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Cheap flights from Seattle to London from $349

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 1/20. 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

Enter your travel dates to find the best prices.
Icelandair Logo
2:35 pm - 10:55 am
SEA
-
LGW
12h 20m1 stop
Icelandair Logo
11:55 am - 5:00 pm
LGW
-
SEA
13h 05m1 stop
$577Icelandair
Wed, Feb 11 - Mon, Feb 23
Icelandair Logo
2:35 pm - 10:55 am
SEA
-
LGW
12h 20m1 stop
Icelandair Logo
11:55 am - 6:00 pm
LGW
-
SEA
13h 05m1 stop
$578Icelandair
Fri, Mar 6 - Tue, Mar 10
Icelandair Logo
3:40 pm - 11:45 am
SEA
-
LGW
12h 05m1 stop
Icelandair Logo
3:40 pm - 8:40 pm
LGW
-
SEA
13h 00m1 stop
$579Icelandair
Fri, May 1 - Wed, May 20
Icelandair Logo
2:35 pm - 10:55 am
SEA
-
LGW
12h 20m1 stop
Icelandair Logo
11:55 am - 5:00 pm
LGW
-
SEA
13h 05m1 stop
$586Icelandair
Tue, Feb 10 - Tue, Feb 17
Icelandair Logo
7:00 pm - 2:40 pm
SEA
-
LGW
11h 40m1 stop
Icelandair Logo
3:40 pm - 8:40 pm
LGW
-
SEA
13h 00m1 stop
$587Icelandair
Sun, May 10 - Sat, May 16
Icelandair Logo
3:40 pm - 2:40 pm
SEA
-
LGW
15h 00m1 stop
Icelandair Logo
3:40 pm - 8:40 pm
LGW
-
SEA
13h 00m1 stop
$594Icelandair
Wed, Apr 8 - Fri, Apr 24
Icelandair Logo
2:35 pm - 10:55 am
SEA
-
LGW
12h 20m1 stop
Icelandair Logo
11:55 am - 6:00 pm
LGW
-
SEA
13h 05m1 stop
$599Icelandair
Fri, Mar 6 - Sat, Mar 14
Icelandair Logo
2:35 pm - 10:55 am
SEA
-
LGW
12h 20m1 stop
Icelandair Logo
11:55 am - 6:00 pm
LGW
-
SEA
13h 05m1 stop
$600Icelandair
Fri, Mar 6 - Wed, Mar 11
Icelandair Logo
2:35 pm - 10:55 am
SEA
-
LGW
12h 20m1 stop
Icelandair Logo
11:55 am - 5:00 pm
LGW
-
SEA
13h 05m1 stop
$602Icelandair
Tue, Feb 10 - Wed, Feb 18
Multiple Airlines Logo
2:35 pm - 9:45 pm
SEA
-
LGW
23h 10m2 stops
Multiple Airlines Logo
7:00 am - 5:00 pm
LGW
-
SEA
18h 00m2 stops
$603Multiple Airlines
Wed, Feb 4 - Wed, Feb 11

Icelandair flights from Seattle to London Gatwick Airport

Our best Icelandair deals on Seattle to London Gatwick Airport flight tickets
Icelandair
Feb 11
SEA2:35 pmSeattle/Tacoma Intl
12h 20m
1 stop
LGW10:55 amLondon Gatwick
Feb 23
LGW11:55 amLondon Gatwick
13h 05m
1 stop
SEA5:00 pmSeattle/Tacoma Intl
$577
Find similar
Icelandair
Mar 6
SEA2:35 pmSeattle/Tacoma Intl
12h 20m
1 stop
LGW10:55 amLondon Gatwick
Mar 10
LGW11:55 amLondon Gatwick
13h 05m
1 stop
SEA6:00 pmSeattle/Tacoma Intl
$578
Find similar
Icelandair
May 1
SEA3:40 pmSeattle/Tacoma Intl
12h 05m
1 stop
LGW11:45 amLondon Gatwick
May 16
LGW1:00 pmLondon Gatwick
15h 40m
1 stop
SEA8:40 pmSeattle/Tacoma Intl
$579
Find similar

SWISS flights from Seattle to London Gatwick Airport

Our best SWISS deals on Seattle to London Gatwick Airport flight tickets
SWISS
Jan 19
SEA10:58 amSeattle/Tacoma Intl
22h 52m
2 stops
LGW5:50 pmLondon Gatwick
Jan 26
LGW6:40 pmLondon Gatwick
34h 32m
2 stops
SEA9:12 pmSeattle/Tacoma Intl
$634
Find similar
SWISS
Jan 18
SEA10:58 amSeattle/Tacoma Intl
22h 52m
2 stops
LGW5:50 pmLondon Gatwick
Jan 31
LGW6:40 pmLondon Gatwick
36h 03m
2 stops
SEA10:43 pmSeattle/Tacoma Intl
$648
Find similar
SWISS
Dec 30
SEA12:35 pmSeattle/Tacoma Intl
21h 15m
2 stops
LGW5:50 pmLondon Gatwick
Jan 7
LGW6:40 pmLondon Gatwick
36h 03m
2 stops
SEA10:43 pmSeattle/Tacoma Intl
$911
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 832,500 searches. Data last updated December 21, 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

Wed 2/11

2:35 pm-10:55 am

1 stop12h 20m

London Gatwick

Mon 2/23

11:55 am-5:00 pm

1 stop13h 05m

$577

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Fri 3/6

2:35 pm-10:55 am

1 stop12h 20m

London Gatwick

Tue 3/10

11:55 am-6:00 pm

1 stop13h 05m

$578

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Fri 5/1

3:40 pm-11:45 am

1 stop12h 05m

London Gatwick

Wed 5/20

3:40 pm-8:40 pm

1 stop13h 00m

$579

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Tue 2/10

2:35 pm-10:55 am

1 stop12h 20m

London Gatwick

Tue 2/17

11:55 am-5:00 pm

1 stop13h 05m

$586

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Sun 5/10

7:00 pm-2:40 pm

1 stop11h 40m

London Gatwick

Sat 5/16

3:40 pm-8:40 pm

1 stop13h 00m

$587

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Wed 4/8

3:40 pm-2:40 pm

1 stop15h 00m

London Gatwick

Fri 4/24

3:40 pm-8:40 pm

1 stop13h 00m

$594

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Fri 3/6

2:35 pm-10:55 am

1 stop12h 20m

London Gatwick

Sat 3/14

11:55 am-6:00 pm

1 stop13h 05m

$599

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Fri 3/6

2:35 pm-10:55 am

1 stop12h 20m

London Gatwick

Wed 3/11

11:55 am-6:00 pm

1 stop13h 05m

$600

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Tue 2/10

2:35 pm-10:55 am

1 stop12h 20m

London Gatwick

Wed 2/18

11:55 am-5:00 pm

1 stop13h 05m

$602

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Wed 2/4

2:35 pm-9:45 pm

2 stops23h 10m

London Gatwick

Wed 2/11

7:00 am-5:00 pm

2 stops18h 00m

$603

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 $557.

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

The cheapest day to depart from Seattle to London Gatwick Airport is on a Sunday when prices can be found for as low as $643. Be sure to avoid booking your departure on a Wednesday as prices are generally higher than usual. According to our data, the average ticket price to London Gatwick Airport on Wednesday is $783.

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

Flying to London Gatwick Airport from Seattle at noon is the least expensive time of day to depart. momondo users have found prices as low as $608 when looking at flights departing at noon. In the morning is when there is more demand to fly to London Gatwick Airport, so prices are often more expensive at around $984 per ticket.

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
592 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
Dover
Luton
Slough
Guildford
Hayes
Dartford
Crawley
Brentwood
Wembley
Watford
Ilford
Cobham
Folkestone
Romford
Richmond
Uxbridge
Stansted

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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