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.

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

British Airways, SWISS, and Finnair 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 117 minutes.

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

As of November 2025, there are 78 flights per week flying from London to Seattle. The most common day of the week flights depart is Sat, with 27% of flights taking off on this day.

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

11 flights are operational daily from London to Seattle as of November 2025. The most popular departure time for this route is 12:00, with 88% of flights per day taking off in the afternoon.

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.

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.

€477 Cheap Flights from London to Seattle in 2025/26

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06:30 - 11:50LHR-SEA

13h 20m1 stop

11:17 - 10:55SEA-LHR

15h 38m1 stop

€551Delta

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Tue, 20 Jan - Sat, 7 Feb

14:55 - 16:55LHR-SEA

10h 00mdirect

18:50 - 12:20SEA-LHR

9h 30mdirect

€559Finnair

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Fri, 13 Feb - Thu, 19 Feb

14:55 - 16:55LHR-SEA

10h 00mdirect

13:39 - 10:25SEA-LHR

12h 46m1 stop

€560British Airways

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Fri, 13 Feb - Thu, 19 Feb

06:30 - 11:50LHR-SEA

13h 20m1 stop

16:55 - 10:30SEA-LHR

9h 35mdirect

€561Delta

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Tue, 20 Jan - Tue, 3 Feb

13:10 - 22:07LHR-SEA

16h 57m1 stop

13:25 - 07:00SEA-LHR

9h 35mdirect

€565British Airways

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Thu, 15 Jan - Tue, 20 Jan

13:00 - 20:00LGW-SEA

38h 00m1 stop

22:55 - 06:00SEA-LGW

24h 05m1 stop

€587Multiple Airlines

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Tue, 10 Mar - Sun, 22 Mar

14:00 - 10:33LGW-SEA

28h 33m1 stop

15:29 - 10:00SEA-LGW

34h 31m1 stop

€596Multiple Airlines

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Mon, 19 Jan - Sun, 25 Jan

11:55 - 08:58LGW-SEA

29h 03m2 stops

14:35 - 10:55SEA-LGW

12h 20m1 stop

€662Icelandair

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Wed, 28 Jan - Sun, 1 Feb

10:20 - 15:40LGW-SEA

13h 20m1 stop

17:40 - 14:35SEA-LGW

12h 55m1 stop

€671Condor

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Thu, 23 Apr - Thu, 23 Apr

10:20 - 15:40LGW-SEA

13h 20m1 stop

17:40 - 14:35SEA-LGW

12h 55m1 stop

€721Condor

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Thu, 21 May - Thu, 28 May

Delta flights from London to Seattle

Our best Delta deals on London to Seattle flight tickets

Delta

20 Jan

LHR06:30London Heathrow

13h 20m

1 stop

SEA11:50Seattle/Tacoma Intl

7 Feb

SEA09:30Seattle/Tacoma Intl

15h 30m

2 stops

LHR09:00London Heathrow

€551

Find similar

Delta

20 Jan

LHR06:30London Heathrow

13h 20m

1 stop

SEA11:50Seattle/Tacoma Intl

3 Feb

SEA16:55Seattle/Tacoma Intl

9h 35m

LHR10:30London Heathrow

€561

Find similar

Delta

21 Jan

LHR06:30London Heathrow

13h 20m

1 stop

SEA11:50Seattle/Tacoma Intl

4 Feb

SEA16:55Seattle/Tacoma Intl

9h 35m

LHR10:30London Heathrow

€564

Find similar

Finnair flights from London to Seattle

Our best Finnair deals on London to Seattle flight tickets

Finnair

13 Feb

LHR09:25London Heathrow

10h 05m

SEA11:30Seattle/Tacoma Intl

19 Feb

SEA18:50Seattle/Tacoma Intl

9h 30m

LHR12:20London Heathrow

€559

Find similar

Finnair

20 Feb

LHR10:35London Heathrow

16h 57m

1 stop

SEA19:32Seattle/Tacoma Intl

6 Mar

SEA18:50Seattle/Tacoma Intl

9h 30m

LHR12:20London Heathrow

€572

Find similar

Finnair

27 Feb

LHR14:55London Heathrow

10h 00m

SEA16:55Seattle/Tacoma Intl

14 Mar

SEA19:50Seattle/Tacoma Intl

9h 30m

LHR12:20London Heathrow

€573

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Fly from

Fly to

Route

Depart

Return

Price

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 20/1

06:30-11:50

1 stop13h 20m

Seattle/Tacoma Intl

Sat 7/2

11:17-10:55

1 stop15h 38m

€551

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 13/2

14:55-16:55

Nonstop10h 00m

Seattle/Tacoma Intl

Thu 19/2

18:50-12:20

Nonstop9h 30m

€559

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 13/2

14:55-16:55

Nonstop10h 00m

Seattle/Tacoma Intl

Thu 19/2

13:39-10:25

1 stop12h 46m

€560

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 20/1

06:30-11:50

1 stop13h 20m

Seattle/Tacoma Intl

Tue 3/2

16:55-10:30

Nonstop9h 35m

€561

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 15/1

13:10-22:07

1 stop16h 57m

Seattle/Tacoma Intl

Tue 20/1

13:25-07:00

Nonstop9h 35m

€565

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Tue 10/3

13:00-20:00

1 stop38h 00m

Seattle/Tacoma Intl

Sun 22/3

22:55-06:00

1 stop24h 05m

€587

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Mon 19/1

14:00-10:33

1 stop28h 33m

Seattle/Tacoma Intl

Sun 25/1

15:29-10:00

1 stop34h 31m

€596

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Wed 28/1

11:55-08:58

2 stops29h 03m

Seattle/Tacoma Intl

Sun 1/2

14:35-10:55

1 stop12h 20m

€662

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Thu 23/4

10:20-15:40

1 stop13h 20m

Seattle/Tacoma Intl

Thu 23/4

17:40-14:35

1 stop12h 55m

€671

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Thu 21/5

10:20-15:40

1 stop13h 20m

Seattle/Tacoma Intl

Thu 28/5

17:40-14:35

1 stop12h 55m

€721

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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 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 €581.

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 €674 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 €614 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 November 2025, prices for London to Seattle flights are approximately 14% 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 near Seattle: 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 27.00% of all bookings. The subsequent popular models are Boeing 787-10 Dreamliner at 23.51%, Airbus A330-900neo at 20.29%, and Airbus A330-200 at 10.91%.

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 €477

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 23/1. 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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Delta flights from London to Seattle

Our best Delta deals on London to Seattle flight tickets

Finnair flights from London to Seattle

Our best Finnair deals on London to Seattle flight tickets

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See travel insights to Seattle from

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

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 €581.

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 November 2025, prices for London to Seattle flights are approximately 14% 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?

British Airways, SWISS, and Finnair 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 117 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?

11 flights are operational daily from London to Seattle as of November 2025. The most popular departure time for this route is 12:00, with 88% of flights per day taking off in the afternoon.

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

As of November 2025, there are 78 flights per week flying from London to Seattle. The most common day of the week flights depart is Sat, with 27% 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