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Cheap flights from London to Seattle from €476

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 12/2. 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

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Multiple Airlines Logo
06:30 - 11:40LHR-SEA
13h 10m1 stop
Multiple Airlines Logo
16:55 - 10:30SEA-LHR
9h 35mdirect
€545Multiple Airlines
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Mon, 2 Feb - Tue, 10 Feb
Icelandair Logo
20:35 - 17:00LHR-SEA
28h 25m1 stop
Icelandair Logo
14:35 - 10:50SEA-LHR
12h 15m1 stop
€546Icelandair
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Tue, 16 Dec - Thu, 15 Jan
Icelandair Logo
20:35 - 17:00LHR-SEA
28h 25m1 stop
Icelandair Logo
14:35 - 19:30SEA-LHR
20h 55m1 stop
€547Icelandair
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Tue, 16 Dec - Thu, 15 Jan
Multiple Airlines Logo
06:30 - 11:35LHR-SEA
13h 05m1 stop
Multiple Airlines Logo
20:20 - 12:50SEA-LHR
9h 30mdirect
€555Multiple Airlines
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Tue, 3 Mar - Tue, 10 Mar
Virgin Atlantic Logo
06:30 - 12:20LHR-SEA
37h 50m2 stops
Virgin Atlantic Logo
21:59 - 06:55SEA-LHR
24h 56m1 stop
€556Virgin Atlantic
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Wed, 21 Jan - Sat, 24 Jan
Virgin Atlantic Logo
12:20 - 14:45LHR-SEA
10h 25mdirect
Virgin Atlantic Logo
16:55 - 10:30SEA-LHR
9h 35mdirect
€557Virgin Atlantic
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Mon, 2 Feb - Tue, 10 Feb
British Airways Logo
14:55 - 16:55LHR-SEA
10h 00mdirect
British Airways Logo
13:39 - 11:35SEA-LHR
13h 56m1 stop
€561British Airways
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Fri, 13 Feb - Thu, 19 Feb
Delta Logo
12:20 - 14:53LHR-SEA
10h 33mdirect
Delta Logo
22:59 - 06:25SEA-LHR
23h 26m1 stop
€566Delta
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Wed, 21 Jan - Sat, 24 Jan
Icelandair Logo
12:15 - 17:00LHR-SEA
12h 45m1 stop
Icelandair Logo
14:35 - 10:50SEA-LHR
12h 15m1 stop
€571Icelandair
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Thu, 27 Nov - Mon, 1 Dec
Icelandair Logo
12:15 - 17:00LHR-SEA
12h 45m1 stop
Icelandair Logo
14:35 - 10:50SEA-LHR
12h 15m1 stop
€572Icelandair
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Thu, 27 Nov - Mon, 1 Dec

British Airways flights from London to Seattle

Our best British Airways deals on London to Seattle flight tickets
British Airways
13 Feb
LHR14:55London Heathrow
10h 00m
SEA16:55Seattle/Tacoma Intl
19 Feb
SEA13:39Seattle/Tacoma Intl
13h 56m
1 stop
LHR11:35London Heathrow
€561
Find similar
British Airways
26 Apr
LHR09:50London Heathrow
9h 45m
SEA11:35Seattle/Tacoma Intl
17 May
SEA07:00Seattle/Tacoma Intl
19h 30m
1 stop
LHR10:30London Heathrow
€597
Find similar
British Airways
15 Nov
LHR14:10London Heathrow
17h 08m
1 stop
SEA23:18Seattle/Tacoma Intl
29 Nov
SEA13:35Seattle/Tacoma Intl
9h 35m
LHR07:10London Heathrow
€621
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United Airlines flights from London to Seattle

Our best United Airlines deals on London to Seattle flight tickets
United Airlines
2 Feb
LHR06:30London Heathrow
13h 40m
1 stop
SEA12:10Seattle/Tacoma Intl
10 Feb
SEA10:58Seattle/Tacoma Intl
16h 17m
1 stop
LHR11:15London Heathrow
€596
Find similar
United Airlines
3 Mar
LHR06:30London Heathrow
13h 40m
1 stop
SEA12:10Seattle/Tacoma Intl
10 Mar
SEA08:30Seattle/Tacoma Intl
17h 40m
2 stops
LHR09:10London Heathrow
€599
Find similar
United Airlines
2 Dec
LHR06:30London Heathrow
13h 40m
1 stop
SEA12:10Seattle/Tacoma Intl
9 Dec
SEA07:00Seattle/Tacoma Intl
20h 15m
1 stop
LHR11:15London Heathrow
€613
Find similar

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 13 November 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 2/2

06:30-11:40

1 stop13h 10m

Seattle/Tacoma Intl

Tue 10/2

16:55-10:30

Nonstop9h 35m

€545

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 16/12

20:35-17:00

1 stop28h 25m

Seattle/Tacoma Intl

Thu 15/1

14:35-10:50

1 stop12h 15m

€546

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 16/12

20:35-17:00

1 stop28h 25m

Seattle/Tacoma Intl

Thu 15/1

14:35-19:30

1 stop20h 55m

€547

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 3/3

06:30-11:35

1 stop13h 05m

Seattle/Tacoma Intl

Tue 10/3

20:20-12:50

Nonstop9h 30m

€555

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 21/1

06:30-12:20

2 stops37h 50m

Seattle/Tacoma Intl

Sat 24/1

21:59-06:55

1 stop24h 56m

€556

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 2/2

12:20-14:45

Nonstop10h 25m

Seattle/Tacoma Intl

Tue 10/2

16:55-10:30

Nonstop9h 35m

€557

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 13/2

14:55-16:55

Nonstop10h 00m

Seattle/Tacoma Intl

Thu 19/2

13:39-11:35

1 stop13h 56m

€561

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 21/1

12:20-14:53

Nonstop10h 33m

Seattle/Tacoma Intl

Sat 24/1

22:59-06:25

1 stop23h 26m

€566

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 27/11

12:15-17:00

1 stop12h 45m

Seattle/Tacoma Intl

Mon 1/12

14:35-10:50

1 stop12h 15m

€571

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 27/11

12:15-17:00

1 stop12h 45m

Seattle/Tacoma Intl

Mon 1/12

14:35-10:50

1 stop12h 15m

€572

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 €575.

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 €668 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 €612 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 71% 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 November 2025, prices for London to Seattle flights are approximately 13% more expensive 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)
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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