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. Saturday has historically seen more delays on average compared to the rest of the week.

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

Scandinavian Airlines, TAP AIR PORTUGAL, and Icelandair are the most popular carriers operating from Washington, D.C. Dulles Intl to London Heathrow

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

According to our data, Aeromexico have had the fewest delays on this route over the last 12 months, with no flights being classified as delayed.

Which airlines fly to London Heathrow Airport?

British Airways, Virgin Atlantic and United Airlines are the top three most popular airlines that fly to London Heathrow Airport from Washington, D.C. Dulles Intl Airport according to our data. British Airways is the first choice among our users, with 41% of people opting to fly with this airline when travelling to London Heathrow Airport. Keep in mind that there are 8 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.

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

Historically, on average around 22% of flights between Washington, D.C. and London have experienced a delay on any given week. The average delay length over the past 12 months has been 162 minutes.

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

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

As of October 2025, there are 8 operators available to choose from for flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport.

What documentation or ID do you need to fly to London Heathrow Airport?

The travel and health documents required for your trip to London Heathrow Airport 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 license, and a passport valid for six-months after you plan to arrive at London Heathrow Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

£189 Cheap Flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in 2025/26

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

As of October 2025, there are 22 flights per day flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport. The most common time of day flights depart is 19:00, with 100% of flights taking off in the evening.

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One-way

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20:30 - 11:55IAD-LHR

10h 25m1 stop

21:25 - 19:20LHR-IAD

26h 55m1 stop

£424Icelandair

Find Deal

Sun, 29 Mar - Sat, 4 Apr

17:05 - 08:05IAD-LHR

10h 00m1 stop

12:10 - 19:30LHR-IAD

12h 20m1 stop

£425Aer Lingus

Find Deal

Tue, 9 Dec - Thu, 18 Dec

12:30 - 09:20IAD-LHR

16h 50m2 stops

06:40 - 18:15LHR-IAD

15h 35m1 stop

£426Scandinavian Airlines

Find Deal

Fri, 13 Mar - Thu, 19 Mar

12:23 - 09:20IAD-LHR

15h 57m2 stops

21:05 - 18:50LHR-IAD

26h 45m2 stops

£426Scandinavian Airlines

Find Deal

Fri, 6 Feb - Fri, 13 Feb

19:40 - 10:50IAD-LHR

10h 10m1 stop

12:15 - 18:30LHR-IAD

11h 15m1 stop

£427Icelandair

Find Deal

Sat, 10 Jan - Mon, 19 Jan

22:20 - 10:50IAD-LHR

7h 30mdirect

16:50 - 20:30LHR-IAD

8h 40mdirect

£428Virgin Atlantic

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Sun, 9 Nov - Tue, 18 Nov

22:20 - 10:50IAD-LHR

7h 30mdirect

16:50 - 20:30LHR-IAD

8h 40mdirect

£433Virgin Atlantic

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Mon, 1 Dec - Tue, 9 Dec

18:20 - 06:30IAD-LHR

7h 10mdirect

16:25 - 19:55LHR-IAD

8h 30mdirect

£438British Airways

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Wed, 3 Dec - Fri, 12 Dec

18:20 - 06:30IAD-LHR

7h 10mdirect

12:10 - 15:35LHR-IAD

8h 25mdirect

£443British Airways

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Mon, 17 Nov - Wed, 26 Nov

22:15 - 10:50IAD-LHR

7h 35mdirect

06:35 - 15:35LHR-IAD

14h 00m1 stop

£457United Airlines

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Wed, 12 Nov - Wed, 19 Nov

Icelandair flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

Our best Icelandair deals on Washington, D.C. Dulles Intl Airport to London Heathrow Airport flight tickets

Icelandair

29 Mar

IAD20:30Washington, D.C. Dulles Intl

10h 25m

1 stop

LHR11:55London Heathrow

4 Apr

LHR21:25London Heathrow

26h 55m

1 stop

IAD19:20Washington, D.C. Dulles Intl

£424

Find similar

Icelandair

10 Nov

IAD19:40Washington, D.C. Dulles Intl

10h 10m

1 stop

LHR10:50London Heathrow

17 Nov

LHR20:35London Heathrow

26h 55m

1 stop

IAD18:30Washington, D.C. Dulles Intl

£425

Find similar

Icelandair

10 Jan

IAD19:40Washington, D.C. Dulles Intl

10h 10m

1 stop

LHR10:50London Heathrow

19 Jan

LHR12:15London Heathrow

11h 15m

1 stop

IAD18:30Washington, D.C. Dulles Intl

£427

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Aer Lingus flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

Our best Aer Lingus deals on Washington, D.C. Dulles Intl Airport to London Heathrow Airport flight tickets

Aer Lingus

9 Dec

IAD17:05Washington, D.C. Dulles Intl

10h 00m

1 stop

LHR08:05London Heathrow

18 Dec

LHR12:10London Heathrow

12h 20m

1 stop

IAD19:30Washington, D.C. Dulles Intl

£425

Find similar

Aer Lingus

14 Jan

IAD17:05Washington, D.C. Dulles Intl

10h 00m

1 stop

LHR08:05London Heathrow

16 Jan

LHR08:50London Heathrow

11h 45m

1 stop

IAD15:35Washington, D.C. Dulles Intl

£431

Find similar

Aer Lingus

31 Oct

IAD18:05Washington, D.C. Dulles Intl

10h 00m

1 stop

LHR08:05London Heathrow

7 Nov

LHR08:50London Heathrow

11h 45m

1 stop

IAD15:35Washington, D.C. Dulles Intl

£456

Find similar

momondo Fare Finder

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

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Fly to

Route

Depart

Return

Price

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 29/3

20:30-11:55

1 stop10h 25m

London Heathrow

Sat 4/4

21:25-19:20

1 stop26h 55m

£424

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Tue 9/12

17:05-08:05

1 stop10h 00m

London Heathrow

Thu 18/12

12:10-19:30

1 stop12h 20m

£425

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Fri 13/3

12:30-09:20

2 stops16h 50m

London Heathrow

Thu 19/3

06:40-18:15

1 stop15h 35m

£426

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Fri 6/2

12:23-09:20

2 stops15h 57m

London Heathrow

Fri 13/2

21:05-18:50

2 stops26h 45m

£426

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sat 10/1

19:40-10:50

1 stop10h 10m

London Heathrow

Mon 19/1

12:15-18:30

1 stop11h 15m

£427

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 9/11

22:20-10:50

Nonstop7h 30m

London Heathrow

Tue 18/11

16:50-20:30

Nonstop8h 40m

£428

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mon 1/12

22:20-10:50

Nonstop7h 30m

London Heathrow

Tue 9/12

16:50-20:30

Nonstop8h 40m

£433

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 3/12

18:20-06:30

Nonstop7h 10m

London Heathrow

Fri 12/12

16:25-19:55

Nonstop8h 30m

£438

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mon 17/11

18:20-06:30

Nonstop7h 10m

London Heathrow

Wed 26/11

12:10-15:35

Nonstop8h 25m

£443

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 12/11

22:15-10:50

Nonstop7h 35m

London Heathrow

Wed 19/11

06:35-15:35

1 stop14h 00m

£457

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Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Washington, D.C. Dulles Intl Airport 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?

In general, August is the cheapest month to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £507. The month of September is another great option to travel to London Heathrow Airport, with average flight prices from Washington, D.C. Dulles Intl Airport averaging around £512.

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

On average, the least expensive day to fly to London Heathrow Airport from Washington, D.C. Dulles Intl Airport is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as £533. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Saturday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Saturday is £648.

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 Washington, D.C. Dulles Intl Airport to London Heathrow Airport in the evening for as low as £583. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are £591 on average. Flights to London Heathrow Airport from Washington, D.C. Dulles Intl Airport in the afternoon are generally more expensive because this time of day is more convenient for travellers’ schedules.

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

Fly from Washington, D.C. Dulles Intl to London Heathrow for the best Washington, D.C. Dulles 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 Washington, D.C. Dulles Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £574 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London Heathrow Airport from Washington, D.C. Dulles Intl Airport for as low as £533 on momondo.

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

There are 4 cabin classes available to choose from on Washington, D.C. Dulles 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.

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

As of October 2025, prices for Washington, D.C. Dulles Intl Airport to London Heathrow Airport flights are approximately 7% more expensive when compared to flights at the same time last year.

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

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

Estimated return price

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

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

Best price found	£289
Fastest flight time	7h 10m
Direct flights	Every day

The best one-way flight to London Heathrow Airport from Washington, D.C. Dulles Intl Airport in the past 72 hours is £289. The best return flight deal from Washington, D.C. Dulles Intl Airport to London Heathrow Airport found on momondo in the last 72 hours is £518.

The fastest flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport takes 7h 10m

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

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How far is Washington, D.C. Dulles Intl to London Heathrow by plane?
London Heathrow is 3664.4 mi away from Washington, D.C. Dulles Intl. In terms of flight time, this usually takes a little over 7h 10m.
When did momondo last update prices for flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
Prices for flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
As of October 2025, there are 8 operators available to choose from for flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport.
How old do you have to be to fly from Washington, D.C. Dulles 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 Washington, D.C. Dulles Intl Airport to London Heathrow Airport.
What documentation or ID do you need to fly to London Heathrow Airport?
The travel and health documents required for your trip to London Heathrow Airport 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 license, and a passport valid for six-months after you plan to arrive at London Heathrow Airport. 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 Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
Based on momondo bookings for flights between Washington, D.C. Dulles Intl Airport and London Heathrow Airport, the leading plane model is Boeing 777, making up 41.53% of the total bookings. Other popular models include Airbus A380-800 with 10.36%, Airbus A350-1000 with 9.88%, and Boeing 787-8 Dreamliner with 8.05%.
What is the most popular airline from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
momondo data reveals that the most frequently booked airline on the route from Washington, D.C. Dulles Intl Airport to London Heathrow Airport is British Airways, representing 33% of all bookings. The subsequent popular airlines are Virgin Atlantic at 27%, United Airlines at 12%, and Iberia at 9%.

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

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

Airline	Rating	Free Cancellation	Price
Lufthansa	PriceFrom £313	Free Cancellation	Rating 6.8 7,540 reviews	Search Lufthansa flights
Icelandair	PriceFrom £373	Free Cancellation	Rating 7.1 562 reviews	Search Icelandair flights
Virgin Atlantic	PriceFrom £387	Free Cancellation	Rating 7.5 670 reviews	Search Virgin Atlantic flights
British Airways	PriceFrom £391	Free Cancellation	Rating 6.7 7,487 reviews	Search British Airways flights
Air France	PriceFrom £403	Free Cancellation	Rating 7.4 1,482 reviews	Search Air France flights
Iberia	PriceFrom £464	Free Cancellation	Rating 7.0 3,001 reviews	Search Iberia flights
KLM	PriceFrom £512	Free Cancellation	Rating 7.7 1,406 reviews	Search KLM flights
United Airlines	PriceFrom £531	Free Cancellation	Rating 7.4 9,001 reviews	Search United Airlines flights

KLM Flights From Washington, D.C. Dulles Intl Airport to London Heathrow Airport
KLM operates around 4 flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport every week. The average price of these flights found in the last 72 hours has been £658, but momondo users have found KLM deals from Washington, D.C. Dulles Intl Airport to London Heathrow Airport from as low as £512 round-trip. KLM has been scored 7.7/10 in 1,406 reviews.
Virgin Atlantic Flights From Washington, D.C. Dulles Intl Airport to London Heathrow Airport
£387 is the best Virgin Atlantic flight deal from Washington, D.C. Dulles Intl Airport to London Heathrow Airport found on momondo over the last 72 hours. The average Virgin Atlantic ticket price found was closer to £643, however, with flight time and availability significantly affecting the price. Virgin Atlantic (7.5/10 from 670 user reviews) flies into London Heathrow Airport from Washington, D.C. Dulles Intl Airport 4 times in an average week so prices can vary.

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

Flights from Washington, D.C. 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, D.C. to London?

Once you have performed a search for Washington, D.C. to London flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

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

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Cheap flights from Washington, D.C. Dulles Intl Airport to London from £189

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Icelandair flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

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How to get the cheapest flight ticket from Washington, D.C. Dulles Intl Airport 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?

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

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

Fly from Washington, D.C. Dulles Intl to London Heathrow for the best Washington, D.C. Dulles 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 Washington, D.C. Dulles Intl to London Heathrow flights?

There are 4 cabin classes available to choose from on Washington, D.C. Dulles 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.

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

As of October 2025, prices for Washington, D.C. Dulles Intl Airport to London Heathrow Airport flights are approximately 7% more expensive when compared to flights at the same time last year.

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

Scandinavian Airlines, TAP AIR PORTUGAL, and Icelandair are the most popular carriers operating from Washington, D.C. Dulles Intl to London Heathrow

Which airlines fly to London Heathrow Airport?

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

Historically, on average around 22% of flights between Washington, D.C. and London have experienced a delay on any given week. The average delay length over the past 12 months has been 162 minutes.

What is the most punctual flight time for Washington, D.C. to London 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. Saturday has historically seen more delays on average compared to the rest of the week.

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

According to our data, Aeromexico have had the fewest delays on this route over the last 12 months, with no flights being classified as delayed.

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

As of October 2025, there are 22 flights per day flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport. The most common time of day flights depart is 19:00, with 100% of flights taking off in the evening.

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

As of October 2025, 156 flights take off from Washington, D.C. Dulles Intl Airport and land in London Heathrow Airport each week. The most common flight departure day for this route is Mon, with 17% of weekly flights taking off on this day.

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

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

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

Best price found

Fastest flight time

Direct flights

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

When did momondo last update prices for flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

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

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

What is the most popular airline from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

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

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

KLM Flights From Washington, D.C. Dulles Intl Airport to London Heathrow Airport

Virgin Atlantic Flights From Washington, D.C. Dulles Intl Airport to London Heathrow Airport

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Why use momondo?

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

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

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

I’m not ready to book a flight from Washington, D.C. 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, 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 London

Popular Cities in the United Kingdom

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