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Cheap flights from Seattle to London from £168

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 15/10. 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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0 bags

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Cheap return flights

KAYAK's recommended return flight deals from the most popular airlines that fly from Seattle to London.
Scandinavian Airlines Logo
16:20 - 21:40SEA-LHR
21h 20m1 stop
Scandinavian Airlines Logo
19:30 - 14:00LHR-SEA
26h 30m1 stop
£334Scandinavian Airlines
Find Deal
Sun, 21 Sep - Tue, 14 Oct
Scandinavian Airlines Logo
16:20 - 21:40SEA-LHR
21h 20m1 stop
Scandinavian Airlines Logo
06:40 - 14:00LHR-SEA
15h 20m1 stop
£344Scandinavian Airlines
Find Deal
Sun, 21 Sep - Wed, 15 Oct
Icelandair Logo
15:45 - 14:40SEA-LGW
14h 55m1 stop
Icelandair Logo
15:40 - 20:40LGW-SEA
13h 00m1 stop
£439Icelandair
Find Deal
Thu, 9 Oct - Tue, 21 Oct
Icelandair Logo
19:00 - 14:40SEA-LGW
11h 40m1 stop
Icelandair Logo
15:40 - 20:40LGW-SEA
13h 00m1 stop
£440Icelandair
Find Deal
Fri, 3 Oct - Mon, 13 Oct
Virgin Atlantic Logo
17:35 - 11:20SEA-LHR
9h 45mdirect
Virgin Atlantic Logo
13:25 - 15:45LHR-SEA
10h 20mdirect
£498Virgin Atlantic
Find Deal
Tue, 14 Oct - Thu, 23 Oct
British Airways Logo
13:30 - 06:50SEA-LHR
9h 20mdirect
British Airways Logo
09:25 - 11:10LHR-SEA
9h 45mdirect
£507British Airways
Find Deal
Wed, 1 Oct - Tue, 14 Oct
Virgin Atlantic Logo
05:45 - 10:00SEA-LGW
20h 15m2 stops
Virgin Atlantic Logo
12:00 - 22:53LGW-SEA
18h 53m1 stop
£512Virgin Atlantic
Find Deal
Tue, 5 Aug - Tue, 19 Aug
British Airways Logo
20:20 - 13:40SEA-LHR
9h 20mdirect
British Airways Logo
16:30 - 18:20LHR-SEA
9h 50mdirect
£528British Airways
Find Deal
Wed, 3 Sep - Tue, 23 Sep
KLM Logo
17:40 - 16:40SEA-LCY
15h 00m1 stop
KLM Logo
09:20 - 16:05LCY-SEA
14h 45m1 stop
£554KLM
Find Deal
Wed, 1 Oct - Fri, 10 Oct
KLM Logo
17:40 - 16:40SEA-LCY
15h 00m1 stop
KLM Logo
09:20 - 16:05LCY-SEA
14h 45m1 stop
£588KLM
Find Deal
Sun, 14 Sep - Thu, 2 Oct

Delta flights from Seattle to London

Our best Delta deals on Seattle to London flight tickets
Delta
21 Sept
SEA20:25Seattle/Tacoma Intl
9h 50m
LHR14:15London Heathrow
1 Oct
LHR06:30London Heathrow
13h 20m
1 stop
SEA11:50Seattle/Tacoma Intl
Delta
23 Sept
SEA20:25Seattle/Tacoma Intl
9h 50m
LHR14:15London Heathrow
7 Oct
LHR13:25London Heathrow
10h 20m
SEA15:45Seattle/Tacoma Intl
Delta
12 Oct
SEA00:40Seattle/Tacoma Intl
28h 30m
1 stop
LHR13:10London Heathrow
22 Oct
LHR06:30London Heathrow
13h 20m
1 stop
SEA11:50Seattle/Tacoma Intl

Air Canada flights from Seattle to London

Our best Air Canada deals on Seattle to London flight tickets
Air Canada
22 Sept
SEA07:20Seattle/Tacoma Intl
18h 15m
1 stop
LHR09:35London Heathrow
13 Oct
LHR17:10London Heathrow
33h 26m
2 stops
SEA18:36Seattle/Tacoma Intl
Air Canada
23 Sept
SEA05:30Seattle/Tacoma Intl
20h 05m
2 stops
LHR09:35London Heathrow
30 Sept
LHR08:45London Heathrow
17h 51m
2 stops
SEA18:36Seattle/Tacoma Intl
Air Canada
20 Sept
SEA12:10Seattle/Tacoma Intl
34h 25m
1 stop
LHR06:35London Heathrow
16 Oct
LHR06:00London Heathrow
24h 16m
2 stops
SEA22:16Seattle/Tacoma Intl

See travel insights to London from

How to get the cheapest flight ticket from Seattle to London

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?

The cheapest month to fly to London from Seattle is in October. Flight prices, which tend to average around £501, are often lower during this time because this is during the off-season. The month of January is another great option to travel to London, with average flight prices from Seattle averaging around £503.

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

Our data shows that Monday is the least expensive day to fly to London. Tickets to fly out on this day can be as low as £612. When flying out on a Thursday, the most expensive travel day of the week, you can expect to see flight prices from Seattle to London for around £825.

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

The cheapest time of day to fly to London is in the afternoon when flights can be purchased for as low as £661. Flights in the morning are often more expensive, with an average ticket price of £1,029.

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

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

How far in advance should I book a flight to London?

You are more likely to see cheaper flights to London from Seattle when booking 9 weeks ahead of your departure date. In general, you can expect to find flights to London for around £617 when searching 9 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London from Seattle for as low as £588 on momondo.

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

There are 3 cabin classes available to choose from on Seattle/Tacoma Intl to London flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

How have Seattle to London flight prices changed over time?

As of April 2025, prices for Seattle to London flights are approximately 28% cheaper when compared to flights at the same time last year.

When to book flights from Seattle to London

Are you open to changing your travel dates? Check out the ideal times to fly from Seattle to London according to our flight data. Find out which month and days have the cheapest flights.
Estimated return price

Cheap Seattle to London (SEA to LON) flight deals and tips

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

Best price found

£168

Fastest flight time

9h 20m

Direct flights

Every day

Airports in London

3 airports
The best one-way flight to London from Seattle in the past 72 hours is £168. The best return flight deal from Seattle to London found on momondo in the last 72 hours is £334.
The fastest flight from Seattle to London takes 9h 20m
Direct flights go from Seattle to London every day.
There are 3 airports near London: London Heathrow (LHR), London Stansted (STN), London Gatwick (LGW)

  • How far is Seattle/Tacoma Intl to London by plane?

    London is 4781.3 mi away from Seattle/Tacoma Intl. Typically, this will take 9h 20m by plane in normal conditions.

  • When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to London?

    Prices for flights from Seattle/Tacoma Intl Airport to London were last updated today.

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

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

    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.

  • What documentation or ID do you need to fly to London?

    The required travel and health documents for your London 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 London. 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 London?

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


Best airlines flying from Seattle to London

Compare and see reviews for airlines that fly from Seattle to London with momondo
Airline
Rating
Free Cancellation
Price
IcelandairPriceFrom £364Free CancellationRating
7.0
484 reviews
Search Icelandair flights
IberiaPriceFrom £432Free CancellationRating
7.0
2,686 reviews
Search Iberia flights
Virgin AtlanticPriceFrom £451Free CancellationRating
7.4
642 reviews
Search Virgin Atlantic flights
British AirwaysPriceFrom £461Free CancellationRating
6.6
6,815 reviews
Search British Airways flights
KLMPriceFrom £497Free CancellationRating
7.8
1,334 reviews
Search KLM flights
  • KLM Flights From Seattle to London

    KLM flies from Seattle to London around 14 times per week, with 1,334 momondo users rating the airline 7.8/10. The cheapest KLM deal from Seattle to London in the last 72 hours was £662 (round-trip), much lower than the average airfare cost of £1,069 for KLM flights on this route.

  • Virgin Atlantic Flights From Seattle to London

    Another popular option for Seattle to London flights is Virgin Atlantic (7.4/10, 642 ratings). Virgin Atlantic flies from Seattle to London around 14 times per week, with deals starting from £601 round-trip and rising to an average price of around £951.


Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Eastbourne
Milton Keynes
Luton
Slough
Southend-on-Sea
Gatwick
Maidstone
Ipswich
Canterbury
Margate
Dartford
Ilford
Hounslow
Colchester
Guildford
Worthing
Winchester
Crawley
Chichester
Croydon

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Seattle to London . Millions of users trust and use momondo every year so you are in good hands.

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

Flights from Seattle to London with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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?

Yes. momondo can track prices for Seattle to London 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.


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Find better results for your trip to the United Kingdom

Fly into one of these airports located in London

Airports listed have a maximum distance of 35.6 mi from London