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 40m.

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.

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 evening 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 20% 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 163 minutes.

What airlines fly to London?

British Airways, United Airlines and Iberia 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 50% of people opting to fly with this airline when traveling to London. Keep in mind that there are 17 different airlines that fly to London on a routine basis, so you have a few additional options to choose from.

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. 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?

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

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: 51% of momondo users choosing 1-stop flights on this route connected there.

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.

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.

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 February 2026, there are 17 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.

$329 Cheap Flights from Washington, D.C. Dulles Intl Airport to London in 2026

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

21 flights are operational daily from Washington, D.C. Dulles Intl Airport to London as of February 2026. The most popular departure time for this route is 6:00PM, with 100% of flights per day 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 round-trip flights

Enter your travel dates to find the best prices.

8:30 pm - 11:45 am

IAD

LGW

10h 15m

1 stop

3:40 pm - 7:20 pm

LGW

IAD

32h 40m

1 stop

$536Icelandair

Fri, May 1 - Sat, May 9

8:30 pm - 11:55 am

IAD

LHR

10h 25m

1 stop

9:25 pm - 10:15 pm

LHR

IAD

29h 50m

1 stop

$537Icelandair

Fri, May 1 - Sat, May 9

8:30 pm - 11:55 am

IAD

LHR

10h 25m

1 stop

1:05 pm - 7:20 pm

LHR

IAD

11h 15m

1 stop

$539Icelandair

Sat, May 2 - Wed, May 13

8:30 pm - 11:55 am

IAD

LHR

10h 25m

1 stop

9:25 pm - 10:15 pm

LHR

IAD

29h 50m

1 stop

$541Icelandair

Sat, May 2 - Tue, May 12

8:20 pm - 4:30 pm

IAD

STN

15h 10m

2 stops

6:55 pm - 4:50 pm

STN

IAD

26h 55m

2 stops

$542Multiple Airlines

Wed, Apr 15 - Sun, Apr 19

8:30 pm - 2:40 pm

IAD

LGW

13h 10m

1 stop

3:40 pm - 7:20 pm

LGW

IAD

32h 40m

1 stop

$543Icelandair

Tue, Apr 7 - Wed, Apr 15

6:50 pm - 9:35 am

IAD

LHR

33h 45m

2 stops

6:40 am - 4:50 pm

LHR

IAD

15h 10m

1 stop

$544Scandinavian Airlines

Mon, Apr 20 - Thu, Apr 23

8:20 pm - 7:55 pm

IAD

LTN

18h 35m

2 stops

8:35 pm - 4:50 pm

LTN

IAD

25h 15m

2 stops

$544Multiple Airlines

Thu, Apr 16 - Sat, Apr 25

6:30 pm - 9:50 am

IAD

LGW

11h 20m

1 stop

9:20 pm - 4:15 pm

LGW

IAD

46h 55m

2 stops

$551TAP AIR PORTUGAL

Mon, Mar 9 - Tue, Mar 24

7:05 pm - 4:35 pm

IAD

LCY

17h 30m

1 stop

10:00 am - 5:05 pm

LCY

IAD

11h 05m

1 stop

$636Virgin Atlantic

Tue, Mar 17 - Tue, Mar 24

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

Apr 20

IAD6:50 pmWashington, D.C. Dulles Intl

33h 45m

2 stops

LHR9:35 amLondon Heathrow

Apr 23

LHR6:40 amLondon Heathrow

15h 10m

1 stop

IAD4:50 pmWashington, D.C. Dulles Intl

$544

Scandinavian Airlines

Feb 25

IAD8:30 pmWashington, D.C. Dulles Intl

14h 55m

2 stops

LHR4:25 pmLondon Heathrow

Mar 4

LHR10:20 amLondon Heathrow

11h 55m

1 stop

IAD5:15 pmWashington, D.C. Dulles Intl

$557

Scandinavian Airlines

Mar 2

IAD7:52 pmWashington, D.C. Dulles Intl

32h 28m

2 stops

LHR9:20 amLondon Heathrow

Mar 5

LHR6:40 amLondon Heathrow

15h 35m

1 stop

IAD5:15 pmWashington, D.C. Dulles Intl

$560

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

May 1

IAD8:30 pmWashington, D.C. Dulles Intl

10h 15m

1 stop

LGW11:45 amLondon Gatwick

May 9

LGW3:40 pmLondon Gatwick

32h 40m

1 stop

IAD7:20 pmWashington, D.C. Dulles Intl

$536

Icelandair

May 1

IAD8:30 pmWashington, D.C. Dulles Intl

10h 25m

1 stop

LHR11:55 amLondon Heathrow

May 9

LHR9:25 pmLondon Heathrow

29h 50m

1 stop

IAD10:15 pmWashington, D.C. Dulles Intl

$537

Icelandair

May 2

IAD8:30 pmWashington, D.C. Dulles Intl

10h 25m

1 stop

LHR11:55 amLondon Heathrow

May 13

LHR1:05 pmLondon Heathrow

11h 15m

1 stop

IAD7:20 pmWashington, D.C. Dulles Intl

$539

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

Washington, D.C.London

IAD - LGW

IADLGW

Washington, D.C. Dulles Intl

Fri 5/1

8:30 pm-11:45 am

1 stop10h 15m

London Gatwick

Sat 5/9

3:40 pm-7:20 pm

1 stop32h 40m

$536

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Fri 5/1

8:30 pm-11:55 am

1 stop10h 25m

London Heathrow

Sat 5/9

9:25 pm-10:15 pm

1 stop29h 50m

$537

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sat 5/2

8:30 pm-11:55 am

1 stop10h 25m

London Heathrow

Wed 5/13

1:05 pm-7:20 pm

1 stop11h 15m

$539

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sat 5/2

8:30 pm-11:55 am

1 stop10h 25m

London Heathrow

Tue 5/12

9:25 pm-10:15 pm

1 stop29h 50m

$541

Washington, D.C.London

IAD - STN

IADSTN

Washington, D.C. Dulles Intl

Wed 4/15

8:20 pm-4:30 pm

2 stops15h 10m

London Stansted

Sun 4/19

6:55 pm-4:50 pm

2 stops26h 55m

$542

Washington, D.C.London

IAD - LGW

IADLGW

Washington, D.C. Dulles Intl

Tue 4/7

8:30 pm-2:40 pm

1 stop13h 10m

London Gatwick

Wed 4/15

3:40 pm-7:20 pm

1 stop32h 40m

$543

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mon 4/20

6:50 pm-9:35 am

2 stops33h 45m

London Heathrow

Thu 4/23

6:40 am-4:50 pm

1 stop15h 10m

$544

Washington, D.C.London

IAD - LTN

IADLTN

Washington, D.C. Dulles Intl

Thu 4/16

8:20 pm-7:55 pm

2 stops18h 35m

London Luton

Sat 4/25

8:35 pm-4:50 pm

2 stops25h 15m

$544

Washington, D.C.London

IAD - LGW

IADLGW

Washington, D.C. Dulles Intl

Mon 3/9

6:30 pm-9:50 am

1 stop11h 20m

London Gatwick

Tue 3/24

9:20 pm-4:15 pm

2 stops46h 55m

$551

Washington, D.C.London

IAD - LCY

IADLCY

Washington, D.C. Dulles Intl

Tue 3/17

7:05 pm-4:35 pm

1 stop17h 30m

London City

Tue 3/24

10:00 am-5:05 pm

1 stop11h 05m

$636

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 cheapest month to fly to London?

The cheapest month to fly to London from Washington, D.C. Dulles Intl Airport is in September. Flight prices, which tend to average around $626, are often lower during this time because this is during the off-season. The month of October is another great option to travel to London, with average flight prices from Washington, D.C. Dulles Intl Airport averaging around $649.

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 $757. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $885. 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 $808 when looking at flights departing in the afternoon. Flights to London are more costly in the evening, with an average ticket price of $814. 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 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 $759 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 $711 on momondo.

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

There are 4 cabin classes available to choose from on Washington, D.C. Dulles Intl to London flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

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

No. A direct flight is the cheapest option for a flight between Washington, D.C. Dulles Intl Airport to London.

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

As of February 2026, prices for Washington, D.C. Dulles Intl Airport to London flights are approximately 17% 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	$370
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 $370. The best round-trip flight deal from Washington, D.C. Dulles Intl Airport to London found on momondo in the last 72 hours is $660.

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

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 February 2026, there are 17 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 (44.02% of total bookings). The next most popular plane models are Boeing 787-9 Dreamliner (15.51%), Airbus A350-1000 (11.54%), and Boeing 767-400 (8.73%).
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 33% of all bookings. The subsequent popular airlines are United Airlines at 18%, Icelandair at 10%, and Iberia at 9%.

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 $411	Free Cancellation	Rating 7.1 2,139 reviews	Search TAP AIR PORTUGAL flights
Icelandair	PriceFrom $415	Free Cancellation	Rating 7.1 611 reviews	Search Icelandair flights
Air France	PriceFrom $442	Free Cancellation	Rating 7.4 1,531 reviews	Search Air France flights
Lufthansa	PriceFrom $447	Free Cancellation	Rating 6.8 7,779 reviews	Search Lufthansa flights
Scandinavian Airlines	PriceFrom $454	Free Cancellation	Rating 7.3 1,679 reviews	Search Scandinavian Airlines flights
KLM	PriceFrom $488	Free Cancellation	Rating 7.7 1,451 reviews	Search KLM flights
Delta	PriceFrom $516	Free Cancellation	Rating 7.9 8,179 reviews	Search Delta flights
British Airways	PriceFrom $541	Free Cancellation	Rating 6.7 7,731 reviews	Search British Airways flights
Air Canada	PriceFrom $549	Free Cancellation	Rating 7.1 10,709 reviews	Search Air Canada flights
Virgin Atlantic	PriceFrom $554	Free Cancellation	Rating 7.5 678 reviews	Search Virgin Atlantic 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 $516 round-trip. Over the 5 Delta flights for this route in a normal week, average airfare is usually $788 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 (7.7/10, 1,451 ratings). KLM flies from Washington, D.C. Dulles Intl Airport to London around 5 times per week, with deals starting from $488 round-trip and rising to an average price of around $647.

Gatwick

Hounslow

Milton Keynes

Luton

Dover

Slough

Crawley

Hayes

Wembley

Dartford

Croydon

Brentwood

Guildford

Harrow

Watford

Cobham

Folkestone

Romford

Stansted

Richmond

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.

An easier way to manage your London trip

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Cheap flights from Washington, D.C. Dulles Intl Airport to London from $329

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

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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 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 to London?

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

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

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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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 trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United Kingdom

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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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