelandair Logo
1:05 pm - 5:50 pmLHR-SEA
12h 45m1 stop
Icelandair Logo
3:45 pm - 8:20 pmSEA-LHR
20h 35m1 stop
$547Icelandair
Find Deal
Wed, Sep 10 - Tue, Sep 30
Lufthansa Logo
6:30 am - 11:55 amLHR-SEA
13h 25m1 stop
Lufthansa Logo
2:20 pm - 12:40 pmSEA-LHR
14h 20m1 stop
$548Lufthansa
Find Deal
Mon, Sep 8 - Tue, Sep 23
Icelandair Logo
9:25 pm - 5:50 pmLHR-SEA
28h 25m1 stop
Icelandair Logo
3:45 pm - 11:55 amSEA-LHR
12h 10m1 stop
$549Icelandair
Find Deal
Sat, Sep 27 - Mon, Oct 6
Icelandair Logo
1:05 pm - 8:40 pmLHR-SEA
15h 35m1 stop
Icelandair Logo
3:45 pm - 11:55 amSEA-LHR
12h 10m1 stop
$550Icelandair
Find Deal
Fri, Sep 12 - Sat, Sep 20
Icelandair Logo
9:25 pm - 11:25 amLHR-SEA
22h 00m1 stop
Icelandair Logo
3:45 pm - 11:55 amSEA-LHR
12h 10m1 stop
$551Icelandair
Find Deal
Mon, Sep 1 - Mon, Sep 15
Scandinavian Airlines Logo
10:20 am - 2:00 pmLHR-SEA
35h 40m1 stop
Scandinavian Airlines Logo
4:20 pm - 9:20 pmSEA-LHR
45h 00m2 stops
$568Scandinavian Airlines
Find Deal
Tue, Oct 7 - Wed, Oct 15
Scandinavian Airlines Logo
9:05 pm - 1:50 pmLHR-SEA
24h 45m2 stops
Scandinavian Airlines Logo
4:20 pm - 9:20 amSEA-LHR
33h 00m1 stop
$569Scandinavian Airlines
Find Deal
Thu, Aug 28 - Fri, Sep 12

Icelandair flights from London Heathrow Airport to Seattle

Our best Icelandair deals on London Heathrow Airport to Seattle flight tickets
Icelandair
Sep 13
LHR9:25 pmLondon Heathrow
22h 00m
1 stop
SEA11:25 amSeattle/Tacoma Intl
Sep 20
SEA3:45 pmSeattle/Tacoma Intl
12h 10m
1 stop
LHR11:55 amLondon Heathrow
$535
Find similar
Icelandair
Sep 10
LHR1:05 pmLondon Heathrow
12h 45m
1 stop
SEA5:50 pmSeattle/Tacoma Intl
Sep 30
SEA3:45 pmSeattle/Tacoma Intl
20h 35m
1 stop
LHR8:20 pmLondon Heathrow
$547
Find similar
Icelandair
Sep 27
LHR9:25 pmLondon Heathrow
28h 25m
1 stop
SEA5:50 pmSeattle/Tacoma Intl
Oct 6
SEA3:45 pmSeattle/Tacoma Intl
12h 10m
1 stop
LHR11:55 amLondon Heathrow
$549
Find similar

Virgin Atlantic flights from London Heathrow Airport to Seattle

Our best Virgin Atlantic deals on London Heathrow Airport to Seattle flight tickets
Virgin Atlantic
Aug 13
LHR5:25 pmLondon Heathrow
10h 20m
SEA7:45 pmSeattle/Tacoma Intl
Aug 25
SEA8:25 pmSeattle/Tacoma Intl
9h 50m
LHR2:15 pmLondon Heathrow
$715
Find similar
Virgin Atlantic
Aug 13
LHR5:25 pmLondon Heathrow
10h 20m
SEA7:45 pmSeattle/Tacoma Intl
Aug 25
SEA8:25 pmSeattle/Tacoma Intl
9h 50m
LHR2:15 pmLondon Heathrow
$755
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 July 31, 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 9/12

7:25 am-4:59 pm

1 stop17h 34m

Seattle/Tacoma Intl

Sun 9/21

2:20 pm-4:40 pm

1 stop18h 20m

$456

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 9/13

9:25 pm-11:25 am

1 stop22h 00m

Seattle/Tacoma Intl

Sat 9/20

3:45 pm-11:55 am

1 stop12h 10m

$535

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 8/27

8:50 am-5:50 pm

1 stop17h 00m

Seattle/Tacoma Intl

Wed 9/10

7:35 pm-3:55 pm

1 stop12h 20m

$539

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 9/10

1:05 pm-5:50 pm

1 stop12h 45m

Seattle/Tacoma Intl

Tue 9/30

3:45 pm-8:20 pm

1 stop20h 35m

$547

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 9/8

6:30 am-11:55 am

1 stop13h 25m

Seattle/Tacoma Intl

Tue 9/23

2:20 pm-12:40 pm

1 stop14h 20m

$548

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 9/27

9:25 pm-5:50 pm

1 stop28h 25m

Seattle/Tacoma Intl

Mon 10/6

3:45 pm-11:55 am

1 stop12h 10m

$549

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 9/12

1:05 pm-8:40 pm

1 stop15h 35m

Seattle/Tacoma Intl

Sat 9/20

3:45 pm-11:55 am

1 stop12h 10m

$550

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 9/1

9:25 pm-11:25 am

1 stop22h 00m

Seattle/Tacoma Intl

Mon 9/15

3:45 pm-11:55 am

1 stop12h 10m

$551

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 10/7

10:20 am-2:00 pm

1 stop35h 40m

Seattle/Tacoma Intl

Wed 10/15

4:20 pm-9:20 pm

2 stops45h 00m

$568

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 8/28

9:05 pm-1:50 pm

2 stops24h 45m

Seattle/Tacoma Intl

Fri 9/12

4:20 pm-9:20 am

1 stop33h 00m

$569

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 $648. If you don’t want to visit Seattle in February, then you should wait until November to fly from London Heathrow Airport, when ticket prices are also cheap, with an average price of $691.

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 $791. 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 $1,145.

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 $845 when looking at flights departing at noon. Flights to Seattle are more costly in the morning, with an average ticket price of $894. 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 $778 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 $704 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 July 2025, prices for London Heathrow Airport to Seattle flights are approximately 2% 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

$416

Fastest flight time

12h 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 $416. The best round-trip flight deal from London Heathrow Airport to Seattle found on momondo in the last 72 hours is $456.
The fastest flight from London Heathrow Airport to Seattle takes 12h 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 12h 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?

  • 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
520 reviews
Search Icelandair flights
British AirwaysPriceFrom $560Free CancellationRating
6.6
7,222 reviews
Search British Airways flights
IberiaPriceFrom $575Free CancellationRating
7.0
2,859 reviews
Search Iberia flights
Virgin AtlanticPriceFrom $594Free CancellationRating
7.4
655 reviews
Search Virgin Atlantic flights
American AirlinesPriceFrom $620Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
DeltaPriceFrom $632Free CancellationRating
8.0
7,981 reviews
Search Delta flights

  • Delta Flights From London Heathrow Airport to Seattle

    Delta flies from London Heathrow Airport to Seattle around 12 times per week, with 7,981 momondo users rating the airline 8.0/10. The cheapest Delta deal from London Heathrow Airport to Seattle in the last 72 hours was $632 (round-trip), much lower than the average airfare cost of $852 for Delta flights on this route.

  • Virgin Atlantic Flights From London Heathrow Airport to Seattle

    Virgin Atlantic (7.4/10 from 655 reviews) operates around 12 flights from London Heathrow Airport to Seattle in any given week. The average Virgin Atlantic airfare for this route is around $918, 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
Olympia
Renton
Kent
Federal Way
Puyallup
Lynnwood
Marysville
Tukwila
Kirkland
Lakewood
Fife
Centralia
Cle Elum
Shoreline
Westport
Redmond

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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