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

Reykjavik (KEF) was the most common stop: 49% of momondo users choosing 1-stop flights on this route connected there.

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.

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

Flights via Lisbon (LIS) offer the lowest average round-trip price of $445.

What airlines fly to London?

British Airways, United Airlines and American Airlines are the top three most popular airlines that fly to London 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. Keep in mind that there are 16 different airlines that fly to London on a routine basis, so you have a few additional options to choose from.

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

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?

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

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.

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

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

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.

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

Prices for flights from Washington, D.C. Dulles Intl Airport to London are refreshed on a daily basis.

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

As of May 2026, there are 16 operators available to choose from for flights from Washington, D.C. Dulles Intl Airport to London.

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

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.

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

The required travel and health documents for your London trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at London. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

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

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

Prices are currently low for flights on this route. Typical prices usually range from $1,088 to $729. The lowest price recently found on this route was $804.

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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 round-trip flights

Enter your travel dates to find the best prices.

8:30 pm - 2:40 pm

IAD

LGW

13h 10m

1 stop

3:40 pm - 10:15 pm

LGW

IAD

11h 35m

1 stop

$804Icelandair

Thu, Aug 27 - Sun, Sep 27

8:30 pm - 8:30 pm

IAD

LTN

19h 00m

3 stops

7:55 am - 7:00 pm

LTN

IAD

16h 05m

2 stops

$804Multiple Airlines

Thu, Oct 15 - Mon, Oct 19

8:20 pm - 8:55 am

IAD

LHR

31h 35m

2 stops

7:50 pm - 5:00 pm

LHR

IAD

26h 10m

2 stops

$805Scandinavian Airlines

Sat, Oct 10 - Fri, Oct 16

8:20 pm - 6:50 pm

IAD

LHR

17h 30m

2 stops

7:05 am - 5:00 pm

LHR

IAD

14h 55m

2 stops

$806Scandinavian Airlines

Sat, Sep 12 - Mon, Sep 21

8:30 pm - 2:40 pm

IAD

LGW

13h 10m

1 stop

3:40 pm - 10:15 pm

LGW

IAD

11h 35m

1 stop

$806Icelandair

Thu, Aug 27 - Sat, Sep 5

5:05 pm - 9:45 am

IAD

LGW

11h 40m

1 stop

9:15 pm - 8:35 pm

LGW

IAD

28h 20m

2 stops

$808TAP AIR PORTUGAL

Tue, Sep 29 - Tue, Oct 6

1:20 pm - 9:55 am

IAD

STN

15h 35m

1 stop

5:35 pm - 11:35 am

STN

IAD

23h 00m

1 stop

$808Turkish Airlines

Tue, Sep 8 - Tue, Sep 22

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

5:45 pm - 6:20 am

IAD

LHR

7h 35mnonstop

2:00 pm - 5:25 pm

LHR

IAD

8h 25mnonstop

$816British Airways

Sat, Oct 17 - Tue, Oct 20

1:20 pm - 4:50 pm

IAD

STN

22h 30m

1 stop

5:45 pm - 11:35 am

STN

IAD

22h 50m

1 stop

$825Turkish Airlines

Fri, Oct 2 - Wed, Oct 7

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

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

Scandinavian Airlines

Jun 10

IAD8:20 pmWashington, D.C. Dulles Intl

14h 40m

1 stop

LHR4:00 pmLondon Heathrow

Aug 8

LHR6:40 amLondon Heathrow

15h 20m

1 stop

IAD5:00 pmWashington, D.C. Dulles Intl

$867

Scandinavian Airlines

May 20

IAD8:20 pmWashington, D.C. Dulles Intl

16h 20m

1 stop

LHR5:40 pmLondon Heathrow

May 24

LHR6:40 amLondon Heathrow

15h 20m

2 stops

IAD5:00 pmWashington, D.C. Dulles Intl

$1,024

Scandinavian Airlines

May 25

IAD8:20 pmWashington, D.C. Dulles Intl

35h 35m

2 stops

LHR12:55 pmLondon Heathrow

May 28

LHR10:20 amLondon Heathrow

11h 40m

1 stop

IAD5:00 pmWashington, D.C. Dulles Intl

$1,033

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

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

Icelandair

Aug 27

IAD8:30 pmWashington, D.C. Dulles Intl

13h 10m

1 stop

LGW2:40 pmLondon Gatwick

Sep 27

LGW3:40 pmLondon Gatwick

11h 35m

1 stop

IAD10:15 pmWashington, D.C. Dulles Intl

$804

Icelandair

Aug 27

IAD8:30 pmWashington, D.C. Dulles Intl

13h 10m

1 stop

LGW2:40 pmLondon Gatwick

Sep 5

LGW3:40 pmLondon Gatwick

11h 35m

1 stop

IAD10:15 pmWashington, D.C. Dulles Intl

$806

Icelandair

Aug 28

IAD8:30 pmWashington, D.C. Dulles Intl

13h 10m

1 stop

LGW2:40 pmLondon Gatwick

Sep 2

LGW3:40 pmLondon Gatwick

32h 40m

1 stop

IAD7:20 pmWashington, D.C. Dulles Intl

$807

momondo Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Washington, D.C.London

IAD - LGW

IADLGW

Washington, D.C. Dulles Intl

Thu 8/27

8:30 pm-2:40 pm

1 stop13h 10m

London Gatwick

Sun 9/27

3:40 pm-10:15 pm

1 stop11h 35m

$804

Washington, D.C.London

IAD - LTN

IADLTN

Washington, D.C. Dulles Intl

Thu 10/15

8:30 pm-8:30 pm

3 stops19h 00m

London Luton

Mon 10/19

7:55 am-7:00 pm

2 stops16h 05m

$804

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sat 10/10

8:20 pm-8:55 am

2 stops31h 35m

London Heathrow

Fri 10/16

7:50 pm-5:00 pm

2 stops26h 10m

$805

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sat 9/12

8:20 pm-6:50 pm

2 stops17h 30m

London Heathrow

Mon 9/21

7:05 am-5:00 pm

2 stops14h 55m

$806

Washington, D.C.London

IAD - LGW

IADLGW

Washington, D.C. Dulles Intl

Thu 8/27

8:30 pm-2:40 pm

1 stop13h 10m

London Gatwick

Sat 9/5

3:40 pm-10:15 pm

1 stop11h 35m

$806

Washington, D.C.London

IAD - LGW

IADLGW

Washington, D.C. Dulles Intl

Tue 9/29

5:05 pm-9:45 am

1 stop11h 40m

London Gatwick

Tue 10/6

9:15 pm-8:35 pm

2 stops28h 20m

$808

Washington, D.C.London

IAD - STN

IADSTN

Washington, D.C. Dulles Intl

Tue 9/8

1:20 pm-9:55 am

1 stop15h 35m

London Stansted

Tue 9/22

5:35 pm-11:35 am

1 stop23h 00m

$808

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

Quickest round-trip

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sat 10/17

5:45 pm-6:20 am

Nonstop7h 35m

London Heathrow

Tue 10/20

2:00 pm-5:25 pm

Nonstop8h 25m

$816

Washington, D.C.London

IAD - STN

IADSTN

Washington, D.C. Dulles Intl

Fri 10/2

1:20 pm-4:50 pm

1 stop22h 30m

London Stansted

Wed 10/7

5:45 pm-11:35 am

1 stop22h 50m

$825

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 Washington, D.C. Dulles Intl Airport to London

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?

What is the cheapest month to fly to London?

The cheapest month to fly to London from Washington, D.C. Dulles Intl Airport is in January. Flight prices, which tend to average around $416, are often lower during this time because this is during the off-season. The month of February is another great option to travel to London, with average flight prices from Washington, D.C. Dulles Intl Airport averaging around $418.

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

The cheapest day to depart from Washington, D.C. Dulles Intl Airport to London is on a Wednesday. Travelers who choose to depart for London on a Wednesday will often find tickets for as low as $776. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $907. These prices are subject to change though, so be sure to set up a Price Alert for flights to London.

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

Flying to London from Washington, D.C. Dulles Intl Airport in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $819 when looking at flights departing in the afternoon. Flights to London are more costly in the evening, with an average ticket price of $865. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

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

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

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

You are more likely to see cheaper flights to London 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 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 from Washington, D.C. Dulles Intl Airport for as low as $715 on momondo.

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

You could potentially save up to 25% on your flight if you consider stops on a Washington, D.C. Dulles Intl Airport to London flight.

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

As of May 2026, prices for Washington, D.C. Dulles Intl Airport to London flights are approximately 37% 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

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. Dulles Intl Airport to London 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 (IAD to LON) 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

Best Price Found	$498
Fastest flight time	7h 10m
Direct flights	Every day
Airports in London	6 airports

The best one-way flight to London 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 found on momondo in the last 72 hours is $981.

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

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

There are 6 airports in London. From Washington, D.C. Dulles Intl Airport there are direct flights to London Heathrow (LHR).

Search flight deals

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

How far is Washington, D.C. Dulles Intl to London by plane?
London is 3677.3 mi away from Washington, D.C. Dulles Intl. 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?
Prices for flights from Washington, D.C. Dulles Intl Airport to London are refreshed on a daily basis.
How many operators does momondo search for flights from Washington, D.C. Dulles Intl Airport to London?
As of May 2026, there are 16 operators available to choose from for flights from Washington, D.C. Dulles Intl Airport to London.
How old do you have to be to fly from Washington, D.C. Dulles Intl Airport to London?
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.
What documentation or ID do you need to fly to London?
The required travel and health documents for your London trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at London. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular plane model from Washington, D.C. Dulles Intl Airport to London?
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 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?
momondo data reveals that the most frequently booked airline on the route from Washington, D.C. Dulles Intl Airport to London is British Airways, representing 36% of all bookings. The subsequent popular airlines are United Airlines at 19%, Icelandair at 8%, and American Airlines at 8%.

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

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

Airline	Rating	Free Cancellation	Price
TAP AIR PORTUGAL	PriceFrom $309	Free Cancellation	Rating 7.2 2,253 reviews	Search TAP AIR PORTUGAL flights
Icelandair	PriceFrom $398	Free Cancellation	Rating 7.0 654 reviews	Search Icelandair flights
Scandinavian Airlines	PriceFrom $492	Free Cancellation	Rating 7.4 1,778 reviews	Search Scandinavian Airlines flights
Delta	PriceFrom $519	Free Cancellation	Rating 7.9 8,455 reviews	Search Delta flights
British Airways	PriceFrom $528	Free Cancellation	Rating 6.7 7,982 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 11,662 reviews	Search American Airlines flights
United Airlines	PriceFrom $558	Free Cancellation	Rating 7.4 9,727 reviews	Search United Airlines flights
Iberia	PriceFrom $561	Free Cancellation	Rating 7.0 3,218 reviews	Search Iberia flights
Aer Lingus	PriceFrom $561	Free Cancellation	Rating 7.3 1,563 reviews	Search Aer Lingus flights

Delta Flights From Washington, D.C. Dulles Intl Airport to London
Delta flight deals from Washington, D.C. Dulles Intl Airport to London start from $519 round-trip. Over the 7 Delta flights for this route in a normal week, average airfare is usually $870 round-trip - but some users have found much cheaper deals with momondo.
KLM Flights From Washington, D.C. Dulles Intl Airport to London
Another popular option for Washington, D.C. Dulles Intl Airport to London flights is KLM (7.8/10, 1,517 ratings). KLM flies from Washington, D.C. Dulles Intl Airport to London around 7 times per week, with deals starting from $618 round-trip and rising to an average price of around $897.

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Dover

Luton

Hayes

Crawley

Wembley

Slough

Croydon

Stansted

Watford

Harrow

Brentwood

Dartford

Cobham

Folkestone

Romford

Uxbridge

Guildford

Why use momondo?

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

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?

momondo does allow users to show only those flights to London from Washington, D.C. which offer a flexible booking policy as well as other useful filters and features.

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

momondo provides multiple filters to help you find the best flight to London from Washington, D.C.. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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 simply researching potential flights to London, momondo offers a useful price alert feature which will track prices for flights to London from Washington, D.C. and alert you when they change.

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

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

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

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

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

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

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

What is the cheapest month to fly to London?

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

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

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

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

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

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

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

What airlines fly to London?

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?

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

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

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

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

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

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

Cheap Washington, D.C. Dulles Intl Airport to London (IAD to LON) 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

Best Price Found

Fastest flight time

Direct flights

Airports in London

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

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

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

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

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

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An easier way to manage your London trip

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Airports listed have a maximum distance of 35.6 mi from London

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List of cabin classes available on flights landing in London. Availability may vary depending on flight origin and airline.

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