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Cheap flights from Seattle to London from C$ 488

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 28/1. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult

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Cheap round-trip flights

Enter your travel dates to find the best prices.
Icelandair Logo
3:35 p.m. - 10:55 a.m.
SEA
-
LGW
12h 20m1 stop
Icelandair Logo
3:40 p.m. - 8:40 p.m.
LGW
-
SEA
13h 00m1 stop
C$ 796Icelandair
Sun, 22 Mar - Tue, 31 Mar
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$ 818Icelandair
Tue, 14 Apr - Thu, 23 Apr
Icelandair Logo
7:00 p.m. - 2:40 p.m.
SEA
-
LGW
11h 40m1 stop
Icelandair Logo
3:40 p.m. - 5:55 p.m.
LGW
-
SEA
34h 15m1 stop
C$ 820Icelandair
Sun, 12 Apr - Sun, 19 Apr
Icelandair Logo
7:00 p.m. - 2:40 p.m.
SEA
-
LGW
11h 40m1 stop
Icelandair Logo
1:00 p.m. - 5:55 p.m.
LGW
-
SEA
12h 55m1 stop
C$ 827Icelandair
Fri, 24 Apr - Sat, 2 May
Icelandair Logo
2:35 p.m. - 10:55 a.m.
SEA
-
LGW
12h 20m1 stop
Icelandair Logo
11:55 a.m. - 6:00 p.m.
LGW
-
SEA
13h 05m1 stop
C$ 829Icelandair
Sat, 7 Mar - Fri, 20 Mar
Icelandair Logo
7:00 p.m. - 2:40 p.m.
SEA
-
LGW
11h 40m1 stop
Icelandair Logo
1:00 p.m. - 5:55 p.m.
LGW
-
SEA
12h 55m1 stop
C$ 836Icelandair
Fri, 1 May - Sun, 10 May
SWISS Logo
12:35 p.m. - 5:50 p.m.
SEA
-
LGW
21h 15m2 stops
SWISS Logo
6:40 p.m. - 9:12 p.m.
LGW
-
SEA
34h 32m2 stops
C$ 874SWISS
Fri, 30 Jan - Fri, 6 Feb
Multiple Airlines Logo
11:10 p.m. - 10:00 a.m.
SEA
-
LGW
26h 50m1 stop
Multiple Airlines Logo
2:00 p.m. - 10:33 a.m.
LGW
-
SEA
28h 33m1 stop
C$ 889Multiple Airlines
Sun, 25 Jan - Thu, 29 Jan
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$ 941Icelandair
Sat, 4 Apr - Mon, 13 Apr
Icelandair Logo
3:35 p.m. - 10:55 a.m.
SEA
-
LGW
12h 20m1 stop
Icelandair Logo
3:40 p.m. - 8:40 p.m.
LGW
-
SEA
13h 00m1 stop
C$ 944Icelandair
Thu, 19 Mar - Tue, 31 Mar

Icelandair flights from Seattle to London Gatwick Airport

Our best Icelandair deals on Seattle to London Gatwick Airport flight tickets
Icelandair
12 Jan
SEA2:35 p.m.Seattle/Tacoma Intl
12h 20m
1 stop
LGW10:55 a.m.London Gatwick
25 Jan
LGW11:55 a.m.London Gatwick
13h 05m
1 stop
SEA5:00 p.m.Seattle/Tacoma Intl
C$ 796
Find similar
Icelandair
14 Apr
SEA7:00 p.m.Seattle/Tacoma Intl
11h 40m
1 stop
LGW2:40 p.m.London Gatwick
23 Apr
LGW3:40 p.m.London Gatwick
13h 00m
1 stop
SEA8:40 p.m.Seattle/Tacoma Intl
C$ 818
Find similar
Icelandair
12 Apr
SEA7:00 p.m.Seattle/Tacoma Intl
11h 40m
1 stop
LGW2:40 p.m.London Gatwick
19 Apr
LGW3:40 p.m.London Gatwick
34h 15m
1 stop
SEA5:55 p.m.Seattle/Tacoma Intl
C$ 820
Find similar

SWISS flights from Seattle to London Gatwick Airport

Our best SWISS deals on Seattle to London Gatwick Airport flight tickets
SWISS
30 Jan
SEA12:35 p.m.Seattle/Tacoma Intl
21h 15m
2 stops
LGW5:50 p.m.London Gatwick
6 Feb
LGW6:40 p.m.London Gatwick
34h 32m
2 stops
SEA9:12 p.m.Seattle/Tacoma Intl
C$ 874
Find similar
SWISS
13 Apr
SEA10:55 a.m.Seattle/Tacoma Intl
37h 25m
2 stops
LGW8:20 a.m.London Gatwick
6 May
LGW9:25 a.m.London Gatwick
19h 32m
2 stops
SEA8:57 p.m.Seattle/Tacoma Intl
C$ 973
Find similar
SWISS
9 Jan
SEA12:35 p.m.Seattle/Tacoma Intl
21h 15m
2 stops
LGW5:50 p.m.London Gatwick
21 Jan
LGW6:40 p.m.London Gatwick
36h 03m
2 stops
SEA10:43 p.m.Seattle/Tacoma Intl
C$ 1,080
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 18 December 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

Sun 22/3

3:35 p.m.-10:55 a.m.

1 stop12h 20m

London Gatwick

Tue 31/3

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

1 stop13h 00m

C$ 796

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Tue 14/4

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

1 stop11h 40m

London Gatwick

Thu 23/4

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

1 stop13h 00m

C$ 818

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Sun 12/4

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

1 stop11h 40m

London Gatwick

Sun 19/4

3:40 p.m.-5:55 p.m.

1 stop34h 15m

C$ 820

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Fri 24/4

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

1 stop11h 40m

London Gatwick

Sat 2/5

1:00 p.m.-5:55 p.m.

1 stop12h 55m

C$ 827

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Sat 7/3

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

1 stop12h 20m

London Gatwick

Fri 20/3

11:55 a.m.-6:00 p.m.

1 stop13h 05m

C$ 829

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Fri 1/5

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

1 stop11h 40m

London Gatwick

Sun 10/5

1:00 p.m.-5:55 p.m.

1 stop12h 55m

C$ 836

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Fri 30/1

12:35 p.m.-5:50 p.m.

2 stops21h 15m

London Gatwick

Fri 6/2

6:40 p.m.-9:12 p.m.

2 stops34h 32m

C$ 874

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Sun 25/1

11:10 p.m.-10:00 a.m.

1 stop26h 50m

London Gatwick

Thu 29/1

2:00 p.m.-10:33 a.m.

1 stop28h 33m

C$ 889

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Sat 4/4

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

1 stop11h 40m

London Gatwick

Mon 13/4

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

1 stop13h 00m

C$ 941

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Thu 19/3

3:35 p.m.-10:55 a.m.

1 stop12h 20m

London Gatwick

Tue 31/3

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

1 stop13h 00m

C$ 944

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 November, then departing from Seattle during the month January is also very affordable. Most momondo users find prices during this month for around C$ 767.

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$ 780. 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$ 1,218.

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

Fastest flight time

11h 40m

Direct flights

None
The fastest flight from Seattle to London Gatwick Airport takes 11h 40m
There are no direct flights from Seattle to London Gatwick Airport. There are no popular flight routes from Seattle to 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 40m.

  • 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
Hounslow
Ipswich
Dartford
Gatwick
Ilford
Chelmsford
Wokingham
Slough
Feltham
Hayes
Uxbridge
Wembley
Waterlooville
Newport
Basingstoke
Milton Keynes
Dover
Worthing
Maidstone
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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