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

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?

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 40% 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 many operators does momondo search for flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

As of September 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.

£196 Cheap Flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in 2025

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

As of September 2025, 189 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 15% of weekly flights taking off on this day.

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

As of September 2025, there are 27 flights per day flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport. The most common time of day flights depart is 22:00, with 78% of flights taking off in the evening.

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

Round-trip

One-way

Last minute

Direct

Cheap return flights

20:30 - 20:20IAD-LHR

18h 50m1 stop

13:05 - 22:10LHR-IAD

14h 05m1 stop

£363Icelandair

Find Deal

Wed, 8 Oct - Wed, 15 Oct

20:30 - 11:55IAD-LHR

10h 25m1 stop

21:25 - 19:20LHR-IAD

26h 55m1 stop

£363Icelandair

Find Deal

Wed, 1 Oct - Thu, 9 Oct

20:30 - 11:55IAD-LHR

10h 25m1 stop

21:25 - 19:20LHR-IAD

26h 55m1 stop

£364Icelandair

Find Deal

Mon, 13 Oct - Thu, 23 Oct

20:30 - 11:55IAD-LHR

10h 25m1 stop

21:25 - 19:20LHR-IAD

26h 55m1 stop

£365Icelandair

Find Deal

Sat, 4 Oct - Wed, 15 Oct

19:40 - 19:30IAD-LHR

18h 50m1 stop

12:15 - 18:30LHR-IAD

11h 15m1 stop

£365Icelandair

Find Deal

Wed, 19 Nov - Mon, 24 Nov

22:20 - 22:55IAD-LHR

19h 35m1 stop

18:30 - 15:15LHR-IAD

25h 45m1 stop

£372TAP AIR PORTUGAL

Find Deal

Tue, 23 Sep - Wed, 19 Nov

17:45 - 10:20IAD-LHR

11h 35m1 stop

06:00 - 15:15LHR-IAD

14h 15m1 stop

£378TAP AIR PORTUGAL

Find Deal

Mon, 22 Sep - Thu, 11 Dec

22:05 - 17:00IAD-LHR

37h 55m2 stops

07:05 - 19:59LHR-IAD

17h 54m2 stops

£382Scandinavian Airlines

Find Deal

Sat, 4 Oct - Tue, 7 Oct

22:05 - 17:00IAD-LHR

37h 55m2 stops

06:40 - 19:59LHR-IAD

18h 19m1 stop

£384Scandinavian Airlines

Find Deal

Sat, 4 Oct - Tue, 7 Oct

09:35 - 06:30IAD-LHR

15h 55m1 stop

17:10 - 16:15LHR-IAD

28h 05m1 stop

£401

Find Deal

Wed, 1 Oct - Thu, 9 Oct

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

8 Oct

IAD20:30Washington, D.C. Dulles Intl

18h 50m

1 stop

LHR20:20London Heathrow

15 Oct

LHR13:05London Heathrow

14h 05m

1 stop

IAD22:10Washington, D.C. Dulles Intl

£362

Find similar

Icelandair

1 Oct

IAD20:30Washington, D.C. Dulles Intl

10h 25m

1 stop

LHR11:55London Heathrow

9 Oct

LHR21:25London Heathrow

26h 55m

1 stop

IAD19:20Washington, D.C. Dulles Intl

£363

Find similar

Icelandair

13 Oct

IAD20:30Washington, D.C. Dulles Intl

10h 25m

1 stop

LHR11:55London Heathrow

23 Oct

LHR21:25London Heathrow

26h 55m

1 stop

IAD19:20Washington, D.C. Dulles Intl

£364

Find similar

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

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

SWISS

24 Sept

IAD20:45Washington, D.C. Dulles Intl

14h 40m

1 stop

LHR16:25London Heathrow

3 Oct

LHR08:40London Heathrow

12h 35m

1 stop

IAD16:15Washington, D.C. Dulles Intl

£418

Find similar

SWISS

22 Sept

IAD20:45Washington, D.C. Dulles Intl

11h 15m

1 stop

LHR13:00London Heathrow

10 Oct

LHR08:40London Heathrow

12h 35m

1 stop

IAD16:15Washington, D.C. Dulles Intl

£427

Find similar

SWISS

24 Sept

IAD20:45Washington, D.C. Dulles Intl

14h 40m

1 stop

LHR16:25London Heathrow

3 Oct

LHR08:40London Heathrow

12h 35m

1 stop

IAD16:15Washington, D.C. Dulles Intl

£430

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.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 8/10

20:30-20:20

1 stop18h 50m

London Heathrow

Wed 15/10

13:05-22:10

1 stop14h 05m

£362

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 1/10

20:30-11:55

1 stop10h 25m

London Heathrow

Thu 9/10

21:25-19:20

1 stop26h 55m

£363

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mon 13/10

20:30-11:55

1 stop10h 25m

London Heathrow

Thu 23/10

21:25-19:20

1 stop26h 55m

£364

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sat 4/10

20:30-11:55

1 stop10h 25m

London Heathrow

Wed 15/10

21:25-19:20

1 stop26h 55m

£365

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 19/11

19:40-19:30

1 stop18h 50m

London Heathrow

Mon 24/11

12:15-18:30

1 stop11h 15m

£365

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Tue 23/9

22:20-22:55

1 stop19h 35m

London Heathrow

Wed 19/11

18:30-15:15

1 stop25h 45m

£372

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mon 22/9

17:45-10:20

1 stop11h 35m

London Heathrow

Thu 11/12

06:00-15:15

1 stop14h 15m

£378

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sat 4/10

22:05-17:00

2 stops37h 55m

London Heathrow

Tue 7/10

07:05-19:59

2 stops17h 54m

£382

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sat 4/10

22:05-17:00

2 stops37h 55m

London Heathrow

Tue 7/10

06:40-19:59

1 stop18h 19m

£384

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 1/10

09:35-06:30

1 stop15h 55m

London Heathrow

Thu 9/10

17:10-16:15

1 stop28h 05m

£401

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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

Other information

What is the cheapest month to fly to London Heathrow Airport?

In general, September 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 £497. The month of October is another great option to travel to London Heathrow Airport, with average flight prices from Washington, D.C. Dulles Intl Airport averaging around £502.

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 £520. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Sunday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Sunday is £619.

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 £563. 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 £578 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 £558 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 £512 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 September 2025, prices for Washington, D.C. Dulles Intl Airport to London Heathrow Airport flights are approximately 19% 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	£313
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 £313. 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 £478.

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 10h 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 September 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 39.44% of the total bookings. Other popular models include Airbus A380-800 with 14.30%, Boeing 787-8 Dreamliner with 9.34%, and Airbus A380 with 6.29%.
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 32% of all bookings. The subsequent popular airlines are Virgin Atlantic at 26%, United Airlines at 11%, and Iberia at 11%.

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 £306	Free Cancellation	Rating 6.8 7,409 reviews	Search Lufthansa flights
Icelandair	PriceFrom £365	Free Cancellation	Rating 7.0 546 reviews	Search Icelandair flights
Virgin Atlantic	PriceFrom £374	Free Cancellation	Rating 7.4 664 reviews	Search Virgin Atlantic flights
British Airways	PriceFrom £382	Free Cancellation	Rating 6.6 7,361 reviews	Search British Airways flights
Air France	PriceFrom £393	Free Cancellation	Rating 7.4 1,469 reviews	Search Air France flights
Iberia	PriceFrom £452	Free Cancellation	Rating 7.0 2,929 reviews	Search Iberia flights
KLM	PriceFrom £455	Free Cancellation	Rating 7.8 1,385 reviews	Search KLM flights
United Airlines	PriceFrom £518	Free Cancellation	Rating 7.4 8,937 reviews	Search United Airlines flights

KLM Flights From Washington, D.C. Dulles Intl Airport to London Heathrow Airport
KLM operates around 7 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 £795, but momondo users have found KLM deals from Washington, D.C. Dulles Intl Airport to London Heathrow Airport from as low as £616 round-trip. KLM has been scored 7.8/10 in 1,385 reviews.
Virgin Atlantic Flights From Washington, D.C. Dulles Intl Airport to London Heathrow Airport
£507 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 £821, however, with flight time and availability significantly affecting the price. Virgin Atlantic (7.4/10 from 664 user reviews) flies into London Heathrow Airport from Washington, D.C. Dulles Intl Airport 7 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.

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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 £196

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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

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

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

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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 September 2025, prices for Washington, D.C. Dulles Intl Airport to London Heathrow Airport flights are approximately 19% 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?

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

As of September 2025, there are 27 flights per day flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport. The most common time of day flights depart is 22:00, with 78% 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 September 2025, 189 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 15% 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

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