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

As of February 2026, there are 93 flights per week flying from London to Seattle. The most common day of the week flights depart is Sat, with 23% of flights taking off on this day.

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

Icelandair, SWISS, and British Airways 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?

Thursday is statistically the day of the week that experiences the fewest delays on this flight route. Monday 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 5% of their flights experiencing any sort of delay.

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

13 flights are operational daily from London to Seattle as of February 2026. The most popular departure time for this route is 14:00, with 87% 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.

How often are flights from London to Seattle delayed?

Historically, on average around 12% 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 128 minutes.

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.

€394 Cheap Flights from London to Seattle in 2026

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

Prices are currently typical for flights on this route. Typical prices usually range from €453 to €634. The lowest price recently found on this route was €453.

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15:40 - 20:40

LGW

SEA

13h 00m

1 stop

15:40 - 14:40

SEA

LGW

15h 00m

1 stop

€453Icelandair

Thu, 9 Apr - Mon, 20 Apr

15:40 - 20:40

LGW

SEA

13h 00m

1 stop

19:00 - 14:40

SEA

LGW

11h 40m

1 stop

€460Icelandair

Wed, 8 Apr - Tue, 12 May

15:40 - 20:40

LGW

SEA

13h 00m

1 stop

19:00 - 14:40

SEA

LGW

11h 40m

1 stop

€464Icelandair

Wed, 8 Apr - Tue, 5 May

11:55 - 18:00

LGW

SEA

13h 05m

1 stop

15:40 - 14:40

SEA

LGW

15h 00m

1 stop

€467Icelandair

Mon, 16 Mar - Thu, 7 May

11:55 - 17:00

LGW

SEA

13h 05m

1 stop

19:00 - 14:40

SEA

LGW

11h 40m

1 stop

€481Icelandair

Mon, 2 Mar - Wed, 22 Apr

11:55 - 17:00

LGW

SEA

13h 05m

1 stop

14:35 - 10:55

SEA

LGW

12h 20m

1 stop

€486Icelandair

Tue, 24 Feb - Tue, 3 Mar

11:55 - 18:00

LGW

SEA

13h 05m

1 stop

15:40 - 11:45

SEA

LGW

12h 05m

1 stop

€488Icelandair

Mon, 9 Mar - Mon, 4 May

15:40 - 20:40

LGW

SEA

13h 00m

1 stop

19:00 - 14:40

SEA

LGW

11h 40m

1 stop

€489Icelandair

Mon, 4 May - Fri, 8 May

11:55 - 17:00

LGW

SEA

13h 05m

1 stop

19:00 - 11:45

SEA

LGW

32h 45m

1 stop

€490Icelandair

Mon, 2 Mar - Thu, 30 Apr

15:40 - 20:40

LGW

SEA

13h 00m

1 stop

19:00 - 14:40

SEA

LGW

11h 40m

1 stop

€511Icelandair

Tue, 7 Apr - Mon, 20 Apr

Scandinavian Airlines flights from London to Seattle

Our best Scandinavian Airlines deals on London to Seattle flight tickets

Scandinavian Airlines

30 May

LHR06:40London Heathrow

15h 05m

1 stop

SEA13:45Seattle/Tacoma Intl

13 Jun

SEA15:55Seattle/Tacoma Intl

16h 30m

2 stops

LHR16:25London Heathrow

€574

Scandinavian Airlines

22 May

LHR06:40London Heathrow

15h 05m

2 stops

SEA13:45Seattle/Tacoma Intl

26 May

SEA15:55Seattle/Tacoma Intl

18h 55m

2 stops

LHR18:50London Heathrow

€581

Scandinavian Airlines

11 Jun

LHR19:30London Heathrow

26h 15m

1 stop

SEA13:45Seattle/Tacoma Intl

16 Jun

SEA15:55Seattle/Tacoma Intl

18h 55m

2 stops

LHR18:50London Heathrow

€613

United Airlines flights from London to Seattle

Our best United Airlines deals on London to Seattle flight tickets

United Airlines

9 Mar

LHR09:30London Heathrow

18h 28m

2 stops

SEA20:58Seattle/Tacoma Intl

19 Mar

SEA08:00Seattle/Tacoma Intl

19h 25m

2 stops

LHR10:25London Heathrow

€618

United Airlines

9 Mar

LHR14:30London Heathrow

15h 27m

1 stop

SEA22:57Seattle/Tacoma Intl

24 Mar

SEA12:55Seattle/Tacoma Intl

13h 45m

1 stop

LHR09:40London Heathrow

€629

United Airlines

4 Mar

LHR07:30London Heathrow

18h 33m

2 stops

SEA18:03Seattle/Tacoma Intl

27 Apr

SEA08:00Seattle/Tacoma Intl

18h 25m

2 stops

LHR10:25London Heathrow

€631

Fly from

Fly to

Route

Depart

Return

Price

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Thu 9/4

15:40-20:40

1 stop13h 00m

Seattle/Tacoma Intl

Mon 20/4

15:40-14:40

1 stop15h 00m

€453

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Wed 8/4

15:40-20:40

1 stop13h 00m

Seattle/Tacoma Intl

Tue 12/5

19:00-14:40

1 stop11h 40m

€460

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Wed 8/4

15:40-20:40

1 stop13h 00m

Seattle/Tacoma Intl

Tue 5/5

19:00-14:40

1 stop11h 40m

€464

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Mon 16/3

11:55-18:00

1 stop13h 05m

Seattle/Tacoma Intl

Thu 7/5

15:40-14:40

1 stop15h 00m

€467

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Mon 2/3

11:55-17:00

1 stop13h 05m

Seattle/Tacoma Intl

Wed 22/4

19:00-14:40

1 stop11h 40m

€481

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Tue 24/2

11:55-17:00

1 stop13h 05m

Seattle/Tacoma Intl

Tue 3/3

14:35-10:55

1 stop12h 20m

€486

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Mon 9/3

11:55-18:00

1 stop13h 05m

Seattle/Tacoma Intl

Mon 4/5

15:40-11:45

1 stop12h 05m

€488

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Mon 4/5

15:40-20:40

1 stop13h 00m

Seattle/Tacoma Intl

Fri 8/5

19:00-14:40

1 stop11h 40m

€489

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Mon 2/3

11:55-17:00

1 stop13h 05m

Seattle/Tacoma Intl

Thu 30/4

19:00-11:45

1 stop32h 45m

€490

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Tue 7/4

15:40-20:40

1 stop13h 00m

Seattle/Tacoma Intl

Mon 20/4

19:00-14:40

1 stop11h 40m

€511

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 €546.

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 €636 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 February 2026, prices for London to Seattle flights are approximately 5% 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 25.92% of all bookings. The subsequent popular models are Boeing 787-10 Dreamliner at 18.79%, Airbus A330-900neo at 12.67%, and Boeing 777-300ER at 11.81%.

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 €394

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 5/5. 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 Scandinavian Airlines deals on London to Seattle flight tickets

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Our best United Airlines 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

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 €546.

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 February 2026, prices for London to Seattle flights are approximately 5% 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?

Icelandair, SWISS, and British Airways 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 12% 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 128 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?

Thursday is statistically the day of the week that experiences the fewest delays on this flight route. Monday 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 5% of their flights experiencing any sort of delay.

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

13 flights are operational daily from London to Seattle as of February 2026. The most popular departure time for this route is 14:00, with 87% of flights per day taking off in the afternoon.

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

As of February 2026, there are 93 flights per week flying from London to Seattle. The most common day of the week flights depart is Sat, with 23% 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

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Popular Cities in the United States

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