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.

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

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

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 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.

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 53% 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 airport is the most popular layover for flights between Washington, D.C. Dulles Intl Airport and London?

Reykjavik (KEF) was the most common stop: 52% of momondo users choosing 1-stop flights on this route connected there.

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

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

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

Monday is statistically the day of the week 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 March 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.

$348 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 week?

As of March 2026, 175 flights take off from Washington, D.C. Dulles Intl Airport and land in London each week. The most common flight departure day for this route is Fri, with 17% 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

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

8:20 pm - 4:00 pm

IAD

LHR

14h 40m

1 stop

6:40 am - 5:00 pm

LHR

IAD

15h 20m

2 stops

$617Scandinavian Airlines

Mon, Apr 13 - Thu, Apr 23

1:20 pm - 9:40 pm

IAD

LTN

27h 20m

2 stops

1:50 pm - 11:35 am

LTN

IAD

26h 45m

2 stops

$617Multiple Airlines

Sun, May 3 - Wed, May 13

8:20 pm - 4:25 pm

IAD

LHR

15h 05m

2 stops

6:40 am - 5:00 pm

LHR

IAD

15h 20m

2 stops

$618Scandinavian Airlines

Mon, Apr 20 - Thu, Apr 23

5:05 pm - 9:45 am

IAD

LGW

11h 40m

1 stop

10:35 am - 8:35 pm

LGW

IAD

15h 00m

1 stop

$620TAP AIR PORTUGAL

Tue, Apr 28 - Thu, May 7

10:35 pm - 10:55 pm

IAD

LHR

19h 20m

1 stop

6:00 am - 3:10 pm

LHR

IAD

14h 10m

1 stop

$621TAP AIR PORTUGAL

Mon, May 4 - Wed, May 20

8:20 pm - 7:00 am

IAD

LGW

29h 40m

3 stops

6:55 am - 5:00 pm

LGW

IAD

15h 05m

2 stops

$621Multiple Airlines

Mon, May 4 - Wed, May 13

10:35 pm - 11:55 pm

IAD

LGW

20h 20m

2 stops

6:00 am - 8:35 pm

LGW

IAD

19h 35m

2 stops

$622Multiple Airlines

Mon, Apr 20 - Thu, Apr 30

4:30 pm - 1:10 pm

IAD

LCY

15h 40m

2 stops

4:30 pm - 2:30 pm

LCY

IAD

27h 00m

2 stops

$780ITA Airways

Tue, Apr 21 - Mon, Apr 27

8:20 pm - 12:35 pm

IAD

LCY

11h 15m

1 stop

9:15 am - 4:45 pm

LCY

IAD

12h 30m

1 stop

$785SWISS

Tue, Apr 28 - Tue, May 5

8:20 pm - 12:35 pm

IAD

LCY

11h 15m

1 stop

9:15 am - 4:45 pm

LCY

IAD

12h 30m

1 stop

$786SWISS

Mon, Apr 27 - Wed, May 6

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 13

IAD8:20 pmWashington, D.C. Dulles Intl

14h 40m

1 stop

LHR4:00 pmLondon Heathrow

Apr 23

LHR6:40 amLondon Heathrow

15h 20m

2 stops

IAD5:00 pmWashington, D.C. Dulles Intl

$617

Scandinavian Airlines

Apr 20

IAD8:20 pmWashington, D.C. Dulles Intl

15h 05m

2 stops

LHR4:25 pmLondon Heathrow

Apr 23

LHR6:40 amLondon Heathrow

15h 20m

2 stops

IAD5:00 pmWashington, D.C. Dulles Intl

$618

Scandinavian Airlines

Sep 7

IAD8:20 pmWashington, D.C. Dulles Intl

14h 40m

1 stop

LHR4:00 pmLondon Heathrow

Oct 9

LHR6:40 amLondon Heathrow

15h 20m

1 stop

IAD5:00 pmWashington, D.C. Dulles Intl

$622

TAP AIR PORTUGAL flights from Washington, D.C. Dulles Intl Airport to London

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

TAP AIR PORTUGAL

Apr 28

IAD5:05 pmWashington, D.C. Dulles Intl

11h 40m

1 stop

LGW9:45 amLondon Gatwick

May 7

LGW10:35 amLondon Gatwick

15h 00m

1 stop

IAD8:35 pmWashington, D.C. Dulles Intl

$620

TAP AIR PORTUGAL

May 4

IAD10:35 pmWashington, D.C. Dulles Intl

19h 20m

1 stop

LHR10:55 pmLondon Heathrow

May 13

LHR6:00 amLondon Heathrow

14h 10m

1 stop

IAD3:10 pmWashington, D.C. Dulles Intl

$621

TAP AIR PORTUGAL

Apr 24

IAD5:05 pmWashington, D.C. Dulles Intl

11h 40m

1 stop

LGW9:45 amLondon Gatwick

May 4

LGW4:25 pmLondon Gatwick

27h 45m

1 stop

IAD3:10 pmWashington, D.C. Dulles Intl

$623

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 - LHR

IADLHR

Washington, D.C. Dulles Intl

Mon 4/13

8:20 pm-4:00 pm

1 stop14h 40m

London Heathrow

Thu 4/23

6:40 am-5:00 pm

2 stops15h 20m

$617

Washington, D.C.London

IAD - LTN

IADLTN

Washington, D.C. Dulles Intl

Sun 5/3

1:20 pm-9:40 pm

2 stops27h 20m

London Luton

Wed 5/13

1:50 pm-11:35 am

2 stops26h 45m

$617

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mon 4/20

8:20 pm-4:25 pm

2 stops15h 05m

London Heathrow

Thu 4/23

6:40 am-5:00 pm

2 stops15h 20m

$618

Washington, D.C.London

IAD - LGW

IADLGW

Washington, D.C. Dulles Intl

Tue 4/28

5:05 pm-9:45 am

1 stop11h 40m

London Gatwick

Thu 5/7

10:35 am-8:35 pm

1 stop15h 00m

$620

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mon 5/4

10:35 pm-10:55 pm

1 stop19h 20m

London Heathrow

Wed 5/20

6:00 am-3:10 pm

1 stop14h 10m

$621

Washington, D.C.London

IAD - LGW

IADLGW

Washington, D.C. Dulles Intl

Mon 5/4

8:20 pm-7:00 am

3 stops29h 40m

London Gatwick

Wed 5/13

6:55 am-5:00 pm

2 stops15h 05m

$621

Washington, D.C.London

IAD - LGW

IADLGW

Washington, D.C. Dulles Intl

Mon 4/20

10:35 pm-11:55 pm

2 stops20h 20m

London Gatwick

Thu 4/30

6:00 am-8:35 pm

2 stops19h 35m

$622

Washington, D.C.London

IAD - LCY

IADLCY

Washington, D.C. Dulles Intl

Tue 4/21

4:30 pm-1:10 pm

2 stops15h 40m

London City

Mon 4/27

4:30 pm-2:30 pm

2 stops27h 00m

$780

Quickest round-trip

Washington, D.C.London

IAD - LCY

IADLCY

Washington, D.C. Dulles Intl

Tue 4/28

8:20 pm-12:35 pm

1 stop11h 15m

London City

Tue 5/5

9:15 am-4:45 pm

1 stop12h 30m

$785

Washington, D.C.London

IAD - LCY

IADLCY

Washington, D.C. Dulles Intl

Mon 4/27

8:20 pm-12:35 pm

1 stop11h 15m

London City

Wed 5/6

9:15 am-4:45 pm

1 stop12h 30m

$786

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 $629, 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 $642.

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 $753. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $870. 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 $800 when looking at flights departing in the afternoon. Flights to London are more costly in the evening, with an average ticket price of $807. 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 $766 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 $722 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?

You could potentially save up to 19% 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 March 2026, prices for Washington, D.C. Dulles Intl Airport to London flights are approximately 51% 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	$424
Fastest flight time	7h 10m
Direct flights	Mon, Tue, Wed, Thu, Sat and Sun
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 $424. The best round-trip flight deal from Washington, D.C. Dulles Intl Airport to London found on momondo in the last 72 hours is $756.

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 on Monday, Tuesday, Wednesday, Thursday, Saturday and Sunday. There are no airlines offering direct flights.

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

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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 March 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 (45.46% of total bookings). The next most popular plane models are Boeing 787-9 Dreamliner (17.12%), Airbus A350-1000 (8.96%), and Boeing 767-300 (5.45%).
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 34% of all bookings. The subsequent popular airlines are United Airlines at 18%, Icelandair at 9%, 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 $395	Free Cancellation	Rating 7.1 2,172 reviews	Search TAP AIR PORTUGAL flights
Icelandair	PriceFrom $398	Free Cancellation	Rating 7.0 625 reviews	Search Icelandair flights
Scandinavian Airlines	PriceFrom $454	Free Cancellation	Rating 7.3 1,720 reviews	Search Scandinavian Airlines flights
Delta	PriceFrom $530	Free Cancellation	Rating 7.9 8,313 reviews	Search Delta flights
British Airways	PriceFrom $538	Free Cancellation	Rating 6.7 7,807 reviews	Search British Airways flights
Virgin Atlantic	PriceFrom $552	Free Cancellation	Rating 7.5 682 reviews	Search Virgin Atlantic flights
United Airlines	PriceFrom $558	Free Cancellation	Rating 7.4 9,458 reviews	Search United Airlines flights
Aer Lingus	PriceFrom $561	Free Cancellation	Rating 7.2 1,481 reviews	Search Aer Lingus flights
American Airlines	PriceFrom $572	Free Cancellation	Rating 7.1 11,486 reviews	Search American Airlines flights
Iberia	PriceFrom $574	Free Cancellation	Rating 7.0 3,147 reviews	Search Iberia 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 $530 round-trip. Over the 7 Delta flights for this route in a normal week, average airfare is usually $834 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, 1,477 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 $830.

Gatwick

Hounslow

Milton Keynes

Luton

Dover

Slough

Crawley

Wembley

Hayes

Dartford

Croydon

Harrow

Watford

Brentwood

Guildford

Stansted

Cobham

Folkestone

Romford

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 $347

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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

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Our best TAP AIR PORTUGAL 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

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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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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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