What day of the week experiences the fewest flight delays on this route?

Friday is statistically the day of the week that experiences the fewest delays on this flight route. Sunday has historically seen more delays on average compared to the rest of the week.

What is the most punctual flight time for Seattle to London flights?

Generally, flights departing in the early afternoon tend to experience fewer delays. Flights departing in the evening have, in the past, seen delays more frequently in comparison.

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

As of October 2025, there are 10 flights per day flying from Seattle to London Heathrow Airport. The most common time of day flights depart is 5:00p.m., with 56% of flights taking off in the afternoon.

How often are flights from Seattle to London delayed?

Historically, on average around 17% of flights between Seattle and London have experienced a delay on any given week. The average delay length over the past 12 months has been 131 minutes.

What is the cheapest airline that flies from Seattle/Tacoma Intl to London Heathrow?

WestJet, United Airlines, and Air Canada are the most popular carriers operating from Seattle/Tacoma Intl to London Heathrow

Which airline has the best punctuality record on Seattle to London flights?

According to our data, La Costena has had the lowest number of delays on this route over the last 12 months, with no flights being classified as delayed.

Which airlines fly to London Heathrow Airport?

Virgin Atlantic, British Airways and Iberia are the top three most popular airlines that fly to London Heathrow Airport from Seattle according to our data. Virgin Atlantic is the first choice among our users, with 46% of people opting to fly with this airline when travelling to London Heathrow Airport. Keep in mind that there are 4 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.

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

The number of flights available between Seattle and London Heathrow Airport is 76 per week as of October 2025. The most frequent departure day is Tue, with 20% of weekly flights leaving on this day.

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 updated daily.

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

As of October 2025, there are 4 operators available to choose from 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?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify 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.

C$ 514 Cheap Flights from Seattle to London Heathrow Airport in 2025/26

1 adult

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2:35 p.m. - 7:30 p.m.SEA-LHR

20h 55m1 stop

12:15 p.m. - 5:00 p.m.LHR-SEA

12h 45m1 stop

C$ 727Icelandair

Find Deal

Tue, 2 Dec - Fri, 23 Jan

2:35 p.m. - 10:50 a.m.SEA-LHR

12h 15m1 stop

8:35 p.m. - 5:00 p.m.LHR-SEA

28h 25m1 stop

C$ 728Icelandair

Find Deal

Tue, 11 Nov - Mon, 17 Nov

2:35 p.m. - 10:50 a.m.SEA-LHR

12h 15m1 stop

8:35 p.m. - 5:00 p.m.LHR-SEA

28h 25m1 stop

C$ 729Icelandair

Find Deal

Mon, 24 Nov - Sat, 6 Dec

3:35 p.m. - 10:50 a.m.SEA-LHR

12h 15m1 stop

9:25 p.m. - 8:45 p.m.LHR-SEA

31h 20m1 stop

C$ 732Icelandair

Find Deal

Fri, 13 Mar - Sun, 29 Mar

8:05 p.m. - 3:35 p.m.SEA-LHR

11h 30m1 stop

12:10 p.m. - 6:20 p.m.LHR-SEA

14h 10m1 stop

C$ 780Aer Lingus

Find Deal

Mon, 24 Nov - Fri, 5 Dec

4:48 p.m. - 10:30 a.m.SEA-LHR

9h 42mdirect

6:20 a.m. - 11:25 a.m.LHR-SEA

13h 05m1 stop

C$ 806Delta

Find Deal

Wed, 3 Dec - Tue, 20 Jan

4:48 p.m. - 10:30 a.m.SEA-LHR

9h 42mdirect

6:30 a.m. - 11:45 a.m.LHR-SEA

13h 15m1 stop

C$ 808Delta

Find Deal

Sun, 9 Nov - Fri, 28 Nov

6:50 p.m. - 12:20 p.m.SEA-LHR

9h 30mdirect

2:55 p.m. - 4:55 p.m.LHR-SEA

10h 00mdirect

C$ 816British Airways

Find Deal

Tue, 2 Dec - Thu, 22 Jan

11:15 a.m. - 10:00 a.m.SEA-LHR

14h 45m1 stop

12:20 p.m. - 2:58 p.m.LHR-SEA

10h 38mdirect

C$ 823Virgin Atlantic

Find Deal

Wed, 26 Nov - Wed, 3 Dec

6:50 p.m. - 12:20 p.m.SEA-LHR

9h 30mdirect

2:55 p.m. - 4:55 p.m.LHR-SEA

10h 00mdirect

C$ 827British Airways

Find Deal

Sun, 11 Jan - Fri, 23 Jan

Icelandair flights from Seattle to London Heathrow Airport

Our best Icelandair deals on Seattle to London Heathrow Airport flight tickets

Icelandair

2 Dec

SEA2:35 p.m.Seattle/Tacoma Intl

20h 55m

1 stop

LHR7:30 p.m.London Heathrow

23 Jan

LHR12:15 p.m.London Heathrow

12h 45m

1 stop

SEA5:00 p.m.Seattle/Tacoma Intl

C$ 727

Find similar

Icelandair

11 Nov

SEA2:35 p.m.Seattle/Tacoma Intl

12h 15m

1 stop

LHR10:50 a.m.London Heathrow

17 Nov

LHR8:35 p.m.London Heathrow

28h 25m

1 stop

SEA5:00 p.m.Seattle/Tacoma Intl

C$ 728

Find similar

Icelandair

24 Nov

SEA2:35 p.m.Seattle/Tacoma Intl

12h 15m

1 stop

LHR10:50 a.m.London Heathrow

6 Dec

LHR8:35 p.m.London Heathrow

28h 25m

1 stop

SEA5:00 p.m.Seattle/Tacoma Intl

C$ 729

Find similar

United Airlines flights from Seattle to London Heathrow Airport

Our best United Airlines deals on Seattle to London Heathrow Airport flight tickets

United Airlines

22 Nov

SEA8:00 p.m.Seattle/Tacoma Intl

31h 50m

1 stop

LHR11:50 a.m.London Heathrow

3 Dec

LHR6:35 a.m.London Heathrow

14h 45m

1 stop

SEA1:20 p.m.Seattle/Tacoma Intl

C$ 844

Find similar

United Airlines

30 Dec

SEA10:05 a.m.Seattle/Tacoma Intl

17h 45m

1 stop

LHR11:50 a.m.London Heathrow

20 Feb

LHR6:35 a.m.London Heathrow

14h 45m

1 stop

SEA1:20 p.m.Seattle/Tacoma Intl

C$ 845

Find similar

United Airlines

29 Dec

SEA7:05 a.m.Seattle/Tacoma Intl

16h 20m

1 stop

LHR7:25 a.m.London Heathrow

18 Feb

LHR6:35 a.m.London Heathrow

14h 45m

1 stop

SEA1:20 p.m.Seattle/Tacoma Intl

C$ 852

Find similar

momondo Fare Finder

Use the filters below to find and compare flights from Seattle to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 2/12

2:35 p.m.-7:30 p.m.

1 stop20h 55m

London Heathrow

Fri 23/1

12:15 p.m.-5:00 p.m.

1 stop12h 45m

C$ 727

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 11/11

2:35 p.m.-10:50 a.m.

1 stop12h 15m

London Heathrow

Mon 17/11

8:35 p.m.-5:00 p.m.

1 stop28h 25m

C$ 728

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 24/11

2:35 p.m.-10:50 a.m.

1 stop12h 15m

London Heathrow

Sat 6/12

8:35 p.m.-5:00 p.m.

1 stop28h 25m

C$ 729

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Fri 13/3

3:35 p.m.-10:50 a.m.

1 stop12h 15m

London Heathrow

Sun 29/3

9:25 p.m.-8:45 p.m.

1 stop31h 20m

C$ 732

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 24/11

8:05 p.m.-3:35 p.m.

1 stop11h 30m

London Heathrow

Fri 5/12

12:10 p.m.-6:20 p.m.

1 stop14h 10m

C$ 780

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 3/12

4:48 p.m.-10:30 a.m.

Nonstop9h 42m

London Heathrow

Tue 20/1

6:20 a.m.-11:25 a.m.

1 stop13h 05m

C$ 806

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 9/11

4:48 p.m.-10:30 a.m.

Nonstop9h 42m

London Heathrow

Fri 28/11

6:30 a.m.-11:45 a.m.

1 stop13h 15m

C$ 808

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 2/12

6:50 p.m.-12:20 p.m.

Nonstop9h 30m

London Heathrow

Thu 22/1

2:55 p.m.-4:55 p.m.

Nonstop10h 00m

C$ 816

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 26/11

11:15 a.m.-10:00 a.m.

1 stop14h 45m

London Heathrow

Wed 3/12

12:20 p.m.-2:58 p.m.

Nonstop10h 38m

C$ 823

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 11/1

6:50 p.m.-12:20 p.m.

Nonstop9h 30m

London Heathrow

Fri 23/1

2:55 p.m.-4:55 p.m.

Nonstop10h 00m

C$ 827

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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

Prices

Airlines

Delays

Other information

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 C$ 953. If you aren’t able to travel to London Heathrow Airport during the month of March, then flying in February is also cheap. Prices for this month can be found on momondo for an average of C$ 971.

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

According to our data, Sunday is the cheapest day to fly to London Heathrow Airport from Seattle. The lowest ticket price found for a Sunday departure recently was C$ 1,177. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. When flying out on a Wednesday, the most expensive travel day of the week, you can expect to see flight prices from Seattle to London Heathrow Airport for around C$ 1,284.

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

Our data shows that the cheapest Seattle to London Heathrow Airport flights are usually those with departure times in the morning. Our users have found flights to London Heathrow Airport in the morning for as low as C$ 950. In the afternoon is when there is more demand to fly to London Heathrow Airport, so prices are often more expensive at around C$ 1,290 per ticket.

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 weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around C$ 1,122 when searching 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 C$ 985 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.

Can stopping save me money on Seattle to London Heathrow Airport flights?

No. A direct flight is the cheapest option for a flight between Seattle to London Heathrow Airport.

How have Seattle to London Heathrow Airport flight prices changed over time?

As of October 2025, prices for Seattle to London Heathrow Airport flights are approximately 42% 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	C$ 481
Fastest flight time	9h 15m
Direct flights	Every day

The best one-way flight to London Heathrow Airport from Seattle in the past 72 hours is C$ 481. The best round-trip flight deal from Seattle to London Heathrow Airport found on momondo in the last 72 hours is C$ 934.

The fastest flight from Seattle to London Heathrow Airport takes 9h 15m

Direct flights go from Seattle to London Heathrow Airport every day.

Search flight deals

How far is Seattle/Tacoma Intl to London Heathrow by plane?
London Heathrow is 7683.2 km away from Seattle/Tacoma Intl. A reasonable flight in good conditions will take 9h 30m.
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 updated daily.
How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to London Heathrow Airport?
As of October 2025, there are 4 operators available to choose from 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?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify 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?
momondo data reveals that the most frequently booked plane model on the route from Seattle to London Heathrow Airport is Boeing 787-10 Dreamliner, representing 25.94% of all bookings. The subsequent popular models are Airbus A330-200 at 15.50%, Boeing 787-9 Dreamliner at 13.41%, and Airbus A330-900neo at 13.00%.
What is the most popular airline from Seattle to London Heathrow Airport?
Based on momondo bookings for flights between Seattle and London Heathrow Airport, the leading airline is Virgin Atlantic, making up 46% of the total bookings. Other popular airlines include British Airways with 28%, Iberia with 17%, and Icelandair with 9%.

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
Icelandair	PriceFrom C$ 616	Free Cancellation	Rating 7.1 562 reviews	Search Icelandair flights
Virgin Atlantic	PriceFrom C$ 705	Free Cancellation	Rating 7.5 670 reviews	Search Virgin Atlantic flights
British Airways	PriceFrom C$ 709	Free Cancellation	Rating 6.7 7,485 reviews	Search British Airways flights
Iberia	PriceFrom C$ 732	Free Cancellation	Rating 7.0 3,001 reviews	Search Iberia flights

Virgin Atlantic Flights From Seattle to London Heathrow Airport
Virgin Atlantic operates around 8 flights from Seattle to London Heathrow Airport every week. The average price of these flights found in the last 72 hours has been C$ 1,002, but momondo users have found Virgin Atlantic deals from Seattle to London Heathrow Airport from as low as C$ 705 round-trip. Virgin Atlantic has been scored 7.5/10 in 670 reviews.
Iberia Flights From Seattle to London Heathrow Airport
Another popular option for Seattle to London Heathrow Airport flights is Iberia (7.0/10, 3,001 ratings). Iberia flies from Seattle to London Heathrow Airport around 6 times per week, with deals starting from C$ 732 round-trip and rising to an average price of around C$ 867.

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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?

All flight searches from Seattle to London on momondo can be filtered to show those which offer flexible booking policies.

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

Once all potential Seattle to London flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Of course. momondo tracks the price of Seattle to London flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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Cheap flights from Seattle to London from C$ 514

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 29/12. 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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Icelandair flights from Seattle to London Heathrow Airport

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Our best United Airlines deals on Seattle to London Heathrow Airport flight tickets

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Use the filters below to find and compare flights from Seattle to London Heathrow Airport that are best for you.

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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?

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

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

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?

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.

Can stopping save me money on Seattle to London Heathrow Airport flights?

No. A direct flight is the cheapest option for a flight between Seattle to London Heathrow Airport.

How have Seattle to London Heathrow Airport flight prices changed over time?

As of October 2025, prices for Seattle to London Heathrow Airport flights are approximately 42% cheaper when compared to flights at the same time last year.

What is the cheapest airline that flies from Seattle/Tacoma Intl to London Heathrow?

WestJet, United Airlines, and Air Canada are the most popular carriers operating from Seattle/Tacoma Intl to London Heathrow

Which airlines fly to London Heathrow Airport?

How often are flights from Seattle to London delayed?

Historically, on average around 17% of flights between Seattle and London have experienced a delay on any given week. The average delay length over the past 12 months has been 131 minutes.

What is the most punctual flight time for Seattle to London flights?

Generally, flights departing in the early afternoon tend to experience fewer delays. Flights departing in the evening have, in the past, seen delays more frequently in comparison.

What day of the week experiences the fewest flight delays on this route?

Friday is statistically the day of the week that experiences the fewest delays on this flight route. Sunday has historically seen more delays on average compared to the rest of the week.

Which airline has the best punctuality record on Seattle to London flights?

According to our data, La Costena has had the lowest number of delays on this route over the last 12 months, with no flights being classified as delayed.

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

As of October 2025, there are 10 flights per day flying from Seattle to London Heathrow Airport. The most common time of day flights depart is 5:00p.m., with 56% of flights taking off in the afternoon.

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

The number of flights available between Seattle and London Heathrow Airport is 76 per week as of October 2025. The most frequent departure day is Tue, with 20% of weekly flights leaving on this day.

When to book flights from Seattle to London Heathrow Airport

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

Fastest flight time

Direct flights

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

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

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?

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

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

Virgin Atlantic Flights From Seattle to London Heathrow Airport

Iberia Flights From Seattle to London Heathrow Airport

Travelling to a place near London?

Why use momondo?

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

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

How can momondo help me find flights 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?

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 — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to London