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Cheap flights from Seattle to London Heathrow Airport from $244

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 Heathrow Airport departing on 7/21. 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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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.
Scandinavian Airlines Logo
4:20 pm - 9:20 amSEA-LHR
33h 00m1 stop
Scandinavian Airlines Logo
6:40 am - 2:00 pmLHR-SEA
15h 20m1 stop
$497Scandinavian Airlines
Find Deal
Fri, Oct 3 - Wed, Oct 15
Scandinavian Airlines Logo
4:20 pm - 5:40 pmSEA-LHR
17h 20m1 stop
Scandinavian Airlines Logo
2:20 pm - 2:00 pmLHR-SEA
31h 40m1 stop
$504Scandinavian Airlines
Find Deal
Sun, Sep 28 - Sat, Oct 11
Scandinavian Airlines Logo
4:00 pm - 9:20 amSEA-LHR
33h 20m1 stop
Scandinavian Airlines Logo
6:40 pm - 1:50 pmLHR-SEA
27h 10m1 stop
$523Scandinavian Airlines
Find Deal
Wed, Aug 20 - Sun, Sep 7
Scandinavian Airlines Logo
4:20 pm - 9:20 amSEA-LHR
33h 00m1 stop
Scandinavian Airlines Logo
6:40 am - 2:00 pmLHR-SEA
15h 20m1 stop
$524Scandinavian Airlines
Find Deal
Wed, Oct 1 - Wed, Oct 15
Virgin Atlantic Logo
5:35 pm - 11:20 amSEA-LHR
9h 45mnonstop
Virgin Atlantic Logo
1:25 pm - 3:45 pmLHR-SEA
10h 20mnonstop
$661Virgin Atlantic
Find Deal
Wed, Oct 1 - Thu, Oct 16
Iberia Logo
1:30 pm - 6:50 amSEA-LHR
9h 20mnonstop
Iberia Logo
4:30 pm - 6:20 pmLHR-SEA
9h 50mnonstop
$675Iberia
Find Deal
Tue, Aug 19 - Wed, Sep 3
Delta Logo
5:35 pm - 11:20 amSEA-LHR
9h 45mnonstop
Delta Logo
6:30 am - 11:50 amLHR-SEA
13h 20m1 stop
$688Delta
Find Deal
Wed, Oct 1 - Wed, Oct 8
Delta Logo
8:25 pm - 2:15 pmSEA-LHR
9h 50mnonstop
Delta Logo
6:30 am - 11:50 amLHR-SEA
13h 20m1 stop
$689Delta
Find Deal
Sun, Sep 14 - Wed, Oct 8
British Airways Logo
8:20 pm - 1:40 pmSEA-LHR
9h 20mnonstop
British Airways Logo
3:00 pm - 4:55 pmLHR-SEA
9h 55mnonstop
$723British Airways
Find Deal
Thu, Oct 9 - Thu, Nov 20
Iberia Logo
1:30 pm - 6:50 amSEA-LHR
9h 20mnonstop
Iberia Logo
9:45 am - 11:30 amLHR-SEA
9h 45mnonstop
$724Iberia
Find Deal
Tue, Aug 26 - Sun, Sep 7

Virgin Atlantic flights from Seattle to London Heathrow Airport

Our best Virgin Atlantic deals on Seattle to London Heathrow Airport flight tickets
Virgin Atlantic
Oct 1
SEA5:35 pmSeattle/Tacoma Intl
9h 45m
LHR11:20 amLondon Heathrow
Oct 16
LHR1:25 pmLondon Heathrow
10h 20m
SEA3:45 pmSeattle/Tacoma Intl
Virgin Atlantic
Apr 27
SEA5:35 pmSeattle/Tacoma Intl
9h 45m
LHR11:20 amLondon Heathrow
May 13
LHR6:15 amLondon Heathrow
13h 00m
1 stop
SEA11:15 amSeattle/Tacoma Intl
Virgin Atlantic
Apr 27
SEA5:35 pmSeattle/Tacoma Intl
9h 45m
LHR11:20 amLondon Heathrow
May 13
LHR1:25 pmLondon Heathrow
10h 20m
SEA3:45 pmSeattle/Tacoma Intl

Icelandair flights from Seattle to London Heathrow Airport

Our best Icelandair deals on Seattle to London Heathrow Airport flight tickets
Icelandair
Sep 26
SEA7:00 pmSeattle/Tacoma Intl
32h 55m
1 stop
LHR11:55 amLondon Heathrow
Oct 6
LHR1:05 pmLondon Heathrow
15h 35m
1 stop
SEA8:40 pmSeattle/Tacoma Intl
Icelandair
Oct 1
SEA3:45 pmSeattle/Tacoma Intl
20h 35m
1 stop
LHR8:20 pmLondon Heathrow
Oct 15
LHR9:25 pmLondon Heathrow
28h 25m
1 stop
SEA5:50 pmSeattle/Tacoma Intl
Icelandair
Sep 19
SEA7:00 pmSeattle/Tacoma Intl
17h 20m
1 stop
LHR8:20 pmLondon Heathrow
Oct 4
LHR1:05 pmLondon Heathrow
12h 45m
1 stop
SEA5:50 pmSeattle/Tacoma Intl

See travel insights to London from

How to get the cheapest flight ticket from Seattle to London Heathrow Airport

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 Heathrow Airport?

What is the cheapest month to fly to London Heathrow Airport?

The month of March is, on average, the cheapest month to fly to London Heathrow Airport from Seattle, with most prices found around $685. If you’re not able to fly to London Heathrow Airport in March, then November is your next best option. Flight prices from Seattle to London Heathrow Airport during November average around $698.

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

Our data shows that Tuesday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $834. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $978.

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

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the afternoon. momondo users have found flights departing from Seattle to London Heathrow Airport in the afternoon for as low as $895. 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 morning are often more expensive with an average ticket price of $987.

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

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

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

You are more likely to see cheaper flights to London Heathrow Airport from Seattle when booking 9 weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around $821 when searching 9 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London Heathrow Airport from Seattle for as low as $782 on momondo.

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

There are 4 cabin classes available to choose from on Seattle/Tacoma Intl to London Heathrow 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 Heathrow Airport flight prices changed over time?

As of April 2025, prices for Seattle to London Heathrow Airport flights are approximately 22% cheaper when compared to flights at the same time last year.

When to book flights from Seattle to London Heathrow Airport

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

Cheap Seattle to London Heathrow Airport (SEA to LHR) flight deals and tips

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

Best Price Found

$244

Fastest flight time

9h 20m

Direct flights

Every day
The best one-way flight to London Heathrow Airport from Seattle in the past 72 hours is $244. The best round-trip flight deal from Seattle to London Heathrow Airport found on momondo in the last 72 hours is $497.
The fastest flight from Seattle to London Heathrow Airport takes 9h 20m
Direct flights go from Seattle to London Heathrow Airport every day.

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

    The straight-line distance from Seattle/Tacoma Intl to London Heathrow is 4774.1 mi. 9h 20m is a normal flight duration for this route.

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

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

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

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

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

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

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


Best airlines flying from Seattle to London Heathrow Airport

Compare and see reviews for airlines that fly from Seattle to London Heathrow Airport with momondo
Airline
Rating
Free Cancellation
Price
LufthansaPriceFrom $378Free CancellationRating
6.7
7,027 reviews
Search Lufthansa flights
IcelandairPriceFrom $504Free CancellationRating
7.0
484 reviews
Search Icelandair flights
United AirlinesPriceFrom $550Free CancellationRating
7.4
8,685 reviews
Search United Airlines flights
IberiaPriceFrom $581Free CancellationRating
7.0
2,684 reviews
Search Iberia flights
Aer LingusPriceFrom $583Free CancellationRating
7.0
1,068 reviews
Search Aer Lingus flights
FinnairPriceFrom $597Free CancellationRating
7.6
1,272 reviews
Search Finnair flights
KLMPriceFrom $598Free CancellationRating
7.8
1,333 reviews
Search KLM flights
Air FrancePriceFrom $615Free CancellationRating
7.4
1,442 reviews
Search Air France flights
DeltaPriceFrom $616Free CancellationRating
8.0
7,920 reviews
Search Delta flights
British AirwaysPriceFrom $621Free CancellationRating
6.6
6,799 reviews
Search British Airways flights
  • Delta Flights From Seattle to London Heathrow Airport

    Delta is one of the most popular airlines flying from Seattle to London Heathrow Airport, operating 14 flights/week on average for this route. A good Delta flight deal for Seattle to London Heathrow Airport starts from $616 round-trip, up to an average price of $873. Our users have rated Delta at 8.0/10.

  • Alaska Airlines Flights From Seattle to London Heathrow Airport

    Another popular option for Seattle to London Heathrow Airport flights is Alaska Airlines (8.0/10, 9,918 ratings). Alaska Airlines flies from Seattle to London Heathrow Airport around 13 times per week, with deals starting from $800 round-trip and rising to an average price of around $1,066.


Traveling to a place near London?

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Why use momondo?

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

Finding the right flight to London from Seattle is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to London quick and easy, saving you time and money.

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

Flights from Seattle to London with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

Once you have performed a search for Seattle to London flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Price alerts on flights to London from Seattle are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.


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