Cheap flights from Seattle to London Heathrow Airport from $275

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Flight information for Seattle to London Heathrow Airport
(SEA to LHR)

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

Best Price Found

$275

Fastest flight time

8h 15m

Direct flights

Every day
The best one-way flight to London Heathrow Airport from Seattle in the past 72 hours is $275. The best round-trip flight deal from Seattle to London Heathrow Airport found on momondo in the last 72 hours is $523.
The fastest flight from Seattle to London Heathrow Airport takes 8h 15m
Direct flights go from Seattle to London Heathrow Airport every day.

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 cheapest month to fly from Seattle to London Heathrow Airport?

February. The cheapest time of year to fly to London Heathrow Airport from Seattle is February. Most expensive is June

What is the cheapest airline that flies to London Heathrow Airport from Seattle?

Icelandair. Aer Lingus, Air Canada, and Finnair are the most popular carriers operating from Seattle to London Heathrow Airport

How far in advance should you book Seattle to London Heathrow Airport flights?

50 days before. The cheapest time to buy a flight from Seattle to London Heathrow Airport is approximately 50 days to departure

How many flights depart from Seattle to London Heathrow Airport on average per day?

As of September 2023, 19 flights take off from Seattle and land in London Heathrow Airport each day. The most common flight departure time for this route is 6:00PM, with 52% of daily flights taking off in the evening.

How many flights depart from Seattle to London Heathrow Airport on average per week?

135 flights are operational weekly from Seattle to London Heathrow Airport as of September 2023. The most popular departure day for this route is Sunday, with 15% of flights per week taking off on this day.

What cabin class options are available on Seattle to London Heathrow Airport flights?

There are 2 cabin classes available to choose from on Seattle to London Heathrow Airport flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

If you are looking to fly from Seattle to London, you are most likely going to fly from Seattle/Tacoma Intl Airport to London Heathrow Airport, the most popular airports on that route. The least expensive flight option from Seattle to London will typically be SEA ā€” LHR during the month of September with an average price of $493 RT.

Seattle/Tacoma Intl Airport (SEA) to London Heathrow Airport (LHR)$493
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Easily compare round-trip flights from Seattle to London Heathrow Airport

Below you can see the best fares for your round-trip flight route over the next six months. All fares were found on momondo this week. Browse the quickest and cheapest flights from Seattle to London Heathrow Airport by changing tabs
Lufthansa
Nov 18
SEA10:20 amSeattle/Tacoma Intl
12h 30m
1 stop
LHR3:50 amLondon Heathrow
Nov 26
LHR2:30 pmLondon Heathrow
24h 30m
1 stop
SEA3:00 pmSeattle/Tacoma Intl
Aer Lingus
Dec 2
SEA3:05 pmSeattle/Tacoma Intl
12h 45m
1 stop
LHR8:50 amLondon Heathrow
Dec 13
LHR7:15 amLondon Heathrow
14h 00m
1 stop
SEA9:15 pmSeattle/Tacoma Intl
Icelandair
Nov 7
SEA9:35 amSeattle/Tacoma Intl
20h 55m
1 stop
LHR11:30 amLondon Heathrow
Nov 14
LHR3:40 pmLondon Heathrow
28h 20m
1 stop
SEA8:00 pmSeattle/Tacoma Intl
Virgin Atlantic
Nov 7
SEA5:00 amSeattle/Tacoma Intl
16h 35m
1 stop
LHR2:35 amLondon Heathrow
Nov 14
LHR7:25 amLondon Heathrow
9h 55m
SEA5:20 pmSeattle/Tacoma Intl
Iberia
Jan 10
SEA1:45 pmSeattle/Tacoma Intl
9h 20m
LHR4:05 amLondon Heathrow
Jan 17
LHR9:50 amLondon Heathrow
9h 55m
SEA7:45 pmSeattle/Tacoma Intl
Delta
Feb 4
SEA1:05 pmSeattle/Tacoma Intl
9h 35m
LHR3:40 amLondon Heathrow
Feb 22
LHR1:30 amLondon Heathrow
13h 35m
1 stop
SEA3:05 pmSeattle/Tacoma Intl

Find the cheapest one-way flights from Seattle to London Heathrow Airport

If you're looking for one-way flights from Seattle to London Heathrow Airport, view some of our deals below provided by Aer Lingus, Icelandair and Lufthansa
Multiple Airlines
Nov 14
SEA12:30 amSeattle/Tacoma Intl
32h 05m
3 stops
LHR1:35 pmLondon Heathrow
Lufthansa
Oct 18
SEA11:00 amSeattle/Tacoma Intl
14h 20m
1 stop
LHR6:20 amLondon Heathrow
Aer Lingus
Dec 27
SEA3:05 pmSeattle/Tacoma Intl
12h 45m
1 stop
LHR8:50 amLondon Heathrow

Search last-minute flights to London Heathrow Airport from Seattle

Find and compare round-trip flight prices for your last-minute flight from Seattle to London Heathrow Airport
Aer Lingus
Oct 1
SEA2:50 pmSeattle/Tacoma Intl
14h 30m
1 stop
LHR10:20 amLondon Heathrow
Oct 31
LHR2:45 pmLondon Heathrow
31h 30m
1 stop
SEA10:15 pmSeattle/Tacoma Intl
Turkish Airlines
Oct 4
SEA1:50 pmSeattle/Tacoma Intl
20h 35m
1 stop
LHR3:25 pmLondon Heathrow
Oct 12
LHR6:10 pmLondon Heathrow
26h 10m
1 stop
SEA8:20 pmSeattle/Tacoma Intl
JetBlue
Oct 2
SEA7:22 pmSeattle/Tacoma Intl
13h 23m
1 stop
LHR1:45 pmLondon Heathrow
Oct 6
LHR7:55 amLondon Heathrow
18h 17m
1 stop
SEA2:12 amSeattle/Tacoma Intl
Multiple Airlines
Oct 3
SEA4:50 pmSeattle/Tacoma Intl
31h 15m
3 stops
LHR5:05 amLondon Heathrow
Oct 10
LHR10:10 amLondon Heathrow
10h 07m
SEA8:17 pmSeattle/Tacoma Intl
Lufthansa
Oct 4
SEA5:50 amSeattle/Tacoma Intl
18h 00m
2 stops
LHR4:50 amLondon Heathrow
Oct 11
LHR2:30 amLondon Heathrow
15h 48m
2 stops
SEA6:18 pmSeattle/Tacoma Intl
Delta
Oct 4
SEA3:35 pmSeattle/Tacoma Intl
9h 40m
LHR6:15 amLondon Heathrow
Oct 11
LHR4:40 amLondon Heathrow
15h 25m
1 stop
SEA8:05 pmSeattle/Tacoma Intl

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 $402Free CancellationRating
6.7
1,054 reviews
Search Lufthansa flights
IcelandairPriceFrom $493Free CancellationRating
7.5
119 reviews
Search Icelandair flights
Aer LingusPriceFrom $525Free CancellationRating
7.1
391 reviews
Search Aer Lingus flights
FinnairPriceFrom $578Free CancellationRating
7.7
368 reviews
Search Finnair flights
IberiaPriceFrom $623Free CancellationRating
6.9
555 reviews
Search Iberia flights
DeltaPriceFrom $624Free CancellationRating
7.8
1,565 reviews
Search Delta flights
American AirlinesPriceFrom $640Free CancellationRating
7.1
2,890 reviews
Search American Airlines flights
Virgin AtlanticPriceFrom $647Free CancellationRating
7.6
329 reviews
Search Virgin Atlantic flights
British AirwaysPriceFrom $654Free CancellationRating
6.4
2,315 reviews
Search British Airways flights
Alaska AirlinesPriceFrom $656Free CancellationRating
7.9
3,001 reviews
Search Alaska Airlines flights
  • Alaska Airlines Flights From Seattle to London Heathrow Airport

    Alaska Airlines is one of the most popular airlines flying from Seattle to London Heathrow Airport, operating 7 flights/week on average for this route. A good Alaska Airlines flight deal for Seattle to London Heathrow Airport starts from $656 round-trip, up to an average price of $1,005. Our users have rated Alaska Airlines at 7.9/10.

  • Delta Flights From Seattle to London Heathrow Airport

    Another popular option for Seattle to London Heathrow Airport flights is Delta (7.8/10, 1,565 ratings). Delta flies from Seattle to London Heathrow Airport around 14 times per week, with deals starting from $624 round-trip and rising to an average price of around $1,056.


Icelandair flights from Seattle to London Heathrow Airport

Our best Icelandair deals on Seattle to London Heathrow Airport flight tickets
Icelandair
Nov 7
SEA9:35 amSeattle/Tacoma Intl
20h 55m
1 stop
LHR11:30 amLondon Heathrow
Nov 14
LHR3:40 pmLondon Heathrow
28h 20m
1 stop
SEA8:00 pmSeattle/Tacoma Intl
Icelandair
Oct 16
SEA11:50 amSeattle/Tacoma Intl
12h 05m
1 stop
LHR4:55 amLondon Heathrow
Nov 20
LHR7:15 amLondon Heathrow
12h 45m
1 stop
SEA8:00 pmSeattle/Tacoma Intl
Icelandair
Oct 16
SEA11:50 amSeattle/Tacoma Intl
20h 30m
1 stop
LHR1:20 pmLondon Heathrow
Nov 15
LHR3:40 pmLondon Heathrow
28h 20m
1 stop
SEA8:00 pmSeattle/Tacoma Intl

Virgin Atlantic flights from Seattle to London Heathrow Airport

Our best Virgin Atlantic deals on Seattle to London Heathrow Airport flight tickets
Virgin Atlantic
Nov 7
SEA5:00 amSeattle/Tacoma Intl
16h 35m
1 stop
LHR2:35 amLondon Heathrow
Nov 14
LHR7:25 amLondon Heathrow
9h 55m
SEA5:20 pmSeattle/Tacoma Intl
Virgin Atlantic
Oct 25
SEA3:35 pmSeattle/Tacoma Intl
9h 40m
LHR6:15 amLondon Heathrow
Dec 4
LHR6:30 amLondon Heathrow
33h 05m
1 stop
SEA3:35 pmSeattle/Tacoma Intl
Virgin Atlantic
Oct 25
SEA7:50 amSeattle/Tacoma Intl
14h 10m
1 stop
LHR3:00 amLondon Heathrow
Dec 4
LHR9:45 amLondon Heathrow
29h 50m
1 stop
SEA3:35 pmSeattle/Tacoma Intl

  • 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 15m 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.


Alternative routes for Seattle to London Heathrow Airport

Compare alternative flights to and from nearby airports and cities to discover the best prices and most convenient flight times
Seattle to London Gatwick Airport Flights
Fastest flight time12h 20m
Cheapest price$504
Seattle to London City Airport Flights
Fastest flight time13h 25m
Cheapest price$660
Seattle to London Stansted Airport Flights
Fastest flight time12h 10m
Cheapest price$604
Seattle to London Luton Airport Flights
Fastest flight time12h 50m
Cheapest price$622
Seattle to London Southend Airport Flights
Fastest flight time31h 10m
Cheapest price$1,892

Similar Seattle to London Heathrow Airport flights

Flexible with your destination? Broaden your search and find flights similar to your Seattle to London Heathrow Airport route

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.

Iā€™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.


An easier way to manage your London Heathrow Airport trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free ā€” and available to use no matter where you book.