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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 3/4. 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

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.
6:50 pm - 12:15 pmSEA-LHR
9h 25mnonstop
9:25 am - 12:20 pmLHR-SEA
9h 55mnonstop
$532Iberia
Find Deal
Mon, Mar 3 - Tue, Mar 18
11:48 am - 10:35 amSEA-LGW
15h 47m1 stop
12:00 pm - 8:43 amLGW-SEA
27h 43m1 stop
Tue, Mar 11 - Tue, Mar 18
2:35 pm - 10:50 amSEA-LHR
12h 15m1 stop
8:40 pm - 6:00 pmLHR-SEA
28h 20m1 stop
$542Icelandair
Find Deal
Mon, Mar 3 - Tue, Mar 18
2:35 pm - 7:30 pmSEA-LHR
20h 55m1 stop
8:40 pm - 6:00 pmLHR-SEA
28h 20m1 stop
$562Icelandair
Find Deal
Mon, Mar 3 - Tue, Mar 18
6:45 pm - 11:10 amSEA-LHR
9h 25mnonstop
12:40 pm - 3:40 pmLHR-SEA
10h 00mnonstop
$593Virgin Atlantic
Find Deal
Mon, Mar 17 - Thu, Mar 27
1:59 pm - 11:10 amSEA-LHR
14h 11m1 stop
1:15 pm - 4:15 pmLHR-SEA
10h 00mnonstop
$599Virgin Atlantic
Find Deal
Tue, Mar 11 - Tue, Mar 18
1:30 pm - 10:00 amSEA-LHR
12h 30m1 stop
6:30 am - 12:40 pmLHR-SEA
13h 10m1 stop
$620Delta
Find Deal
Mon, Mar 3 - Tue, Mar 11
5:35 pm - 11:25 amSEA-LHR
9h 50mnonstop
9:00 am - 5:25 pmLHR-SEA
16h 25m1 stop
$623Delta
Find Deal
Wed, Apr 23 - Fri, May 9
10:22 am - 9:00 amSEA-LHR
14h 38m1 stop
10:50 am - 11:09 pmLHR-SEA
20h 19m2 stops
$625British Airways
Find Deal
Mon, Apr 21 - Tue, Apr 29
6:50 pm - 12:15 pmSEA-LHR
9h 25mnonstop
3:00 pm - 5:55 pmLHR-SEA
9h 55mnonstop
$656British Airways
Find Deal
Mon, Mar 3 - Tue, Mar 11

Aer Lingus flights from Seattle to London

Our best Aer Lingus deals on Seattle to London flight tickets
Aer Lingus
Mar 19
SEA9:00 pmSeattle/Tacoma Intl
17h 05m
1 stop
LHR9:05 pmLondon Heathrow
Mar 26
LHR7:50 amLondon Heathrow
18h 25m
1 stop
SEA7:15 pmSeattle/Tacoma Intl
Aer Lingus
Mar 19
SEA9:00 pmSeattle/Tacoma Intl
13h 50m
1 stop
LHR5:50 pmLondon Heathrow
Mar 26
LHR9:50 amLondon Heathrow
16h 25m
1 stop
SEA7:15 pmSeattle/Tacoma Intl
Aer Lingus
Mar 19
SEA9:00 pmSeattle/Tacoma Intl
11h 35m
1 stop
LHR3:35 pmLondon Heathrow
Mar 26
LHR8:50 amLondon Heathrow
17h 25m
1 stop
SEA7:15 pmSeattle/Tacoma Intl

Virgin Atlantic flights from Seattle to London

Our best Virgin Atlantic deals on Seattle to London flight tickets
Virgin Atlantic
Mar 17
SEA6:45 pmSeattle/Tacoma Intl
9h 25m
LHR11:10 amLondon Heathrow
Mar 27
LHR12:40 pmLondon Heathrow
10h 00m
SEA3:40 pmSeattle/Tacoma Intl
Virgin Atlantic
Mar 11
SEA1:59 pmSeattle/Tacoma Intl
14h 11m
1 stop
LHR11:10 amLondon Heathrow
Mar 18
LHR1:15 pmLondon Heathrow
10h 00m
SEA4:15 pmSeattle/Tacoma Intl
Virgin Atlantic
Mar 19
SEA6:45 pmSeattle/Tacoma Intl
9h 25m
LHR11:10 amLondon Heathrow
Mar 26
LHR1:15 pmLondon Heathrow
10h 00m
SEA4:15 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 January. Flight prices, which tend to average around $669, are often lower during this time because this is during the off-season. The month of October is another great option to travel to London, with average flight prices from Seattle averaging around $670.

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 $837. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $994. 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 $899 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 $840 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 $770 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 February 2025, prices for Seattle to London flights are approximately 21% 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 $532.
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
6.7
7,006 reviews
Search Lufthansa flights
IcelandairPriceFrom $504Free CancellationRating
7.0
493 reviews
Search Icelandair flights
IberiaPriceFrom $583Free CancellationRating
7.0
2,638 reviews
Search Iberia flights
Aer LingusPriceFrom $583Free CancellationRating
7.1
1,075 reviews
Search Aer Lingus flights
FinnairPriceFrom $586Free CancellationRating
7.6
1,279 reviews
Search Finnair flights
Air FrancePriceFrom $592Free CancellationRating
7.4
1,462 reviews
Search Air France flights
KLMPriceFrom $597Free CancellationRating
7.8
1,334 reviews
Search KLM flights
United AirlinesPriceFrom $611Free CancellationRating
7.4
8,831 reviews
Search United Airlines flights
DeltaPriceFrom $612Free CancellationRating
8.0
8,315 reviews
Search Delta flights
Virgin AtlanticPriceFrom $614Free CancellationRating
7.5
659 reviews
Search Virgin Atlantic flights
  • Delta Flights From Seattle to London

    Delta flight deals from Seattle to London start from $612 round-trip. Over the 7 Delta flights for this route in a normal week, average airfare is usually $886 round-trip - but some users have found much cheaper deals with momondo.

  • Alaska Airlines Flights From Seattle to London

    Across 9,694 Alaska Airlines reviews on momondo, the average score is 8.0/10. Alaska Airlines flies from Seattle to London about 6 times each week, with ticket deals ranging from $800 to $1,066. 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
Gatwick
Hounslow
Croydon
Luton
Slough
Guildford
Ipswich
Hayes
Stansted
Ilford
Canterbury
Dover
Milton Keynes
Dartford
Horley
Colchester
Wembley
Eastbourne
Chelmsford
Southend-on-Sea

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 2/18
Tue 2/25

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