Which layover airport offers the lowest fares from London Heathrow Airport to Washington, D.C.?

Flights via Copenhagen (CPH) offer the lowest average round-trip price of $575.

What is the cheapest airline that flies from London Heathrow to Washington, D.C.?

Austrian Airlines, SWISS, and Icelandair are the most popular carriers operating from London Heathrow to Washington, D.C.

Which airline has the best punctuality record on London to Washington, D.C. flights?

According to our data, Virgin Atlantic have had the least number of delays on this route over the last 12 months; with about 10% of their flights experiencing any sort of delay.

Which airport is the most popular layover for flights between London Heathrow Airport and Washington, D.C.?

Dublin (DUB) was the most common stop: 64% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport has the shortest travel time from London Heathrow Airport to Washington, D.C.?

Flights connecting via Reykjavik (KEF) have the shortest average one-way travel time: 11h 15m.

How often are flights from London to Washington, D.C. delayed?

Historically, on average around 17% of flights between London and Washington, D.C. have experienced a delay on any given week. The average delay length over the past 12 months has been 132 minutes.

What is the most punctual flight time for London to Washington, D.C. flights?

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

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

Wednesday is statistically the day of the week which experiences the fewest number of delays on this flight route. Thursday has historically seen more delays on average compared to the rest of the week.

What airlines fly to Washington, D.C.?

British Airways, Delta and United Airlines are the top three most popular airlines that fly to Washington, D.C. from London Heathrow Airport according to our data. British Airways is the first choice among our users, with 58% of people opting to fly with this airline when traveling to Washington, D.C.. Keep in mind that there are 12 different airlines that fly to Washington, D.C. on a routine basis, so you have a few additional options to choose from.

Which layover airport has the shortest connection time from London Heathrow Airport to Washington, D.C.?

Reykjavik (KEF) has the shortest average layover time for this route: 1h 10m.

How many flights depart from London Heathrow Airport to Washington, D.C. on average per week?

163 flights are operational weekly from London Heathrow Airport to Washington, D.C. as of March 2026. The most popular departure day for this route is Tue, with 19% of flights per week taking off on this day.

How many flights depart from London Heathrow Airport to Washington, D.C. on average per day?

23 flights are operational daily from London Heathrow Airport to Washington, D.C. as of March 2026. The most popular departure time for this route is 4:00PM, with 100% of flights per day taking off in the afternoon.

How many operators does momondo search for flights from London Heathrow Airport to Washington, D.C.?

As of March 2026, there are 12 operators available to choose from for flights from London Heathrow Airport to Washington, D.C..

How old do you have to be to fly from London Heathrow Airport to Washington, D.C.?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from London Heathrow Airport to Washington, D.C..

What documentation or ID do you need to fly to Washington, D.C.?

The necessary travel and health documents for your Washington, D.C. trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$369 Cheap Flights from London Heathrow Airport to Washington, D.C. in 2026

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Find the cheapest flights from London Heathrow Airport to Washington, D.C.

Round-trip

One-way

Last minute

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Cheap round-trip flights

Enter your travel dates to find the best prices.

5:55 pm - 8:55 pm

LHR

IAD

8h 00mnonstop

1:32 pm - 6:20 am

IAD

LHR

11h 48m

1 stop

$535Virgin Atlantic

Mon, May 18 - Mon, Jun 1

9:55 am - 3:35 pm

LHR

IAD

10h 40m

1 stop

10:55 pm - 11:20 am

IAD

LHR

7h 25mnonstop

$536Delta

Thu, Apr 30 - Mon, May 4

9:40 am - 4:02 pm

LHR

DCA

11h 22m

1 stop

12:59 pm - 6:45 am

DCA

LHR

12h 46m

1 stop

$536Virgin Atlantic

Fri, May 1 - Fri, May 8

8:15 pm - 10:29 pm

LHR

DCA

31h 14m

2 stops

5:31 pm - 9:40 pm

DCA

LHR

23h 09m

1 stop

$537Finnair

Tue, May 5 - Tue, May 12

2:00 pm - 3:30 pm

LHR

IAD

30h 30m

1 stop

7:15 pm - 7:45 am

IAD

LHR

7h 30mnonstop

$538British Airways

Mon, Mar 30 - Mon, Apr 6

6:15 am - 3:30 pm

LHR

IAD

14h 15m

1 stop

7:15 pm - 7:45 am

IAD

LHR

7h 30mnonstop

$541British Airways

Wed, Apr 15 - Wed, May 6

8:05 am - 10:59 pm

LHR

DCA

18h 54m

1 stop

8:50 pm - 6:55 am

DCA

LHR

30h 05m

1 stop

$559JetBlue

Fri, Mar 13 - Mon, Mar 16

8:05 am - 10:59 pm

LHR

DCA

18h 54m

1 stop

6:00 am - 8:45 pm

DCA

LHR

10h 45m

1 stop

$560JetBlue

Fri, Mar 13 - Mon, Mar 16

7:30 am - 9:43 pm

LHR

BWI

18h 13m

2 stops

3:35 pm - 11:45 am

BWI

LHR

15h 10m

1 stop

$615United Airlines

Thu, Mar 19 - Tue, Mar 31

6:30 am - 9:42 pm

LHR

BWI

19h 12m

2 stops

5:12 pm - 11:15 am

BWI

LHR

14h 03m

1 stop

$616United Airlines

Fri, Mar 13 - Mon, Mar 16

British Airways flights from London Heathrow Airport to Washington, D.C.

Our best British Airways deals on London Heathrow Airport to Washington, D.C. flight tickets

British Airways

Mar 30

LHR2:00 pmLondon Heathrow

30h 30m

1 stop

IAD3:30 pmWashington, D.C. Dulles Intl

Apr 6

IAD7:15 pmWashington, D.C. Dulles Intl

7h 30m

LHR7:45 amLondon Heathrow

$538

British Airways

Apr 15

LHR6:15 amLondon Heathrow

14h 15m

1 stop

IAD3:30 pmWashington, D.C. Dulles Intl

May 6

IAD7:15 pmWashington, D.C. Dulles Intl

7h 30m

LHR7:45 amLondon Heathrow

$541

British Airways

Apr 15

LHR6:15 amLondon Heathrow

14h 15m

1 stop

IAD3:30 pmWashington, D.C. Dulles Intl

May 6

IAD7:15 pmWashington, D.C. Dulles Intl

7h 30m

LHR7:45 amLondon Heathrow

$543

KLM flights from London Heathrow Airport to Washington, D.C.

Our best KLM deals on London Heathrow Airport to Washington, D.C. flight tickets

KLM

May 9

LHR6:30 amLondon Heathrow

14h 05m

1 stop

IAD3:35 pmWashington, D.C. Dulles Intl

May 25

IAD10:55 pmWashington, D.C. Dulles Intl

7h 25m

LHR11:20 amLondon Heathrow

$555

KLM

Apr 30

LHR8:05 pmLondon Heathrow

26h 25m

1 stop

DCA5:30 pmWashington, D.C. Reagan-National

Jun 15

DCA6:05 amWashington, D.C. Reagan-National

9h 05m

1 stop

LHR8:10 pmLondon Heathrow

$568

KLM

May 5

LHR10:45 amLondon Heathrow

13h 14m

1 stop

DCA6:59 pmWashington, D.C. Reagan-National

May 15

DCA6:09 amWashington, D.C. Reagan-National

20h 06m

1 stop

LHR7:15 amLondon Heathrow

$580

momondo Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Mon 5/18

5:55 pm-8:55 pm

Nonstop8h 00m

Washington, D.C. Dulles Intl

Mon 6/1

1:32 pm-6:20 am

1 stop11h 48m

$535

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 4/30

9:55 am-3:35 pm

1 stop10h 40m

Washington, D.C. Dulles Intl

Mon 5/4

10:55 pm-11:20 am

Nonstop7h 25m

$536

LondonWashington, D.C.

LHR - DCA

LHRDCA

London Heathrow

Fri 5/1

9:40 am-4:02 pm

1 stop11h 22m

Washington, D.C. Reagan-National

Fri 5/8

12:59 pm-6:45 am

1 stop12h 46m

$536

LondonWashington, D.C.

LHR - DCA

LHRDCA

London Heathrow

Tue 5/5

8:15 pm-10:29 pm

2 stops31h 14m

Washington, D.C. Reagan-National

Tue 5/12

5:31 pm-9:40 pm

1 stop23h 09m

$537

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Mon 3/30

2:00 pm-3:30 pm

1 stop30h 30m

Washington, D.C. Dulles Intl

Mon 4/6

7:15 pm-7:45 am

Nonstop7h 30m

$538

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Wed 4/15

6:15 am-3:30 pm

1 stop14h 15m

Washington, D.C. Dulles Intl

Wed 5/6

7:15 pm-7:45 am

Nonstop7h 30m

$541

LondonWashington, D.C.

LHR - DCA

LHRDCA

London Heathrow

Fri 3/13

8:05 am-10:59 pm

1 stop18h 54m

Washington, D.C. Reagan-National

Mon 3/16

8:50 pm-6:55 am

1 stop30h 05m

$559

LondonWashington, D.C.

LHR - DCA

LHRDCA

London Heathrow

Fri 3/13

8:05 am-10:59 pm

1 stop18h 54m

Washington, D.C. Reagan-National

Mon 3/16

6:00 am-8:45 pm

1 stop10h 45m

$560

LondonBaltimore

LHR - BWI

LHRBWI

London Heathrow

Thu 3/19

7:30 am-9:43 pm

2 stops18h 13m

Baltimore/Washington

Tue 3/31

3:35 pm-11:45 am

1 stop15h 10m

$615

LondonBaltimore

LHR - BWI

LHRBWI

London Heathrow

Fri 3/13

6:30 am-9:42 pm

2 stops19h 12m

Baltimore/Washington

Mon 3/16

5:12 pm-11:15 am

1 stop14h 03m

$616

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 London Heathrow Airport to Washington, D.C.

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

Layovers

Other information

What is the cheapest month to fly to Washington, D.C.?

The month of January is, on average, the cheapest month to fly to Washington, D.C. from London Heathrow Airport, with most prices found around $613. If you’re not able to fly to Washington, D.C. in January, then September is your next best option. Flight prices from London Heathrow Airport to Washington, D.C. during September average around $637.

What is the cheapest day to depart on your flight to Washington, D.C.?

On average, the least expensive day to fly to Washington, D.C. from London Heathrow Airport is on a Thursday. momondo users have found tickets for Thursday departures for as low as $750. However, this price may fluctuate depending on the airline, the season, and holidays. When flying out on a Tuesday, the most expensive travel day of the week, you can expect to see flight prices from London Heathrow Airport to Washington, D.C. for around $896.

What is the cheapest time of day to depart on your flight to Washington, D.C.?

In the afternoon is the cheapest time of day to fly from London Heathrow Airport to Washington, D.C. when you can find flight prices for as low as $815. Flying to Washington, D.C. in the afternoon is an ideal time because this is during off-peak travel hours. Try not to purchase tickets at noon because they tend to be around $844. Of course, these prices can vary depending on the time of year and what airport you fly to.

What is the cheapest London Heathrow to Washington, D.C. flight route?

Fly from London Heathrow to Washington, D.C. Dulles Intl for the best London Heathrow - Washington, D.C. flight prices

How far in advance should I book a flight to Washington, D.C.?

You are more likely to see cheaper flights to Washington, D.C. from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. for around $747 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. from London Heathrow Airport for as low as $711 on momondo.

What cabin class options are available on London Heathrow to Washington, D.C. flights?

There are 4 cabin classes available to choose from on London Heathrow to Washington, D.C. 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 London Heathrow Airport to Washington, D.C. flights?

You could potentially save up to 13% on your flight if you consider stops on a London Heathrow Airport to Washington, D.C. flight.

How have London Heathrow Airport to Washington, D.C. flight prices changed over time?

As of March 2026, prices for London Heathrow Airport to Washington, D.C. flights are approximately 17% cheaper when compared to flights at the same time last year.

When to book flights from London Heathrow Airport to Washington, D.C.

Are you open to changing your travel dates? Check out the ideal times to fly from London Heathrow Airport to Washington, D.C. according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap London Heathrow Airport to Washington, D.C. (LHR to WAS) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London Heathrow Airport to Washington, D.C.

Best Price Found	$667
Fastest flight time	8h 00m
Direct flights	Every day
Airports in Washington, D.C.	2 airports

The best one-way flight to Washington, D.C. from London Heathrow Airport in the past 72 hours is $667. The best round-trip flight deal from London Heathrow Airport to Washington, D.C. found on momondo in the last 72 hours is $649.

The fastest flight from London Heathrow Airport to Washington, D.C. takes 8h 00m

Direct flights go from London Heathrow Airport to Washington, D.C. every day.

There are 2 airports in Washington, D.C.. From London Heathrow Airport there are direct flights to Washington, D.C. Dulles Intl (IAD).

Search flight deals

How far is London Heathrow to Washington, D.C. by plane?
The distance between London Heathrow and Washington, D.C. is about 3649.4 mi. A reasonable flight in good conditions will take 8h 00m.
When did momondo last update prices for flights from London Heathrow Airport to Washington, D.C.?
Prices for flights from London Heathrow Airport to Washington, D.C. are updated daily.
How many operators does momondo search for flights from London Heathrow Airport to Washington, D.C.?
As of March 2026, there are 12 operators available to choose from for flights from London Heathrow Airport to Washington, D.C..
How old do you have to be to fly from London Heathrow Airport to Washington, D.C.?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from London Heathrow Airport to Washington, D.C..
What documentation or ID do you need to fly to Washington, D.C.?
The necessary travel and health documents for your Washington, D.C. trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from London Heathrow Airport to Washington, D.C.?
momondo data reveals that the most frequently booked plane model on the route from London Heathrow Airport to Washington, D.C. is Boeing 777, representing 34.41% of all bookings. The subsequent popular models are Boeing 787-9 Dreamliner at 17.33%, Boeing 777-300ER at 10.29%, and Airbus A350-1000 at 8.28%.
What is the most popular airline from London Heathrow Airport to Washington, D.C.?
momondo data reveals that the most frequently booked airline on the route from London Heathrow Airport to Washington, D.C. is British Airways, representing 39% of all bookings. The subsequent popular airlines are United Airlines at 14%, American Airlines at 12%, and Delta at 12%.

Best airlines flying from London Heathrow Airport to Washington, D.C.

Compare and see reviews for airlines that fly from London Heathrow Airport to Washington, D.C. with momondo

Airline	Rating	Free Cancellation	Price
Scandinavian Airlines	PriceFrom $271	Free Cancellation	Rating 7.3 1,702 reviews	Search Scandinavian Airlines flights
Delta	PriceFrom $320	Free Cancellation	Rating 7.9 8,242 reviews	Search Delta flights
Austrian Airlines	PriceFrom $431	Free Cancellation	Rating 7.6 900 reviews	Search Austrian Airlines flights
Icelandair	PriceFrom $466	Free Cancellation	Rating 7.1 617 reviews	Search Icelandair flights
TAP AIR PORTUGAL	PriceFrom $473	Free Cancellation	Rating 7.1 2,155 reviews	Search TAP AIR PORTUGAL flights
American Airlines	PriceFrom $559	Free Cancellation	Rating 7.1 11,375 reviews	Search American Airlines flights
Lufthansa	PriceFrom $562	Free Cancellation	Rating 6.8 7,820 reviews	Search Lufthansa flights
United Airlines	PriceFrom $567	Free Cancellation	Rating 7.4 9,378 reviews	Search United Airlines flights
British Airways	PriceFrom $571	Free Cancellation	Rating 6.7 7,773 reviews	Search British Airways flights
Air Canada	PriceFrom $635	Free Cancellation	Rating 7.1 10,770 reviews	Search Air Canada flights

Delta Flights From London Heathrow Airport to Washington, D.C.
Delta flies from London Heathrow Airport to Washington, D.C. around 5 times per week, with 8,242 momondo users rating the airline 7.9/10. The cheapest Delta deal from London Heathrow Airport to Washington, D.C. in the last 72 hours was $320 (round-trip), much lower than the average airfare cost of $949 for Delta flights on this route.
Austrian Airlines Flights From London Heathrow Airport to Washington, D.C.
Across 900 Austrian Airlines reviews on momondo, the average score is 7.6/10. Austrian Airlines flies from London Heathrow Airport to Washington, D.C. about 12 times each week, with ticket deals ranging from $431 to $773. Price data is based on momondo searches in the last 72 hours.

Alexandria

National Harbor

Gettysburg

Arlington

Waldorf

Woodbridge

Colonial Beach

Laurel

Towson

Silver Spring

Gaithersburg

Fredericksburg

Rockville

Tysons

Manassas

Springfield

Bethesda

Fairfax

Linthicum Heights

Reston

Why use momondo?

Why should I use momondo to find a flight deal from London to Washington, D.C.?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from London to Washington, D.C. for you.

Can I find flights from London to Washington, D.C. with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Washington, D.C. from London with this policy.

How can momondo help me find flights from London to Washington, D.C.?

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 Washington, D.C. from London.

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

Yes momondo offers price alerts on flights to Washington, D.C. from London. 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.

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Fly into one of these airports located in Washington, D.C.

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Cheap flights from London Heathrow Airport to Washington, D.C. from $361

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British Airways flights from London Heathrow Airport to Washington, D.C.

Our best British Airways deals on London Heathrow Airport to Washington, D.C. flight tickets

KLM flights from London Heathrow Airport to Washington, D.C.

Our best KLM deals on London Heathrow Airport to Washington, D.C. flight tickets

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

See travel insights to Washington, D.C. from

How to get the cheapest flight ticket from London Heathrow Airport to Washington, D.C.

What is the cheapest month to fly to Washington, D.C.?

What is the cheapest day to depart on your flight to Washington, D.C.?

What is the cheapest time of day to depart on your flight to Washington, D.C.?

What is the cheapest London Heathrow to Washington, D.C. flight route?

How far in advance should I book a flight to Washington, D.C.?

What cabin class options are available on London Heathrow to Washington, D.C. flights?

Can stopping save me money on London Heathrow Airport to Washington, D.C. flights?

How have London Heathrow Airport to Washington, D.C. flight prices changed over time?

What is the cheapest airline that flies from London Heathrow to Washington, D.C.?

What airlines fly to Washington, D.C.?

How often are flights from London to Washington, D.C. delayed?

What is the most punctual flight time for London to Washington, D.C. flights?

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

Which airline has the best punctuality record on London to Washington, D.C. flights?

Which airport is the most popular layover for flights between London Heathrow Airport and Washington, D.C.?

Which layover airport offers the lowest fares from London Heathrow Airport to Washington, D.C.?

Which layover airport has the shortest travel time from London Heathrow Airport to Washington, D.C.?

Which layover airport has the shortest connection time from London Heathrow Airport to Washington, D.C.?

How many flights depart from London Heathrow Airport to Washington, D.C. on average per day?

How many flights depart from London Heathrow Airport to Washington, D.C. on average per week?

When to book flights from London Heathrow Airport to Washington, D.C.

Cheap London Heathrow Airport to Washington, D.C. (LHR to WAS) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London Heathrow Airport to Washington, D.C.

Best Price Found

Fastest flight time

Direct flights

Airports in Washington, D.C.

Best airlines flying from London Heathrow Airport to Washington, D.C.

Compare and see reviews for airlines that fly from London Heathrow Airport to Washington, D.C. with momondo

Delta Flights From London Heathrow Airport to Washington, D.C.

Austrian Airlines Flights From London Heathrow Airport to Washington, D.C.

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Find better results for your trip to the United States

Fly into one of these airports located in Washington, D.C.

Airports listed have a maximum distance of 22.4 mi from Washington, D.C.

Fly your favorite airline to Washington, D.C.

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

Cabin classes currently available on flights to Washington, D.C.

List of cabin classes available on flights landing in Washington, D.C.. Availability may vary depending on flight origin and airline.

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