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Cheap flights from Seattle to the United Kingdom from $234

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 the United Kingdom departing on 9/30. 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 the United Kingdom

Cheap round-trip flights

Icelandair Logo
11:30 pm - 2:35 pmSEA-LGW
31h 05m1 stop
Icelandair Logo
3:40 pm - 8:40 pmLGW-SEA
13h 00m1 stop
$507Icelandair
Find Deal
Fri, Sep 5 - Fri, Sep 26
Icelandair Logo
3:45 pm - 11:55 amSEA-LHR
12h 10m1 stop
Icelandair Logo
1:05 pm - 5:50 pmLHR-SEA
12h 45m1 stop
$507Icelandair
Find Deal
Sat, Sep 27 - Tue, Oct 7
Icelandair Logo
11:30 pm - 2:40 pmSEA-LGW
31h 10m1 stop
Icelandair Logo
3:40 pm - 8:40 pmLGW-SEA
13h 00m1 stop
$508Icelandair
Find Deal
Thu, Sep 4 - Fri, Sep 26
British Airways Logo
11:42 am - 3:35 pmSEA-MAN
19h 53m2 stops
British Airways Logo
12:35 pm - 4:55 pmMAN-SEA
12h 20m1 stop
$625British Airways
Find Deal
Sun, Nov 9 - Tue, Nov 25
British Airways Logo
6:50 pm - 6:45 pmSEA-MAN
15h 55m1 stop
British Airways Logo
9:00 am - 4:55 pmMAN-SEA
15h 55m1 stop
$626British Airways
Find Deal
Wed, Nov 5 - Fri, Nov 21
American Airlines Logo
2:52 pm - 3:15 pmSEA-MAN
16h 23m2 stops
American Airlines Logo
1:15 pm - 11:18 pmMAN-SEA
18h 03m2 stops
$639American Airlines
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Tue, Oct 7 - Wed, Nov 5
Virgin Atlantic Logo
1:55 pm - 5:20 pmSEA-LCY
19h 25m1 stop
Virgin Atlantic Logo
9:20 am - 4:05 pmLCY-SEA
14h 45m1 stop
$714Virgin Atlantic
Find Deal
Tue, Sep 30 - Tue, Oct 7
Virgin Atlantic Logo
5:40 pm - 5:20 pmSEA-LCY
15h 40m1 stop
Virgin Atlantic Logo
7:45 am - 8:15 pmLCY-SEA
20h 30m2 stops
$724Virgin Atlantic
Find Deal
Tue, Sep 23 - Tue, Sep 30
Delta Logo
5:55 pm - 8:50 amSEA-LCY
30h 55m2 stops
Delta Logo
10:00 am - 4:05 pmLCY-SEA
14h 05m1 stop
$729Delta
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Sat, Sep 27 - Fri, Oct 10
Delta Logo
1:55 pm - 11:40 amSEA-LCY
13h 45m1 stop
Delta Logo
10:00 am - 11:50 amLCY-SEA
33h 50m1 stop
$764Delta
Find Deal
Fri, Sep 26 - Mon, Oct 6

SWISS flights from Seattle to United Kingdom

Our best SWISS deals on Seattle to United Kingdom flight tickets
SWISS
Sep 8
SEA4:25 pmSeattle/Tacoma Intl
21h 20m
1 stop
LHR9:45 pmLondon Heathrow
Sep 18
LHR8:40 amLondon Heathrow
17h 56m
2 stops
SEA6:36 pmSeattle/Tacoma Intl
$514
Find similar
SWISS
Sep 13
SEA4:20 pmSeattle/Tacoma Intl
31h 15m
1 stop
LCY7:35 amLondon City
Sep 20
LCY12:15 pmLondon City
42h 05m
2 stops
SEA10:20 pmSeattle/Tacoma Intl
$637
Find similar
SWISS
Sep 30
SEA3:28 pmSeattle/Tacoma Intl
18h 02m
2 stops
LCY5:30 pmLondon City
Oct 23
LCY9:25 amLondon City
17h 11m
2 stops
SEA6:36 pmSeattle/Tacoma Intl
$668
Find similar

Scandinavian Airlines flights from Seattle to United Kingdom

Our best Scandinavian Airlines deals on Seattle to United Kingdom flight tickets
Scandinavian Airlines
Oct 5
SEA4:20 pmSeattle/Tacoma Intl
17h 20m
1 stop
LHR5:40 pmLondon Heathrow
Oct 18
LHR3:35 pmLondon Heathrow
30h 25m
2 stops
SEA2:00 pmSeattle/Tacoma Intl
$527
Find similar
Scandinavian Airlines
Oct 5
SEA4:20 pmSeattle/Tacoma Intl
15h 40m
1 stop
LHR4:00 pmLondon Heathrow
Oct 18
LHR5:30 pmLondon Heathrow
28h 30m
2 stops
SEA2:00 pmSeattle/Tacoma Intl
$530
Find similar
Scandinavian Airlines
Oct 3
SEA4:20 pmSeattle/Tacoma Intl
16h 05m
2 stops
LHR4:25 pmLondon Heathrow
Oct 10
LHR6:40 amLondon Heathrow
15h 20m
2 stops
SEA2:00 pmSeattle/Tacoma Intl
$537
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to United Kingdom 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 August 18, 2025.
Use the filters below to find and compare flights from Seattle to the United Kingdom that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Fri 9/5

11:30 pm-2:35 pm

1 stop31h 05m

London Gatwick

Fri 9/26

3:40 pm-8:40 pm

1 stop13h 00m

$507

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sat 9/27

3:45 pm-11:55 am

1 stop12h 10m

London Heathrow

Tue 10/7

1:05 pm-5:50 pm

1 stop12h 45m

$507

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Thu 9/4

11:30 pm-2:40 pm

1 stop31h 10m

London Gatwick

Fri 9/26

3:40 pm-8:40 pm

1 stop13h 00m

$508

SeattleManchester

SEA - MAN

SEAMAN

Seattle/Tacoma Intl

Sun 11/9

11:42 am-3:35 pm

2 stops19h 53m

Manchester

Tue 11/25

12:35 pm-4:55 pm

1 stop12h 20m

$625

SeattleManchester

SEA - MAN

SEAMAN

Seattle/Tacoma Intl

Wed 11/5

6:50 pm-6:45 pm

1 stop15h 55m

Manchester

Fri 11/21

9:00 am-4:55 pm

1 stop15h 55m

$626

SeattleManchester

SEA - MAN

SEAMAN

Seattle/Tacoma Intl

Tue 10/7

2:52 pm-3:15 pm

2 stops16h 23m

Manchester

Wed 11/5

1:15 pm-11:18 pm

2 stops18h 03m

$639

SeattleLondon

SEA - LCY

SEALCY

Seattle/Tacoma Intl

Tue 9/30

1:55 pm-5:20 pm

1 stop19h 25m

London City

Tue 10/7

9:20 am-4:05 pm

1 stop14h 45m

$714

SeattleLondon

SEA - LCY

SEALCY

Seattle/Tacoma Intl

Tue 9/23

5:40 pm-5:20 pm

1 stop15h 40m

London City

Tue 9/30

7:45 am-8:15 pm

2 stops20h 30m

$724

SeattleLondon

SEA - LCY

SEALCY

Seattle/Tacoma Intl

Sat 9/27

5:55 pm-8:50 am

2 stops30h 55m

London City

Fri 10/10

10:00 am-4:05 pm

1 stop14h 05m

$729

SeattleLondon

SEA - LCY

SEALCY

Seattle/Tacoma Intl

Fri 9/26

1:55 pm-11:40 am

1 stop13h 45m

London City

Mon 10/6

10:00 am-11:50 am

1 stop33h 50m

$764

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 the United Kingdom from

How to get the cheapest flight ticket from Seattle to United Kingdom

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 United Kingdom?

In general, October is the cheapest month to fly from Seattle to United Kingdom. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $664. If you aren’t able to travel to United Kingdom during the month of October, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $674.

What is the cheapest day to depart on your flight to United Kingdom?

The cheapest day to depart from Seattle to United Kingdom is on a Tuesday when prices can be found for as low as $813. The most expensive day to fly to United Kingdom is Saturday, with ticket prices averaging around $931.

What is the cheapest time of day to depart on your flight to United Kingdom?

According to our data, the cheapest time of day to fly to United Kingdom is in the evening. momondo users have found flights departing from Seattle to United Kingdom in the evening for as low as $845. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to United Kingdom are more costly in the morning, with an average ticket price of $980. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest Seattle/Tacoma Intl to United Kingdom flight route?

Fly from Seattle/Tacoma Intl to London Heathrow for the best Seattle/Tacoma Intl - United Kingdom flight prices

How far in advance should I book a flight to United Kingdom?

You are more likely to see cheaper flights to United Kingdom from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to United Kingdom for around $804 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to United Kingdom from Seattle for as low as $701 on momondo.

What cabin class options are available on Seattle/Tacoma Intl to United Kingdom flights?

There are 4 cabin classes available to choose from on Seattle/Tacoma Intl to United Kingdom flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Seattle to United Kingdom flights?

You could potentially save up to 54% on your flight if you consider stops on a Seattle to United Kingdom flight.

Cheap Seattle to United Kingdom flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to United Kingdom

Best Price Found

$234

Fastest flight time

10h 10m

Direct flights

Every day

Airports in United Kingdom

8 airports
The best one-way flight to United Kingdom from Seattle in the past 72 hours is $234. The best round-trip flight deal from Seattle to United Kingdom found on momondo in the last 72 hours is $507.
The fastest flight from Seattle to United Kingdom takes 10h 10m
Direct flights go from Seattle to United Kingdom every day.
There are 8 airports near United Kingdom: London City (LCY), London Heathrow (LHR), London Luton (LTN), Edinburgh Turnhouse (EDI), Manchester (MAN), London Stansted (STN), London Gatwick (LGW), Glasgow Intl (GLA)
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  • When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to United Kingdom?

    Prices for flights from Seattle/Tacoma Intl Airport to United Kingdom refresh daily.

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

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

    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 United Kingdom.

  • What documentation or ID do you need to fly to United Kingdom?

    The necessary travel and health documents for your United Kingdom trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from Seattle to United Kingdom?

Best airlines flying from Seattle to United Kingdom

Compare and see reviews for airlines that fly from Seattle to United Kingdom with momondo
Airline
Rating
Free Cancellation
Price
JetBluePriceFrom $213Free CancellationRating
7.2
2,915 reviews
Search JetBlue flights
LufthansaPriceFrom $378Free CancellationRating
6.8
7,330 reviews
Search Lufthansa flights
IcelandairPriceFrom $485Free CancellationRating
7.0
527 reviews
Search Icelandair flights
Scandinavian AirlinesPriceFrom $532Free CancellationRating
7.4
1,470 reviews
Search Scandinavian Airlines flights
Air FrancePriceFrom $532Free CancellationRating
7.4
1,468 reviews
Search Air France flights
United AirlinesPriceFrom $547Free CancellationRating
7.4
8,925 reviews
Search United Airlines flights
FinnairPriceFrom $556Free CancellationRating
7.6
1,320 reviews
Search Finnair flights
British AirwaysPriceFrom $564Free CancellationRating
6.6
7,277 reviews
Search British Airways flights
American AirlinesPriceFrom $568Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
Aer LingusPriceFrom $572Free CancellationRating
7.2
1,220 reviews
Search Aer Lingus flights

Why use momondo?

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

It is quick and easy to find Seattle to United Kingdom 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 United Kingdom that suits you.

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

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

How can momondo help me find flights from Seattle to United Kingdom?

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 United Kingdom.

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

If you are not ready to book a flight from Seattle to United Kingdom now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to United Kingdom and let you know when they change.

An easier way to manage your United Kingdom 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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Find better results for your trip to the United Kingdom

Popular cities in the United Kingdom

Popular flights according to clicks in the last 7 days on momondo
Flights to Londonfrom $354
Flights to Manchesterfrom $362
Flights to Edinburghfrom $406
Flights to Birminghamfrom $427
Flights to Glasgowfrom $405
Flights to Belfastfrom $475
Flights to Newcastle upon Tynefrom $462
Flights to Bristolfrom $414
Flights to Invernessfrom $408
Flights to Liverpoolfrom $442
Flights to Aberdeenfrom $507
Flights to Leedsfrom $467