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Cheap flights from London to Seattle from C$ 518

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 16/1. 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 to Seattle

Cheap round-trip flights

These are some of the best round-trip flight deals from London to Seattle that have been recently found on momondo from popular airlines, departing in the coming months.

Cheap one-way flights

Flying one-way? These are some of the best deals recently discovered on momondo for flights from London to Seattle.

Cheap last-minute flights

Planning a quick getaway from London to Seattle? These are the last-minute flight deals available now.

Cheap direct flights

If you prefer a non-stop journey, check out our latest direct flight deals to Seattle, so you can enjoy a seamless trip without layovers.

Cheap bus & train deals from London to Seattle

Find recent round-trip train or bus tickets from London to Seattle.

All round-trip flight deals to Seattle

The cheapest plane tickets to Seattle found on KAYAK recently.
2:50 p.m. - 2:21 p.m.LHR-SEA
31h 31m1 stop
3:15 p.m. - 12:50 p.m.SEA-LHR
13h 35m1 stop
C$ 777WestJet
Find Deal
Thu, 16 Jan - Mon, 20 Jan
12:15 p.m. - 5:00 p.m.LHR-SEA
12h 45m1 stop
2:35 p.m. - 10:50 a.m.SEA-LHR
12h 15m1 stop
C$ 830Icelandair
Find Deal
Mon, 13 Jan - Sat, 18 Jan
6:30 a.m. - 11:45 a.m.LHR-SEA
13h 15m1 stop
5:45 p.m. - 11:10 a.m.SEA-LHR
9h 25mdirect
C$ 843Delta
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Wed, 12 Feb - Wed, 19 Feb
6:30 a.m. - 11:50 a.m.LHR-SEA
13h 20m1 stop
7:00 p.m. - 12:40 p.m.SEA-LHR
9h 40mdirect
C$ 846Delta
Find Deal
Wed, 15 Jan - Wed, 22 Jan
1:00 p.m. - 10:00 p.m.LHR-SEA
17h 00m1 stop
5:45 a.m. - 10:10 a.m.SEA-LHR
20h 25m1 stop
C$ 946United Airlines
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Wed, 12 Feb - Tue, 25 Feb
11:10 a.m. - 9:30 p.m.LHR-SEA
18h 20m1 stop
10:35 a.m. - 10:10 a.m.SEA-LHR
15h 35m1 stop
C$ 951United Airlines
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Wed, 8 Jan - Thu, 16 Jan
9:25 a.m. - 11:20 a.m.LHR-SEA
9h 55mdirect
1:35 p.m. - 7:00 a.m.SEA-LHR
9h 25mdirect
C$ 965British Airways
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Tue, 11 Feb - Tue, 25 Feb
9:25 a.m. - 11:20 a.m.LHR-SEA
9h 55mdirect
6:50 p.m. - 12:15 p.m.SEA-LHR
9h 25mdirect
C$ 972British Airways
Find Deal
Tue, 11 Feb - Wed, 19 Feb
9:25 a.m. - 11:20 a.m.LHR-SEA
9h 55mdirect
6:50 p.m. - 12:15 p.m.SEA-LHR
9h 25mdirect
C$ 974Finnair
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Tue, 14 Jan - Mon, 20 Jan
3:00 p.m. - 4:55 p.m.LHR-SEA
9h 55mdirect
6:50 p.m. - 12:15 p.m.SEA-LHR
9h 25mdirect
C$ 977Finnair
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Wed, 12 Feb - Mon, 24 Feb
2:50 p.m. - 2:21 p.m.LHR-SEA
31h 31m1 stop
C$ 518WestJet
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Thu, 16 Jan
2:50 p.m. - 2:21 p.m.LHR-SEA
31h 31m1 stop
C$ 519WestJet
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Thu, 16 Jan
8:00 p.m. - 2:21 p.m.LHR-SEA
50h 21m2 stops
C$ 575
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Wed, 15 Jan
2:50 p.m. - 2:21 p.m.LHR-SEA
31h 31m1 stop
C$ 637WestJet
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Wed, 15 Jan
2:50 p.m. - 10:00 a.m.LHR-SEA
27h 10m2 stops
C$ 703WestJet
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Fri, 31 Jan
2:50 p.m. - 2:38 p.m.LHR-SEA
31h 48m1 stop
C$ 732WestJet
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Fri, 17 Jan
12:15 p.m. - 5:00 p.m.LHR-SEA
12h 45m1 stop
C$ 907Icelandair
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Wed, 27 Nov
3:00 p.m. - 4:55 p.m.LHR-SEA
9h 55mdirect
C$ 925Aer Lingus
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Wed, 15 Jan
7:40 a.m. - 1:20 p.m.LHR-SEA
13h 40m1 stop
C$ 983Lufthansa
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Tue, 26 Nov
6:00 a.m. - 5:00 p.m.LHR-SEA
19h 00m3 stops
C$ 1,134
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Wed, 15 Jan
1:45 p.m. - 7:13 p.m.LHR-SEA
37h 28m1 stop
6:05 a.m. - 11:50 a.m.SEA-LHR
21h 45m1 stop
C$ 883United Airlines
Find Deal
Sat, 23 Nov - Mon, 25 Nov
1:45 p.m. - 7:13 p.m.LHR-SEA
37h 28m1 stop
6:05 a.m. - 11:50 a.m.SEA-LHR
21h 45m1 stop
C$ 885United Airlines
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Sat, 23 Nov - Mon, 25 Nov
1:00 p.m. - 8:36 a.m.LHR-SEA
27h 36m2 stops
8:05 a.m. - 11:50 a.m.SEA-LHR
19h 45m2 stops
C$ 890United Airlines
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Sat, 23 Nov - Mon, 25 Nov
12:15 p.m. - 5:00 p.m.LHR-SEA
12h 45m1 stop
2:35 p.m. - 10:50 a.m.SEA-LHR
12h 15m1 stop
C$ 1,089Icelandair
Find Deal
Mon, 25 Nov - Mon, 13 Jan
12:15 p.m. - 5:00 p.m.LHR-SEA
12h 45m1 stop
2:35 p.m. - 7:30 p.m.SEA-LHR
20h 55m1 stop
C$ 1,156Icelandair
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Sun, 24 Nov - Thu, 28 Nov
1:15 p.m. - 3:15 p.m.LHR-SEA
10h 00mdirect
5:45 p.m. - 11:10 a.m.SEA-LHR
9h 25mdirect
C$ 1,158Delta
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Mon, 25 Nov - Mon, 2 Dec
12:40 p.m. - 10:25 p.m.LHR-SEA
17h 45m1 stop
5:45 p.m. - 11:10 a.m.SEA-LHR
9h 25mdirect
C$ 1,180Delta
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Mon, 25 Nov - Sat, 11 Jan
6:40 a.m. - 10:23 p.m.LHR-SEA
23h 43m2 stops
2:00 p.m. - 9:40 p.m.SEA-LHR
23h 40m2 stops
C$ 1,194Scandinavian Airlines
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Mon, 25 Nov - Sat, 11 Jan
10:20 a.m. - 11:02 p.m.LHR-SEA
20h 42m2 stops
7:10 a.m. - 9:20 a.m.SEA-LHR
18h 10m2 stops
C$ 1,277Scandinavian Airlines
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Sat, 23 Nov - Mon, 25 Nov
6:35 a.m. - 5:05 p.m.LHR-SEA
18h 30m1 stop
7:00 p.m. - 9:05 p.m.SEA-LHR
18h 05m1 stop
C$ 1,313Turkish Airlines
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Sat, 23 Nov - Sun, 1 Dec
1:15 p.m. - 3:15 p.m.LHR-SEA
10h 00mdirect
7:05 p.m. - 12:40 p.m.SEA-LHR
9h 35mdirect
C$ 890Delta
Find Deal
Wed, 12 Feb - Wed, 19 Feb
3:50 p.m. - 6:25 p.m.LHR-SEA
10h 35mdirect
7:00 p.m. - 12:40 p.m.SEA-LHR
9h 40mdirect
C$ 895Delta
Find Deal
Wed, 15 Jan - Wed, 22 Jan
9:25 a.m. - 11:20 a.m.LHR-SEA
9h 55mdirect
6:50 p.m. - 12:15 p.m.SEA-LHR
9h 25mdirect
C$ 965British Airways
Find Deal
Tue, 11 Feb - Thu, 20 Feb
9:25 a.m. - 11:20 a.m.LHR-SEA
9h 55mdirect
6:50 p.m. - 12:15 p.m.SEA-LHR
9h 25mdirect
C$ 972British Airways
Find Deal
Tue, 11 Feb - Wed, 19 Feb
9:25 a.m. - 11:20 a.m.LHR-SEA
9h 55mdirect
6:50 p.m. - 12:15 p.m.SEA-LHR
9h 25mdirect
C$ 974Finnair
Find Deal
Tue, 14 Jan - Mon, 20 Jan
3:00 p.m. - 4:55 p.m.LHR-SEA
9h 55mdirect
6:50 p.m. - 12:15 p.m.SEA-LHR
9h 25mdirect
C$ 977Finnair
Find Deal
Wed, 12 Feb - Mon, 24 Feb
3:50 p.m. - 6:30 p.m.LHR-SEA
10h 40mdirect
6:55 p.m. - 12:40 p.m.SEA-LHR
9h 45mdirect
C$ 1,377KLM
Find Deal
Wed, 4 Dec - Wed, 25 Dec
1:05 p.m. - 3:05 p.m.LHR-SEA
10h 00mdirect
5:45 p.m. - 11:10 a.m.SEA-LHR
9h 25mdirect
C$ 1,683Air France
Find Deal
Sat, 14 Dec - Thu, 2 Jan
1:05 p.m. - 3:05 p.m.LHR-SEA
10h 00mdirect
5:45 p.m. - 11:10 a.m.SEA-LHR
9h 25mdirect
C$ 1,685Air France
Find Deal
Sat, 14 Dec - Thu, 2 Jan
3:50 p.m. - 6:30 p.m.LHR-SEA
10h 40mdirect
7:30 p.m. - 1:10 p.m.SEA-LHR
9h 40mdirect
C$ 1,978KLM
Find Deal
Wed, 4 Dec - Fri, 20 Dec

Icelandair flights from London to Seattle

Our best Icelandair deals on London to Seattle flight tickets
Icelandair
13 Jan
LHR12:15 p.m.London Heathrow
12h 45m
1 stop
SEA5:00 p.m.Seattle/Tacoma Intl
18 Jan
SEA2:35 p.m.Seattle/Tacoma Intl
12h 15m
1 stop
LHR10:50 a.m.London Heathrow
Icelandair
17 Jan
LHR12:15 p.m.London Heathrow
12h 45m
1 stop
SEA5:00 p.m.Seattle/Tacoma Intl
20 Jan
SEA2:35 p.m.Seattle/Tacoma Intl
20h 55m
1 stop
LHR7:30 p.m.London Heathrow
Icelandair
27 Nov
LHR12:15 p.m.London Heathrow
12h 45m
1 stop
SEA5:00 p.m.Seattle/Tacoma Intl
2 Dec
SEA2:35 p.m.Seattle/Tacoma Intl
20h 55m
1 stop
LHR7:30 p.m.London Heathrow

United Airlines flights from London to Seattle

Our best United Airlines deals on London to Seattle flight tickets
United Airlines
23 Nov
LHR1:45 p.m.London Heathrow
37h 28m
1 stop
SEA7:13 p.m.Seattle/Tacoma Intl
25 Nov
SEA6:05 a.m.Seattle/Tacoma Intl
16h 25m
1 stop
LHR6:30 a.m.London Heathrow
United Airlines
23 Nov
LHR1:00 p.m.London Heathrow
27h 36m
2 stops
SEA8:36 a.m.Seattle/Tacoma Intl
25 Nov
SEA6:05 a.m.Seattle/Tacoma Intl
18h 25m
1 stop
LHR8:30 a.m.London Heathrow
United Airlines
12 Feb
LHR1:00 p.m.London Heathrow
17h 00m
1 stop
SEA10:00 p.m.Seattle/Tacoma Intl
25 Feb
SEA5:45 a.m.Seattle/Tacoma Intl
20h 25m
1 stop
LHR10:10 a.m.London Heathrow

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 from London to Seattle?

January. The cheapest time of year to fly to Seattle from London is January. The most expensive is August.

What is the cheapest day to depart London for Seattle?

Monday. The cheapest day of the week is typically Monday. The most expensive is typically Saturday

When is the cheapest time to fly from London to Seattle?

In the morning. London to Seattle flights are approximately 24% more expensive in the afternoon than in the morning

What is the cheapest London to Seattle flight route?

London Heathrow - Seattle/Tacoma Intl. Fly from London Heathrow to Seattle/Tacoma Intl for the best London - Seattle flight prices

How far in advance should you book London to Seattle flights?

43 days before. The cheapest time to buy a flight from London to Seattle is approximately 43 days to departure

Can stopping save me money on London to Seattle flights?

You could potentially save up to 44% 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 2024, prices for London to Seattle flights are approximately 5% more expensive when compared to flights at the same time last year.

What is the typical price of a round-trip flight between London and Seattle?


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 round-trip 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

C$ 518

Fastest flight time

9h 55m

Direct flights

Every day

Airports in Seattle

1 airport
The best one-way flight to Seattle from London in the past 72 hours is C$ 518. The best round-trip flight deal from London to Seattle found on momondo in the last 72 hours is C$ 777.
The fastest flight from London to Seattle takes 9h 55m
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?

    The straight-line distance from London to Seattle/Tacoma Intl is 7694.7 km. In terms of flight time, this usually takes a little over 9h 55m.

  • 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 refresh daily.

  • 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 layovers. 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 required for your trip to Seattle/Tacoma Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Seattle/Tacoma Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular plane model from London to Seattle?


Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from London to Seattle . Millions of users trust and use momondo every year so you are in good hands.

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

Yes. momondo enables you to select and highlight flights to Seattle from London with this policy.

How can momondo help me find flights from London to Seattle?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Seattle from London.

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

Yes. momondo can track prices for London to Seattle flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.


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