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

Historically, on average around 18% 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 cheapest airline that flies from London Heathrow to Washington, D.C.?

United Airlines, British Airways, and SWISS are the most popular carriers operating from London Heathrow to Washington, D.C.

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 departing in the morning have, in the past, seen delays more frequently in comparison.

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

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

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

The number of flights available between London Heathrow Airport and Washington, D.C. is 26 per day as of November 2025. The most frequent departure time is 16:00, with 100% of daily flights leaving in the afternoon.

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

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

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

As of November 2025, 186 flights take off from London Heathrow Airport and land in Washington, D.C. each week. The most common flight departure day for this route is Wed, with 17% of weekly flights taking off on this day.

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 refreshed on a daily basis.

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 stopovers. 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 travel and health documents required for your trip to Washington, D.C. can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s licence, and a passport valid for six-months after you plan to arrive at Washington, D.C.. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

€466 Cheap Flights from London Heathrow Airport to Washington, D.C. in 2025/26

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06:30 - 15:35LHR-IAD

14h 05m1 stop

17:05 - 10:10IAD-LHR

12h 05m1 stop

€533British Airways

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Thu, 8 Jan - Thu, 15 Jan

12:05 - 15:35LHR-IAD

8h 30mdirect

16:30 - 08:35IAD-LHR

12h 05m1 stop

€535United Airlines

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Fri, 16 Jan - Sat, 28 Mar

10:25 - 21:17LHR-IAD

15h 52m1 stop

08:20 - 05:55IAD-LHR

16h 35m1 stop

€536United Airlines

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Sun, 18 Jan - Mon, 2 Mar

07:40 - 16:00LHR-IAD

13h 20m1 stop

22:15 - 10:50IAD-LHR

7h 35mdirect

€537Austrian Airlines

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Wed, 17 Dec - Thu, 15 Jan

07:50 - 15:35LHR-IAD

12h 45m1 stop

21:45 - 10:00IAD-LHR

7h 15mdirect

€538British Airways

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Sat, 10 Jan - Thu, 15 Jan

06:35 - 20:05LHR-IAD

18h 30m1 stop

09:00 - 08:30IAD-LHR

18h 30m1 stop

€539United Airlines

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Fri, 12 Dec - Wed, 24 Dec

06:00 - 17:05LHR-IAD

16h 05m1 stop

20:30 - 13:00IAD-LHR

11h 30m1 stop

€540SWISS

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Mon, 15 Dec - Thu, 15 Jan

08:50 - 15:35LHR-IAD

11h 45m1 stop

17:05 - 08:05IAD-LHR

10h 00m1 stop

€541Aer Lingus

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Sat, 10 Jan - Sat, 17 Jan

12:15 - 18:40LHR-BWI

11h 25m1 stop

19:40 - 10:50BWI-LHR

10h 10m1 stop

€545Icelandair

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Sat, 10 Jan - Sat, 17 Jan

12:15 - 18:40LHR-BWI

11h 25m1 stop

19:40 - 19:30BWI-LHR

18h 50m1 stop

€574Icelandair

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Thu, 15 Jan - Mon, 19 Jan

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

8 Jan

LHR06:30London Heathrow

14h 05m

1 stop

IAD15:35Washington, D.C. Dulles Intl

15 Jan

IAD17:05Washington, D.C. Dulles Intl

12h 05m

1 stop

LHR10:10London Heathrow

€533

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British Airways

7 Dec

LHR16:25London Heathrow

8h 30m

IAD19:55Washington, D.C. Dulles Intl

23 Dec

IAD21:00Washington, D.C. Dulles Intl

17h 50m

1 stop

LHR19:50London Heathrow

€537

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British Airways

10 Jan

LHR07:50London Heathrow

12h 45m

1 stop

IAD15:35Washington, D.C. Dulles Intl

14 Jan

IAD18:20Washington, D.C. Dulles Intl

7h 10m

LHR06:30London Heathrow

€538

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United Airlines flights from London Heathrow Airport to Washington, D.C.

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

United Airlines

16 Jan

LHR12:05London Heathrow

8h 30m

IAD15:35Washington, D.C. Dulles Intl

28 Mar

IAD16:30Washington, D.C. Dulles Intl

12h 05m

1 stop

LHR08:35London Heathrow

€535

Find similar

United Airlines

18 Jan

LHR10:25London Heathrow

15h 52m

1 stop

IAD21:17Washington, D.C. Dulles Intl

4 Mar

IAD13:02Washington, D.C. Dulles Intl

11h 53m

1 stop

LHR05:55London Heathrow

€536

Find similar

United Airlines

12 Dec

LHR06:35London Heathrow

18h 30m

1 stop

IAD20:05Washington, D.C. Dulles Intl

24 Dec

IAD09:00Washington, D.C. Dulles Intl

18h 30m

1 stop

LHR08:30London Heathrow

€539

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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.

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Route

Depart

Return

Price

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 8/1

06:30-15:35

1 stop14h 05m

Washington, D.C. Dulles Intl

Thu 15/1

17:05-10:10

1 stop12h 05m

€533

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 16/1

12:05-15:35

Nonstop8h 30m

Washington, D.C. Dulles Intl

Sat 28/3

16:30-08:35

1 stop12h 05m

€535

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Sun 18/1

10:25-21:17

1 stop15h 52m

Washington, D.C. Dulles Intl

Mon 2/3

08:20-05:55

1 stop16h 35m

€536

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Wed 17/12

07:40-16:00

1 stop13h 20m

Washington, D.C. Dulles Intl

Thu 15/1

22:15-10:50

Nonstop7h 35m

€537

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Sat 10/1

07:50-15:35

1 stop12h 45m

Washington, D.C. Dulles Intl

Thu 15/1

21:45-10:00

Nonstop7h 15m

€538

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 12/12

06:35-20:05

1 stop18h 30m

Washington, D.C. Dulles Intl

Wed 24/12

09:00-08:30

1 stop18h 30m

€539

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Mon 15/12

06:00-17:05

1 stop16h 05m

Washington, D.C. Dulles Intl

Thu 15/1

20:30-13:00

1 stop11h 30m

€540

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Sat 10/1

08:50-15:35

1 stop11h 45m

Washington, D.C. Dulles Intl

Sat 17/1

17:05-08:05

1 stop10h 00m

€541

LondonBaltimore

LHR - BWI

LHRBWI

London Heathrow

Sat 10/1

12:15-18:40

1 stop11h 25m

Baltimore/Washington

Sat 17/1

19:40-10:50

1 stop10h 10m

€545

LondonBaltimore

LHR - BWI

LHRBWI

London Heathrow

Thu 15/1

12:15-18:40

1 stop11h 25m

Baltimore/Washington

Mon 19/1

19:40-19:30

1 stop18h 50m

€574

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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

Other information

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

The cheapest month to fly to Washington, D.C. from London Heathrow Airport is in September. Flight prices, which tend to average around €559, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of September, then book flights to Washington, D.C. from London Heathrow Airport during November instead. Flights to Washington, D.C. in November, while not as cheap as those in September, still average around €598.

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 €667 when searching weeks before you fly. 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 €598 on momondo.

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

There is only 1 cabin class 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.

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

As of November 2025, prices for London Heathrow Airport to Washington, D.C. flights are approximately 46% more expensive 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 return 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.

Fastest flight time	8h 10m
Direct flights	Every day
Airports in Washington, D.C.	2 airports

The fastest flight from London Heathrow Airport to Washington, D.C. takes 8h 10m

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

There are 2 airports near Washington, D.C.: Baltimore/Washington (BWI), Washington, D.C. Dulles Intl (IAD)

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How far is London Heathrow to Washington, D.C. by plane?
Washington, D.C. is 5873.1 km away from London Heathrow. A reasonable flight in good conditions will take 8h 15m.
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 refreshed on a daily basis.
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 stopovers. 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 travel and health documents required for your trip to Washington, D.C. can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s licence, and a passport valid for six-months after you plan to arrive at Washington, D.C.. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular plane model from London Heathrow Airport to Washington, D.C.?
Based on momondo bookings for flights between London Heathrow Airport and Washington, D.C., the leading plane model is Boeing 777, making up 31.59% of the total bookings. Other popular models include Airbus A330-300 with 10.95%, Boeing 787-9 Dreamliner with 10.15%, and Boeing 787-8 Dreamliner with 7.78%.

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from London to Washington, D.C.. momondo saves you time and could save you money on your trip.

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

Yes. momondo allows you to filter the results for London to Washington, D.C. flights to just show those with flexible booking policies.

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?

If you are not ready to book a flight from London to Washington, D.C. now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Washington, D.C. and let you know when they change.

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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.

Washington, D.C. Reagan-National Airport

Washington, D.C. Dulles Intl Airport

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Cheap flights from London Heathrow Airport to Washington, D.C. from €466

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

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

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United Airlines flights from London Heathrow Airport to Washington, D.C.

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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.

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 Washington, D.C.?

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.?

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

There is only 1 cabin class 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.

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

As of November 2025, prices for London Heathrow Airport to Washington, D.C. flights are approximately 46% more expensive when compared to flights at the same time last year.

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

United Airlines, British Airways, and SWISS are the most popular carriers operating from London Heathrow to Washington, D.C.

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

Historically, on average around 18% 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 departing 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?

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

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

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

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

The number of flights available between London Heathrow Airport and Washington, D.C. is 26 per day as of November 2025. The most frequent departure time is 16:00, with 100% of daily flights leaving in the afternoon.

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

As of November 2025, 186 flights take off from London Heathrow Airport and land in Washington, D.C. each week. The most common flight departure day for this route is Wed, with 17% of weekly flights taking off on this day.

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.

Fastest flight time

Direct flights

Airports in Washington, D.C.

How far is London Heathrow to Washington, D.C. by plane?

When did momondo last update prices 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.?

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

What is the most popular plane model from London Heathrow Airport to Washington, D.C.?

Travelling to a place near Washington, D.C.?

Why use momondo?

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

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

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

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

An easier way to manage your Washington, D.C. trip

We make it super easy to schedule, organise 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 the United States

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

Airports listed have a maximum distance of 36.1 km from Washington, D.C.