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

Flights via Frankfurt am Main (FRA) offer the lowest average return price of £391.

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

The number of flights available between London and Seattle is 18 per day as of September 2025. The most frequent departure time is 16:00, with 67% of daily flights leaving in the afternoon.

Which airlines fly to Seattle?

Virgin Atlantic, British Airways and Icelandair are the top three most popular airlines that fly to Seattle from London according to our data. Virgin Atlantic is the first choice among our users, with 49% of people opting to fly with this airline when travelling to Seattle. Keep in mind that there are 14 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

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

Reykjavik (KEF) was the most common stop: 77% of momondo users choosing one-stop flights on this route connected there.

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

Flights connecting via Dublin (DUB) have the shortest average one-way travel time: 12h 55m.

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

American Airlines, Finnair, and Aer Lingus are the most popular carriers operating from London to Seattle/Tacoma Intl

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

The number of flights available between London and Seattle is 131 per week as of September 2025. The most frequent departure day is Mon, with 16% of weekly flights leaving on this day.

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

Munich (MUC) has the shortest average stopover time for this route: 1h 25m.

Which airlines fly direct from London to Seattle?

If you're looking for a non-stop flight from London to Seattle, there are currently two airlines that offer direct flights: British Airways and Delta Air Lines. Both airlines operate daily flights between the two cities, providing a convenient option for travellers who want to reach Seattle quickly and efficiently. British Airways operates direct flights from London Heathrow Airport (LHR) to Seattle-Tacoma International Airport (SEA), with a flight time of approximately 9h 45min. Delta Air Lines, on the other hand, operates direct flights from London Gatwick Airport (LGW) to SEA, with a flight time of approximately 9h 15min. If you're willing to take a connecting flight, several other airlines operate flights between London and Seattle with layovers, including Icelandair, Air France, KLM, and Lufthansa. These airlines typically have layovers in cities such as Reykjavik, Paris, Amsterdam, or Frankfurt. What is the best way to get in and out of airports in London and Seattle? Getting to and from London's airports is relatively easy and convenient. London Heathrow Airport (LHR) and London Gatwick Airport (LGW) are both well-connected to the city centre by public transport, taxi, and rideshare services. For LHR, the fastest and most convenient way to get to the airport is by taking the Heathrow Express, which runs from London Paddington Station to Heathrow Airport in just 15 minutes. Alternatively, you can take the London Underground, the Piccadilly Line connects directly with Heathrow terminals 1-5. If you prefer a more comfortable and convenient option, taxis and rideshare services are also available from various points in the city. For LGW, the Gatwick Express is a popular choice, providing a fast and direct link to the airport from London Victoria Station. The journey takes around 30 minutes. Alternatively, you can take the Thameslink train, which connects Gatwick Airport with central London and beyond, or take a taxi or a rideshare service. When it comes to getting from Seattle-Tacoma International Airport (SEA) to downtown Seattle, there are several transportation options available, including taxis, rideshare services, and the Sound Transit Light Rail. The Light Rail provides an affordable and efficient way to reach downtown Seattle and other destinations, with a journey time of approximately 40 minutes. Hire cars are also available at the airport, with several major car rental companies operating at the airport. What are the benefits of the different airports in London and Seattle? London is served by several airports, each with its own advantages and disadvantages. London Heathrow (LHR) is the largest and busiest airport in the UK, offering excellent connectivity to destinations worldwide. London Gatwick (LGW) is another popular airport, particularly for travellers heading to destinations in Europe and beyond. London City Airport (LCY) is the closest airport to central London, providing quick and easy access to the city's financial district. Seattle-Tacoma International Airport (SEA) is the largest airport in the Pacific Northwest region of the United States, providing easy access to Seattle and the surrounding area. The airport is well-equipped with modern facilities and a range of amenities, including restaurants, shops, and lounges. The airport has 5 lounges that include The Club at SEA, Delta Sky Club, Alaska Lounge, United Club and Centurion Lounge. Some other benefits to SEA include its focus on sustainable practises and being the leader in innovation, which is known for its innovative approaches to improving the passenger experience. Which cities can you get to from Seattle Airport? Seattle-Tacoma International Airport (SEA) is the largest airport in the Pacific Northwest and offers flights to many destinations both domestically and internationally. The airport is a hub for Alaska Airlines and Delta Air Lines and also serves a number of other airlines. Domestically, passengers can fly non-stop to many major US cities, including Los Angeles, San Francisco, New York, Boston, Atlanta, and Chicago, among others. There are also a number of flights to smaller regional airports throughout the Pacific Northwest, such as Portland, Eugene, and Spokane. Internationally, SEA offers direct flights to several destinations in Asia, including Tokyo, Seoul, Beijing, and Shanghai. There are also direct flights to Europe, with destinations such as London and Paris. Other international destinations include Canada, Mexico, and the Caribbean.

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 are updated daily.

How many operators does momondo search for flights from London to Seattle/Tacoma Intl Airport?

As of September 2025, there are 14 operators available to choose from 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?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check 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 license 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.

£369 Cheap Flights from London to Seattle in 2025/26

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Round-trip

One-way

Last minute

Direct

Cheap return flights

11:55 - 18:00LGW-SEA

13h 05m1 stop

14:35 - 10:55SEA-LGW

12h 20m1 stop

£444Icelandair

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mar., 28 oct. - dim., 2 nov.

06:40 - 14:00LHR-SEA

15h 20m1 stop

16:20 - 15:35SEA-LHR

39h 15m2 stops

£444Scandinavian Airlines

Find Deal

ven., 17 oct. - ven., 24 oct.

09:25 - 12:30LHR-SEA

10h 05mdirect

10:01 - 06:50SEA-LHR

13h 49m1 stop

£444British Airways

Find Deal

mar., 10 mars - mar., 17 mars

17:00 - 13:23LHR-SEA

28h 23m2 stops

13:56 - 12:00SEA-LHR

14h 04m1 stop

£447Finnair

Find Deal

mar., 24 févr. - mar., 3 mars

14:55 - 17:55LHR-SEA

10h 00mdirect

19:50 - 12:20SEA-LHR

9h 30mdirect

£450British Airways

Find Deal

mar., 10 mars - mar., 17 mars

12:20 - 15:45LHR-SEA

10h 25mdirect

16:48 - 10:30SEA-LHR

9h 42mdirect

£453Virgin Atlantic

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mer., 29 oct. - mer., 5 nov.

13:25 - 15:30LHR-SEA

10h 05mdirect

07:19 - 08:50SEA-LHR

17h 31m1 stop

£455Virgin Atlantic

Find Deal

mer., 8 oct. - mar., 14 oct.

09:45 - 20:46LHR-SEA

19h 01m2 stops

00:34 - 10:30SEA-LHR

25h 56m1 stop

£458Finnair

Find Deal

mer., 8 oct. - lun., 13 oct.

08:40 - 16:05LCY-SEA

15h 25m1 stop

14:10 - 16:40SEA-LCY

18h 30m1 stop

£493KLM

Find Deal

mer., 8 oct. - lun., 13 oct.

20:45 - 11:45LCY-SEA

23h 00m1 stop

17:40 - 16:40SEA-LCY

15h 00m1 stop

£547KLM

Find Deal

dim., 28 sept. - dim., 12 oct.

Icelandair flights from London to Seattle

Our best Icelandair deals on London to Seattle flight tickets

Icelandair

28 Oct

LGW11:55London Gatwick

13h 05m

1 stop

SEA18:00Seattle/Tacoma Intl

2 Nov

SEA14:35Seattle/Tacoma Intl

12h 20m

1 stop

LGW10:55London Gatwick

£444

Find similar

Icelandair

5 Nov

LHR12:15London Heathrow

12h 45m

1 stop

SEA17:00Seattle/Tacoma Intl

15 Mar

SEA15:35Seattle/Tacoma Intl

12h 15m

1 stop

LHR10:50London Heathrow

£446

Find similar

Icelandair

3 Nov

LHR20:35London Heathrow

28h 25m

1 stop

SEA17:00Seattle/Tacoma Intl

14 Mar

SEA15:35Seattle/Tacoma Intl

20h 55m

1 stop

LHR19:30London Heathrow

£448

Find similar

Air Canada flights from London to Seattle

Our best Air Canada deals on London to Seattle flight tickets

Air Canada

21 Sept

LHR14:10London Heathrow

27h 12m

1 stop

SEA09:22Seattle/Tacoma Intl

28 Sept

SEA07:15Seattle/Tacoma Intl

18h 20m

1 stop

LHR09:35London Heathrow

£450

Find similar

Air Canada

15 Oct

LHR08:40London Heathrow

17h 56m

2 stops

SEA18:36Seattle/Tacoma Intl

22 Oct

SEA14:55Seattle/Tacoma Intl

14h 25m

1 stop

LHR13:20London Heathrow

£451

Find similar

Air Canada

22 Sept

LHR14:10London Heathrow

12h 26m

1 stop

SEA18:36Seattle/Tacoma Intl

6 Oct

SEA07:15Seattle/Tacoma Intl

18h 20m

1 stop

LHR09:35London Heathrow

£452

Find similar

Fly from

Fly to

Route

Depart

Return

Price

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

mar. 28/10

11:55-18:00

1 stop13h 05m

Seattle/Tacoma Intl

dim. 2/11

14:35-10:55

1 stop12h 20m

£444

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

ven. 17/10

06:40-14:00

1 stop15h 20m

Seattle/Tacoma Intl

ven. 24/10

16:20-15:35

2 stops39h 15m

£444

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

mar. 10/3

09:25-12:30

Nonstop10h 05m

Seattle/Tacoma Intl

mar. 17/3

10:01-06:50

1 stop13h 49m

£444

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

mar. 24/2

17:00-13:23

2 stops28h 23m

Seattle/Tacoma Intl

mar. 3/3

13:56-12:00

1 stop14h 04m

£447

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

mar. 10/3

14:55-17:55

Nonstop10h 00m

Seattle/Tacoma Intl

mar. 17/3

19:50-12:20

Nonstop9h 30m

£450

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

mer. 29/10

12:20-15:45

Nonstop10h 25m

Seattle/Tacoma Intl

mer. 5/11

16:48-10:30

Nonstop9h 42m

£453

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

mer. 8/10

13:25-15:30

Nonstop10h 05m

Seattle/Tacoma Intl

mar. 14/10

07:19-08:50

1 stop17h 31m

£455

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

mer. 8/10

09:45-20:46

2 stops19h 01m

Seattle/Tacoma Intl

lun. 13/10

00:34-10:30

1 stop25h 56m

£458

LondonSeattle

LCY - SEA

LCYSEA

London City

mer. 8/10

08:40-16:05

1 stop15h 25m

Seattle/Tacoma Intl

lun. 13/10

14:10-16:40

1 stop18h 30m

£493

LondonSeattle

LCY - SEA

LCYSEA

London City

dim. 28/9

20:45-11:45

1 stop23h 00m

Seattle/Tacoma Intl

dim. 12/10

17:40-16:40

1 stop15h 00m

£547

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

Stopovers

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?

The cheapest month to fly to Seattle from London is in January. Flight prices, which tend to average around £469, are often lower during this time because this is during the off-season. The month of February is another great option to travel to Seattle, with average flight prices from London averaging around £486.

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

According to our data, Wednesday is the cheapest day to fly to Seattle from London. The lowest ticket price found for a Wednesday departure recently was £583. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Be sure to avoid booking your departure on a Sunday as prices are generally higher than usual. According to our data, the average ticket price to Seattle on Sunday is £689.

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

According to our data, the cheapest time of day to fly to Seattle is in the evening. momondo users have found flights departing from London to Seattle in the evening for as low as £519. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the afternoon are often more expensive, with an average ticket price of £618.

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 £565 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 £511 on momondo.

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

There are 4 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?

No. A direct flight is the cheapest option for a flight between London to Seattle.

How have London to Seattle flight prices changed over time?

As of September 2025, prices for London to Seattle flights are approximately 3% cheaper 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

Best price found	£577
Fastest flight time	9h 45m
Direct flights	Every day
Airports in Seattle	1 airport

The best one-way flight to Seattle from London in the past 72 hours is £577. The best return flight deal from London to Seattle found on momondo in the last 72 hours is £513.

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?
A flight from London to Seattle/Tacoma Intl will travel around 4781.3 mi. By plane, this route typically takes 10h 00m.
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 are updated daily.
How many operators does momondo search for flights from London to Seattle/Tacoma Intl Airport?
As of September 2025, there are 14 operators available to choose from 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?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check 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 license 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?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from London to Seattle is Airbus A330-900neo (24.18% of total bookings). The next most popular plane models are Boeing 787-10 Dreamliner (20.19%), Boeing 787-9 Dreamliner (17.79%), and Boeing 777-300ER (13.52%).
What is the most popular airline from London to Seattle?
Based on momondo bookings for this flight route, the most popular airline on flight routes from London to Seattle is Virgin Atlantic (35% of total bookings). The next most popular airlines are British Airways (19%), Icelandair (17%), and KLM (9%).

Best airlines flying from London to Seattle

Compare and see reviews for airlines that fly from London to Seattle with momondo

Airline	Rating	Free Cancellation	Price
Icelandair	PriceFrom £321	Free Cancellation	Rating 7.0 544 reviews	Search Icelandair flights
Air France	PriceFrom £380	Free Cancellation	Rating 7.4 1,469 reviews	Search Air France flights
Lufthansa	PriceFrom £391	Free Cancellation	Rating 6.8 7,407 reviews	Search Lufthansa flights
Finnair	PriceFrom £392	Free Cancellation	Rating 7.6 1,323 reviews	Search Finnair flights
KLM	PriceFrom £399	Free Cancellation	Rating 7.8 1,385 reviews	Search KLM flights
United Airlines	PriceFrom £400	Free Cancellation	Rating 7.4 8,929 reviews	Search United Airlines flights
Aer Lingus	PriceFrom £402	Free Cancellation	Rating 7.2 1,270 reviews	Search Aer Lingus flights
British Airways	PriceFrom £423	Free Cancellation	Rating 6.6 7,361 reviews	Search British Airways flights
Virgin Atlantic	PriceFrom £434	Free Cancellation	Rating 7.4 664 reviews	Search Virgin Atlantic flights
Delta	PriceFrom £439	Free Cancellation	Rating 7.9 7,954 reviews	Search Delta flights

Delta Flights From London to Seattle
Delta flight deals from London to Seattle start from £597 round-trip. Over the 12 Delta flights for this route in a normal week, average airfare is usually £800 round-trip - but some users have found much cheaper deals with momondo.
KLM Flights From London to Seattle
KLM (7.8/10 from 1,385 reviews) operates around 12 flights from London to Seattle in any given week. The average KLM airfare for this route is around £762, with deals from around £543 rare but found on momondo. Referenced prices are for round-trip London to Seattle flight searches in the last 72 hours.

Fife

Tukwila

Renton

SeaTac

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from London to Seattle. momondo saves you time and could save you money on your trip.

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

Yes. momondo allows you to filter the results for London to Seattle flights to just show those with flexible booking policies.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Seattle from London.

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

Yes. momondo can track prices for London to Seattle 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 London to Seattle from £369

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 15/10. 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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Icelandair flights from London to Seattle

Our best Icelandair deals on London to Seattle flight tickets

Air Canada flights from London to Seattle

Our best Air Canada deals on London to Seattle flight tickets

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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

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

What is the cheapest month to fly to Seattle?

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

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

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 4 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?

No. A direct flight is the cheapest option for a flight between London to Seattle.

How have London to Seattle flight prices changed over time?

As of September 2025, prices for London to Seattle flights are approximately 3% cheaper when compared to flights at the same time last year.

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

American Airlines, Finnair, and Aer Lingus are the most popular carriers operating from London to Seattle/Tacoma Intl

Which airlines fly to Seattle?

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

Reykjavik (KEF) was the most common stop: 77% of momondo users choosing one-stop flights on this route connected there.

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

Flights via Frankfurt am Main (FRA) offer the lowest average return price of £391.

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

Flights connecting via Dublin (DUB) have the shortest average one-way travel time: 12h 55m.

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

Munich (MUC) has the shortest average stopover time for this route: 1h 25m.

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

The number of flights available between London and Seattle is 18 per day as of September 2025. The most frequent departure time is 16:00, with 67% of daily flights leaving in the afternoon.

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

The number of flights available between London and Seattle is 131 per week as of September 2025. The most frequent departure day is Mon, with 16% of weekly flights leaving 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

Best price found

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 many operators does momondo search 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?

What is the most popular airline from London to Seattle?

Best airlines flying from London to Seattle

Compare and see reviews for airlines that fly from London to Seattle with momondo

Delta Flights From London to Seattle

KLM Flights 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.