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

WestJet is the most popular carrier operating from Washington to London Heathrow

What airlines fly to London Heathrow Airport?

British Airways, Delta and Virgin Atlantic are the top three most popular airlines that fly to London Heathrow Airport from State of Washington according to our data. British Airways is the first choice among our users, with 35% of people opting to fly with this airline when traveling to London Heathrow Airport. Keep in mind that there are 15 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.

How long does it take to fly to London Heathrow Airport?

On average, it takes 9h 20m to fly from State of Washington to London Heathrow Airport if you fly out of Seattle (the most popular airport in State of Washington) and into London Heathrow Airport (the most popular airport in London Heathrow Airport). If you’re flying out of Spokane and into London Heathrow Airport, then the flight time is around 12h 02m.

When did momondo last update prices for flights from Washington to London Heathrow Airport?

Prices for flights from Washington to London Heathrow Airport are refreshed on a daily basis.

How many operators does momondo search for flights from Washington to London Heathrow Airport?

As of August 2025, there are 15 operators available to choose from for flights from Washington to London Heathrow Airport.

How old do you have to be to fly from Washington 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 Washington 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.

$211 Cheap Flights from State of Washington to London Heathrow Airport in 2025

Q: How many flights depart from State of Washington to London Heathrow Airport on average per week?

The number of flights available between State of Washington and London Heathrow Airport is 195 per week as of August 2025. The most frequent departure day is Tue, with 16% of weekly flights leaving on this day.

Q: How many flights depart from State of Washington to London Heathrow Airport on average per day?

The number of flights available between State of Washington and London Heathrow Airport is 27 per day as of August 2025. The most frequent departure time is 8:00PM, with 57% of daily flights leaving in the evening.

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Find the cheapest flights from Washington to London

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

3:45 pm - 7:30 pmSEA-LHR

19h 45m1 stop

8:35 pm - 5:00 pmLHR-SEA

28h 25m1 stop

$442Icelandair

Find Deal

Wed, Nov 19 - Sun, Nov 30

9:05 pm - 3:35 pmSEA-LHR

11h 30m1 stop

12:10 pm - 6:20 pmLHR-SEA

14h 10m1 stop

$473Aer Lingus

Find Deal

Wed, Oct 29 - Wed, Nov 5

7:15 am - 6:30 amSEA-LHR

15h 15m1 stop

10:50 am - 4:59 pmLHR-SEA

14h 09m1 stop

$478

Find Deal

Tue, Sep 9 - Wed, Sep 17

5:50 am - 10:10 amSEA-LHR

20h 20m2 stops

7:40 am - 1:20 pmLHR-SEA

13h 40m1 stop

$484

Find Deal

Tue, Dec 2 - Wed, Dec 10

5:35 pm - 11:20 amSEA-LHR

9h 45mnonstop

6:15 am - 11:15 amLHR-SEA

13h 00m1 stop

$485Virgin Atlantic

Find Deal

Sun, Aug 24 - Tue, Sep 9

5:35 pm - 11:20 amSEA-LHR

9h 45mnonstop

6:15 am - 11:15 amLHR-SEA

13h 00m1 stop

$487Virgin Atlantic

Find Deal

Sun, Aug 24 - Tue, Sep 9

3:40 pm - 11:50 amSEA-LHR

13h 10m1 stop

7:40 am - 2:20 pmLHR-SEA

13h 40m1 stop

$489Lufthansa

Find Deal

Fri, Oct 31 - Sun, Nov 2

4:25 pm - 4:25 pmSEA-LHR

16h 00m1 stop

8:45 am - 6:36 pmLHR-SEA

17h 51m2 stops

$491SWISS

Find Deal

Mon, Sep 8 - Tue, Sep 23

4:25 pm - 4:25 pmSEA-LHR

16h 00m1 stop

8:05 pm - 6:36 pmLHR-SEA

30h 31m2 stops

$493SWISS

Find Deal

Mon, Sep 8 - Mon, Sep 15

3:25 pm - 1:20 pmPDX-LHR

13h 55m1 stop

2:30 pm - 6:30 pmLHR-PDX

35h 00m1 stop

$534Lufthansa

Find Deal

Wed, Oct 22 - Wed, Oct 29

British Airways flights from State of Washington to London Heathrow Airport

Our best British Airways deals on State of Washington to London Heathrow Airport flight tickets

British Airways

Nov 12

SEA6:50 pmSeattle/Tacoma Intl

9h 30m

LHR12:20 pmLondon Heathrow

Nov 19

LHR2:55 pmLondon Heathrow

10h 00m

SEA4:55 pmSeattle/Tacoma Intl

$494

Find similar

British Airways

Oct 1

SEA1:30 pmSeattle/Tacoma Intl

9h 20m

LHR6:50 amLondon Heathrow

Oct 14

LHR9:25 amLondon Heathrow

9h 45m

SEA11:10 amSeattle/Tacoma Intl

$495

Find similar

British Airways

Nov 12

SEA6:50 pmSeattle/Tacoma Intl

9h 30m

LHR12:20 pmLondon Heathrow

Nov 20

LHR2:55 pmLondon Heathrow

10h 00m

SEA4:55 pmSeattle/Tacoma Intl

$515

Find similar

Air Canada flights from State of Washington to London Heathrow Airport

Our best Air Canada deals on State of Washington to London Heathrow Airport flight tickets

Air Canada

Aug 19

SEA7:20 amSeattle/Tacoma Intl

15h 10m

1 stop

LHR6:30 amLondon Heathrow

Sep 10

LHR5:10 pmLondon Heathrow

33h 26m

2 stops

SEA6:36 pmSeattle/Tacoma Intl

$497

Find similar

Air Canada

Aug 26

SEA7:20 amSeattle/Tacoma Intl

15h 10m

1 stop

LHR6:30 amLondon Heathrow

Sep 22

LHR5:10 pmLondon Heathrow

33h 26m

2 stops

SEA6:36 pmSeattle/Tacoma Intl

$498

Find similar

Air Canada

Oct 5

PDX9:55 amPortland

15h 40m

2 stops

LHR9:35 amLondon Heathrow

Oct 21

LHR2:10 pmLondon Heathrow

32h 36m

1 stop

PDX2:46 pmPortland

$506

Find similar

momondo Fare Finder

Use the filters below to find and compare flights from Washington 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 11/19

3:45 pm-7:30 pm

1 stop19h 45m

London Heathrow

Sun 11/30

8:35 pm-5:00 pm

1 stop28h 25m

$442

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 10/29

9:05 pm-3:35 pm

1 stop11h 30m

London Heathrow

Wed 11/5

12:10 pm-6:20 pm

1 stop14h 10m

$473

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 9/9

7:15 am-6:30 am

1 stop15h 15m

London Heathrow

Wed 9/17

10:50 am-4:59 pm

1 stop14h 09m

$478

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 12/2

5:50 am-10:10 am

2 stops20h 20m

London Heathrow

Wed 12/10

7:40 am-1:20 pm

1 stop13h 40m

$484

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 8/24

5:35 pm-11:20 am

Nonstop9h 45m

London Heathrow

Tue 9/9

6:15 am-11:15 am

1 stop13h 00m

$485

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 8/24

5:35 pm-11:20 am

Nonstop9h 45m

London Heathrow

Tue 9/9

6:15 am-11:15 am

1 stop13h 00m

$487

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Fri 10/31

3:40 pm-11:50 am

1 stop13h 10m

London Heathrow

Sun 11/2

7:40 am-2:20 pm

1 stop13h 40m

$489

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 9/8

4:25 pm-4:25 pm

1 stop16h 00m

London Heathrow

Tue 9/23

8:45 am-6:36 pm

2 stops17h 51m

$491

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 9/8

4:25 pm-4:25 pm

1 stop16h 00m

London Heathrow

Mon 9/15

8:05 pm-6:36 pm

2 stops30h 31m

$493

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 10/22

3:25 pm-1:20 pm

1 stop13h 55m

London Heathrow

Wed 10/29

2:30 pm-6:30 pm

1 stop35h 00m

$534

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 State of Washington 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

Other information

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 State of Washington, with most prices found around $684. If you’re not able to fly to London Heathrow Airport in March, then April is your next best option. Flight prices from State of Washington to London Heathrow Airport during April average around $699.

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 $810. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $932.

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 evening. momondo users have found flights departing from State of Washington to London Heathrow Airport in the evening for as low as $845. 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 Washington to London Heathrow flight route?

Fly from Seattle/Tacoma Intl to London Heathrow for the best Washington - 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 State of Washington when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around $804 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 State of Washington for as low as $701 on momondo.

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

There are 4 cabin classes available to choose from on Washington to London Heathrow flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Cheap State of Washington to London Heathrow Airport flight deals and tips

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

Best Price Found	$211
Fastest flight time	9h 20m
Direct flights	Every day

The best one-way flight to London Heathrow Airport from State of Washington in the past 72 hours is $211. The best round-trip flight deal from State of Washington to London Heathrow Airport found on momondo in the last 72 hours is $442.

The fastest flight from State of Washington to London Heathrow Airport takes 9h 20m

Direct flights go from State of Washington to London Heathrow Airport every day.

Search flight deals

When did momondo last update prices for flights from Washington to London Heathrow Airport?
Prices for flights from Washington to London Heathrow Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Washington to London Heathrow Airport?
As of August 2025, there are 15 operators available to choose from for flights from Washington to London Heathrow Airport.
How old do you have to be to fly from Washington 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 Washington 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 State of Washington to London Heathrow Airport?
Based on momondo bookings for flights between State of Washington and London Heathrow Airport, the leading plane model is Boeing 787-10 Dreamliner, making up 33.66% of the total bookings. Other popular models include Airbus A330-900neo with 20.70%, Boeing 777-300 with 12.83%, and Boeing 787-9 Dreamliner with 9.37%.

Best airlines flying from State of Washington to London Heathrow Airport

Compare and see reviews for airlines that fly from State of Washington to London Heathrow Airport with momondo

Airline	Rating	Free Cancellation	Price
Lufthansa	PriceFrom $378	Free Cancellation	Rating 6.8 7,317 reviews	Search Lufthansa flights
Icelandair	PriceFrom $500	Free Cancellation	Rating 7.0 526 reviews	Search Icelandair flights
Scandinavian Airlines	PriceFrom $532	Free Cancellation	Rating 7.4 1,466 reviews	Search Scandinavian Airlines flights
Air France	PriceFrom $545	Free Cancellation	Rating 7.4 1,467 reviews	Search Air France flights
United Airlines	PriceFrom $547	Free Cancellation	Rating 7.4 8,920 reviews	Search United Airlines flights
Finnair	PriceFrom $556	Free Cancellation	Rating 7.6 1,321 reviews	Search Finnair flights
British Airways	PriceFrom $567	Free Cancellation	Rating 6.6 7,265 reviews	Search British Airways flights
Aer Lingus	PriceFrom $576	Free Cancellation	Rating 7.1 1,212 reviews	Search Aer Lingus flights
Iberia	PriceFrom $578	Free Cancellation	Rating 7.0 2,878 reviews	Search Iberia flights
Delta	PriceFrom $588	Free Cancellation	Rating 8.0 7,979 reviews	Search Delta flights

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Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Washington to London. Millions of users trust and use momondo every year so you are in good hands.

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

Flights from Washington 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 Washington to London?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to London from Washington.

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

Yes momondo offers price alerts on flights to London from Washington. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your London Heathrow Airport trip

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Cheap flights from Washington to London from $211

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington to London departing on 10/28. 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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British Airways flights from State of Washington to London Heathrow Airport

Our best British Airways deals on State of Washington to London Heathrow Airport flight tickets

Air Canada flights from State of Washington to London Heathrow Airport

Our best Air Canada deals on State of Washington to London Heathrow Airport flight tickets

momondo Fare Finder

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

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How to get the cheapest flight ticket from State of Washington 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 to London Heathrow Airport?

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 $810. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $932.

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

What is the cheapest Washington to London Heathrow flight route?

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

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

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

There are 4 cabin classes available to choose from on Washington to London Heathrow flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

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

WestJet is the most popular carrier operating from Washington to London Heathrow

What airlines fly to London Heathrow Airport?

How many flights depart from State of Washington to London Heathrow Airport on average per day?

The number of flights available between State of Washington and London Heathrow Airport is 27 per day as of August 2025. The most frequent departure time is 8:00PM, with 57% of daily flights leaving in the evening.

How many flights depart from State of Washington to London Heathrow Airport on average per week?

The number of flights available between State of Washington and London Heathrow Airport is 195 per week as of August 2025. The most frequent departure day is Tue, with 16% of weekly flights leaving on this day.

How long does it take to fly to London Heathrow Airport?

Cheap State of Washington to London Heathrow Airport flight deals and tips

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

Best Price Found

Fastest flight time

Direct flights

When did momondo last update prices for flights from Washington to London Heathrow Airport?

How many operators does momondo search for flights from Washington to London Heathrow Airport?

How old do you have to be to fly from Washington 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 State of Washington to London Heathrow Airport?

Best airlines flying from State of Washington to London Heathrow Airport

Compare and see reviews for airlines that fly from State of Washington to London Heathrow Airport with momondo

Traveling to a place near London?

Why use momondo?

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

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

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

I’m not ready to book a flight from Washington 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