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

According to our data, Virgin Atlantic have had the least number of delays on this route over the last 12 months; with about 15% of their flights experiencing any sort of delay.

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

Zurich (ZRH) has the shortest average layover time for this route: 1h 23m.

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

Flights connecting via Dublin (DUB) have the shortest average one-way travel time: 9h 39m.

What airlines fly to London Heathrow Airport?

British Airways, United Airlines and American 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 52% of people opting to fly with this airline when traveling to London Heathrow Airport. Keep in mind that there are 16 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 most punctual flight time for Washington, D.C. to London flights?

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

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

Historically, on average around 19% 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 170 minutes.

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

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

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

Flights via Lisbon (LIS) offer the lowest average round-trip price of $520.

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

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

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

Reykjavik (KEF) was the most common stop: 36% of momondo users choosing 1-stop flights on this route connected there.

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

As of May 2026, there are 16 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 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.

$426 Cheap Flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in 2026

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

27 flights are operational daily from Washington, D.C. Dulles Intl Airport to London Heathrow Airport as of May 2026. The most popular departure time for this route is 10:00PM, with 82% of flights per day taking off in the evening.

Q: What is the typical price of a round-trip flight between Washington, D.C. Dulles Intl Airport and London Heathrow Airport?

Prices are currently low for flights on this route. Typical prices usually range from $1,090 to $758. The lowest price recently found on this route was $803.

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

As of May 2026, 192 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.

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

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Enter your travel dates to find the best prices.

8:30 pm - 11:55 am

IAD

LHR

10h 25m

1 stop

9:25 pm - 7:20 pm

LHR

IAD

26h 55m

1 stop

$803Icelandair

Wed, Jul 22 - Wed, Aug 19

8:20 pm - 6:30 pm

IAD

LHR

17h 10m

1 stop

6:40 am - 5:00 pm

LHR

IAD

15h 20m

2 stops

$804Scandinavian Airlines

Wed, Sep 16 - Fri, Sep 25

11:20 pm - 11:55 am

IAD

LHR

31h 35m

1 stop

9:25 pm - 10:15 pm

LHR

IAD

29h 50m

1 stop

$805Icelandair

Fri, Aug 28 - Mon, Sep 14

8:30 pm - 11:55 am

IAD

LHR

10h 25m

1 stop

1:05 pm - 7:20 pm

LHR

IAD

11h 15m

1 stop

$806Icelandair

Fri, Aug 28 - Wed, Sep 2

8:30 pm - 11:55 am

IAD

LHR

10h 25m

1 stop

1:05 pm - 7:20 pm

LHR

IAD

11h 15m

1 stop

$807Icelandair

Mon, Jul 27 - Sun, Sep 6

8:30 pm - 11:55 am

IAD

LHR

10h 25m

1 stop

9:25 pm - 7:20 pm

LHR

IAD

26h 55m

1 stop

$808Icelandair

Fri, Aug 28 - Mon, Sep 14

11:20 pm - 11:55 am

IAD

LHR

31h 35m

1 stop

1:05 pm - 7:20 pm

LHR

IAD

11h 15m

1 stop

$809Icelandair

Fri, Jul 31 - Fri, Sep 11

8:30 pm - 8:20 pm

IAD

LHR

18h 50m

1 stop

1:05 pm - 7:20 pm

LHR

IAD

11h 15m

1 stop

$810Icelandair

Wed, Aug 26 - Sun, Sep 6

10:35 pm - 5:45 pm

IAD

LHR

14h 10m

1 stop

6:00 am - 3:10 pm

LHR

IAD

14h 10m

1 stop

$811TAP AIR PORTUGAL

Wed, Aug 12 - Wed, Aug 26

5:45 pm - 10:20 am

IAD

LHR

11h 35m

1 stop

8:00 am - 8:35 pm

LHR

IAD

17h 35m

1 stop

$812TAP AIR PORTUGAL

Wed, Aug 12 - Tue, Sep 1

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

Jul 22

IAD8:30 pmWashington, D.C. Dulles Intl

10h 25m

1 stop

LHR11:55 amLondon Heathrow

Aug 19

LHR9:25 pmLondon Heathrow

26h 55m

1 stop

IAD7:20 pmWashington, D.C. Dulles Intl

$803

Icelandair

Aug 28

IAD11:20 pmWashington, D.C. Dulles Intl

31h 35m

1 stop

LHR11:55 amLondon Heathrow

Sep 14

LHR9:25 pmLondon Heathrow

29h 50m

1 stop

IAD10:15 pmWashington, D.C. Dulles Intl

$805

Icelandair

Aug 28

IAD8:30 pmWashington, D.C. Dulles Intl

10h 25m

1 stop

LHR11:55 amLondon Heathrow

Sep 2

LHR1:05 pmLondon Heathrow

11h 15m

1 stop

IAD7:20 pmWashington, D.C. Dulles Intl

$806

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

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

Scandinavian Airlines

Sep 16

IAD8:20 pmWashington, D.C. Dulles Intl

17h 10m

1 stop

LHR6:30 pmLondon Heathrow

Sep 25

LHR6:40 amLondon Heathrow

15h 20m

2 stops

IAD5:00 pmWashington, D.C. Dulles Intl

$804

Scandinavian Airlines

Sep 10

IAD8:20 pmWashington, D.C. Dulles Intl

16h 20m

1 stop

LHR5:40 pmLondon Heathrow

Sep 16

LHR6:40 pmLondon Heathrow

27h 20m

1 stop

IAD5:00 pmWashington, D.C. Dulles Intl

$813

Scandinavian Airlines

Sep 30

IAD8:20 pmWashington, D.C. Dulles Intl

14h 40m

1 stop

LHR4:00 pmLondon Heathrow

Oct 6

LHR5:30 pmLondon Heathrow

28h 30m

2 stops

IAD5:00 pmWashington, D.C. Dulles Intl

$814

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

Cheapest round-trip

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 7/22

8:30 pm-11:55 am

1 stop10h 25m

London Heathrow

Wed 8/19

9:25 pm-7:20 pm

1 stop26h 55m

$803

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 9/16

8:20 pm-6:30 pm

1 stop17h 10m

London Heathrow

Fri 9/25

6:40 am-5:00 pm

2 stops15h 20m

$804

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Fri 8/28

11:20 pm-11:55 am

1 stop31h 35m

London Heathrow

Mon 9/14

9:25 pm-10:15 pm

1 stop29h 50m

$805

Quickest round-trip

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Fri 8/28

8:30 pm-11:55 am

1 stop10h 25m

London Heathrow

Wed 9/2

1:05 pm-7:20 pm

1 stop11h 15m

$806

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mon 7/27

8:30 pm-11:55 am

1 stop10h 25m

London Heathrow

Sun 9/6

1:05 pm-7:20 pm

1 stop11h 15m

$807

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Fri 8/28

8:30 pm-11:55 am

1 stop10h 25m

London Heathrow

Mon 9/14

9:25 pm-7:20 pm

1 stop26h 55m

$808

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Fri 7/31

11:20 pm-11:55 am

1 stop31h 35m

London Heathrow

Fri 9/11

1:05 pm-7:20 pm

1 stop11h 15m

$809

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 8/26

8:30 pm-8:20 pm

1 stop18h 50m

London Heathrow

Sun 9/6

1:05 pm-7:20 pm

1 stop11h 15m

$810

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 8/12

10:35 pm-5:45 pm

1 stop14h 10m

London Heathrow

Wed 8/26

6:00 am-3:10 pm

1 stop14h 10m

$811

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 8/12

5:45 pm-10:20 am

1 stop11h 35m

London Heathrow

Tue 9/1

8:00 am-8:35 pm

1 stop17h 35m

$812

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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

Layovers

Other information

What is the typical price of a round-trip flight between Washington, D.C. Dulles Intl Airport and London Heathrow Airport?

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

The month of August is, on average, the cheapest month to fly to London Heathrow Airport from Washington, D.C. Dulles Intl Airport, with most prices found around $681. If you’re not able to fly to London Heathrow Airport in August, then November is your next best option. Flight prices from Washington, D.C. Dulles Intl Airport to London Heathrow Airport during November average around $686.

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

Our data shows that Wednesday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $776. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $907.

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 afternoon. momondo users have found flights departing from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in the afternoon for as low as $819. 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 evening are often more expensive with an average ticket price of $864.

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 from Washington, D.C. Dulles Intl Airport 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 $801 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 Washington, D.C. Dulles Intl Airport for as low as $715 on momondo.

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

As of May 2026, prices for Washington, D.C. Dulles Intl Airport to London Heathrow Airport flights are approximately 9% 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 round-trip 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	$498
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 $498. The best round-trip flight deal from Washington, D.C. Dulles Intl Airport to London Heathrow Airport found on momondo in the last 72 hours is $981.

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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Frequently asked questions about flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

How far is Washington, D.C. Dulles Intl to London Heathrow by plane?
A flight from Washington, D.C. Dulles Intl to London Heathrow will travel around 3664.4 mi. By plane, this route typically takes 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 May 2026, there are 16 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 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 Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Washington, D.C. Dulles Intl Airport to London Heathrow Airport is Boeing 777 (51.52% of total bookings). The next most popular plane models are Boeing 787-9 Dreamliner (15.42%), Boeing 777-300ER (11.87%), and Airbus A350-1000 (4.58%).
What is the most popular airline from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Washington, D.C. Dulles Intl Airport to London Heathrow Airport is British Airways (40% of total bookings). The next most popular airlines are United Airlines (21%), American Airlines (8%), and Virgin Atlantic (8%).

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
Icelandair	PriceFrom $398	Free Cancellation	Rating 7.0 654 reviews	Search Icelandair flights
TAP AIR PORTUGAL	PriceFrom $411	Free Cancellation	Rating 7.2 2,250 reviews	Search TAP AIR PORTUGAL flights
Scandinavian Airlines	PriceFrom $492	Free Cancellation	Rating 7.4 1,775 reviews	Search Scandinavian Airlines flights
Delta	PriceFrom $519	Free Cancellation	Rating 7.9 8,450 reviews	Search Delta flights
British Airways	PriceFrom $528	Free Cancellation	Rating 6.7 7,975 reviews	Search British Airways flights
Virgin Atlantic	PriceFrom $542	Free Cancellation	Rating 7.4 688 reviews	Search Virgin Atlantic flights
American Airlines	PriceFrom $545	Free Cancellation	Rating 7.1 11,663 reviews	Search American Airlines flights
United Airlines	PriceFrom $558	Free Cancellation	Rating 7.4 9,706 reviews	Search United Airlines flights
Iberia	PriceFrom $561	Free Cancellation	Rating 7.0 3,215 reviews	Search Iberia flights
Aer Lingus	PriceFrom $561	Free Cancellation	Rating 7.3 1,554 reviews	Search Aer Lingus flights

Delta Flights From Washington, D.C. Dulles Intl Airport to London Heathrow Airport
The lowest priced Delta flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport from the last 72 hours was $519. Generally, Delta has 7 flights on this route every week with an average price of $870. Delta is rated 7.9/10 by our users.
KLM Flights From Washington, D.C. Dulles Intl Airport to London Heathrow Airport
$618 is the best KLM flight deal from Washington, D.C. Dulles Intl Airport to London Heathrow Airport found on momondo over the last 72 hours. The average KLM ticket price found was closer to $897, however, with flight time and availability significantly affecting the price. KLM (7.8/10 from 1,517 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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To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to London from Washington, D.C..

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

Yes. All flights to London from Washington, D.C. on momondo can be compared and filtered by various policies on offer, including flexible booking.

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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Flights to London Southend Airportfrom $704

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Cheap flights from Washington, D.C. Dulles Intl Airport to London from $426

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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

What is the typical price of a round-trip flight between Washington, D.C. Dulles Intl Airport and 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, D.C. Dulles Intl to London Heathrow flight route?

How far in advance should I book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

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

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

What airlines fly to London Heathrow Airport?

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

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

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

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

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

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

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

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

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

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

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

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Frequently asked questions about flying 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

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

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

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