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

On average, it takes 9h 25m 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 Bellingham and into London Heathrow Airport, then the flight time is around 13h 36m.

What airlines fly to London Heathrow Airport?

Delta, Virgin Atlantic and British Airways are the top three most popular airlines that fly to London Heathrow Airport from State of Washington according to our data. Delta is the first choice among our users, with 30% of people opting to fly with this airline when traveling to London Heathrow Airport. Keep in mind that there are 13 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.

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

Iberia, Delta, and United Airlines are the most popular carriers operating from Washington to London Heathrow

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 November 2026, there are 13 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.

$326 Cheap Flights from State of Washington to London Heathrow Airport in 2026/27

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 87 per week as of November 2026. The most frequent departure day is Mon, with 15% of weekly flights leaving on this day.

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Washington to London

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

2:35 pm - 10:50 amSEA Seattle/Tacoma Intl-LHR London Heathrow

12h 15m1 stop Reykjavik Keflavik Intl

12:15 pm - 5:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

12h 45m1 stop Reykjavik Keflavik Intl

$665Icelandair

Sun, Jan 3 - Tue, Jan 19

3:40 pm - 11:55 amSEA Seattle/Tacoma Intl-LHR London Heathrow

12h 15m1 stop Reykjavik Keflavik Intl

1:05 pm - 5:55 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

12h 50m1 stop Reykjavik Keflavik Intl

$667Icelandair

Sat, Apr 10 - Thu, Apr 15

2:35 pm - 4:25 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

17h 50m2 stops Reykjavik Keflavik Intl Oslo Gardermoen

6:40 pm - 5:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

30h 20m3 stops Kastrup Copenhagen Oslo Gardermoen Reykjavik Keflavik Intl

$694Multiple Airlines

Tue, Feb 2 - Mon, Feb 15

2:35 pm - 4:00 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

17h 25m2 stops Reykjavik Keflavik Intl Kastrup Copenhagen

6:40 am - 5:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

18h 20m2 stops Kastrup Copenhagen Reykjavik Keflavik Intl

$696Multiple Airlines

Tue, Jan 12 - Tue, Jan 19

7:15 am - 9:20 amSEA Seattle/Tacoma Intl-LHR London Heathrow

42h 05m2 stops San Francisco Kastrup Copenhagen

6:40 am - 10:02 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

23h 22m2 stops Kastrup Copenhagen Los Angeles

$725Scandinavian Airlines

Fri, Dec 4 - Mon, Dec 7

7:15 am - 4:00 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

24h 45m2 stops San Francisco Kastrup Copenhagen

6:40 am - 10:55 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

24h 15m2 stops Kastrup Copenhagen Boston Logan Intl

$725Scandinavian Airlines

Fri, Dec 4 - Sun, Dec 6

10:10 am - 7:10 amSEA Seattle/Tacoma Intl-LHR London Heathrow

37h 00m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl

6:30 am - 2:37 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

16h 07m2 stops Frankfurt am Main Vancouver Intl

$748Lufthansa

Tue, Feb 9 - Fri, Feb 12

1:35 pm - 6:50 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 15mnonstop

9:50 am - 11:35 amLHR London Heathrow-SEA Seattle/Tacoma Intl

9h 45mnonstop

$756British Airways

Tue, Apr 6 - Tue, Apr 20

6:50 pm - 5:05 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

14h 15m1 stop Munich Franz Josef Strauss

7:25 am - 12:14 amLHR London Heathrow-SEA Seattle/Tacoma Intl

24h 49m2 stops Munich Franz Josef Strauss Chicago O'Hare Intl

$768Lufthansa

Wed, Apr 28 - Fri, Apr 30

6:45 pm - 12:10 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

9:25 am - 11:25 amLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 00mnonstop

$842British Airways

Fri, Nov 27 - Sat, Dec 19

Cheap last minute flights

Enter your travel dates to find the best prices.

7:45 am - 5:40 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

25h 55m2 stops Toronto Pearson Intl Kastrup Copenhagen

6:40 am - 8:59 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

22h 19m2 stops Kastrup Copenhagen Toronto Pearson Intl

$696Multiple Airlines

Thu, Nov 12 - Wed, Nov 18

2:35 pm - 10:50 amSEA Seattle/Tacoma Intl-LHR London Heathrow

12h 15m1 stop Reykjavik Keflavik Intl

12:15 pm - 5:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

12h 45m1 stop Reykjavik Keflavik Intl

$701Icelandair

Fri, Nov 13 - Sat, Nov 21

2:35 pm - 10:50 amSEA Seattle/Tacoma Intl-LHR London Heathrow

12h 15m1 stop Reykjavik Keflavik Intl

12:15 pm - 5:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

12h 45m1 stop Reykjavik Keflavik Intl

$701Icelandair

Fri, Nov 13 - Sun, Nov 22

2:35 pm - 9:40 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

23h 05m2 stops Reykjavik Keflavik Intl Kastrup Copenhagen

6:40 pm - 5:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

30h 20m2 stops Kastrup Copenhagen Reykjavik Keflavik Intl

$704Multiple Airlines

Sun, Nov 15 - Wed, Nov 18

7:45 am - 4:00 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

24h 15m2 stops Chicago O'Hare Intl Kastrup Copenhagen

5:00 pm - 8:24 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

35h 24m2 stops Kastrup Copenhagen San Francisco

$845Scandinavian Airlines

Sat, Nov 14 - Tue, Dec 1

7:27 am - 4:00 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

24h 33m2 stops Chicago O'Hare Intl Kastrup Copenhagen

6:40 pm - 8:24 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

33h 44m2 stops Kastrup Copenhagen San Francisco

$845Scandinavian Airlines

Sun, Nov 15 - Tue, Dec 1

1:50 pm - 12:50 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

15h 00m1 stop Frankfurt am Main

6:35 am - 1:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

14h 25m1 stop Munich Franz Josef Strauss

$906Lufthansa

Wed, Nov 11 - Fri, Nov 13

2:50 pm - 1:00 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

14h 10m1 stop Munich Franz Josef Strauss

6:35 am - 11:20 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

24h 45m2 stops Munich Franz Josef Strauss Chicago O'Hare Intl

$906Lufthansa

Wed, Nov 11 - Fri, Nov 13

10:52 pm - 6:20 amSEA Seattle/Tacoma Intl-LHR London Heathrow

23h 28m1 stop New York John F Kennedy Intl

6:20 am - 1:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

15h 30m1 stop Paris Charles de Gaulle

$953Delta

Mon, Nov 16 - Thu, Nov 19

10:52 pm - 6:20 amSEA Seattle/Tacoma Intl-LHR London Heathrow

23h 28m1 stop New York John F Kennedy Intl

6:20 am - 1:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

15h 30m1 stop Paris Charles de Gaulle

$953Delta

Sat, Nov 14 - Tue, Nov 17

Cheap direct flights

Enter your travel dates to find the best prices.

1:35 pm - 6:50 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 15mnonstop

9:50 am - 11:35 amLHR London Heathrow-SEA Seattle/Tacoma Intl

9h 45mnonstop

$756British Airways

Tue, Apr 6 - Tue, Apr 20

6:45 pm - 12:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 35mnonstop

2:45 pm - 5:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 15mnonstop

$790Alaska Airlines

Sun, Dec 6 - Thu, Dec 10

4:50 pm - 10:40 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 50mnonstop

12:20 pm - 2:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 30mnonstop

$802Virgin Atlantic

Mon, Dec 7 - Fri, Dec 25

4:55 pm - 10:40 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 45mnonstop

12:20 pm - 2:45 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 25mnonstop

$807Virgin Atlantic

Sun, Jan 3 - Tue, Jan 19

4:50 pm - 10:40 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 50mnonstop

12:20 pm - 2:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 30mnonstop

$808KLM

Tue, Dec 8 - Fri, Dec 25

4:50 pm - 10:40 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 50mnonstop

12:20 pm - 2:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 30mnonstop

$809Delta

Wed, Dec 9 - Tue, Dec 15

4:50 pm - 10:40 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 50mnonstop

12:20 pm - 2:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 30mnonstop

$809Delta

Sun, Dec 6 - Tue, Dec 15

6:45 pm - 12:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 35mnonstop

2:45 pm - 5:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 15mnonstop

$809Alaska Airlines

Sun, Dec 6 - Thu, Dec 10

4:50 pm - 10:40 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 50mnonstop

12:20 pm - 2:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 30mnonstop

$815KLM

Mon, Dec 7 - Fri, Dec 25

6:45 pm - 12:10 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

9:25 am - 11:25 amLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 00mnonstop

$842British Airways

Fri, Nov 27 - Sat, Dec 19

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? 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

Alaska Airlines flights from State of Washington to London Heathrow Airport

Our best Alaska Airlines deals on State of Washington to London Heathrow Airport flight tickets

Alaska Airlines

Mar 1

GEG5:00 amSpokane

23h 20m

1 stop

LHR12:20 pmLondon Heathrow

Mar 3

LHR2:45 pmLondon Heathrow

16h 12m

1 stop

GEG10:57 pmSpokane

$896

Alaska Airlines

Mar 1

GEG12:41 pmSpokane

15h 39m

1 stop

LHR12:20 pmLondon Heathrow

Mar 3

LHR2:45 pmLondon Heathrow

28h 52m

1 stop

GEG11:37 amSpokane

$897

Alaska Airlines

Apr 12

GEG3:20 pmSpokane

15h 45m

1 stop

LHR3:05 pmLondon Heathrow

May 11

LHR5:00 pmLondon Heathrow

14h 58m

1 stop

GEG11:58 pmSpokane

$902

Icelandair flights from State of Washington to London Heathrow Airport

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

Icelandair

Nov 28

SEA2:35 pmSeattle/Tacoma Intl

20h 55m

1 stop

LHR7:30 pmLondon Heathrow

Dec 5

LHR12:15 pmLondon Heathrow

12h 45m

1 stop

SEA5:00 pmSeattle/Tacoma Intl

$656

Icelandair

Jan 3

SEA2:35 pmSeattle/Tacoma Intl

12h 15m

1 stop

LHR10:50 amLondon Heathrow

Jan 19

LHR12:15 pmLondon Heathrow

12h 45m

1 stop

SEA5:00 pmSeattle/Tacoma Intl

$665

Icelandair

Jan 22

SEA2:35 pmSeattle/Tacoma Intl

12h 15m

1 stop

LHR10:50 amLondon Heathrow

Jan 30

LHR12:15 pmLondon Heathrow

12h 45m

1 stop

SEA5:00 pmSeattle/Tacoma Intl

$668

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

Cheapest round-trip

SeattleLondon

SEA Seattle/Tacoma Intl - LHR London Heathrow

SEALHR

Seattle/Tacoma Intl

Sun 1/3

2:35 pm-10:50 am

1 stop12h 15m

London Heathrow

Tue 1/19

12:15 pm-5:00 pm

1 stop12h 45m

$665

SeattleLondon

SEA Seattle/Tacoma Intl - LHR London Heathrow

SEALHR

Seattle/Tacoma Intl

Sat 4/10

3:40 pm-11:55 am

1 stop12h 15m

London Heathrow

Thu 4/15

1:05 pm-5:55 pm

1 stop12h 50m

$667

SeattleLondon

SEA Seattle/Tacoma Intl - LHR London Heathrow

SEALHR

Seattle/Tacoma Intl

Tue 2/2

2:35 pm-4:25 pm

2 stops17h 50m

London Heathrow

Mon 2/15

6:40 pm-5:00 pm

3 stops30h 20m

$694

SeattleLondon

SEA Seattle/Tacoma Intl - LHR London Heathrow

SEALHR

Seattle/Tacoma Intl

Tue 1/12

2:35 pm-4:00 pm

2 stops17h 25m

London Heathrow

Tue 1/19

6:40 am-5:00 pm

2 stops18h 20m

$696

SeattleLondon

SEA Seattle/Tacoma Intl - LHR London Heathrow

SEALHR

Seattle/Tacoma Intl

Fri 12/4

7:15 am-9:20 am

2 stops42h 05m

London Heathrow

Mon 12/7

6:40 am-10:02 pm

2 stops23h 22m

$725

SeattleLondon

SEA Seattle/Tacoma Intl - LHR London Heathrow

SEALHR

Seattle/Tacoma Intl

Fri 12/4

7:15 am-4:00 pm

2 stops24h 45m

London Heathrow

Sun 12/6

6:40 am-10:55 pm

2 stops24h 15m

$725

SeattleLondon

SEA Seattle/Tacoma Intl - LHR London Heathrow

SEALHR

Seattle/Tacoma Intl

Tue 2/9

10:10 am-7:10 am

2 stops37h 00m

London Heathrow

Fri 2/12

6:30 am-2:37 pm

2 stops16h 07m

$748

Quickest round-trip

SeattleLondon

SEA Seattle/Tacoma Intl - LHR London Heathrow

SEALHR

Seattle/Tacoma Intl

Tue 4/6

1:35 pm-6:50 am

Nonstop9h 15m

London Heathrow

Tue 4/20

9:50 am-11:35 am

Nonstop9h 45m

$756

SeattleLondon

SEA Seattle/Tacoma Intl - LHR London Heathrow

SEALHR

Seattle/Tacoma Intl

Wed 4/28

6:50 pm-5:05 pm

1 stop14h 15m

London Heathrow

Fri 4/30

7:25 am-12:14 am

2 stops24h 49m

$768

SeattleLondon

SEA Seattle/Tacoma Intl - LHR London Heathrow

SEALHR

Seattle/Tacoma Intl

Fri 11/27

6:45 pm-12:10 pm

Nonstop9h 25m

London Heathrow

Sat 12/19

9:25 am-11:25 am

Nonstop10h 00m

$842

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 January is, on average, the cheapest month to fly to London Heathrow Airport from State of Washington, with most prices found around $732. If you’re not able to fly to London Heathrow Airport in January, then February is your next best option. Flight prices from State of Washington to London Heathrow Airport during February average around $788.

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

Our data shows that Monday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $924. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $1,041.

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 at noon. momondo users have found flights departing from State of Washington to London Heathrow Airport at noon for as low as $964. 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 afternoon are often more expensive with an average ticket price of $1,001.

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 from Washington 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 $922 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 $862 on momondo.

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

There are 4 cabin classes available to choose from on State of Washington 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.

Can stopping save me money on State of Washington to London Heathrow Airport flights?

No. A direct flight is the cheapest option for a flight between State of Washington 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	$326
Fastest flight time	9h 25m
Direct flights	Every day

The best one-way flight to London Heathrow Airport from State of Washington in the past 72 hours is $326. The best round-trip flight deal from State of Washington to London Heathrow Airport found on momondo in the last 72 hours is $665.

The fastest flight from State of Washington to London Heathrow Airport takes 9h 25m

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

Search flight deals

Frequently asked questions about flying from Washington to London Heathrow Airport

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 November 2026, there are 13 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 30.63% of the total bookings. Other popular models include Airbus A330-200 with 20.86%, Airbus A330-900neo with 12.96%, and Boeing 787-9 Dreamliner with 12.59%.

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
United Airlines	PriceFrom $379	Free Cancellation	Rating 7.3 10,472 reviews	Search United Airlines flights
Icelandair	PriceFrom $523	Free Cancellation	Rating 7.0 766 reviews	Search Icelandair flights
Finnair	PriceFrom $542	Free Cancellation	Rating 7.6 1,413 reviews	Search Finnair flights
Virgin Atlantic	PriceFrom $578	Free Cancellation	Rating 7.5 698 reviews	Search Virgin Atlantic flights
British Airways	PriceFrom $594	Free Cancellation	Rating 6.7 8,285 reviews	Search British Airways flights
Aer Lingus	PriceFrom $607	Free Cancellation	Rating 7.3 1,882 reviews	Search Aer Lingus flights
Delta	PriceFrom $608	Free Cancellation	Rating 7.8 8,704 reviews	Search Delta flights
American Airlines	PriceFrom $638	Free Cancellation	Rating 7.0 12,225 reviews	Search American Airlines flights
Air France	PriceFrom $656	Free Cancellation	Rating 7.5 1,647 reviews	Search Air France flights
KLM	PriceFrom $660	Free Cancellation	Rating 7.8 1,595 reviews	Search KLM flights

Hounslow

Gatwick

Croydon

Hayes

Haverhill

Milton Keynes

Luton

Stansted

Kingston upon Thames

Dover

Watford

Richmond

Stratford-upon-Avon

Wembley

Crawley

Worthing

Brentford

Harrow

Canterbury

Hook

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

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

Thu 12/10

Thu 12/17

Email me momondo's favorite 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

Other flights from Washington

Other flights to London

Airlines

Cabin classes

Complete your trip

Feeling lucky

Popular cities in the United Kingdom

Flights to London Gatwick Airportfrom $445

Flights to London Stansted Airportfrom $500

Flights to London City Airportfrom $730

Flights to London Luton Airportfrom $489

Flights to Glasgow Intl Airportfrom $623

Flights to Belfast City Airportfrom $700

Flights to Belfast Intl Airportfrom $700

Flights to London Southend Airportfrom $644

Cheap flights from Washington to London from $326

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 4/21. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Find the cheapest flights from Washington to London

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Cheap direct flights

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Alaska Airlines flights from State of Washington to London Heathrow Airport

Our best Alaska Airlines deals on State of Washington to London Heathrow Airport flight tickets

Icelandair flights from State of Washington to London Heathrow Airport

Our best Icelandair 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.

See travel insights to London from

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

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

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

Can stopping save me money on State of Washington to London Heathrow Airport flights?

What is the cheapest airline that flies 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?

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

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

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

Best Price Found

Fastest flight time

Direct flights

Frequently asked questions about flying from 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?

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

State of Washington flight routes

According to popular flight searches on momondo this year

London Heathrow Airport flight routes

According to popular flight searches on momondo this year

Fly your favorite airline to London

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to London

List of cabin classes available on flights landing in London. Availability may vary depending on flight origin and airline.

Complete your trip to London

Explore popular destinations other users love

According to popular flight searches on momondo this year