Which stopover airport has the shortest travel time from Seattle to London?

Flights connecting via Vancouver (YVR) have the shortest average one-way travel time: 14h 10m.

Which stopover airport has the shortest connection time from Seattle to London?

Vancouver (YVR) has the shortest average stopover time for this route: 3h 08m.

Which airlines fly to London?

Virgin Atlantic, British Airways and Icelandair are the top three most popular airlines that fly to London from Seattle according to our data. Virgin Atlantic is the first choice among our users, with 54% of people opting to fly with this airline when travelling to London. Keep in mind that there are 3 different airlines that fly to London on a routine basis, so you have a few additional options to choose from.

How many flights depart from Seattle to London on average per day?

As of August 2025, 21 flights take off from Seattle and land in London each day. The most common flight departure time for this route is 20:00, with 50% of daily flights taking off in the afternoon.

Which airport is the most popular for stopovers for flights between Seattle and London?

Vancouver (YVR) was the most common stop: 60% of momondo users choosing one-stop flights on this route connected there.

Which stopover airport offers the lowest fares from Seattle to London?

Flights via Reykjavik (KEF) offer the lowest average return price of £458.

What is the cheapest airline that flies from Seattle/Tacoma Intl to London?

WestJet is the most popular carrier operating from Seattle/Tacoma Intl to London

How many flights depart from Seattle to London on average per week?

148 flights are operational weekly from Seattle to London as of August 2025. The most popular departure day for this route is Mon, with 15% of flights per week taking off on this day.

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?

There are 3 operators available for flights from Seattle/Tacoma Intl Airport to London as of August 2025.

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.

£166 Cheap Flights from Seattle to London in 2025

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Find the cheapest flights from Seattle to London

Round-trip

One-way

Last minute

Direct

Cheap return flights

07:20 - 18:25SEA-LGW

27h 05m2 stops

22:00 - 20:45LGW-SEA

30h 45m2 stops

£349

Find Deal

Wed, 13 Aug - Wed, 20 Aug

07:20 - 18:25SEA-LGW

27h 05m2 stops

22:00 - 20:45LGW-SEA

30h 45m2 stops

£350

Find Deal

Wed, 13 Aug - Wed, 20 Aug

19:35 - 18:55SEA-LHR

15h 20m1 stop

09:50 - 17:50LHR-SEA

16h 00m1 stop

£351Aer Lingus

Find Deal

Sun, 7 Sep - Tue, 23 Sep

19:35 - 20:20SEA-LHR

16h 45m1 stop

09:50 - 17:50LHR-SEA

16h 00m1 stop

£356Aer Lingus

Find Deal

Mon, 8 Sep - Fri, 19 Sep

20:25 - 14:15SEA-LHR

9h 50mdirect

18:00 - 20:25LHR-SEA

10h 25mdirect

£367Virgin Atlantic

Find Deal

Mon, 8 Sep - Fri, 19 Sep

19:00 - 14:40SEA-LGW

11h 40m1 stop

15:40 - 17:50LGW-SEA

34h 10m1 stop

£367Icelandair

Find Deal

Tue, 30 Sep - Sat, 11 Oct

20:25 - 14:15SEA-LHR

9h 50mdirect

18:00 - 20:25LHR-SEA

10h 25mdirect

£369Virgin Atlantic

Find Deal

Mon, 8 Sep - Fri, 19 Sep

14:35 - 19:30SEA-LHR

20h 55m1 stop

12:15 - 17:00LHR-SEA

12h 45m1 stop

£370Icelandair

Find Deal

Sun, 9 Nov - Wed, 19 Nov

18:50 - 12:20SEA-LHR

9h 30mdirect

14:55 - 16:55LHR-SEA

10h 00mdirect

£373British Airways

Find Deal

Wed, 12 Nov - Wed, 19 Nov

13:30 - 06:50SEA-LHR

9h 20mdirect

09:25 - 11:10LHR-SEA

9h 45mdirect

£374British Airways

Find Deal

Wed, 1 Oct - Tue, 14 Oct

British Airways flights from Seattle to London

Our best British Airways deals on Seattle to London flight tickets

British Airways

12 Nov

SEA18:50Seattle/Tacoma Intl

9h 30m

LHR12:20London Heathrow

19 Nov

LHR14:55London Heathrow

10h 00m

SEA16:55Seattle/Tacoma Intl

£373

Find similar

British Airways

1 Oct

SEA13:30Seattle/Tacoma Intl

9h 20m

LHR06:50London Heathrow

14 Oct

LHR09:25London Heathrow

9h 45m

SEA11:10Seattle/Tacoma Intl

£374

Find similar

British Airways

3 Sept

SEA20:20Seattle/Tacoma Intl

9h 20m

LHR13:40London Heathrow

30 Oct

LHR14:55London Heathrow

10h 00m

SEA17:55Seattle/Tacoma Intl

£378

Find similar

Icelandair flights from Seattle to London

Our best Icelandair deals on Seattle to London flight tickets

Icelandair

30 Sept

SEA19:00Seattle/Tacoma Intl

11h 40m

1 stop

LGW14:40London Gatwick

11 Oct

LGW15:40London Gatwick

34h 10m

1 stop

SEA17:50Seattle/Tacoma Intl

£367

Find similar

Icelandair

9 Nov

SEA14:35Seattle/Tacoma Intl

20h 55m

1 stop

LHR19:30London Heathrow

19 Nov

LHR12:15London Heathrow

12h 45m

1 stop

SEA17:00Seattle/Tacoma Intl

£370

Find similar

Icelandair

14 Oct

SEA15:45Seattle/Tacoma Intl

20h 35m

1 stop

LHR20:20London Heathrow

23 Oct

LHR13:05London Heathrow

12h 45m

1 stop

SEA17:50Seattle/Tacoma Intl

£370

Find similar

Fly from

Fly to

Route

Depart

Return

Price

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Wed 13/8

07:20-18:25

2 stops27h 05m

London Gatwick

Wed 20/8

22:00-20:45

2 stops30h 45m

£349

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Wed 13/8

07:20-18:25

2 stops27h 05m

London Gatwick

Wed 20/8

22:00-20:45

2 stops30h 45m

£350

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 7/9

19:35-18:55

1 stop15h 20m

London Heathrow

Tue 23/9

09:50-17:50

1 stop16h 00m

£351

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 8/9

19:35-20:20

1 stop16h 45m

London Heathrow

Fri 19/9

09:50-17:50

1 stop16h 00m

£356

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 8/9

20:25-14:15

Nonstop9h 50m

London Heathrow

Fri 19/9

18:00-20:25

Nonstop10h 25m

£367

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Tue 30/9

19:00-14:40

1 stop11h 40m

London Gatwick

Sat 11/10

15:40-17:50

1 stop34h 10m

£367

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 8/9

20:25-14:15

Nonstop9h 50m

London Heathrow

Fri 19/9

18:00-20:25

Nonstop10h 25m

£369

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 9/11

14:35-19:30

1 stop20h 55m

London Heathrow

Wed 19/11

12:15-17:00

1 stop12h 45m

£370

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 12/11

18:50-12:20

Nonstop9h 30m

London Heathrow

Wed 19/11

14:55-16:55

Nonstop10h 00m

£373

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 1/10

13:30-06:50

Nonstop9h 20m

London Heathrow

Tue 14/10

09:25-11:10

Nonstop9h 45m

£374

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

Stopovers

Other information

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 £502, 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 £509.

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

Our data shows that Tuesday is the least expensive day to fly to London. Tickets to fly out on this day can be as low as £512. 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 £741.

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

The cheapest time of day to fly to London is at midday when flights can be purchased for as low as £595. Flights in the morning are often more expensive, with an average ticket price of £1,034.

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 weeks ahead of your departure date. In general, you can expect to find flights to London for around £608 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London from Seattle for as low as £533 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 August 2025, prices for Seattle to London flights are approximately 54% 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	£166
Fastest flight time	9h 20m
Direct flights	Every day
Airports in London	6 airports

The best one-way flight to London from Seattle in the past 72 hours is £166. The best return flight deal from Seattle to London found on momondo in the last 72 hours is £349.

The fastest flight from Seattle to London takes 9h 20m

Direct flights go from Seattle to London every day.

There are 6 airports near London: London City (LCY), London Heathrow (LHR), London Luton (LTN), London Stansted (STN), London Gatwick (LGW), London Southend (SEN)

Search flight deals

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?
There are 3 operators available for flights from Seattle/Tacoma Intl Airport to London as of August 2025.
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?
Based on momondo bookings for flights between Seattle and London, the leading plane model is Boeing 787-10 Dreamliner, making up 35.06% of the total bookings. Other popular models include Airbus A330-900neo with 20.82%, Boeing 777-300 with 13.28%, and Boeing 787-9 Dreamliner with 8.65%.
What is the most popular airline from Seattle to London?
Based on momondo bookings for flights between Seattle and London, the leading airline is Virgin Atlantic, making up 41% of the total bookings. Other popular airlines include Icelandair with 21%, British Airways with 17%, and KLM with 13%.

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
British Airways	PriceFrom £358	Free Cancellation	Rating 6.6 7,222 reviews	Search British Airways flights
Icelandair	PriceFrom £366	Free Cancellation	Rating 7.0 520 reviews	Search Icelandair flights
Virgin Atlantic	PriceFrom £454	Free Cancellation	Rating 7.4 655 reviews	Search Virgin Atlantic flights

Virgin Atlantic Flights From Seattle to London
Virgin Atlantic flies from Seattle to London around 14 times per week, with 655 momondo users rating the airline 7.4/10. The cheapest Virgin Atlantic deal from Seattle to London in the last 72 hours was £601 (round-trip), much lower than the average airfare cost of £833 for Virgin Atlantic flights on this route.
British Airways Flights From Seattle to London
Another popular option for Seattle to London flights is British Airways (6.6/10, 7,222 ratings). British Airways flies from Seattle to London around 13 times per week, with deals starting from £474 round-trip and rising to an average price of around £916.

Eastbourne

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Luton

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Southend-on-Sea

Maidstone

Canterbury

Gatwick

Ipswich

Ilford

Dartford

Guildford

Colchester

Worthing

Hounslow

Dover

Winchester

Margate

Chelmsford

Bedford

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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Cheap flights from Seattle to London from £166

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 1/10. 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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British Airways flights from Seattle to London

Our best British Airways deals on Seattle to London flight tickets

Icelandair flights from Seattle to London

Our best Icelandair deals on Seattle to London flight tickets

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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?

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

Our data shows that Tuesday is the least expensive day to fly to London. Tickets to fly out on this day can be as low as £512. 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 £741.

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

The cheapest time of day to fly to London is at midday when flights can be purchased for as low as £595. Flights in the morning are often more expensive, with an average ticket price of £1,034.

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?

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 August 2025, prices for Seattle to London flights are approximately 54% cheaper when compared to flights at the same time last year.

What is the cheapest airline that flies from Seattle/Tacoma Intl to London?

WestJet is the most popular carrier operating from Seattle/Tacoma Intl to London

Which airlines fly to London?

Which airport is the most popular for stopovers for flights between Seattle and London?

Vancouver (YVR) was the most common stop: 60% of momondo users choosing one-stop flights on this route connected there.

Which stopover airport offers the lowest fares from Seattle to London?

Flights via Reykjavik (KEF) offer the lowest average return price of £458.

Which stopover airport has the shortest travel time from Seattle to London?

Flights connecting via Vancouver (YVR) have the shortest average one-way travel time: 14h 10m.

Which stopover airport has the shortest connection time from Seattle to London?

Vancouver (YVR) has the shortest average stopover time for this route: 3h 08m.

How many flights depart from Seattle to London on average per day?

As of August 2025, 21 flights take off from Seattle and land in London each day. The most common flight departure time for this route is 20:00, with 50% of daily flights taking off in the afternoon.

How many flights depart from Seattle to London on average per week?

148 flights are operational weekly from Seattle to London as of August 2025. The most popular departure day for this route is Mon, with 15% of flights per week taking off on this day.

When to book flights from Seattle to London

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

Fastest flight time

Direct flights

Airports in London

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

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

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?

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

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

Virgin Atlantic Flights From Seattle to London

British Airways Flights From Seattle to London

Travelling to a place near London?

Why use momondo?

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

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

How can momondo help me find flights from Seattle to London?

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

An easier way to manage your London 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.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United Kingdom