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Cheap flights from London to Seattle from $297

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 9/2. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Cheap round-trip flights

Austrian Airlines Logo
12:05 pm - 8:54 pmLHR-SEA
15h 49m1 stop
Austrian Airlines Logo
8:00 am - 6:40 amSEA-LHR
14h 40m1 stop
$318Austrian Airlines
Find Deal
Tue, Oct 28 - Tue, Nov 4
 Logo
6:00 am - 2:50 pmLHR-SEA
16h 50m1 stop
 Logo
1:00 pm - 10:40 amSEA-LHR
13h 40m1 stop
Sat, Jun 28 - Tue, Jul 15
Virgin Atlantic Logo
6:15 am - 11:15 amLHR-SEA
13h 00m1 stop
Virgin Atlantic Logo
5:35 pm - 11:20 amSEA-LHR
9h 45mnonstop
$596Virgin Atlantic
Find Deal
Tue, Sep 23 - Tue, Oct 7
British Airways Logo
11:55 am - 9:19 pmLHR-SEA
16h 24m1 stop
British Airways Logo
11:51 am - 10:00 amSEA-LHR
14h 09m1 stop
$603British Airways
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Tue, Oct 28 - Tue, Nov 4
Virgin Atlantic Logo
1:25 pm - 3:45 pmLHR-SEA
10h 20mnonstop
Virgin Atlantic Logo
5:35 pm - 11:20 amSEA-LHR
9h 45mnonstop
$610Virgin Atlantic
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Wed, Sep 3 - Wed, Sep 17
Icelandair Logo
3:40 pm - 8:40 pmLGW-SEA
13h 00m1 stop
Icelandair Logo
7:00 pm - 2:40 pmSEA-LGW
11h 40m1 stop
$611Icelandair
Find Deal
Tue, Sep 9 - Wed, Sep 17
Delta Logo
9:55 am - 4:05 pmLHR-SEA
14h 10m1 stop
Delta Logo
11:15 am - 10:15 amSEA-LHR
15h 00m1 stop
$622Delta
Find Deal
Wed, Sep 10 - Mon, Sep 15
Icelandair Logo
3:40 pm - 8:40 pmLGW-SEA
13h 00m1 stop
Icelandair Logo
7:00 pm - 2:40 pmSEA-LGW
11h 40m1 stop
$622Icelandair
Find Deal
Wed, Aug 27 - Tue, Sep 9
Delta Logo
6:30 am - 4:05 pmLHR-SEA
17h 35m1 stop
Delta Logo
7:20 am - 6:45 amSEA-LHR
15h 25m1 stop
$623Delta
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Wed, Sep 10 - Mon, Sep 15
British Airways Logo
4:30 pm - 6:20 pmLHR-SEA
9h 50mnonstop
British Airways Logo
1:30 pm - 6:50 amSEA-LHR
9h 20mnonstop
$648British Airways
Find Deal
Thu, Aug 28 - Tue, Sep 9

WestJet flights from London to Seattle

Our best WestJet deals on London to Seattle flight tickets
WestJet
Oct 2
LGW10:45 amLondon Gatwick
33h 48m
2 stops
SEA12:33 pmSeattle/Tacoma Intl
Oct 11
SEA7:05 amSeattle/Tacoma Intl
42h 20m
2 stops
LGW9:25 amLondon Gatwick
WestJet
Jun 25
LGW10:45 amLondon Gatwick
34h 13m
2 stops
SEA12:58 pmSeattle/Tacoma Intl
Jul 2
SEA7:35 pmSeattle/Tacoma Intl
53h 50m
2 stops
LGW9:25 amLondon Gatwick

Scandinavian Airlines flights from London to Seattle

Our best Scandinavian Airlines deals on London to Seattle flight tickets
Scandinavian Airlines
Aug 30
LHR6:40 amLondon Heathrow
15h 10m
1 stop
SEA1:50 pmSeattle/Tacoma Intl
Sep 8
SEA4:00 pmSeattle/Tacoma Intl
16h 00m
1 stop
LHR4:00 pmLondon Heathrow
Scandinavian Airlines
Aug 30
LHR3:35 pmLondon Heathrow
30h 15m
2 stops
SEA1:50 pmSeattle/Tacoma Intl
Sep 8
SEA4:00 pmSeattle/Tacoma Intl
18h 30m
1 stop
LHR6:30 pmLondon Heathrow
Scandinavian Airlines
Sep 4
LHR10:20 amLondon Heathrow
35h 30m
1 stop
SEA1:50 pmSeattle/Tacoma Intl
Sep 21
SEA4:20 pmSeattle/Tacoma Intl
21h 20m
1 stop
LHR9:40 pmLondon Heathrow

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

What is the cheapest month to fly to Seattle?

In general, January is the cheapest month to fly from London to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $623. If you don’t want to visit Seattle in January, then you should wait until March to fly from London, when ticket prices are also cheap, with an average price of $657.

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

On average, the least expensive day to fly to Seattle from London is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as $792. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Friday is the most expensive day to depart from London because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $1,189.

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

Flying to Seattle from London at noon is the least expensive time of day to depart. momondo users have found prices as low as $843 when looking at flights departing at noon. Flights to Seattle are more costly in the morning, with an average ticket price of $949. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

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 24 weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $782 when searching 24 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from London for as low as $699 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.

How have London to Seattle flight prices changed over time?

As of June 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 round-trip 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

$297

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 $297. The best round-trip flight deal from London to Seattle found on momondo in the last 72 hours is $318.
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)

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

    The straight-line distance from London to Seattle/Tacoma Intl is 4781.3 mi. 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 are refreshed on a daily basis.

  • 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?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to 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?

  • 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
Airline
Rating
Free Cancellation
Price
IcelandairPriceFrom $402Free CancellationRating
7.0
499 reviews
Search Icelandair flights
British AirwaysPriceFrom $560Free CancellationRating
6.6
7,008 reviews
Search British Airways flights
IberiaPriceFrom $575Free CancellationRating
7.0
2,776 reviews
Search Iberia flights
Virgin AtlanticPriceFrom $594Free CancellationRating
7.4
652 reviews
Search Virgin Atlantic flights
American AirlinesPriceFrom $620Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
DeltaPriceFrom $632Free CancellationRating
8.0
7,946 reviews
Search Delta flights
  • Delta Flights From London to Seattle

    Across 12 Delta flights from London to Seattle this week, the average price was $887, with the best Delta deals starting from $632 round-trip. 7,950 users have rated Delta on momondo, with an average score of 8.0/10.

  • Virgin Atlantic Flights From London to Seattle

    Virgin Atlantic is also a popular choice for this route. Virgin Atlantic flight deals for London to Seattle start from as low as $594 round-trip, depending on your selected dates, with average Virgin Atlantic deals seen on momondo around $941. Virgin Atlantic operates 12 flights to Seattle from London in an average week. Users have rated it 7.4/10 across 652 reviews.


Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Leavenworth
Tacoma
SeaTac
Ocean Shores
Olympia
Renton
Kent
Federal Way
Tukwila
Puyallup
Kirkland
Lynnwood
Marysville
Lakewood
Fife
Shoreline
Cle Elum
Centralia
Redmond
Westport

Why use momondo?

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?

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 simply researching potential flights to Seattle, momondo offers a useful price alert feature which will track prices for flights to Seattle from London and alert you when they change.


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1 adult
Tue 6/17
Tue 6/24

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