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Cheap flights from London to Seattle from €301

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 4/11. 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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0 bags
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Find the cheapest flights from London to Seattle (LON-SEA)

Cheap return flights

Aer Lingus Logo
08:50 - 17:50LHR-SEA
17h 00m1 stop
Aer Lingus Logo
19:35 - 20:20SEA-LHR
16h 45m1 stop
€471Aer Lingus
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Wed, 3 Sep - Thu, 11 Sep
United Airlines Logo
16:15 - 13:30LHR-SEA
29h 15m2 stops
United Airlines Logo
12:15 - 10:10SEA-LHR
13h 55m1 stop
€493United Airlines
Find Deal
Sat, 13 Sep - Mon, 15 Sep
Icelandair Logo
15:40 - 20:40LGW-SEA
13h 00m1 stop
Icelandair Logo
19:00 - 14:40SEA-LGW
11h 40m1 stop
€495Icelandair
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Sat, 4 Oct - Tue, 7 Oct
Scandinavian Airlines Logo
19:50 - 14:00LHR-SEA
26h 10m2 stops
Scandinavian Airlines Logo
16:20 - 17:40SEA-LHR
17h 20m1 stop
€495Scandinavian Airlines
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Thu, 2 Oct - Sun, 5 Oct
Icelandair Logo
15:40 - 17:50LGW-SEA
34h 10m1 stop
Icelandair Logo
19:00 - 14:35SEA-LGW
11h 35m1 stop
€496Icelandair
Find Deal
Tue, 30 Sep - Mon, 6 Oct
Scandinavian Airlines Logo
19:50 - 14:00LHR-SEA
26h 10m2 stops
Scandinavian Airlines Logo
16:20 - 19:55SEA-LHR
19h 35m2 stops
€500Scandinavian Airlines
Find Deal
Thu, 2 Oct - Sun, 5 Oct
Virgin Atlantic Logo
17:35 - 11:15LHR-SEA
25h 40m1 stop
Virgin Atlantic Logo
17:35 - 11:20SEA-LHR
9h 45mdirect
€559Virgin Atlantic
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Mon, 29 Sep - Mon, 13 Oct
Lufthansa Logo
09:00 - 16:59LHR-SEA
15h 59m1 stop
Lufthansa Logo
15:40 - 11:50SEA-LHR
12h 10m1 stop
€569Lufthansa
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Sun, 19 Oct - Sun, 9 Nov
Lufthansa Logo
14:10 - 22:16LHR-SEA
16h 06m1 stop
Lufthansa Logo
14:55 - 13:20SEA-LHR
14h 25m1 stop
€571Lufthansa
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Sat, 27 Sep - Thu, 9 Oct
Virgin Atlantic Logo
12:00 - 23:15LGW-SEA
19h 15m1 stop
Virgin Atlantic Logo
06:00 - 10:00SEA-LGW
20h 00m2 stops
€654Virgin Atlantic
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Sat, 30 Aug - Sat, 6 Sep

Icelandair flights from London to Seattle

Our best Icelandair deals on London to Seattle flight tickets
Icelandair
25 Aug
LGW15:40London Gatwick
13h 00m
1 stop
SEA20:40Seattle/Tacoma Intl
9 Sept
SEA19:00Seattle/Tacoma Intl
11h 40m
1 stop
LGW14:40London Gatwick
€474
Find similar
Icelandair
25 Aug
LHR21:25London Heathrow
22h 00m
1 stop
SEA11:25Seattle/Tacoma Intl
9 Sept
SEA23:30Seattle/Tacoma Intl
12h 50m
1 stop
LHR20:20London Heathrow
€477
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Icelandair
4 Oct
LGW15:40London Gatwick
13h 00m
1 stop
SEA20:40Seattle/Tacoma Intl
6 Oct
SEA15:45Seattle/Tacoma Intl
14h 50m
1 stop
LGW14:35London Gatwick
€495
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Lufthansa flights from London to Seattle

Our best Lufthansa deals on London to Seattle flight tickets
Lufthansa
19 Oct
LHR09:00London Heathrow
15h 59m
1 stop
SEA16:59Seattle/Tacoma Intl
9 Nov
SEA15:40Seattle/Tacoma Intl
12h 10m
1 stop
LHR11:50London Heathrow
€569
Find similar
Lufthansa
27 Sept
LHR14:10London Heathrow
16h 06m
1 stop
SEA22:16Seattle/Tacoma Intl
9 Oct
SEA14:55Seattle/Tacoma Intl
14h 25m
1 stop
LHR13:20London Heathrow
€571
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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 August 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

Wed 3/9

08:50-17:50

1 stop17h 00m

Seattle/Tacoma Intl

Thu 11/9

19:35-20:20

1 stop16h 45m

€471

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 13/9

16:15-13:30

2 stops29h 15m

Seattle/Tacoma Intl

Mon 15/9

12:15-10:10

1 stop13h 55m

€493

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Sat 4/10

15:40-20:40

1 stop13h 00m

Seattle/Tacoma Intl

Tue 7/10

19:00-14:40

1 stop11h 40m

€495

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 2/10

19:50-14:00

2 stops26h 10m

Seattle/Tacoma Intl

Sun 5/10

16:20-17:40

1 stop17h 20m

€495

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Tue 30/9

15:40-17:50

1 stop34h 10m

Seattle/Tacoma Intl

Mon 6/10

19:00-14:35

1 stop11h 35m

€496

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 2/10

19:50-14:00

2 stops26h 10m

Seattle/Tacoma Intl

Sun 5/10

16:20-19:55

2 stops19h 35m

€500

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 29/9

17:35-11:15

1 stop25h 40m

Seattle/Tacoma Intl

Mon 13/10

17:35-11:20

Nonstop9h 45m

€559

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 19/10

09:00-16:59

1 stop15h 59m

Seattle/Tacoma Intl

Sun 9/11

15:40-11:50

1 stop12h 10m

€569

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 27/9

14:10-22:16

1 stop16h 06m

Seattle/Tacoma Intl

Thu 9/10

14:55-13:20

1 stop14h 25m

€571

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Sat 30/8

12:00-23:15

1 stop19h 15m

Seattle/Tacoma Intl

Sat 6/9

06:00-10:00

2 stops20h 00m

€654

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 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 €562.

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 €660 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 €602 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 25% 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 August 2025, prices for London to Seattle flights are approximately 9% 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

€301

Fastest flight time

10h 00m

Direct flights

Every day

Airports in Seattle

1 airport
The best one-way flight to Seattle from London in the past 72 hours is €301. The best return flight deal from London to Seattle found on momondo in the last 72 hours is €471.
The fastest flight from London to Seattle takes 10h 00m
Direct flights go from London to Seattle every day.
There is 1 airport near Seattle: Seattle/Tacoma Intl (SEA)
Search flight deals

  • 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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