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

United Airlines is the most popular carrier operating from Seattle/Tacoma Intl to London Heathrow

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

According to our data, Virgin Atlantic has had the least delays on this route over the last 12 months, with about 6% of their flights experiencing any sort of delay.

How often are flights from Seattle to London delayed?

Historically, on average around 16% 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 123 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 at night have, in the past, seen delays more frequently in comparison.

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 53% of people opting to fly with this airline when travelling to London Heathrow Airport. Keep in mind that there are 3 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 day?

As of December 2025, there are 11 flights per day flying from Seattle to London Heathrow Airport. The most common time of day flights depart is 6:00p.m., with 51% 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 82 per week as of December 2025. The most frequent departure day is Thu, with 18% of weekly flights leaving on this day.

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

Tuesday 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.

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 December 2025, there are 3 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$ 483 Cheap Flights from Seattle to London Heathrow Airport in 2025/26

1 adult

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Early arrival? Instantly customize your results

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from Seattle to London

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

7:00 a.m. - 11:15 a.m.

SEA

LHR

20h 15m1 stop

8:30 a.m. - 10:43 p.m.

LHR

SEA

22h 13m2 stops

C$ 833Lufthansa

Wed, 7 Jan - Thu, 15 Jan

10:05 a.m. - 10:10 a.m.

SEA

LHR

16h 05m2 stops

7:40 a.m. - 1:20 p.m.

LHR

SEA

13h 40m1 stop

C$ 845Lufthansa

Tue, 10 Feb - Fri, 20 Feb

6:25 p.m. - 11:55 a.m.

SEA

LHR

9h 30mdirect

6:30 a.m. - 11:50 a.m.

LHR

SEA

13h 20m1 stop

C$ 847KLM

Mon, 12 Jan - Sun, 18 Jan

6:05 a.m. - 7:05 a.m.

SEA

LHR

17h 00m1 stop

6:30 a.m. - 11:40 a.m.

LHR

SEA

13h 10m1 stop

C$ 852Delta

Thu, 8 Jan - Fri, 13 Feb

2:02 p.m. - 5:40 p.m.

SEA

LHR

19h 38m2 stops

6:40 a.m. - 10:25 p.m.

LHR

SEA

23h 45m2 stops

C$ 854Scandinavian Airlines

Sat, 24 Jan - Sat, 31 Jan

4:45 p.m. - 10:30 a.m.

SEA

LHR

9h 45mdirect

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

LHR

SEA

13h 05m1 stop

C$ 855Delta

Wed, 21 Jan - Sat, 7 Feb

11:30 a.m. - 5:40 p.m.

SEA

LHR

22h 10m2 stops

7:30 p.m. - 10:22 p.m.

LHR

SEA

34h 52m2 stops

C$ 856Scandinavian Airlines

Sat, 31 Jan - Mon, 16 Feb

12:35 p.m. - 1:30 p.m.

SEA

LHR

16h 55m2 stops

6:35 a.m. - 1:20 p.m.

LHR

SEA

14h 45m1 stop

C$ 858United Airlines

Fri, 23 Jan - Fri, 30 Jan

10:05 a.m. - 10:10 a.m.

SEA

LHR

16h 05m2 stops

11:10 a.m. - 10:43 p.m.

LHR

SEA

19h 33m2 stops

C$ 859Lufthansa

Tue, 3 Feb - Mon, 9 Feb

10:05 a.m. - 11:50 a.m.

SEA

LHR

17h 45m1 stop

6:30 a.m. - 12:10 p.m.

LHR

SEA

13h 40m1 stop

C$ 861United Airlines

Sat, 24 Jan - Sat, 31 Jan

Delta flights from Seattle to London Heathrow Airport

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

Delta

8 Jan

SEA6:05 a.m.Seattle/Tacoma Intl

17h 00m

1 stop

LHR7:05 a.m.London Heathrow

10 Feb

LHR6:30 a.m.London Heathrow

13h 10m

1 stop

SEA11:40 a.m.Seattle/Tacoma Intl

C$ 852

Find similar

Delta

21 Jan

SEA4:45 p.m.Seattle/Tacoma Intl

9h 45m

LHR10:30 a.m.London Heathrow

7 Feb

LHR6:20 a.m.London Heathrow

13h 05m

1 stop

SEA11:25 a.m.Seattle/Tacoma Intl

C$ 855

Find similar

Delta

21 Apr

SEA3:35 p.m.Seattle/Tacoma Intl

9h 25m

LHR9:00 a.m.London Heathrow

5 May

LHR9:55 a.m.London Heathrow

13h 55m

1 stop

SEA3:50 p.m.Seattle/Tacoma Intl

C$ 867

Find similar

Scandinavian Airlines flights from Seattle to London Heathrow Airport

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

Scandinavian Airlines

24 Jan

SEA2:02 p.m.Seattle/Tacoma Intl

19h 38m

2 stops

LHR5:40 p.m.London Heathrow

31 Jan

LHR6:40 a.m.London Heathrow

23h 45m

2 stops

SEA10:25 p.m.Seattle/Tacoma Intl

C$ 854

Find similar

Scandinavian Airlines

31 Jan

SEA11:30 a.m.Seattle/Tacoma Intl

22h 10m

2 stops

LHR5:40 p.m.London Heathrow

16 Feb

LHR7:30 p.m.London Heathrow

34h 52m

2 stops

SEA10:22 p.m.Seattle/Tacoma Intl

C$ 856

Find similar

Scandinavian Airlines

9 Jan

SEA7:10 a.m.Seattle/Tacoma Intl

24h 50m

2 stops

LHR4:00 p.m.London Heathrow

16 Jan

LHR7:30 p.m.London Heathrow

34h 55m

2 stops

SEA10:25 p.m.Seattle/Tacoma Intl

C$ 866

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

Wed 7/1

7:00 a.m.-11:15 a.m.

1 stop20h 15m

London Heathrow

Thu 15/1

8:30 a.m.-10:43 p.m.

2 stops22h 13m

C$ 833

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 10/2

10:05 a.m.-10:10 a.m.

2 stops16h 05m

London Heathrow

Fri 20/2

7:40 a.m.-1:20 p.m.

1 stop13h 40m

C$ 845

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 12/1

6:25 p.m.-11:55 a.m.

Nonstop9h 30m

London Heathrow

Sun 18/1

6:30 a.m.-11:50 a.m.

1 stop13h 20m

C$ 847

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Thu 8/1

6:05 a.m.-7:05 a.m.

1 stop17h 00m

London Heathrow

Fri 13/2

6:30 a.m.-11:40 a.m.

1 stop13h 10m

C$ 852

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sat 24/1

2:02 p.m.-5:40 p.m.

2 stops19h 38m

London Heathrow

Sat 31/1

6:40 a.m.-10:25 p.m.

2 stops23h 45m

C$ 854

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 21/1

4:45 p.m.-10:30 a.m.

Nonstop9h 45m

London Heathrow

Sat 7/2

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

1 stop13h 05m

C$ 855

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sat 31/1

11:30 a.m.-5:40 p.m.

2 stops22h 10m

London Heathrow

Mon 16/2

7:30 p.m.-10:22 p.m.

2 stops34h 52m

C$ 856

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Fri 23/1

12:35 p.m.-1:30 p.m.

2 stops16h 55m

London Heathrow

Fri 30/1

6:35 a.m.-1:20 p.m.

1 stop14h 45m

C$ 858

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 3/2

10:05 a.m.-10:10 a.m.

2 stops16h 05m

London Heathrow

Mon 9/2

11:10 a.m.-10:43 p.m.

2 stops19h 33m

C$ 859

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sat 24/1

10:05 a.m.-11:50 a.m.

1 stop17h 45m

London Heathrow

Sat 31/1

6:30 a.m.-12:10 p.m.

1 stop13h 40m

C$ 861

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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 cheapest month to fly to London Heathrow Airport?

The month of October is, on average, the cheapest month to fly to London Heathrow Airport from Seattle, with most prices found around C$ 912. If you aren’t able to travel to London Heathrow Airport during the month of October, then flying in March is also cheap. Prices for this month can be found on momondo for an average of C$ 943.

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$ 1,036. 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 Friday, the most expensive travel day of the week, you can expect to see flight prices from Seattle to London Heathrow Airport for around C$ 1,189.

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$ 938. In the afternoon is when there is more demand to fly to London Heathrow Airport, so prices are often more expensive at around C$ 1,182 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$ 1,098 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$ 954 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?

You could potentially save up to 12% on your flight if you consider stops on a Seattle to London Heathrow Airport flight.

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

As of December 2025, prices for Seattle to London Heathrow Airport flights are approximately 3% 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$ 487
Fastest flight time	9h 30m
Direct flights	Every day

The best one-way flight to London Heathrow Airport from Seattle in the past 72 hours is C$ 487. The best round-trip flight deal from Seattle to London Heathrow Airport found on momondo in the last 72 hours is C$ 978.

The fastest flight from Seattle to London Heathrow Airport takes 9h 30m

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 December 2025, there are 3 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 26.46% of all bookings. The subsequent popular models are Boeing 787-9 Dreamliner at 23.21%, Airbus A330-200 at 20.81%, and Airbus A330-900neo at 8.78%.
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 53% of the total bookings. Other popular airlines include British Airways with 29% and Iberia with 18%.

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
Iberia	PriceFrom C$ 626	Free Cancellation	Rating 7.0 3,045 reviews	Search Iberia flights
Virgin Atlantic	PriceFrom C$ 696	Free Cancellation	Rating 7.5 675 reviews	Search Virgin Atlantic flights
British Airways	PriceFrom C$ 700	Free Cancellation	Rating 6.7 7,571 reviews	Search British Airways flights

Virgin Atlantic Flights From Seattle to London Heathrow Airport
Virgin Atlantic operates around 10 flights from Seattle to London Heathrow Airport every week. The average price of these flights found in the last 72 hours has been C$ 996, but momondo users have found Virgin Atlantic deals from Seattle to London Heathrow Airport from as low as C$ 696 round-trip. Virgin Atlantic has been scored 7.5/10 in 675 reviews.
Iberia Flights From Seattle to London Heathrow Airport
Another popular option for Seattle to London Heathrow Airport flights is Iberia (7.0/10, 3,045 ratings). Iberia flies from Seattle to London Heathrow Airport around 5 times per week, with deals starting from C$ 626 round-trip and rising to an average price of around C$ 856.

Hounslow

Ipswich

Poole

Dartford

Gatwick

Ilford

Swindon

Chelmsford

Wokingham

Slough

Stratford-upon-Avon

Feltham

Hayes

Uxbridge

Wembley

Waterlooville

Newport

Basingstoke

Milton Keynes

Dover

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?

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.

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.

Start using Trips

Find my bookings

Get notified when prices go down

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

1 adult

Sat 10/1

Sat 17/1

Email me momondo's favourite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to London

Popular Cities in the United Kingdom

Flights to London Gatwick Airportfrom C$ 651

Flights to London City Airportfrom C$ 854

Flights to London Stansted Airportfrom C$ 641

Flights to London Luton Airportfrom C$ 659

Flights to London Southend Airportfrom C$ 725

Flights to Belfast Intl Airportfrom C$ 816

Flights to Glasgow Intl Airportfrom C$ 717

Flights to Belfast City Airportfrom C$ 827

Cheap flights from Seattle to London from C$ 483

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 13/2. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names, great deals

Big names, great deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Find the cheapest flights from Seattle to London

Cheap round-trip flights

Cheap one-way flights

Cheap last-minute flights

Cheap direct flights

Delta flights from Seattle to London Heathrow Airport

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

Scandinavian Airlines flights from Seattle to London Heathrow Airport

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

momondo Fare Finder

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

See travel insights to London from

How to get the cheapest flight ticket from Seattle to 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?

You could potentially save up to 12% on your flight if you consider stops on a Seattle to London Heathrow Airport flight.

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

As of December 2025, prices for Seattle to London Heathrow Airport flights are approximately 3% 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?

United Airlines is the most popular carrier 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 16% 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 123 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 at night have, in the past, seen delays more frequently in comparison.

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

Tuesday 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, Virgin Atlantic has had the least delays on this route over the last 12 months, with about 6% of their flights experiencing any sort of delay.

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

As of December 2025, there are 11 flights per day flying from Seattle to London Heathrow Airport. The most common time of day flights depart is 6:00p.m., with 51% 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 82 per week as of December 2025. The most frequent departure day is Thu, with 18% 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

Popular Cities in the United Kingdom

Popular flights according to clicks in the last 7 days on momondo