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Cheap flights from Seattle to London from £151

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 6/7. 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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Find the cheapest flights from Seattle to London

Cheap return flights

KAYAK's recommended return flight deals from the most popular airlines that fly from Seattle to London.
19:00 - 11:55SEA-LHR
32h 55m1 stop
21:25 - 11:25LHR-SEA
22h 00m1 stop
£406Icelandair
Find Deal
Tue, 20 May - Tue, 27 May
19:00 - 14:35SEA-LGW
11h 35m1 stop
20:55 - 20:28LGW-SEA
31h 33m2 stops
Mon, 19 May - Wed, 18 Jun
17:35 - 11:20SEA-LHR
9h 45mdirect
13:25 - 15:45LHR-SEA
10h 20mdirect
£509Virgin Atlantic
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Sun, 27 Apr - Tue, 13 May
17:35 - 11:20SEA-LHR
9h 45mdirect
13:25 - 15:45LHR-SEA
10h 20mdirect
£522Virgin Atlantic
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Sun, 27 Apr - Tue, 13 May
20:20 - 13:40SEA-LHR
9h 20mdirect
09:25 - 11:10LHR-SEA
9h 45mdirect
£523British Airways
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Tue, 29 Apr - Tue, 13 May
20:20 - 14:15SEA-LHR
9h 55mdirect
06:15 - 17:25LHR-SEA
19h 10m1 stop
£533Delta
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Sun, 27 Apr - Tue, 6 May
20:20 - 14:15SEA-LHR
9h 55mdirect
17:25 - 19:40LHR-SEA
10h 15mdirect
£539KLM
Find Deal
Tue, 29 Apr - Tue, 13 May
20:20 - 14:15SEA-LHR
9h 55mdirect
17:25 - 19:40LHR-SEA
10h 15mdirect
£540Delta
Find Deal
Sun, 27 Apr - Tue, 13 May
20:20 - 13:40SEA-LHR
9h 20mdirect
09:50 - 11:35LHR-SEA
9h 45mdirect
£561British Airways
Find Deal
Tue, 29 Apr - Mon, 12 May
18:10 - 16:40SEA-LCY
14h 30m1 stop
10:00 - 15:57LCY-SEA
13h 57m1 stop
£563KLM
Find Deal
Sun, 27 Apr - Tue, 13 May

Icelandair flights from Seattle to London

Our best Icelandair deals on Seattle to London flight tickets
Icelandair
20 May
SEA19:00Seattle/Tacoma Intl
32h 55m
1 stop
LHR11:55London Heathrow
27 May
LHR21:25London Heathrow
22h 00m
1 stop
SEA11:25Seattle/Tacoma Intl
Icelandair
11 May
SEA19:00Seattle/Tacoma Intl
32h 45m
1 stop
LGW11:45London Gatwick
27 May
LGW15:40London Gatwick
27h 45m
1 stop
SEA11:25Seattle/Tacoma Intl
Icelandair
20 May
SEA19:00Seattle/Tacoma Intl
17h 20m
1 stop
LHR20:20London Heathrow
29 May
LHR21:25London Heathrow
22h 00m
1 stop
SEA11:25Seattle/Tacoma Intl

Scandinavian Airlines flights from Seattle to London

Our best Scandinavian Airlines deals on Seattle to London flight tickets
Scandinavian Airlines
2 Jun
SEA16:00Seattle/Tacoma Intl
21h 40m
1 stop
LHR21:40London Heathrow
16 Jun
LHR07:05London Heathrow
14h 45m
2 stops
SEA13:50Seattle/Tacoma Intl
Scandinavian Airlines
26 May
SEA16:00Seattle/Tacoma Intl
16h 00m
1 stop
LHR16:00London Heathrow
29 Jun
LHR18:40London Heathrow
27h 10m
1 stop
SEA13:50Seattle/Tacoma Intl
Scandinavian Airlines
21 Sept
SEA16:20Seattle/Tacoma Intl
21h 20m
1 stop
LHR21:40London Heathrow
1 Oct
LHR06:40London Heathrow
15h 20m
1 stop
SEA14:00Seattle/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 typical price of a round-trip flight between Seattle and London?

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 £516, 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 £517.

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 £629. When flying out on a Friday, the most expensive travel day of the week, you can expect to see flight prices from Seattle to London for around £879.

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 £679. Flights in the morning are often more expensive, with an average ticket price of £1,058.

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 6 weeks ahead of your departure date. In general, you can expect to find flights to London for around £642 when searching 6 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 £573 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 March 2025, prices for Seattle to London flights are approximately 26% 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

£151

Fastest flight time

9h 20m

Direct flights

Every day

Airports in London

4 airports
The best one-way flight to London from Seattle in the past 72 hours is £151. The best return flight deal from Seattle to London found on momondo in the last 72 hours is £406.
The fastest flight from Seattle to London takes 9h 20m
Direct flights go from Seattle to London every day.
There are 4 airports near London: London Heathrow (LHR), London Luton (LTN), 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 £374Free CancellationRating
7.0
476 reviews
Search Icelandair flights
Virgin AtlanticPriceFrom £464Free CancellationRating
7.4
634 reviews
Search Virgin Atlantic flights
British AirwaysPriceFrom £474Free CancellationRating
6.6
6,712 reviews
Search British Airways flights
KLMPriceFrom £512Free CancellationRating
7.8
1,321 reviews
Search KLM flights
  • KLM Flights From Seattle to London

    KLM flies from Seattle to London around 4 times per week, with 1,321 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, 634 ratings). Virgin Atlantic flies from Seattle to London around 4 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
Ipswich
Maidstone
Margate
Canterbury
Dartford
Hounslow
Ilford
Colchester
Guildford
Winchester
Worthing
Chichester
Croydon
Crawley

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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Fly into one of these airports located in London

Airports listed have a maximum distance of 35.6 mi from London