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Cheap flights from Seattle to London from $195

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to London departing on 7/6. 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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Find the cheapest flights from Seattle to London

Cheap round-trip flights

KAYAK's recommended round-trip deals from the most popular airlines that fly from Seattle to London.
7:00 pm - 11:55 amSEA-LHR
32h 55m1 stop
9:25 pm - 11:25 amLHR-SEA
22h 00m1 stop
$525Icelandair
Find Deal
Tue, May 20 - Tue, May 27
7:00 pm - 2:35 pmSEA-LGW
11h 35m1 stop
8:55 pm - 8:28 pmLGW-SEA
31h 33m2 stops
Mon, May 19 - Wed, Jun 18
1:30 pm - 6:50 amSEA-LHR
9h 20mnonstop
9:50 am - 11:35 amLHR-SEA
9h 45mnonstop
$632Iberia
Find Deal
Sun, Apr 13 - Wed, Apr 30
11:54 am - 10:50 amSEA-LHR
14h 56m1 stop
2:25 pm - 11:09 pmLHR-SEA
16h 44m1 stop
$646Iberia
Find Deal
Sun, Apr 13 - Wed, Apr 30
5:35 pm - 11:20 amSEA-LHR
9h 45mnonstop
1:25 pm - 3:45 pmLHR-SEA
10h 20mnonstop
$658Virgin Atlantic
Find Deal
Sun, Apr 27 - Tue, May 13
5:35 pm - 11:20 amSEA-LHR
9h 45mnonstop
1:25 pm - 3:45 pmLHR-SEA
10h 20mnonstop
$675Virgin Atlantic
Find Deal
Sun, Apr 27 - Tue, May 13
8:20 pm - 1:40 pmSEA-LHR
9h 20mnonstop
9:25 am - 11:10 amLHR-SEA
9h 45mnonstop
$677British Airways
Find Deal
Tue, Apr 29 - Tue, May 13
9:25 am - 1:30 pmSEA-LHR
20h 05m1 stop
11:45 am - 11:40 amLHR-SEA
31h 55m1 stop
$688Delta
Find Deal
Sun, Apr 27 - Tue, May 6
8:20 pm - 2:15 pmSEA-LHR
9h 55mnonstop
6:15 am - 5:25 pmLHR-SEA
19h 10m1 stop
$689Delta
Find Deal
Sun, Apr 27 - Tue, May 6
8:20 pm - 1:40 pmSEA-LHR
9h 20mnonstop
9:50 am - 11:35 amLHR-SEA
9h 45mnonstop
$725British Airways
Find Deal
Tue, Apr 29 - Mon, May 12

Icelandair flights from Seattle to London

Our best Icelandair deals on Seattle to London flight tickets
Icelandair
May 20
SEA7:00 pmSeattle/Tacoma Intl
32h 55m
1 stop
LHR11:55 amLondon Heathrow
May 27
LHR9:25 pmLondon Heathrow
22h 00m
1 stop
SEA11:25 amSeattle/Tacoma Intl
Icelandair
May 11
SEA7:00 pmSeattle/Tacoma Intl
32h 45m
1 stop
LGW11:45 amLondon Gatwick
May 27
LGW3:40 pmLondon Gatwick
27h 45m
1 stop
SEA11:25 amSeattle/Tacoma Intl
Icelandair
May 11
SEA7:00 pmSeattle/Tacoma Intl
32h 55m
1 stop
LHR11:55 amLondon Heathrow
May 27
LHR9:25 pmLondon Heathrow
22h 00m
1 stop
SEA11:25 amSeattle/Tacoma Intl

Scandinavian Airlines flights from Seattle to London

Our best Scandinavian Airlines deals on Seattle to London flight tickets
Scandinavian Airlines
Jun 2
SEA4:00 pmSeattle/Tacoma Intl
21h 40m
1 stop
LHR9:40 pmLondon Heathrow
Jun 16
LHR7:05 amLondon Heathrow
14h 45m
2 stops
SEA1:50 pmSeattle/Tacoma Intl
Scandinavian Airlines
May 26
SEA4:00 pmSeattle/Tacoma Intl
16h 00m
1 stop
LHR4:00 pmLondon Heathrow
Jun 29
LHR6:40 pmLondon Heathrow
27h 10m
1 stop
SEA1:50 pmSeattle/Tacoma Intl
Scandinavian Airlines
Sep 21
SEA4:20 pmSeattle/Tacoma Intl
21h 20m
1 stop
LHR9:40 pmLondon Heathrow
Oct 1
LHR6:40 amLondon Heathrow
15h 20m
1 stop
SEA2:00 pmSeattle/Tacoma Intl

See travel insights to London from

How to get the cheapest flight ticket from Seattle to London

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 London?

The cheapest month to fly to London from Seattle is in October. Flight prices, which tend to average around $668, are often lower during this time because this is during the off-season. The month of January is another great option to travel to London, with average flight prices from Seattle averaging around $669.

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

The cheapest day to depart from Seattle to London is on a Tuesday. Travelers who choose to depart for London on a Tuesday will often find tickets for as low as $840. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $983. These prices are subject to change though, so be sure to set up a Price Alert for flights to London.

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

Flying to London from Seattle in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $897 when looking at flights departing in the afternoon. Flights to London are more costly in the morning, with an average ticket price of $980. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest Seattle/Tacoma Intl to London flight route?

Fly from Seattle/Tacoma Intl to London Heathrow for the best Seattle/Tacoma Intl - London flight prices

How far in advance should I book a flight to London?

You are more likely to see cheaper flights to London from Seattle when booking 6 weeks ahead of your departure date. In general, you can expect to find flights to London for around $830 when searching 6 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London from Seattle for as low as $741 on momondo.

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

There are 4 cabin classes available to choose from on Seattle/Tacoma Intl to London flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

How have Seattle to London flight prices changed over time?

As of March 2025, prices for Seattle to London flights are approximately 26% cheaper when compared to flights at the same time last year.

When to book flights from Seattle to London

Are you open to changing your travel dates? Check out the ideal times to fly from Seattle to London according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Seattle to London (SEA to LON) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to London

Best Price Found

$195

Fastest flight time

9h 20m

Direct flights

Every day

Airports in London

4 airports
The best one-way flight to London from Seattle in the past 72 hours is $195. The best round-trip flight deal from Seattle to London found on momondo in the last 72 hours is $525.
The fastest flight from Seattle to London takes 9h 20m
Direct flights go from Seattle to London every day.
There are 4 airports near London: London Heathrow (LHR), London Luton (LTN), London Stansted (STN), London Gatwick (LGW)

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

    London is 4781.3 mi away from Seattle/Tacoma Intl. By plane, this route typically takes 9h 20m.

  • When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to London?

    Prices for flights from Seattle/Tacoma Intl Airport to London are refreshed on a daily basis.

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

  • How old do you have to be to fly from Seattle/Tacoma Intl Airport to London?

    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 Seattle/Tacoma Intl Airport to London.

  • What documentation or ID do you need to fly to London?

    The travel and health documents you'll need for your trip to London 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 London. 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 Seattle to London?

  • What is the most popular airline from Seattle to London?


Best airlines flying from Seattle to London

Compare and see reviews for airlines that fly from Seattle to London with momondo
Airline
Rating
Free Cancellation
Price
LufthansaPriceFrom $378Free CancellationRating
6.7
6,955 reviews
Search Lufthansa flights
United AirlinesPriceFrom $498Free CancellationRating
7.4
8,603 reviews
Search United Airlines flights
IcelandairPriceFrom $509Free CancellationRating
7.0
476 reviews
Search Icelandair flights
IberiaPriceFrom $582Free CancellationRating
7.0
2,651 reviews
Search Iberia flights
Aer LingusPriceFrom $583Free CancellationRating
7.0
1,062 reviews
Search Aer Lingus flights
FinnairPriceFrom $597Free CancellationRating
7.6
1,267 reviews
Search Finnair flights
KLMPriceFrom $597Free CancellationRating
7.8
1,321 reviews
Search KLM flights
Air FrancePriceFrom $608Free CancellationRating
7.4
1,424 reviews
Search Air France flights
DeltaPriceFrom $614Free CancellationRating
8.0
7,895 reviews
Search Delta flights
American AirlinesPriceFrom $618Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
  • Delta Flights From Seattle to London

    Delta flight deals from Seattle to London start from $614 round-trip. Over the 3 Delta flights for this route in a normal week, average airfare is usually $873 round-trip - but some users have found much cheaper deals with momondo.

  • Alaska Airlines Flights From Seattle to London

    Across 9,798 Alaska Airlines reviews on momondo, the average score is 8.0/10. Alaska Airlines flies from Seattle to London about 3 times each week, with ticket deals ranging from $800 to $1,082. Price data is based on momondo searches in the last 72 hours.


Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Hounslow
Gatwick
Croydon
Luton
Guildford
Slough
Hayes
Dartford
Stansted
Ilford
Dover
Canterbury
Colchester
Milton Keynes
Horley
Wembley
Chelmsford
Eastbourne
Southend-on-Sea
Hook

Why use momondo?

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

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

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

Yes. All flights to London from Seattle on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Seattle to London.

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

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


An easier way to manage your London trip

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1 adult
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Tue 4/8

Find better results for your trip to the United Kingdom

Fly into one of these airports located in London

Airports listed have a maximum distance of 35.6 mi from London