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Cheap flights from Seattle to London from $415

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 9/17. 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
0 bags

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Find the cheapest flights from Seattle to London

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
3:40 pm - 7:15 pm
SEA
-
LGW
19h 35m
2 stops
Multiple Airlines Logo
8:45 pm - 5:55 pm
LGW
-
SEA
29h 10m
3 stops
$610Multiple Airlines
Mon, Apr 20 - Mon, Apr 27
Multiple Airlines Logo
3:40 pm - 7:15 pm
SEA
-
LGW
19h 35m
2 stops
Multiple Airlines Logo
8:45 pm - 8:40 pm
LGW
-
SEA
31h 55m
3 stops
$611Multiple Airlines
Mon, Apr 20 - Mon, Apr 27
Multiple Airlines Logo
3:40 pm - 7:15 pm
SEA
-
LGW
19h 35m
2 stops
Multiple Airlines Logo
8:45 pm - 8:40 pm
LGW
-
SEA
31h 55m
3 stops
$612Multiple Airlines
Mon, Apr 20 - Mon, Apr 27
Multiple Airlines Logo
7:00 pm - 10:20 pm
SEA
-
LGW
19h 20m
2 stops
Multiple Airlines Logo
6:25 am - 8:40 pm
LGW
-
SEA
22h 15m
2 stops
$617Multiple Airlines
Tue, Apr 14 - Tue, Apr 28
Multiple Airlines Logo
7:00 pm - 10:20 pm
SEA
-
LGW
19h 20m
2 stops
Multiple Airlines Logo
6:25 am - 5:55 pm
LGW
-
SEA
19h 30m
2 stops
$618Multiple Airlines
Tue, Apr 21 - Tue, Apr 28
Multiple Airlines Logo
7:00 pm - 10:20 pm
SEA
-
LGW
19h 20m
2 stops
Multiple Airlines Logo
6:25 am - 8:40 pm
LGW
-
SEA
22h 15m
2 stops
$619Multiple Airlines
Tue, Apr 14 - Tue, Apr 21
Multiple Airlines Logo
7:00 pm - 7:15 pm
SEA
-
LGW
16h 15m
2 stops
Multiple Airlines Logo
8:50 am - 6:30 pm
LGW
-
SEA
41h 40m
3 stops
$621Multiple Airlines
Sun, Apr 19 - Tue, May 5
Multiple Airlines Logo
7:00 pm - 7:05 pm
SEA
-
LGW
16h 05m
2 stops
Multiple Airlines Logo
9:50 am - 7:20 pm
LGW
-
SEA
17h 30m
3 stops
$622Multiple Airlines
Sat, Apr 18 - Sun, Apr 26
Multiple Airlines Logo
7:00 pm - 7:15 pm
SEA
-
LGW
16h 15m
2 stops
Multiple Airlines Logo
9:50 am - 7:20 pm
LGW
-
SEA
17h 30m
3 stops
$623Multiple Airlines
Sun, Apr 19 - Sun, Apr 26
Multiple Airlines Logo
7:00 pm - 7:15 pm
SEA
-
LGW
16h 15m
2 stops
Multiple Airlines Logo
11:00 am - 8:40 pm
LGW
-
SEA
17h 40m
2 stops
$628Multiple Airlines
Thu, Apr 16 - Thu, Apr 23

Icelandair flights from Seattle to London Gatwick Airport

Our best Icelandair deals on Seattle to London Gatwick Airport flight tickets
Icelandair
Apr 21
SEA7:00 pmSeattle/Tacoma Intl
11h 40m
1 stop
LGW2:40 pmLondon Gatwick
Apr 27
LGW3:40 pmLondon Gatwick
13h 00m
1 stop
SEA8:40 pmSeattle/Tacoma Intl
$694
Icelandair
Apr 20
SEA7:00 pmSeattle/Tacoma Intl
11h 40m
1 stop
LGW2:40 pmLondon Gatwick
May 6
LGW3:40 pmLondon Gatwick
34h 15m
1 stop
SEA5:55 pmSeattle/Tacoma Intl
$697
Icelandair
Apr 26
SEA7:00 pmSeattle/Tacoma Intl
11h 40m
1 stop
LGW2:40 pmLondon Gatwick
May 12
LGW1:00 pmLondon Gatwick
15h 40m
1 stop
SEA8:40 pmSeattle/Tacoma Intl
$698

Delta flights from Seattle to London Gatwick Airport

Our best Delta deals on Seattle to London Gatwick Airport flight tickets
Delta
Apr 7
SEA1:30 pmSeattle/Tacoma Intl
11h 55m
1 stop
LGW9:25 amLondon Gatwick
Apr 14
LGW10:35 amLondon Gatwick
15h 03m
1 stop
SEA5:38 pmSeattle/Tacoma Intl
$911
Delta
Apr 7
SEA6:40 pmSeattle/Tacoma Intl
13h 20m
1 stop
LGW4:00 pmLondon Gatwick
Apr 20
LGW10:25 amLondon Gatwick
32h 50m
1 stop
SEA11:15 amSeattle/Tacoma Intl
$924

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 832,500 searches. Data last updated March 24, 2026.
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

Cheapest round-trip

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Mon 4/20

3:40 pm-7:15 pm

2 stops19h 35m

London Gatwick

Mon 4/27

8:45 pm-5:55 pm

3 stops29h 10m

$610

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Mon 4/20

3:40 pm-7:15 pm

2 stops19h 35m

London Gatwick

Mon 4/27

8:45 pm-8:40 pm

3 stops31h 55m

$611

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Mon 4/20

3:40 pm-7:15 pm

2 stops19h 35m

London Gatwick

Mon 4/27

8:45 pm-8:40 pm

3 stops31h 55m

$612

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Tue 4/14

7:00 pm-10:20 pm

2 stops19h 20m

London Gatwick

Tue 4/28

6:25 am-8:40 pm

2 stops22h 15m

$617

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Tue 4/21

7:00 pm-10:20 pm

2 stops19h 20m

London Gatwick

Tue 4/28

6:25 am-5:55 pm

2 stops19h 30m

$618

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Tue 4/14

7:00 pm-10:20 pm

2 stops19h 20m

London Gatwick

Tue 4/21

6:25 am-8:40 pm

2 stops22h 15m

$619

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Sun 4/19

7:00 pm-7:15 pm

2 stops16h 15m

London Gatwick

Tue 5/5

8:50 am-6:30 pm

3 stops41h 40m

$621
Quickest round-trip

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Sat 4/18

7:00 pm-7:05 pm

2 stops16h 05m

London Gatwick

Sun 4/26

9:50 am-7:20 pm

3 stops17h 30m

$622

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Sun 4/19

7:00 pm-7:15 pm

2 stops16h 15m

London Gatwick

Sun 4/26

9:50 am-7:20 pm

3 stops17h 30m

$623

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Thu 4/16

7:00 pm-7:15 pm

2 stops16h 15m

London Gatwick

Thu 4/23

11:00 am-8:40 pm

2 stops17h 40m

$628

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?

In general, November is the cheapest month to fly from Seattle to London Gatwick Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $519. 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 $541.

Can stopping save me money on Seattle to London Gatwick Airport flights?

You could potentially save up to 17% on your flight if you consider stops on a Seattle to London Gatwick Airport flight.

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 4798.7 mi apart from one another. In terms of flight time, this usually takes a little over 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 refreshed on a daily basis.

  • How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to London Gatwick Airport?

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check 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.

  • What is the most popular airline from Seattle to London Gatwick Airport?

Best airlines flying from Seattle to London Gatwick Airport

Compare and see reviews for airlines that fly from Seattle to London Gatwick Airport with momondo
Airline
Rating
Free Cancellation
Price
IcelandairPriceFrom $503Free CancellationRating
7.0
625 reviews
Search Icelandair flights

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Gatwick
Hounslow
Milton Keynes
Luton
Dover
Crawley
Slough
Wembley
Hayes
Croydon
Dartford
Brentwood
Guildford
Harrow
Cobham
Folkestone
Romford
Stansted
Watford
Richmond

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

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

Once you have performed a search for Seattle to London flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Price alerts on flights to London from Seattle are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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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