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Cheap flights from Seattle to the United Kingdom from £181

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 20/9. 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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Cheap return flights

Icelandair Logo
23:30 - 14:35SEA-LGW
31h 05m1 stop
Icelandair Logo
15:40 - 20:40LGW-SEA
13h 00m1 stop
£375Icelandair
Find Deal
Sun, 7 Sep - Tue, 23 Sep
Icelandair Logo
15:45 - 11:55SEA-LHR
12h 10m1 stop
Icelandair Logo
21:25 - 17:50LHR-SEA
28h 25m1 stop
£375Icelandair
Find Deal
Wed, 24 Sep - Sat, 11 Oct
Iberia Logo
15:00 - 12:15SEA-LHR
13h 15m1 stop
Iberia Logo
19:10 - 00:27LHR-SEA
37h 17m2 stops
£388Iberia
Find Deal
Mon, 29 Sep - Thu, 16 Oct
Iberia Logo
20:20 - 13:40SEA-LHR
9h 20mdirect
Iberia Logo
08:20 - 21:18LHR-SEA
20h 58m1 stop
£392Iberia
Find Deal
Tue, 21 Oct - Tue, 4 Nov
Virgin Atlantic Logo
15:15 - 13:30SEA-LHR
14h 15m1 stop
Virgin Atlantic Logo
13:25 - 15:30LHR-SEA
10h 05mdirect
£402Virgin Atlantic
Find Deal
Sun, 5 Oct - Sun, 12 Oct
KLM Logo
20:25 - 14:15SEA-LHR
9h 50mdirect
KLM Logo
11:45 - 11:50LHR-SEA
32h 05m1 stop
£403KLM
Find Deal
Mon, 8 Sep - Tue, 14 Oct
Virgin Atlantic Logo
07:50 - 08:50SEA-LCY
17h 00m2 stops
Virgin Atlantic Logo
18:55 - 12:45LCY-SEA
24h 50m1 stop
£425Virgin Atlantic
Find Deal
Sun, 12 Oct - Tue, 28 Oct
KLM Logo
13:55 - 11:40SEA-LCY
13h 45m1 stop
KLM Logo
10:00 - 16:05LCY-SEA
14h 05m1 stop
£459KLM
Find Deal
Fri, 19 Sep - Fri, 26 Sep
British Airways Logo
07:23 - 16:30SEA-MAN
25h 07m2 stops
British Airways Logo
10:15 - 16:55MAN-SEA
14h 40m1 stop
£469British Airways
Find Deal
Tue, 2 Dec - Fri, 12 Dec
British Airways Logo
13:30 - 13:10SEA-MAN
15h 40m1 stop
British Airways Logo
13:15 - 23:18MAN-SEA
18h 03m2 stops
£472British Airways
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Tue, 7 Oct - Wed, 5 Nov

Icelandair flights from Seattle to United Kingdom

Our best Icelandair deals on Seattle to United Kingdom flight tickets
Icelandair
5 Sept
SEA23:30Seattle/Tacoma Intl
28h 25m
1 stop
LHR11:55London Heathrow
2 Oct
LHR21:25London Heathrow
28h 25m
1 stop
SEA17:50Seattle/Tacoma Intl
£375
Find similar
Icelandair
22 Sept
SEA15:45Seattle/Tacoma Intl
12h 10m
1 stop
LHR11:55London Heathrow
11 Oct
LHR21:25London Heathrow
28h 25m
1 stop
SEA17:50Seattle/Tacoma Intl
£376
Find similar
Icelandair
7 Sept
SEA19:00Seattle/Tacoma Intl
32h 55m
1 stop
LHR11:55London Heathrow
23 Sept
LHR13:05London Heathrow
15h 35m
1 stop
SEA20:40Seattle/Tacoma Intl
£376
Find similar

British Airways flights from Seattle to United Kingdom

Our best British Airways deals on Seattle to United Kingdom flight tickets
British Airways
26 Aug
SEA13:55Seattle/Tacoma Intl
16h 30m
1 stop
LHR14:25London Heathrow
23 Sept
LHR13:30London Heathrow
16h 34m
1 stop
SEA22:04Seattle/Tacoma Intl
£391
Find similar
British Airways
5 Sept
SEA07:45Seattle/Tacoma Intl
16h 20m
1 stop
LHR08:05London Heathrow
2 Oct
LHR09:50London Heathrow
9h 45m
SEA11:35Seattle/Tacoma Intl
£422
Find similar
British Airways
5 Sept
SEA10:11Seattle/Tacoma Intl
13h 09m
1 stop
LHR07:20London Heathrow
25 Sept
LHR09:50London Heathrow
9h 45m
SEA11:35Seattle/Tacoma Intl
£423
Find similar

momondo Fare Finder

 
Customise 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 279,928 searches. Data last updated 22 August 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

Sun 7/9

23:30-14:35

1 stop31h 05m

London Gatwick

Tue 23/9

15:40-20:40

1 stop13h 00m

£375

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 24/9

15:45-11:55

1 stop12h 10m

London Heathrow

Sat 11/10

21:25-17:50

1 stop28h 25m

£375

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 29/9

15:00-12:15

1 stop13h 15m

London Heathrow

Thu 16/10

19:10-00:27

2 stops37h 17m

£388

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 21/10

20:20-13:40

Nonstop9h 20m

London Heathrow

Tue 4/11

08:20-21:18

1 stop20h 58m

£392

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 5/10

15:15-13:30

1 stop14h 15m

London Heathrow

Sun 12/10

13:25-15:30

Nonstop10h 05m

£402

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 8/9

20:25-14:15

Nonstop9h 50m

London Heathrow

Tue 14/10

11:45-11:50

1 stop32h 05m

£403

SeattleLondon

SEA - LCY

SEALCY

Seattle/Tacoma Intl

Sun 12/10

07:50-08:50

2 stops17h 00m

London City

Tue 28/10

18:55-12:45

1 stop24h 50m

£425

SeattleLondon

SEA - LCY

SEALCY

Seattle/Tacoma Intl

Fri 19/9

13:55-11:40

1 stop13h 45m

London City

Fri 26/9

10:00-16:05

1 stop14h 05m

£459

SeattleManchester

SEA - MAN

SEAMAN

Seattle/Tacoma Intl

Tue 2/12

07:23-16:30

2 stops25h 07m

Manchester

Fri 12/12

10:15-16:55

1 stop14h 40m

£469

SeattleManchester

SEA - MAN

SEAMAN

Seattle/Tacoma Intl

Tue 7/10

13:30-13:10

1 stop15h 40m

Manchester

Wed 5/11

13:15-23:18

2 stops18h 03m

£472

Flights are sorted by cheapest return 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?

The cheapest month to fly to United Kingdom from Seattle is in October. Flight prices, which tend to average around £494, are often lower during this time because this is during the off-season. If you are unable to visit United Kingdom during the month of October, then departing from Seattle during the month January is also very affordable. Most momondo users find prices during this month for around £501.

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. Travellers who choose to depart for United Kingdom on a Tuesday will often find tickets for as low as £511. When flying out on a Friday, the most expensive travel day of the week, you can expect to see flight prices from Seattle to United Kingdom for around £729.

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

The cheapest time of day to fly to United Kingdom is at midday when flights can be purchased for as low as £595. Try not to purchase tickets in the morning because they tend to be around £1,018. Of course, these prices can vary depending on the time of year and what airport you fly to.

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 £598 when searching weeks before you fly. 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 £522 on momondo.

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

There are 3 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 48% 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

£328

Fastest flight time

9h 20m

Direct flights

Every day

Airports in United Kingdom

1 airport
The best one-way flight to United Kingdom from Seattle in the past 72 hours is £328. The best return flight deal from Seattle to United Kingdom found on momondo in the last 72 hours is £500.
The fastest flight from Seattle to United Kingdom takes 9h 20m
Direct flights go from Seattle to United Kingdom every day.
There is 1 airport near United Kingdom: London Heathrow (LHR)
Search flight deals

  • 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 were last updated today.

  • 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 a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Seattle/Tacoma Intl Airport to United Kingdom.

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

    The required travel and health documents for your United Kingdom trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at United Kingdom. We recommend that you seek guidance from your airline or a reliable 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
British AirwaysPriceFrom £353Free CancellationRating
6.7
7,292 reviews
Search British Airways flights
IcelandairPriceFrom £360Free CancellationRating
7.0
529 reviews
Search Icelandair flights
Virgin AtlanticPriceFrom £405Free CancellationRating
7.4
658 reviews
Search Virgin Atlantic flights
Aer LingusPriceFrom £500Free CancellationRating
7.1
1,228 reviews
Search Aer Lingus flights

Why use momondo?

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

Finding the right flight to United Kingdom from Seattle is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to United Kingdom quick and easy, saving you time and money.

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

Yes. momondo allows you to filter the results for Seattle to United Kingdom flights to just show those with flexible booking policies.

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

Once you have performed a search for Seattle to United Kingdom 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 United Kingdom right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Seattle to United Kingdom flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

An easier way to manage your United Kingdom trip

We make it super easy to schedule, organise 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 £27
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Flights to Birminghamfrom £28
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Flights to Glasgowfrom £30
Flights to Bristolfrom £20
Flights to Newcastle upon Tynefrom £24
Flights to Aberdeenfrom £51
Flights to Liverpoolfrom £25
Flights to Leedsfrom £35
Flights to Invernessfrom £39