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Cheap flights from London to Seattle from €459

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 12/3. 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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Cheap return flights

Virgin Atlantic Logo
17:25 - 19:50LHR-SEA
10h 25mdirect
Virgin Atlantic Logo
20:25 - 14:15SEA-LHR
9h 50mdirect
€511Virgin Atlantic
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Mon, 29 Sep - Mon, 13 Oct
SWISS Logo
06:00 - 21:15LHR-SEA
23h 15m2 stops
SWISS Logo
13:00 - 17:50SEA-LHR
20h 50m2 stops
€514SWISS
Find Deal
Sun, 28 Sep - Wed, 15 Oct
United Airlines Logo
15:30 - 13:10LHR-SEA
28h 40m1 stop
United Airlines Logo
08:36 - 10:25SEA-LHR
17h 49m2 stops
€516United Airlines
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Thu, 30 Oct - Tue, 4 Nov
Lufthansa Logo
20:15 - 13:20LHR-SEA
25h 05m1 stop
Lufthansa Logo
10:05 - 10:10SEA-LHR
16h 05m2 stops
€517Lufthansa
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Tue, 6 Jan - Tue, 10 Feb
United Airlines Logo
06:30 - 11:55LHR-SEA
13h 25m1 stop
United Airlines Logo
05:50 - 11:50SEA-LHR
22h 00m1 stop
€523United Airlines
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Sun, 19 Oct - Sun, 23 Nov
United Airlines Logo
14:10 - 18:36LHR-SEA
12h 26m1 stop
United Airlines Logo
14:55 - 13:20SEA-LHR
14h 25m1 stop
€524United Airlines
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Mon, 29 Sep - Mon, 13 Oct
Icelandair Logo
12:15 - 17:00LHR-SEA
12h 45m1 stop
Icelandair Logo
14:35 - 10:50SEA-LHR
12h 15m1 stop
€528Icelandair
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Tue, 2 Dec - Tue, 20 Jan
Delta Logo
06:30 - 11:45LHR-SEA
13h 15m1 stop
Delta Logo
19:20 - 12:50SEA-LHR
9h 30mdirect
€528Delta
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Tue, 18 Nov - Thu, 4 Dec
Delta Logo
06:30 - 11:45LHR-SEA
13h 15m1 stop
Delta Logo
17:35 - 11:20SEA-LHR
9h 45mdirect
€531Delta
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Mon, 29 Sep - Mon, 13 Oct
Icelandair Logo
12:15 - 17:00LHR-SEA
12h 45m1 stop
Icelandair Logo
14:35 - 10:50SEA-LHR
12h 15m1 stop
€556Icelandair
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Sun, 7 Dec - Sat, 17 Jan

SWISS flights from London to Seattle

Our best SWISS deals on London to Seattle flight tickets
SWISS
28 Sept
LHR06:00London Heathrow
23h 15m
2 stops
SEA21:15Seattle/Tacoma Intl
15 Oct
SEA13:00Seattle/Tacoma Intl
20h 50m
2 stops
LHR17:50London Heathrow
€514
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SWISS
28 Sept
LHR06:00London Heathrow
23h 15m
2 stops
SEA21:15Seattle/Tacoma Intl
4 Dec
SEA15:25Seattle/Tacoma Intl
18h 25m
2 stops
LHR17:50London Heathrow
€543
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SWISS
23 Jan
LGW18:40London Gatwick
34h 32m
2 stops
SEA21:12Seattle/Tacoma Intl
30 Jan
SEA12:35Seattle/Tacoma Intl
21h 15m
2 stops
LGW17:50London Gatwick
€664
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Delta flights from London to Seattle

Our best Delta deals on London to Seattle flight tickets
Delta
18 Nov
LHR06:30London Heathrow
13h 15m
1 stop
SEA11:45Seattle/Tacoma Intl
3 Dec
SEA16:50Seattle/Tacoma Intl
9h 40m
LHR10:30London Heathrow
€528
Find similar
Delta
29 Sept
LHR06:30London Heathrow
13h 15m
1 stop
SEA11:45Seattle/Tacoma Intl
15 Oct
SEA17:35Seattle/Tacoma Intl
9h 45m
LHR11:20London Heathrow
€529
Find similar
Delta
29 Sept
LHR06:30London Heathrow
13h 15m
1 stop
SEA11:45Seattle/Tacoma Intl
13 Oct
SEA17:35Seattle/Tacoma Intl
9h 45m
LHR11:20London Heathrow
€531
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momondo Fare Finder

 
Customise your flight search to find flights from London 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 13,528 searches. Data last updated 17 September 2025.
Use the filters below to find and compare flights from London to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 29/9

17:25-19:50

Nonstop10h 25m

Seattle/Tacoma Intl

Mon 13/10

20:25-14:15

Nonstop9h 50m

€511

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 28/9

06:00-21:15

2 stops23h 15m

Seattle/Tacoma Intl

Wed 15/10

13:00-17:50

2 stops20h 50m

€514

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 30/10

15:30-13:10

1 stop28h 40m

Seattle/Tacoma Intl

Tue 4/11

08:36-10:25

2 stops17h 49m

€516

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 6/1

20:15-13:20

1 stop25h 05m

Seattle/Tacoma Intl

Tue 10/2

10:05-10:10

2 stops16h 05m

€517

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 19/10

06:30-11:55

1 stop13h 25m

Seattle/Tacoma Intl

Sun 23/11

05:50-11:50

1 stop22h 00m

€523

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 29/9

14:10-18:36

1 stop12h 26m

Seattle/Tacoma Intl

Mon 13/10

14:55-13:20

1 stop14h 25m

€524

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 2/12

12:15-17:00

1 stop12h 45m

Seattle/Tacoma Intl

Tue 20/1

14:35-10:50

1 stop12h 15m

€528

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 18/11

06:30-11:45

1 stop13h 15m

Seattle/Tacoma Intl

Thu 4/12

19:20-12:50

Nonstop9h 30m

€528

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 29/9

06:30-11:45

1 stop13h 15m

Seattle/Tacoma Intl

Mon 13/10

17:35-11:20

Nonstop9h 45m

€531

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 7/12

12:15-17:00

1 stop12h 45m

Seattle/Tacoma Intl

Sat 17/1

14:35-10:50

1 stop12h 15m

€556

Flights are sorted by cheapest return 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 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 and Seattle?

What is the cheapest month to fly to Seattle?

If you’re not able to fly to Seattle in January, then February is your next best option. Flight prices from London to Seattle during February average around €558.

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 €648 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from London for as low as €586 on momondo.

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

There are 2 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.

Can stopping save me money on London to Seattle flights?

You could potentially save up to 46% on your flight if you consider stops on a London to Seattle flight.

How have London to Seattle flight prices changed over time?

As of September 2025, prices for London to Seattle flights are approximately 3% cheaper 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 return 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

Fastest flight time

9h 45m

Direct flights

Every day

Airports in Seattle

1 airport
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)
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  • How far is London to Seattle/Tacoma Intl by plane?

    Seattle/Tacoma Intl is 7694.7 km away from London. 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 were last updated today.

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

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and stopovers. It is recommended that you verify with the airline you are booking with for 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 licence 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?

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Aberdeen
Lynnwood

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from London to Seattle for you.

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

Flights from London to Seattle 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 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.

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

If you are not ready to book a flight from London to Seattle now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Seattle and let you know when they change.

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