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.

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 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 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.

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

14 flights are operational daily from London to Seattle as of December 2025. The most popular departure time for this route is 12:00, with 77% of flights per day taking off in the afternoon.

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

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

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

As of December 2025, there are 102 flights per week flying from London to Seattle. The most common day of the week flights depart is Tue, with 21% of flights taking off on this day.

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.

€450 Cheap Flights from London to Seattle in 2025/26

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09:25 - 12:30

LHR

SEA

10h 05mdirect

22:55 - 20:00

SEA

LHR

14h 05m1 stop

€506Multiple Airlines

Sat, 14 Mar - Mon, 23 Mar

09:25 - 12:30

LHR

SEA

10h 05mdirect

19:50 - 12:20

SEA

LHR

9h 30mdirect

€508Multiple Airlines

Sat, 21 Mar - Thu, 26 Mar

06:20 - 13:20

LHR

SEA

15h 00m1 stop

16:55 - 10:30

SEA

LHR

9h 35mdirect

€512Multiple Airlines

Sun, 1 Feb - Sun, 8 Feb

11:20 - 13:20

LHR

SEA

10h 00mdirect

15:35 - 09:00

SEA

LHR

9h 25mdirect

€514Delta

Sat, 11 Apr - Mon, 20 Apr

14:55 - 16:55

LHR

SEA

10h 00mdirect

18:50 - 12:20

SEA

LHR

9h 30mdirect

€515British Airways

Fri, 23 Jan - Wed, 28 Jan

09:50 - 11:35

LHR

SEA

9h 45mdirect

20:20 - 13:45

SEA

LHR

9h 25mdirect

€516Multiple Airlines

Sun, 19 Apr - Thu, 30 Apr

12:20 - 14:45

LHR

SEA

10h 25mdirect

16:55 - 10:30

SEA

LHR

9h 35mdirect

€522Virgin Atlantic

Sun, 1 Feb - Sun, 8 Feb

14:55 - 16:55

LHR

SEA

10h 00mdirect

08:35 - 06:50

SEA

LHR

14h 15m1 stop

€522British Airways

Thu, 22 Jan - Mon, 26 Jan

12:35 - 22:20

LHR

SEA

17h 45m1 stop

18:50 - 12:20

SEA

LHR

9h 30mdirect

€527British Airways

Thu, 29 Jan - Sat, 14 Feb

07:30 - 23:43

LHR

SEA

24h 13m2 stops

07:00 - 06:50

SEA

LHR

15h 50m1 stop

€529Finnair

Thu, 12 Feb - Tue, 17 Feb

British Airways flights from London to Seattle

Our best British Airways deals on London to Seattle flight tickets

British Airways

23 Jan

LHR14:55London Heathrow

10h 00m

SEA16:55Seattle/Tacoma Intl

28 Jan

SEA18:50Seattle/Tacoma Intl

9h 30m

LHR12:20London Heathrow

€515

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British Airways

22 Jan

LHR14:55London Heathrow

10h 00m

SEA16:55Seattle/Tacoma Intl

26 Jan

SEA08:35Seattle/Tacoma Intl

14h 15m

1 stop

LHR06:50London Heathrow

€522

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British Airways

29 Jan

LHR12:35London Heathrow

17h 45m

1 stop

SEA22:20Seattle/Tacoma Intl

14 Feb

SEA18:50Seattle/Tacoma Intl

9h 30m

LHR12:20London Heathrow

€527

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Icelandair flights from London to Seattle

Our best Icelandair deals on London to Seattle flight tickets

Icelandair

19 Jan

LGW11:55London Gatwick

13h 05m

1 stop

SEA17:00Seattle/Tacoma Intl

26 Jan

SEA14:35Seattle/Tacoma Intl

12h 20m

1 stop

LGW10:55London Gatwick

€548

Find similar

Icelandair

18 Jan

LHR20:35London Heathrow

28h 25m

1 stop

SEA17:00Seattle/Tacoma Intl

24 Jan

SEA14:35Seattle/Tacoma Intl

12h 15m

1 stop

LHR10:50London Heathrow

€563

Find similar

Icelandair

18 Jan

LGW11:55London Gatwick

13h 05m

1 stop

SEA17:00Seattle/Tacoma Intl

26 Jan

SEA14:35Seattle/Tacoma Intl

12h 20m

1 stop

LGW10:55London Gatwick

€568

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Fly from

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Route

Depart

Return

Price

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 14/3

09:25-12:30

Nonstop10h 05m

Seattle/Tacoma Intl

Mon 23/3

22:55-20:00

1 stop14h 05m

€506

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 21/3

09:25-12:30

Nonstop10h 05m

Seattle/Tacoma Intl

Thu 26/3

19:50-12:20

Nonstop9h 30m

€508

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 1/2

06:20-13:20

1 stop15h 00m

Seattle/Tacoma Intl

Sun 8/2

16:55-10:30

Nonstop9h 35m

€512

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 11/4

11:20-13:20

Nonstop10h 00m

Seattle/Tacoma Intl

Mon 20/4

15:35-09:00

Nonstop9h 25m

€514

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 23/1

14:55-16:55

Nonstop10h 00m

Seattle/Tacoma Intl

Wed 28/1

18:50-12:20

Nonstop9h 30m

€515

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 19/4

09:50-11:35

Nonstop9h 45m

Seattle/Tacoma Intl

Thu 30/4

20:20-13:45

Nonstop9h 25m

€516

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 1/2

12:20-14:45

Nonstop10h 25m

Seattle/Tacoma Intl

Sun 8/2

16:55-10:30

Nonstop9h 35m

€522

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 22/1

14:55-16:55

Nonstop10h 00m

Seattle/Tacoma Intl

Mon 26/1

08:35-06:50

1 stop14h 15m

€522

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 29/1

12:35-22:20

1 stop17h 45m

Seattle/Tacoma Intl

Sat 14/2

18:50-12:20

Nonstop9h 30m

€527

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 12/2

07:30-23:43

2 stops24h 13m

Seattle/Tacoma Intl

Tue 17/2

07:00-06:50

1 stop15h 50m

€529

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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 January, then February is your next best option. Flight prices from London to Seattle during February average around €556.

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 €650 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 €596 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	10h 29m
Direct flights	Every day
Airports in Seattle	1 airport

The fastest flight from London to Seattle takes 10h 29m

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).

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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 10h 29m, 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 33.54% of all bookings. The subsequent popular models are Boeing 787-10 Dreamliner at 18.31%, Airbus A330-200 at 14.85%, and Airbus A330-900neo at 10.51%.

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 €450

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 13/2. 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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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 January, then February is your next best option. Flight prices from London to Seattle during February average around €556.

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?

Lufthansa, United Airlines, and JetBlue 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?

14 flights are operational daily from London to Seattle as of December 2025. The most popular departure time for this route is 12:00, with 77% 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 102 flights per week flying from London to Seattle. The most common day of the week flights depart is Tue, with 21% 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