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Cheap flights from Seattle to London from $218

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 2/20. 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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Find the cheapest flights from Seattle to London

Cheap round-trip flights

These are some of the best round-trip flight deals from Seattle to London that have been recently found on momondo from popular airlines, departing in the coming months.

Cheap one-way flights

Flying one-way? These are some of the best deals recently discovered on momondo for flights from Seattle to London.

Cheap last minute flights

Planning a quick getaway from Seattle to London? These are the last-minute flight deals available now.

Cheap direct flights

If you prefer a non-stop journey, check out our latest direct flight deals to London, so you can enjoy a seamless trip without layovers.

Cheap bus & train deals from Seattle to London

Find recent round-trip train or bus tickets from Seattle to London.

All round-trip flight deals to London

The cheapest plane tickets to London found on KAYAK recently.
3:15 pm - 12:50 pmSEA-LHR
13h 35m1 stop
2:50 pm - 2:21 pmLHR-SEA
31h 31m1 stop
$534WestJet
Find Deal
ter, fev 4 - ter, fev 11
3:15 pm - 12:50 pmSEA-LHR
13h 35m1 stop
2:50 pm - 2:21 pmLHR-SEA
31h 31m1 stop
$548WestJet
Find Deal
ter, fev 4 - ter, fev 11
2:35 pm - 10:55 amSEA-LGW
12h 20m1 stop
11:55 am - 5:00 pmLGW-SEA
13h 05m1 stop
$573Icelandair
Find Deal
seg, fev 3 - seg, fev 10
2:35 pm - 10:55 amSEA-LGW
12h 20m1 stop
11:55 am - 6:00 pmLGW-SEA
13h 05m1 stop
$579Icelandair
Find Deal
seg, mar 3 - ter, mar 18
7:50 pm - 12:15 pmSEA-LHR
9h 25mnonstop
3:00 pm - 5:55 pmLHR-SEA
9h 55mnonstop
$661British Airways
Find Deal
qua, mar 12 - qua, mar 26
7:14 am - 7:20 amSEA-LHR
16h 06m1 stop
3:00 pm - 4:55 pmLHR-SEA
9h 55mnonstop
$672British Airways
Find Deal
ter, fev 4 - qui, fev 13
5:45 pm - 11:10 amSEA-LHR
9h 25mnonstop
9:00 am - 11:20 amLHR-SEA
34h 20m1 stop
$700Virgin Atlantic
Find Deal
seg, fev 3 - seg, fev 10
10:55 pm - 6:25 amSEA-LHR
23h 30m1 stop
12:40 pm - 2:40 pmLHR-SEA
10h 00mnonstop
$723Delta
Find Deal
sáb, jan 25 - qui, fev 6
2:09 pm - 4:35 pmSEA-LCY
18h 26m1 stop
5:55 pm - 11:46 amLCY-SEA
25h 51m1 stop
$758Virgin Atlantic
Find Deal
seg, fev 3 - seg, fev 10
5:35 pm - 4:40 pmSEA-LCY
15h 05m1 stop
11:35 am - 4:00 pmLCY-SEA
12h 25m1 stop
$851Delta
Find Deal
dom, abr 6 - seg, abr 21
3:15 pm - 12:50 pmSEA-LHR
13h 35m1 stop
$218WestJet
Find Deal
qui, fev 20
3:15 pm - 12:50 pmSEA-LHR
13h 35m1 stop
$220WestJet
Find Deal
qui, fev 27
2:35 pm - 10:55 amSEA-LGW
12h 20m1 stop
$262Icelandair
Find Deal
seg, jan 20
2:35 pm - 10:50 amSEA-LHR
12h 15m1 stop
$262Icelandair
Find Deal
ter, jan 21
5:45 pm - 11:10 amSEA-LHR
9h 25mnonstop
$402Virgin Atlantic
Find Deal
dom, fev 2
5:45 pm - 11:10 amSEA-LHR
9h 25mnonstop
$404Virgin Atlantic
Find Deal
qua, jan 22
6:50 pm - 12:15 pmSEA-LHR
9h 25mnonstop
$413British Airways
Find Deal
qua, jan 22
7:04 pm - 12:40 pmSEA-LHR
9h 36mnonstop
$418Delta
Find Deal
dom, jan 19
10:55 pm - 8:10 pmSEA-LHR
13h 15m1 stop
$422Delta
Find Deal
sáb, fev 15
6:50 pm - 12:15 pmSEA-LHR
9h 25mnonstop
$441British Airways
Find Deal
seg, jan 20
7:15 pm - 9:20 amSEA-LHR
30h 05m2 stops
6:35 am - 1:20 pmLHR-SEA
14h 45m1 stop
seg, dez 23 - ter, jan 14
7:15 pm - 9:20 amSEA-LHR
30h 05m2 stops
1:50 pm - 1:20 pmLHR-SEA
31h 30m1 stop
seg, dez 23 - seg, fev 24
2:35 pm - 10:50 amSEA-LHR
12h 15m1 stop
8:40 pm - 5:00 pmLHR-SEA
28h 20m1 stop
$1,035Icelandair
Find Deal
seg, dez 23 - seg, fev 24
6:55 pm - 12:40 pmSEA-LHR
9h 45mnonstop
1:05 pm - 3:05 pmLHR-SEA
10h 00mnonstop
$1,071Virgin Atlantic
Find Deal
qua, dez 25 - dom, jan 12
6:10 am - 7:05 amSEA-LHR
16h 55m1 stop
3:50 pm - 6:20 pmLHR-SEA
10h 30mnonstop
$1,074Virgin Atlantic
Find Deal
ter, dez 24 - dom, jan 12
1:35 pm - 8:15 amSEA-LHR
34h 40m1 stop
9:25 am - 11:20 amLHR-SEA
9h 55mnonstop
$1,175British Airways
Find Deal
seg, dez 23 - ter, jan 14
1:35 pm - 8:15 amSEA-LHR
34h 40m1 stop
3:00 pm - 4:55 pmLHR-SEA
9h 55mnonstop
$1,225British Airways
Find Deal
seg, dez 23 - seg, fev 24
7:30 pm - 1:10 pmSEA-LHR
9h 40mnonstop
3:50 pm - 6:20 pmLHR-SEA
10h 30mnonstop
$1,236Delta
Find Deal
sex, dez 27 - qua, jan 8
8:25 am - 7:05 amSEA-LHR
14h 40m1 stop
3:50 pm - 6:20 pmLHR-SEA
10h 30mnonstop
$1,240Delta
Find Deal
qui, dez 26 - qua, jan 8
2:35 pm - 10:55 amSEA-LGW
12h 20m1 stop
11:55 am - 5:00 pmLGW-SEA
13h 05m1 stop
$1,307Icelandair
Find Deal
seg, dez 23 - seg, fev 24
6:50 pm - 12:15 pmSEA-LHR
9h 25mnonstop
9:25 am - 12:20 pmLHR-SEA
9h 55mnonstop
$616Iberia
Find Deal
seg, mar 3 - ter, mar 18
1:30 pm - 6:50 amSEA-LHR
9h 20mnonstop
4:30 pm - 6:20 pmLHR-SEA
9h 50mnonstop
$651British Airways
Find Deal
ter, abr 1 - ter, abr 15
5:45 pm - 11:10 amSEA-LHR
9h 25mnonstop
1:15 pm - 3:15 pmLHR-SEA
10h 00mnonstop
$673Virgin Atlantic
Find Deal
ter, fev 4 - ter, fev 11
1:35 pm - 7:00 amSEA-LHR
9h 25mnonstop
3:00 pm - 4:55 pmLHR-SEA
9h 55mnonstop
$689American Airlines
Find Deal
ter, jan 21 - ter, jan 28
8:20 pm - 1:40 pmSEA-LHR
9h 20mnonstop
4:30 pm - 6:20 pmLHR-SEA
9h 50mnonstop
$691American Airlines
Find Deal
ter, abr 22 - qui, mai 1
5:45 pm - 11:10 amSEA-LHR
9h 25mnonstop
1:15 pm - 3:15 pmLHR-SEA
10h 00mnonstop
$745Virgin Atlantic
Find Deal
seg, fev 3 - seg, fev 10
5:45 pm - 11:10 amSEA-LHR
9h 25mnonstop
12:40 pm - 2:40 pmLHR-SEA
10h 00mnonstop
$769Delta
Find Deal
qui, jan 23 - qui, fev 6
8:25 pm - 1:10 pmSEA-LHR
9h 45mnonstop
3:50 pm - 7:05 pmLHR-SEA
10h 15mnonstop
$770Delta
Find Deal
sex, mar 21 - sex, mar 28
7:04 pm - 12:40 pmSEA-LHR
9h 36mnonstop
3:50 pm - 6:20 pmLHR-SEA
10h 30mnonstop
$876KLM
Find Deal
qua, jan 1 - qua, jan 22
7:05 pm - 12:40 pmSEA-LHR
9h 35mnonstop
1:15 pm - 3:15 pmLHR-SEA
10h 00mnonstop
$1,154KLM
Find Deal
qua, fev 19 - ter, fev 25

Air Canada flights from Seattle to London

Our best Air Canada deals on Seattle to London flight tickets
Air Canada
Feb 4
SEA10:35 amSeattle/Tacoma Intl
14h 45m
2 stops
LHR9:20 amLondon Heathrow
Feb 11
LHR1:00 pmLondon Heathrow
17h 07m
1 stop
SEA10:07 pmSeattle/Tacoma Intl
Air Canada
Jan 19
SEA7:05 pmSeattle/Tacoma Intl
28h 05m
2 stops
LHR7:10 amLondon Heathrow
Feb 4
LHR1:25 pmLondon Heathrow
16h 42m
2 stops
SEA10:07 pmSeattle/Tacoma Intl
Air Canada
Jan 19
SEA7:05 pmSeattle/Tacoma Intl
31h 05m
1 stop
LHR10:10 amLondon Heathrow
Feb 4
LHR1:25 pmLondon Heathrow
16h 42m
2 stops
SEA10:07 pmSeattle/Tacoma Intl

United Airlines flights from Seattle to London

Our best United Airlines deals on Seattle to London flight tickets
United Airlines
May 4
SEA5:45 amSeattle/Tacoma Intl
23h 35m
1 stop
LHR1:20 pmLondon Heathrow
May 15
LHR6:30 amLondon Heathrow
15h 43m
2 stops
SEA2:13 pmSeattle/Tacoma Intl
United Airlines
Feb 4
SEA7:00 amSeattle/Tacoma Intl
20h 05m
2 stops
LHR11:05 amLondon Heathrow
Feb 11
LHR7:40 amLondon Heathrow
13h 40m
1 stop
SEA1:20 pmSeattle/Tacoma Intl
United Airlines
Jan 1
SEA5:00 amSeattle/Tacoma Intl
20h 40m
1 stop
LHR9:40 amLondon Heathrow
Jan 10
LHR6:30 amLondon Heathrow
13h 40m
1 stop
SEA12:10 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 typical price of a round-trip flight between Seattle and London?

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 $667, 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 $677.

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 $768. If your travel schedule is flexible, try to avoid departing on a Thursday because tickets tend to average around $912. 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 $800 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?

Most flyers found that booking tickets 44 days in advance of their planned departure date is the best time to get cheap flights to London. During this timeframe, flight prices are around $832. Don’t hesitate to check prices now though because momondo users recently found tickets for as low as $683.

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.

Can stopping save me money on Seattle to London flights?

You could potentially save up to 45% on your flight if you consider stops on a Seattle to London flight.

How have Seattle to London flight prices changed over time?

As of December 2024, prices for Seattle to London flights are approximately 41% 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

$218

Fastest flight time

9h 20m

Direct flights

Every day

Airports in London

3 airports
The best one-way flight to London from Seattle in the past 72 hours is $218. The best round-trip flight deal from Seattle to London found on momondo in the last 72 hours is $534.
The fastest flight from Seattle to London takes 9h 20m
Direct flights go from Seattle to London every day.
There are 3 airports near London: London Heathrow (LHR), 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 $384Free CancellationRating
6.8
7,083 reviews
Search Lufthansa flights
IcelandairPriceFrom $497Free CancellationRating
7.1
506 reviews
Search Icelandair flights
FinnairPriceFrom $560Free CancellationRating
7.7
1,285 reviews
Search Finnair flights
Aer LingusPriceFrom $581Free CancellationRating
7.1
1,076 reviews
Search Aer Lingus flights
IberiaPriceFrom $583Free CancellationRating
7.0
2,651 reviews
Search Iberia flights
Air FrancePriceFrom $588Free CancellationRating
7.4
1,503 reviews
Search Air France flights
British AirwaysPriceFrom $590Free CancellationRating
6.6
6,810 reviews
Search British Airways flights
KLMPriceFrom $597Free CancellationRating
7.8
1,345 reviews
Search KLM flights
American AirlinesPriceFrom $600Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
DeltaPriceFrom $602Free CancellationRating
8.0
8,594 reviews
Search Delta flights
  • Delta Flights From Seattle to London

    Delta flight deals from Seattle to London start from $602 round-trip. Over the 9 Delta flights for this route in a normal week, average airfare is usually $894 round-trip - but some users have found much cheaper deals with momondo.

  • Alaska Airlines Flights From Seattle to London

    Across 9,549 Alaska Airlines reviews on momondo, the average score is 8.0/10. Alaska Airlines flies from Seattle to London about 9 times each week, with ticket deals ranging from $800 to $1,194. Price data is based on momondo searches in the last 72 hours.


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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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