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$319+ Cheap flights from Dulles Intl (IAD) to London (LON)

IAD — LON
Dec 5 — Dec 121
Sat 12/5
Sat 12/12
1 adult, Economy
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1. Tell us where you want to go

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Cheapflights Tip: The best prices from Washington, D.C. Dulles Intl to London are usually found in February or March, booked 74 days in advance, depart on a Wednesday or Monday and return on a Wednesday

Cheap flight deals from Dulles Intl to London

Cheapest flights from Dulles Intl to London

Tue 11/247:40 pm -
2 stops21h 10m
Tue 12/17:15 am -
2 stops16h 15m
Deal found 11/3$672
Mon 11/167:40 pm -
1 stop10h 10m
Tue 11/248:35 pm -
1 stop26h 55m
Deal found 11/3$672
Sun 12/610:30 pm -
1 stop12h 15m
Sun 12/1310:40 am -
1 stop14h 55m
Deal found 10/31$674
Mon 11/237:40 pm -
1 stop18h 50m
Wed 12/98:35 pm -
1 stop26h 55m
Deal found 11/2$675
Wed 12/28:30 pm -
2 stops21h 45m
Fri 12/46:15 pm -
3 stops29h 35m
Deal found 11/2$676
Tue 11/247:40 pm -
2 stops14h 40m
Tue 12/18:50 am -
2 stops14h 40m
Deal found 11/3$676
Mon 11/167:40 pm -
2 stops16h 20m
Mon 11/236:40 am -
2 stops16h 50m
Deal found 10/31$676
Sat 12/55:25 pm -
1 stop11h 25m
Sat 12/124:35 pm -
1 stop33h 00m
Deal found 11/2$677
Tue 11/177:40 pm -
1 stop18h 50m
Wed 11/2512:15 pm -
1 stop11h 15m
Deal found 11/1$677
Tue 11/247:40 pm -
2 stops19h 20m
Tue 12/17:45 am -
2 stops15h 45m
Deal found 11/1$677
Wed 11/257:40 pm -
1 stop18h 50m
Mon 12/712:15 pm -
1 stop11h 15m
Deal found 11/2$678
Tue 11/35:25 pm -
2 stops15h 50m
Mon 11/237:45 am -
2 stops35h 55m
Deal found 10/31$678

Find flight deals from Dulles Intl to London

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$672
(Mytrip)

One-way from

$319
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$785

Good round-trip deal

$957 or less

Good one-way deal

$441 or less
Provider with most accurate pricing for Washington, D.C. Dulles Intl-London (LON) flight deals.
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Provider most trusted by Cheapflights users for Washington, D.C. Dulles Intl-London (LON) flights.
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From Washington, D.C. Dulles Intl to London (LON)
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One-way flight from Washington, D.C. Dulles Intl to London (LON)
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($173 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($32 potential savings vs. average RT price).
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Average for round-trip flights in November 2026
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Price to beat on a round-trip flight from Washington, D.C. Dulles Intl to London (LON).
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Price to beat on a one-way flight from Washington, D.C. Dulles Intl to London (LON).
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Cheapflights 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 Washington, D.C. Dulles Intl - LTN London Luton

IADLTN

Washington, D.C. Dulles Intl

Thu 11/26

7:40 pm-11:05 pm

2 stops22h 25m

London Luton

Wed 12/31

12:00 am-6:00 pm

Nonstop0h 00m

$322

Washington, D.C.London

IAD Washington, D.C. Dulles Intl - LHR London Heathrow

IADLHR

Washington, D.C. Dulles Intl

Sun 2/7

10:15 pm-10:50 am

Nonstop7h 35m

London Heathrow

Wed 12/31

12:00 am-6:00 pm

Nonstop0h 00m

$330

Washington, D.C.London

IAD Washington, D.C. Dulles Intl - STN London Stansted

IADSTN

Washington, D.C. Dulles Intl

Mon 11/16

5:25 pm-5:05 pm

1 stop18h 40m

London Stansted

Wed 12/31

12:00 am-6:00 pm

Nonstop0h 00m

$330

Washington, D.C.London

IAD Washington, D.C. Dulles Intl - STN London Stansted

IADSTN

Washington, D.C. Dulles Intl

Thu 12/31

7:40 pm-9:50 pm

2 stops21h 10m

London Stansted

Wed 12/31

12:00 am-6:00 pm

Nonstop0h 00m

$331

Washington, D.C.London

IAD Washington, D.C. Dulles Intl - LHR London Heathrow

IADLHR

Washington, D.C. Dulles Intl

Fri 3/12

7:40 pm-10:50 am

1 stop10h 10m

London Heathrow

Wed 12/31

12:00 am-6:00 pm

Nonstop0h 00m

$332

Washington, D.C.London

IAD Washington, D.C. Dulles Intl - LTN London Luton

IADLTN

Washington, D.C. Dulles Intl

Wed 1/27

7:40 pm-9:40 pm

3 stops21h 00m

London Luton

Wed 12/31

12:00 am-6:00 pm

Nonstop0h 00m

$336

Washington, D.C.London

IAD Washington, D.C. Dulles Intl - LGW London Gatwick

IADLGW

Washington, D.C. Dulles Intl

Tue 12/29

7:40 pm-10:55 am

1 stop10h 15m

London Gatwick

Wed 12/31

12:00 am-6:00 pm

Nonstop0h 00m

$341

Washington, D.C.London

IAD Washington, D.C. Dulles Intl - STN London Stansted

IADSTN

Washington, D.C. Dulles Intl

Tue 12/1

7:40 pm-6:50 pm

3 stops18h 10m

London Stansted

Wed 12/31

12:00 am-6:00 pm

Nonstop0h 00m

$346

Washington, D.C.London

IAD Washington, D.C. Dulles Intl - LTN London Luton

IADLTN

Washington, D.C. Dulles Intl

Wed 12/30

7:40 pm-7:35 am

2 stops30h 55m

London Luton

Wed 12/31

12:00 am-6:00 pm

Nonstop0h 00m

$346

Washington, D.C.London

IAD Washington, D.C. Dulles Intl - LTN London Luton

IADLTN

Washington, D.C. Dulles Intl

Wed 11/11

10:30 pm-3:05 pm

3 stops35h 35m

London Luton

Wed 12/31

12:00 am-6:00 pm

Nonstop0h 00m

$348

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/2

Showing 1-10 of 60 resultsSorted by cheapest first
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Compare providers for flights from Dulles Intl to London

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Dulles Intl to London in November.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy2 starsTrust Score*3 stars
OvagoPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy2 starsTrust Score*1 star
JustAirTicketPrice Accuracy-Trust Score*1 star
CheapfaremartPrice Accuracy-Trust Score*1 star
BusinessClassPrice Accuracy-Trust Score*3 stars
oojoPrice Accuracy3 starsTrust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-London flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Washington, D.C. Dulles Intl Airport-London flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C. Dulles Intl Airport-London flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-London flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Washington, D.C. Dulles Intl Airport-London flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Dulles Intl to London

Have a flexible travel schedule? Discover the best time to fly to London from Dulles Intl with our price prediction graph.
Estimated round-trip price

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. Dulles Intl Airport to London

What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to London?

Currently, February is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to London (average of $705). Flying from Washington, D.C. Dulles Intl Airport to London in June is currently the most expensive (average of $1,281). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from IAD to LON?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Washington, D.C. Dulles Intl Airport to London as you normally would.

Weekly flight availability from Washington, D.C. Dulles Intl Airport to London

The most flights from IAD to LON are scheduled on a Wednesday (27 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (13 on average).

How much does it cost to fly round-trip from Washington, D.C. Dulles Intl Airport to London?

Airfare is typical for this route at the moment.
Washington, D.C. Dulles Intl Airport to London flights typically cost between $642 and $960 in April.
The cheapest round-trip price found within the last 5 days was $672 on Multiple Airlines (Apr 20-Apr 27).

What’s the top layover airport for flights from Washington, D.C. Dulles Intl Airport to London?

Copenhagen (CPH) – chosen by Cheapflights users on 35% of 1-stop itineraries from Washington, D.C. Dulles Intl Airport to London on Cheapflights.

What’s the cheapest layover airport for flights from Washington, D.C. Dulles Intl Airport to London?

Reykjavik (KEF) is the most affordable 1-stop option, with an average round-trip price of $530.

What’s the fastest layover option from Washington, D.C. Dulles Intl Airport to London?

Flights via Dublin (DUB) have the shortest average one-way travel time for 1-stop routes: 9h 58m.

Which airport typically offers the quickest layover for flights from Washington, D.C. Dulles Intl Airport to London?

Flights via Madrid (MAD) offer the fastest connection on this route, with an average layover time of 1h 10m.

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

About 17% of weekly flights between Washington, D.C. and London have experienced delays in the past year, with the average delay time being 173 minutes.

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

Historically, flights departing in the early afternoon are less likely to be delayed, whereas flights leaving in the morning tend to experience delays more often.

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

Monday tends to have the lowest number of delays on this route, whereas Thursday has historically faced a higher average of delays compared to other days of the week.

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

Over the last year, Virgin Atlantic have had the lowest number of delays on this route, with just 13% of flights being delayed.

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

To ensure you get the cheapest price possible for a flight from Washington, D.C. Dulles Intl Airport to London, you should look to book at least 73 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

The best insider tips for Washington, D.C. Dulles Intl Airport to London flights

Cheapflights partnered with top experts to bring you the best recommendations for your Washington, D.C. Dulles Intl Airport to London trip
Our travel experts
Ramsey Qubein

Ramsey Qubein

Expert on LHR and IAD

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more

Reviews of airlines servicing London

Get a feel of what it's like to fly with Virgin Atlantic,United Airlines, andAmerican Airlines from Washington, D.C. Dulles Intl Airport to London by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Virgin Atlantic
7.5
Good
697 reviews

Entertainment

7.5

Overall

7.5

Comfort

7.3

Boarding

7.7

Crew

8.1

Food

6.9

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
Virgin Atlantic
7.5
Good
697 reviews
Virgin Atlantic
7.5
Good
697 reviews

Entertainment

7.5

Overall

7.5

Comfort

7.3

Boarding

7.7

Crew

8.1

Food

6.9

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
United Airlines
7.3
Good
10,463 reviews
Virgin Atlantic
7.5
Good
697 reviews

Entertainment

7.5

Overall

7.5

Comfort

7.3

Boarding

7.7

Crew

8.1

Food

6.9

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
American Airlines
7.0
Good
12,232 reviews
Virgin Atlantic
7.5
Good
697 reviews

Entertainment

7.5

Overall

7.5

Comfort

7.3

Boarding

7.7

Crew

8.1

Food

6.9

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
Icelandair
6.9
Okay
766 reviews
Virgin Atlantic
7.5
Good
697 reviews

Entertainment

7.5

Overall

7.5

Comfort

7.3

Boarding

7.7

Crew

8.1

Food

6.9

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
British Airways
6.7
Okay
8,282 reviews
Virgin Atlantic
7.5
Good
697 reviews

Entertainment

7.5

Overall

7.5

Comfort

7.3

Boarding

7.7

Crew

8.1

Food

6.9

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!

Related info for your journey

  • How long is the flight from Washington, D.C. Dulles Intl Airport to London?

    Airlines like TAP AIR PORTUGAL, Icelandair, and Scandinavian Airlines fly from Washington, D.C. Dulles Intl Airport to London in about 10h 10m. The time it takes to get you to your destination can typically vary by up to 4h 55m. Washington, D.C. Dulles Intl Airport and London are separated by a distance of 3664 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from Washington, D.C. Dulles Intl Airport to London round-trip?

    According to our current data, Virgin Atlantic ($390), TAP AIR PORTUGAL ($424), and Delta ($450) offers the cheapest pricing from Washington, D.C. Dulles Intl Airport to London. Virgin Atlantic is priced at 55% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from Washington, D.C. Dulles Intl Airport to London one-way?

    The cheapest airline one-way is KLM, with whom users have recently found tickets for as low as $229. However, be on the lookout for offers from Icelandair and Delta, as they are both options that can get you from Washington, D.C. Dulles Intl Airport to London for a low price.

  • What are the most popular routes from Washington, D.C. Dulles Intl Airport to London?

    When deciding which route to take from Washington, D.C. Dulles Intl Airport to London consider Washington, D.C. Dulles Intl - London Heathrow, Washington, D.C. Dulles Intl - London Gatwick or Washington, D.C. Dulles Intl - London City as they are the most popular.

  • What are the most reliable airlines from Washington, D.C. Dulles Intl Airport to London?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Washington, D.C. Dulles Intl Airport to London on time: Air Canada (85%), Austrian Airlines (85%), Iberia (82%).

  • What are the cheapest flights from Washington, D.C. Dulles Intl Airport to London?

    While on average a flight from Washington, D.C. Dulles Intl Airport to London is generally $1,674, our data shows the cheapest flight currently is $324. When looking at the most popular route, (Washington, D.C. Dulles Intl - London Heathrow), you can expect to pay $378 for that flight.

  • Can I find deals for flights from Dulles Intl to London that include hotel bookings?

    Yes. In addition to deals on Dulles Intl to London flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Dulles Intl to London?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Dulles Intl to London.

  • Can I find deals for business class flights from Dulles Intl to London?

    Yes. Cheapflights offers flight deals from Dulles Intl to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to London?

    Currently, February is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to London (average of $705). Flying from Washington, D.C. Dulles Intl Airport to London in June is currently the most expensive (average of $1,281). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Ilford
Dorking
Gatwick
Hounslow
Wembley
Harrow
Southend-on-Sea
Basingstoke
Watford
Dartford
Winchester
Croydon
Kingston upon Thames
Chipping Norton
Slough
Eastbourne
Stansted
Sutton
Luton
Bedford

Browse thousands of different options on Cheapflights for your next trip

Top 10 airlines flying from Dulles Intl to London

AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest$390Average$973FlexibilityNo cancel feeOn-time72%
TAP AIR PORTUGALCheapest$424Average$641FlexibilityNo cancel feeOn-timeN/A
DeltaCheapest$450Average$1,075FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$489Average$678FlexibilityNo cancel feeOn-time76%
Scandinavian AirlinesCheapest$496Average$797FlexibilityNo cancel feeOn-time77%
IberiaCheapest$500Average$880FlexibilityNo cancel feeOn-time77%
Air FranceCheapest$581Average$1,069FlexibilityNo cancel feeOn-time77%
SWISSCheapest$593Average$985FlexibilityNo cancel feeOn-time79%
FinnairCheapest$606Average$910FlexibilityNo cancel feeOn-time76%
KLMCheapest$618Average$1,157FlexibilityNo cancel feeOn-time75%

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