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Cheap flights from London to Seattle from €316

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 5/9. 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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0 bags
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Cheap return flights

Icelandair Logo
13:00 - 20:40LGW-SEA
15h 40m1 stop
Icelandair Logo
15:45 - 14:40SEA-LGW
14h 55m1 stop
€458Icelandair
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Sat, 6 Sep - Sat, 4 Oct
Icelandair Logo
15:40 - 20:40LGW-SEA
13h 00m1 stop
Icelandair Logo
19:00 - 14:40SEA-LGW
11h 40m1 stop
€464Icelandair
Find Deal
Tue, 9 Sep - Sun, 21 Sep
United Airlines Logo
13:25 - 13:28LHR-SEA
32h 03m2 stops
United Airlines Logo
07:00 - 07:55SEA-LHR
16h 55m1 stop
€486United Airlines
Find Deal
Sat, 8 Nov - Mon, 10 Nov
SWISS Logo
18:35 - 18:36LGW-SEA
32h 01m2 stops
SWISS Logo
13:05 - 17:55SEA-LGW
20h 50m2 stops
€544SWISS
Find Deal
Tue, 16 Sep - Wed, 24 Sep
SWISS Logo
20:05 - 14:50LHR-SEA
26h 45m1 stop
SWISS Logo
14:29 - 17:50SEA-LHR
19h 21m2 stops
€548SWISS
Find Deal
Fri, 12 Sep - Tue, 23 Sep
United Airlines Logo
07:40 - 13:20LHR-SEA
13h 40m1 stop
United Airlines Logo
08:00 - 09:10SEA-LHR
17h 10m2 stops
€548United Airlines
Find Deal
Sun, 30 Nov - Mon, 8 Dec
Scandinavian Airlines Logo
19:30 - 13:50LHR-SEA
26h 20m1 stop
Scandinavian Airlines Logo
16:00 - 17:40SEA-LHR
17h 40m1 stop
€553Scandinavian Airlines
Find Deal
Tue, 26 Aug - Sun, 31 Aug
Scandinavian Airlines Logo
19:30 - 13:50LHR-SEA
26h 20m1 stop
Scandinavian Airlines Logo
16:00 - 17:40SEA-LHR
17h 40m1 stop
€555Scandinavian Airlines
Find Deal
Tue, 26 Aug - Sun, 31 Aug
 Logo
10:45 - 21:36LGW-SEA
18h 51m1 stop
 Logo
10:08 - 10:55SEA-LGW
16h 47m1 stop
€555
Find Deal
Mon, 25 Aug - Wed, 10 Sep
 Logo
10:45 - 12:15LGW-SEA
33h 30m2 stops
 Logo
10:08 - 10:55SEA-LGW
16h 47m1 stop
€576
Find Deal
Mon, 25 Aug - Wed, 10 Sep

Delta flights from London to Seattle

Our best Delta deals on London to Seattle flight tickets
Delta
25 Aug
LHR08:40London Heathrow
15h 15m
1 stop
SEA15:55Seattle/Tacoma Intl
10 Sept
SEA20:25Seattle/Tacoma Intl
9h 50m
LHR14:15London Heathrow
Delta
3 Sept
LHR06:30London Heathrow
17h 35m
1 stop
SEA16:05Seattle/Tacoma Intl
17 Sept
SEA17:35Seattle/Tacoma Intl
9h 45m
LHR11:20London Heathrow
Delta
18 Aug
LHR17:25London Heathrow
10h 20m
SEA19:45Seattle/Tacoma Intl
5 Nov
SEA17:20Seattle/Tacoma Intl
9h 40m
LHR11:00London Heathrow

Icelandair flights from London to Seattle

Our best Icelandair deals on London to Seattle flight tickets
Icelandair
6 Sept
LGW13:00London Gatwick
15h 40m
1 stop
SEA20:40Seattle/Tacoma Intl
4 Oct
SEA15:45Seattle/Tacoma Intl
14h 55m
1 stop
LGW14:40London Gatwick
Icelandair
9 Sept
LGW15:40London Gatwick
13h 00m
1 stop
SEA20:40Seattle/Tacoma Intl
21 Sept
SEA19:00Seattle/Tacoma Intl
11h 40m
1 stop
LGW14:40London Gatwick
Icelandair
25 Aug
LGW15:40London Gatwick
27h 45m
1 stop
SEA11:25Seattle/Tacoma Intl
6 Sept
SEA19:00Seattle/Tacoma Intl
11h 40m
1 stop
LGW14:40London Gatwick

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 March is your next best option. Flight prices from London to Seattle during March average around €560.

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 €664 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 €596 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.

How have London to Seattle flight prices changed over time?

As of June 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

Best price found

€316

Fastest flight time

10h 05m

Direct flights

Every day

Airports in Seattle

1 airport
The best one-way flight to Seattle from London in the past 72 hours is €316. The best return flight deal from London to Seattle found on momondo in the last 72 hours is €458.
The fastest flight from London to Seattle takes 10h 05m
Direct flights go from London to Seattle every day.
There is 1 airport near Seattle: Seattle/Tacoma Intl (SEA)

  • 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 10h 05m, 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
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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