What is the most punctual flight time for London to Seattle flights?

Generally, flights departing in the evening tend to experience fewer delays. Flights departing in the early afternoon have, in the past, seen delays more frequently in comparison.

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

12 flights are operational daily from London to Seattle as of December 2025. The most popular departure time for this route is 12:00, with 73% of flights per day taking off in the afternoon.

How often are flights from London to Seattle delayed?

Historically, on average around 13% of flights between London and Seattle have experienced a delay on any given week. The average delay length over the past 12 months has been 119 minutes.

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

As of December 2025, there are 89 flights per week flying from London to Seattle. The most common day of the week flights depart is Mon, with 17% of flights taking off on this day.

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

Finnair, Lufthansa, and United Airlines are the most popular carriers operating from London to Seattle/Tacoma Intl

What day of the week experiences the fewest flight delays on this route?

Tuesday is statistically the day of the week that experiences the fewest delays on this flight route. Wednesday has historically seen more delays on average compared to the rest of the week.

Which airline has the best punctuality record on London to Seattle flights?

According to our data, Delta have had the fewest delays on this route over the last 12 months, with about 6% of their flights experiencing any sort of delay.

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

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

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

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and stopovers. It is recommended that you verify with the airline you are booking with for travel from London to Seattle/Tacoma Intl Airport.

What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

The travel and health documents you'll need for your trip to Seattle/Tacoma Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's licence and a passport that is valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

€439 Cheap Flights from London to Seattle in 2025/26

Q: What is the typical price of a round-trip flight between London and Seattle?

Prices are currently low for flights on this route. Typical prices usually range from €539 to €787. The lowest price recently found on this route was €470.

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Find the cheapest flights from London to Seattle

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One-way

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Enter your travel dates to find the best prices.

14:30 - 19:16

LHR

SEA

12h 46m1 stop

05:45 - 11:50

SEA

LHR

22h 05m1 stop

€470United Airlines

Tue, 27 Jan - Fri, 13 Feb

06:00 - 22:43

LHR

SEA

24h 43m2 stops

12:35 - 17:50

SEA

LHR

21h 15m2 stops

€472SWISS

Mon, 12 Jan - Mon, 26 Jan

16:00 - 08:55

LHR

SEA

24h 55m1 stop

16:45 - 10:30

SEA

LHR

9h 45mdirect

€473Delta

Tue, 6 Jan - Tue, 3 Mar

10:25 - 22:43

LHR

SEA

20h 18m1 stop

07:00 - 05:55

SEA

LHR

14h 55m1 stop

€475Multiple Airlines

Thu, 8 Jan - Wed, 4 Mar

08:50 - 16:59

LHR

SEA

16h 09m1 stop

13:35 - 06:50

SEA

LHR

9h 15mdirect

€476British Airways

Mon, 25 May - Mon, 1 Jun

20:00 - 11:19

LHR

SEA

23h 19m1 stop

07:30 - 06:50

SEA

LHR

15h 20m1 stop

€477Delta

Wed, 7 Jan - Wed, 4 Mar

17:25 - 22:07

LHR

SEA

36h 42m2 stops

07:15 - 10:25

SEA

LHR

19h 10m1 stop

€478British Airways

Mon, 12 Jan - Sat, 7 Mar

11:55 - 17:00

LGW

SEA

13h 05m1 stop

14:35 - 10:55

SEA

LGW

12h 20m1 stop

€491Icelandair

Mon, 19 Jan - Wed, 28 Jan

11:55 - 17:00

LGW

SEA

13h 05m1 stop

14:35 - 10:55

SEA

LGW

12h 20m1 stop

€500Icelandair

Mon, 26 Jan - Wed, 11 Feb

13:00 - 22:12

LGW

SEA

17h 12m1 stop

14:44 - 06:00

SEA

LGW

31h 16m1 stop

€595Multiple Airlines

Sun, 1 Mar - Tue, 3 Mar

Finnair flights from London to Seattle

Our best Finnair deals on London to Seattle flight tickets

Finnair

18 Feb

LHR08:20London Heathrow

21h 41m

1 stop

SEA22:01Seattle/Tacoma Intl

25 Feb

SEA18:50Seattle/Tacoma Intl

9h 30m

LHR12:20London Heathrow

€502

Find similar

Finnair

24 Feb

LHR16:30London Heathrow

35h 01m

1 stop

SEA19:31Seattle/Tacoma Intl

3 Mar

SEA13:25Seattle/Tacoma Intl

9h 35m

LHR07:00London Heathrow

€505

Find similar

Finnair

18 Feb

LHR14:55London Heathrow

10h 00m

SEA16:55Seattle/Tacoma Intl

23 Feb

SEA18:50Seattle/Tacoma Intl

9h 30m

LHR12:20London Heathrow

€510

Find similar

British Airways flights from London to Seattle

Our best British Airways deals on London to Seattle flight tickets

British Airways

25 May

LHR08:50London Heathrow

16h 09m

1 stop

SEA16:59Seattle/Tacoma Intl

1 Jun

SEA13:35Seattle/Tacoma Intl

9h 15m

LHR06:50London Heathrow

€476

Find similar

British Airways

12 Jan

LHR17:25London Heathrow

36h 42m

2 stops

SEA22:07Seattle/Tacoma Intl

7 Mar

SEA07:15Seattle/Tacoma Intl

19h 10m

1 stop

LHR10:25London Heathrow

€478

Find similar

British Airways

31 Mar

LHR16:30London Heathrow

9h 55m

SEA18:25Seattle/Tacoma Intl

15 Apr

SEA13:35Seattle/Tacoma Intl

9h 15m

LHR06:50London Heathrow

€479

Find similar

Fly from

Fly to

Route

Depart

Return

Price

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 27/1

14:30-19:16

1 stop12h 46m

Seattle/Tacoma Intl

Fri 13/2

05:45-11:50

1 stop22h 05m

€470

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 12/1

06:00-22:43

2 stops24h 43m

Seattle/Tacoma Intl

Mon 26/1

12:35-17:50

2 stops21h 15m

€472

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 6/1

16:00-08:55

1 stop24h 55m

Seattle/Tacoma Intl

Tue 3/3

16:45-10:30

Nonstop9h 45m

€473

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 8/1

10:25-22:43

1 stop20h 18m

Seattle/Tacoma Intl

Wed 4/3

07:00-05:55

1 stop14h 55m

€475

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 25/5

08:50-16:59

1 stop16h 09m

Seattle/Tacoma Intl

Mon 1/6

13:35-06:50

Nonstop9h 15m

€476

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 7/1

20:00-11:19

1 stop23h 19m

Seattle/Tacoma Intl

Wed 4/3

07:30-06:50

1 stop15h 20m

€477

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 12/1

17:25-22:07

2 stops36h 42m

Seattle/Tacoma Intl

Sat 7/3

07:15-10:25

1 stop19h 10m

€478

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Mon 19/1

11:55-17:00

1 stop13h 05m

Seattle/Tacoma Intl

Wed 28/1

14:35-10:55

1 stop12h 20m

€491

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Mon 26/1

11:55-17:00

1 stop13h 05m

Seattle/Tacoma Intl

Wed 11/2

14:35-10:55

1 stop12h 20m

€500

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Sun 1/3

13:00-22:12

1 stop17h 12m

Seattle/Tacoma Intl

Tue 3/3

14:44-06:00

1 stop31h 16m

€595

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 London to Seattle

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

Delays

Other information

What is the typical price of a round-trip flight between London and Seattle?

What is the cheapest month to fly to Seattle?

If you’re not able to fly to Seattle in February, then January is your next best option. Flight prices from London to Seattle during January average around €551.

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

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

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

You are more likely to see cheaper flights to Seattle from London when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around €645 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from London for as low as €593 on momondo.

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

There are 2 cabin classes available to choose from on London to Seattle/Tacoma Intl 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 London to Seattle flights?

You could potentially save up to 71% on your flight if you consider stops on a London to Seattle flight.

How have London to Seattle flight prices changed over time?

As of December 2025, prices for London to Seattle flights are approximately 15% more expensive when compared to flights at the same time last year.

When to book flights from London to Seattle

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

Estimated return price

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

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

Fastest flight time	9h 45m
Direct flights	Every day
Airports in Seattle	1 airport

The fastest flight from London to Seattle takes 9h 45m

Direct flights go from London to Seattle every day.

There is 1 airport in Seattle. From London there are direct flights to Seattle/Tacoma Intl (SEA).

Search flight deals

How far is London to Seattle/Tacoma Intl by plane?
Seattle/Tacoma Intl is 7694.7 km away from London. Flights usually cover this in 9h 45m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from London to Seattle/Tacoma Intl Airport?
Prices for flights from London to Seattle/Tacoma Intl Airport were last updated today.
How old do you have to be to fly from London to Seattle/Tacoma Intl Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and stopovers. It is recommended that you verify with the airline you are booking with for travel from London to Seattle/Tacoma Intl Airport.
What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?
The travel and health documents you'll need for your trip to Seattle/Tacoma Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's licence and a passport that is valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from London to Seattle?
momondo data reveals that the most frequently booked plane model on the route from London to Seattle is Boeing 787-9 Dreamliner, representing 34.22% of all bookings. The subsequent popular models are Boeing 787-10 Dreamliner at 17.82%, Airbus A330-200 at 14.72%, and Boeing 777 at 10.28%.

Aberdeen

Lynnwood

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from London to Seattle for you.

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

Flights from London to Seattle 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 London to Seattle?

momondo provides multiple filters to help you find the best flight to Seattle from London. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

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

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Cheap flights from London to Seattle from €439

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London to Seattle departing on 11/2. 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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Our best Finnair deals on London to Seattle flight tickets

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Our best British Airways deals on London to Seattle flight tickets

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Use the filters below to find and compare flights from London to Seattle that are best for you.

See travel insights to Seattle from

How to get the cheapest flight ticket from London to Seattle

What is the typical price of a round-trip flight between London and Seattle?

What is the cheapest month to fly to Seattle?

If you’re not able to fly to Seattle in February, then January is your next best option. Flight prices from London to Seattle during January average around €551.

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

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

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

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

There are 2 cabin classes available to choose from on London to Seattle/Tacoma Intl 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 London to Seattle flights?

You could potentially save up to 71% on your flight if you consider stops on a London to Seattle flight.

How have London to Seattle flight prices changed over time?

As of December 2025, prices for London to Seattle flights are approximately 15% more expensive when compared to flights at the same time last year.

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

Finnair, Lufthansa, and United Airlines are the most popular carriers operating from London to Seattle/Tacoma Intl

How often are flights from London to Seattle delayed?

Historically, on average around 13% of flights between London and Seattle have experienced a delay on any given week. The average delay length over the past 12 months has been 119 minutes.

What is the most punctual flight time for London to Seattle flights?

Generally, flights departing in the evening tend to experience fewer delays. Flights departing in the early afternoon have, in the past, seen delays more frequently in comparison.

What day of the week experiences the fewest flight delays on this route?

Tuesday is statistically the day of the week that experiences the fewest delays on this flight route. Wednesday has historically seen more delays on average compared to the rest of the week.

Which airline has the best punctuality record on London to Seattle flights?

According to our data, Delta have had the fewest delays on this route over the last 12 months, with about 6% of their flights experiencing any sort of delay.

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

12 flights are operational daily from London to Seattle as of December 2025. The most popular departure time for this route is 12:00, with 73% of flights per day taking off in the afternoon.

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

As of December 2025, there are 89 flights per week flying from London to Seattle. The most common day of the week flights depart is Mon, with 17% of flights taking off on this day.

When to book flights from London to Seattle

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

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

Fastest flight time

Direct flights

Airports in Seattle

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

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

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

What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

What is the most popular plane model from London to Seattle?

Travelling to a place near Seattle?

Why use momondo?

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

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

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

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

An easier way to manage your Seattle 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 States

Airports servicing Washington