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Cheap flights from Seattle to London from £261

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to London departing on 4/12. 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

Enter your travel dates to find the best prices.
Icelandair Logo
19:00 - 14:40SEA-LGW
11h 40m1 stop
Icelandair Logo
15:40 - 20:45LGW-SEA
13h 05m1 stop
£402Icelandair
Find Deal
Sat, 4 Apr - Thu, 16 Apr
Icelandair Logo
15:35 - 10:55SEA-LGW
12h 20m1 stop
Icelandair Logo
15:40 - 20:45LGW-SEA
13h 05m1 stop
£402Icelandair
Find Deal
Mon, 16 Mar - Sun, 5 Apr
Multiple Airlines Logo
14:35 - 21:05SEA-LGW
22h 30m2 stops
Multiple Airlines Logo
08:50 - 17:00LGW-SEA
16h 10m2 stops
£403Multiple Airlines
Find Deal
Wed, 10 Dec - Wed, 24 Dec
Icelandair Logo
15:35 - 10:55SEA-LGW
12h 20m1 stop
Icelandair Logo
15:40 - 17:50LGW-SEA
34h 10m1 stop
£404Icelandair
Find Deal
Wed, 18 Mar - Wed, 1 Apr
Icelandair Logo
19:00 - 14:40SEA-LGW
11h 40m1 stop
Icelandair Logo
15:40 - 20:45LGW-SEA
13h 05m1 stop
£405Icelandair
Find Deal
Sat, 4 Apr - Fri, 10 Apr
Icelandair Logo
14:35 - 10:55SEA-LGW
12h 20m1 stop
Icelandair Logo
11:55 - 17:00LGW-SEA
13h 05m1 stop
£406Icelandair
Find Deal
Mon, 1 Dec - Fri, 5 Dec
Icelandair Logo
19:00 - 14:40SEA-LGW
11h 40m1 stop
Icelandair Logo
13:00 - 17:50LGW-SEA
12h 50m1 stop
£407Icelandair
Find Deal
Tue, 21 Apr - Tue, 12 May
Icelandair Logo
19:00 - 14:40SEA-LGW
11h 40m1 stop
Icelandair Logo
15:40 - 20:45LGW-SEA
13h 05m1 stop
£408Icelandair
Find Deal
Mon, 6 Apr - Thu, 7 May
Multiple Airlines Logo
14:35 - 23:20SEA-LGW
24h 45m2 stops
Multiple Airlines Logo
06:45 - 17:00LGW-SEA
18h 15m2 stops
£409Multiple Airlines
Find Deal
Sun, 30 Nov - Tue, 9 Dec
Icelandair Logo
15:45 - 14:40SEA-LGW
14h 55m1 stop
Icelandair Logo
13:00 - 18:00LGW-SEA
13h 00m1 stop
£411Icelandair
Find Deal
Sun, 26 Apr - Tue, 19 May

Icelandair flights from Seattle to London Gatwick Airport

Our best Icelandair deals on Seattle to London Gatwick Airport flight tickets
Icelandair
4 Apr
SEA19:00Seattle/Tacoma Intl
11h 40m
1 stop
LGW14:40London Gatwick
16 Apr
LGW15:40London Gatwick
13h 05m
1 stop
SEA20:45Seattle/Tacoma Intl
£402
Find similar
Icelandair
16 Mar
SEA15:35Seattle/Tacoma Intl
12h 20m
1 stop
LGW10:55London Gatwick
5 Apr
LGW15:40London Gatwick
13h 05m
1 stop
SEA20:45Seattle/Tacoma Intl
£402
Find similar
Icelandair
18 Mar
SEA15:35Seattle/Tacoma Intl
12h 20m
1 stop
LGW10:55London Gatwick
1 Apr
LGW15:40London Gatwick
34h 10m
1 stop
SEA17:50Seattle/Tacoma Intl
£404
Find similar

SWISS flights from Seattle to London Gatwick Airport

Our best SWISS deals on Seattle to London Gatwick Airport flight tickets
SWISS
15 Nov
SEA14:41Seattle/Tacoma Intl
19h 09m
2 stops
LGW17:50London Gatwick
22 Nov
LGW18:40London Gatwick
35h 48m
2 stops
SEA22:28Seattle/Tacoma Intl
£581
Find similar
SWISS
9 Nov
SEA15:37Seattle/Tacoma Intl
18h 13m
2 stops
LGW17:50London Gatwick
16 Nov
LGW18:40London Gatwick
35h 48m
2 stops
SEA22:28Seattle/Tacoma Intl
£586
Find similar

momondo Fare Finder

 
Customise your flight search to find flights from Seattle to London Gatwick Airport 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 279,928 searches. Data last updated 5 November 2025.
Use the filters below to find and compare flights from Seattle to London Gatwick Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Sat 4/4

19:00-14:40

1 stop11h 40m

London Gatwick

Thu 16/4

15:40-20:45

1 stop13h 05m

£402

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Mon 16/3

15:35-10:55

1 stop12h 20m

London Gatwick

Sun 5/4

15:40-20:45

1 stop13h 05m

£402

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Wed 10/12

14:35-21:05

2 stops22h 30m

London Gatwick

Wed 24/12

08:50-17:00

2 stops16h 10m

£403

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Wed 18/3

15:35-10:55

1 stop12h 20m

London Gatwick

Wed 1/4

15:40-17:50

1 stop34h 10m

£404

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Sat 4/4

19:00-14:40

1 stop11h 40m

London Gatwick

Fri 10/4

15:40-20:45

1 stop13h 05m

£405

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Mon 1/12

14:35-10:55

1 stop12h 20m

London Gatwick

Fri 5/12

11:55-17:00

1 stop13h 05m

£406

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Tue 21/4

19:00-14:40

1 stop11h 40m

London Gatwick

Tue 12/5

13:00-17:50

1 stop12h 50m

£407

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Mon 6/4

19:00-14:40

1 stop11h 40m

London Gatwick

Thu 7/5

15:40-20:45

1 stop13h 05m

£408

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Sun 30/11

14:35-23:20

2 stops24h 45m

London Gatwick

Tue 9/12

06:45-17:00

2 stops18h 15m

£409

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Sun 26/4

15:45-14:40

1 stop14h 55m

London Gatwick

Tue 19/5

13:00-18:00

1 stop13h 00m

£411

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 London from

How to get the cheapest flight ticket from Seattle to London Gatwick Airport

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 London Gatwick Airport?

The cheapest month to fly to London Gatwick Airport from Seattle is in January. Flight prices, which tend to average around £431, are often lower during this time because this is during the off-season. If you don’t want to visit London Gatwick Airport in January, then you should wait until April to fly from Seattle, when ticket prices are also cheap, with an average price of £434.

When to book flights from Seattle to London Gatwick Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Seattle to London Gatwick Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated return price

Cheap Seattle to London Gatwick Airport (SEA to LGW) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to London Gatwick Airport

Direct flights

None
There are no direct flights from Seattle to London Gatwick Airport. There are no popular flight routes from Seattle to London Gatwick Airport.
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  • How far is Seattle/Tacoma Intl to London Gatwick by plane?

    The straight-line distance from Seattle/Tacoma Intl to London Gatwick is 4798.7 mi. 11h 40m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to London Gatwick Airport?

    Prices for flights from Seattle/Tacoma Intl Airport to London Gatwick Airport are refreshed on a daily basis.

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

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to London Gatwick Airport.

  • What documentation or ID do you need to fly to London Gatwick Airport?

    The travel and health documents you'll need for your trip to London Gatwick 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 license and a passport that is valid for six months after your intended arrival at London Gatwick Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Eastbourne
Milton Keynes
Luton
Gatwick
Maidstone
Slough
Canterbury
Southend-on-Sea
Ipswich
Ilford
Guildford
Dover
Colchester
Chelmsford
Hayes
Worthing
Ramsgate
Dartford
Bedford
Winchester

Why use momondo?

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

It is quick and easy to find Seattle to London flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to London that suits you.

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

Yes. momondo allows you to filter the results for Seattle to London flights to just show those with flexible booking policies.

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Seattle to London.

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

Yes momondo offers price alerts on flights to London from Seattle. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your London Gatwick Airport trip

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