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Cheap flights from Seattle to London from C$ 334

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 1/10. 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 Seattle to London

Cheap round-trip flights

Icelandair Logo
3:45 p.m. - 11:45 a.m.SEA-LGW
12h 00m1 stop
Icelandair Logo
3:40 p.m. - 5:50 p.m.LGW-SEA
34h 10m1 stop
C$ 705Icelandair
Find Deal
Mon, 18 Aug - Tue, 26 Aug
SWISS Logo
4:25 p.m. - 5:50 p.m.SEA-LGW
17h 25m1 stop
SWISS Logo
6:35 p.m. - 6:36 p.m.LGW-SEA
32h 01m2 stops
C$ 706SWISS
Find Deal
Mon, 8 Sep - Tue, 16 Sep
Icelandair Logo
3:45 p.m. - 11:45 a.m.SEA-LGW
12h 00m1 stop
Icelandair Logo
3:40 p.m. - 5:50 p.m.LGW-SEA
34h 10m1 stop
C$ 708Icelandair
Find Deal
Mon, 18 Aug - Sun, 31 Aug
SWISS Logo
4:25 p.m. - 5:50 p.m.SEA-LGW
17h 25m1 stop
SWISS Logo
6:35 p.m. - 6:36 p.m.LGW-SEA
32h 01m2 stops
C$ 709SWISS
Find Deal
Mon, 11 Aug - Mon, 18 Aug
Icelandair Logo
7:00 p.m. - 2:40 p.m.SEA-LGW
11h 40m1 stop
Icelandair Logo
3:40 p.m. - 8:40 p.m.LGW-SEA
13h 00m1 stop
C$ 712Icelandair
Find Deal
Sun, 5 Oct - Wed, 15 Oct
Icelandair Logo
3:45 p.m. - 2:40 p.m.SEA-LGW
14h 55m1 stop
Icelandair Logo
3:40 p.m. - 8:40 p.m.LGW-SEA
13h 00m1 stop
C$ 713Icelandair
Find Deal
Fri, 3 Oct - Tue, 7 Oct
Icelandair Logo
2:35 p.m. - 10:55 a.m.SEA-LGW
12h 20m1 stop
Icelandair Logo
11:55 a.m. - 5:00 p.m.LGW-SEA
13h 05m1 stop
C$ 715Icelandair
Find Deal
Sun, 23 Nov - Fri, 5 Dec
Icelandair Logo
3:45 p.m. - 2:40 p.m.SEA-LGW
14h 55m1 stop
Icelandair Logo
3:40 p.m. - 5:50 p.m.LGW-SEA
34h 10m1 stop
C$ 716Icelandair
Find Deal
Wed, 1 Oct - Wed, 8 Oct
Delta Logo
7:18 a.m. - 10:00 a.m.SEA-LGW
18h 42m1 stop
Delta Logo
12:00 p.m. - 4:38 p.m.LGW-SEA
36h 38m2 stops
C$ 848Delta
Find Deal
Tue, 12 Aug - Fri, 22 Aug
Logo
5:24 a.m. - 8:10 a.m.SEA-LGW
18h 46m2 stops
Logo
3:05 p.m. - 9:19 a.m.LGW-SEA
26h 14m2 stops
C$ 851
Find Deal
Mon, 1 Sep - Mon, 8 Sep

SWISS flights from Seattle to London Gatwick Airport

Our best SWISS deals on Seattle to London Gatwick Airport flight tickets
SWISS
8 Sep
SEA4:25 p.m.Seattle/Tacoma Intl
17h 25m
1 stop
LGW5:50 p.m.London Gatwick
16 Sep
LGW6:35 p.m.London Gatwick
32h 01m
2 stops
SEA6:36 p.m.Seattle/Tacoma Intl
C$ 706
Find similar
SWISS
11 Aug
SEA4:25 p.m.Seattle/Tacoma Intl
17h 25m
1 stop
LGW5:50 p.m.London Gatwick
18 Aug
LGW6:35 p.m.London Gatwick
32h 01m
2 stops
SEA6:36 p.m.Seattle/Tacoma Intl
C$ 709
Find similar
SWISS
11 Aug
SEA4:25 p.m.Seattle/Tacoma Intl
17h 25m
1 stop
LGW5:50 p.m.London Gatwick
25 Aug
LGW6:35 p.m.London Gatwick
36h 24m
2 stops
SEA10:59 p.m.Seattle/Tacoma Intl
C$ 721
Find similar

Icelandair flights from Seattle to London Gatwick Airport

Our best Icelandair deals on Seattle to London Gatwick Airport flight tickets
Icelandair
18 Aug
SEA3:45 p.m.Seattle/Tacoma Intl
12h 00m
1 stop
LGW11:45 a.m.London Gatwick
26 Aug
LGW3:40 p.m.London Gatwick
34h 10m
1 stop
SEA5:50 p.m.Seattle/Tacoma Intl
C$ 705
Find similar
Icelandair
18 Aug
SEA3:45 p.m.Seattle/Tacoma Intl
12h 00m
1 stop
LGW11:45 a.m.London Gatwick
31 Aug
LGW3:40 p.m.London Gatwick
34h 10m
1 stop
SEA5:50 p.m.Seattle/Tacoma Intl
C$ 708
Find similar
Icelandair
5 Oct
SEA7:00 p.m.Seattle/Tacoma Intl
11h 40m
1 stop
LGW2:40 p.m.London Gatwick
15 Oct
LGW3:40 p.m.London Gatwick
13h 00m
1 stop
SEA8:40 p.m.Seattle/Tacoma Intl
C$ 712
Find similar

momondo Fare Finder

 
Customize 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 96,600 searches. Data last updated 31 July 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

Mon 18/8

3:45 p.m.-11:45 a.m.

1 stop12h 00m

London Gatwick

Tue 26/8

3:40 p.m.-5:50 p.m.

1 stop34h 10m

C$ 705

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Mon 8/9

4:25 p.m.-5:50 p.m.

1 stop17h 25m

London Gatwick

Tue 16/9

6:35 p.m.-6:36 p.m.

2 stops32h 01m

C$ 706

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Mon 18/8

3:45 p.m.-11:45 a.m.

1 stop12h 00m

London Gatwick

Sun 31/8

3:40 p.m.-5:50 p.m.

1 stop34h 10m

C$ 708

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Mon 11/8

4:25 p.m.-5:50 p.m.

1 stop17h 25m

London Gatwick

Mon 18/8

6:35 p.m.-6:36 p.m.

2 stops32h 01m

C$ 709

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Sun 5/10

7:00 p.m.-2:40 p.m.

1 stop11h 40m

London Gatwick

Wed 15/10

3:40 p.m.-8:40 p.m.

1 stop13h 00m

C$ 712

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Fri 3/10

3:45 p.m.-2:40 p.m.

1 stop14h 55m

London Gatwick

Tue 7/10

3:40 p.m.-8:40 p.m.

1 stop13h 00m

C$ 713

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Sun 23/11

2:35 p.m.-10:55 a.m.

1 stop12h 20m

London Gatwick

Fri 5/12

11:55 a.m.-5:00 p.m.

1 stop13h 05m

C$ 715

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Wed 1/10

3:45 p.m.-2:40 p.m.

1 stop14h 55m

London Gatwick

Wed 8/10

3:40 p.m.-5:50 p.m.

1 stop34h 10m

C$ 716

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Tue 12/8

7:18 a.m.-10:00 a.m.

1 stop18h 42m

London Gatwick

Fri 22/8

12:00 p.m.-4:38 p.m.

2 stops36h 38m

C$ 848

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Mon 1/9

5:24 a.m.-8:10 a.m.

2 stops18h 46m

London Gatwick

Mon 8/9

3:05 p.m.-9:19 a.m.

2 stops26h 14m

C$ 851

Flights are sorted by cheapest round-trip 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?

If you are unable to visit London Gatwick Airport during the month of January, then departing from Seattle during the month April is also very affordable. Most momondo users find prices during this month for around C$ 783.

What is the cheapest day to depart on your flight to London Gatwick Airport?

The cheapest day to depart on your flight to London Gatwick Airport is on a Sunday when prices can be found for as low as C$ 781. This is often the case because there is less demand to fly during this day of the week. On the other hand, Thursday is the most expensive day to depart from Seattle because it is more convenient for both business and leisure travellers. As a result, prices tend to be around C$ 1,219.

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 round-trip 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

Best price found

C$ 334

Fastest flight time

11h 35m

Direct flights

None
The best one-way flight to London Gatwick Airport from Seattle in the past 72 hours is C$ 334. The best round-trip flight deal from Seattle to London Gatwick Airport found on momondo in the last 72 hours is C$ 705.
The fastest flight from Seattle to London Gatwick Airport takes 11h 35m
There are no direct flights from Seattle to London Gatwick Airport. Popular non-direct route for this connection is Seattle/Tacoma Intl Airport - London Gatwick Airport.
Search flight deals

  • How far is Seattle/Tacoma Intl to London Gatwick by plane?

    Seattle/Tacoma Intl and London Gatwick are 7722.7 km apart from one another. A reasonable flight in good conditions will take 11h 35m.

  • 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 updated daily.

  • 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
Ipswich
Hounslow
Gatwick
Dartford
Canterbury
Crawley
Ilford
Wembley
Maidstone
Chelmsford
Wokingham
Feltham
Uxbridge
Waterlooville
Newport
Basingstoke
Milton Keynes
Dover
Worthing
Guildford

Why use momondo?

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

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 Seattle to London for you.

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

All flight searches from Seattle to London on momondo can be filtered to show those which offer flexible booking policies.

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

Once all potential Seattle to London flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

If you are simply researching potential flights to London, momondo offers a useful price alert feature which will track prices for flights to London from Seattle and alert you when they change.

An easier way to manage your London Gatwick Airport trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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