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Cheap flights from Washington, D.C. Dulles Intl Airport to London from £243

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/4. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — LON
29 Mar — 5 Apr1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Washington, D.C. Dulles Intl to London are usually found in September or October, booked 74 days in advance, depart on a Sunday or Tuesday and return on a Thursday

Cheap flight deals from Dulles Intl to London

Enter your travel dates to find the best prices.

Cheapest flights from Dulles Intl to London
Explore the most affordable flight options available from Dulles Intl to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 27 February 2026.

Thu 14/520:30
IAD
-
LHR
1 stop10h 25m
Icelandair
Mon 18/521:25
LHR
-
IAD
1 stop26h 55m
Icelandair
Deal found 23/2£415
Thu 27/820:30
IAD
-
LHR
1 stop10h 25m
Icelandair
Mon 31/821:25
LHR
-
IAD
1 stop26h 55m
Icelandair
Deal found 23/2£415
Mon 20/420:20
IAD
-
LHR
2 stops15h 05m
Scandinavian Airlines
Mon 27/406:40
LHR
-
IAD
1 stop15h 20m
Scandinavian Airlines
Deal found 23/2£416
Thu 27/820:20
IAD
-
LHR
1 stop32h 00m
Scandinavian Airlines
Sun 30/806:40
LHR
-
IAD
2 stops15h 20m
Scandinavian Airlines
Deal found 23/2£417
Wed 12/820:30
IAD
-
LGW
1 stop10h 15m
Icelandair
Sun 16/815:40
LGW
-
IAD
1 stop11h 35m
Icelandair
Deal found 23/2£418
Sun 30/823:20
IAD
-
LGW
1 stop31h 25m
Icelandair
Sat 5/915:40
LGW
-
IAD
1 stop32h 40m
Icelandair
Deal found 24/2£418
Mon 31/820:30
IAD
-
LHR
1 stop10h 25m
Icelandair
Mon 7/921:25
LHR
-
IAD
1 stop26h 55m
Icelandair
Deal found 23/2£418
Sun 19/420:20
IAD
-
STN
2 stops22h 15m
Multiple Airlines
Sun 26/413:35
STN
-
IAD
2 stops32h 25m
Multiple Airlines
Deal found 23/2£420
Fri 24/417:05
IAD
-
LGW
1 stop11h 40m
TAP AIR PORTUGAL
Thu 30/421:20
LGW
-
IAD
2 stops22h 50m
TAP AIR PORTUGAL
Deal found 23/2£420
Tue 17/320:40
IAD
-
LHR
1 stop10h 10m
Icelandair
Tue 31/321:25
LHR
-
IAD
1 stop26h 55m
Icelandair
Deal found 24/2£420
Mon 6/420:20
IAD
-
STN
1 stop17h 30m
Multiple Airlines
Wed 15/407:00
STN
-
IAD
1 stop15h 00m
Multiple Airlines
Deal found 25/2£421
Wed 22/420:30
IAD
-
LGW
1 stop13h 10m
Icelandair
Mon 27/415:40
LGW
-
IAD
1 stop32h 40m
Icelandair
Deal found 24/2£421

Find flight deals from Dulles Intl to London

Discover tips and strategies to find the most affordable flight options for your journey from Dulles Intl (IAD) to London (LON). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 27 February 2026.

Round-trip from

£415

One-way from

£243

Popular in

June

Cheapest in

September

Average price

£499

Good round-trip deal

£476 or less

Good one-way deal

£282 or less
Icelandair
  • Icelandair
  • 14/5-18/5
  • 2 total stops
  • 37h 20m total
  • Washington, D.C. to London
Search Deals
9/4
  • 9/4
  • 2 total stops
  • 23h 00m total
  • Washington, D.C. to London
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£60 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£13 potential savings vs. average return price).
Search Deals
Average for round-trip flights in February 2026
Search Deals
Price to beat on a round-trip flight from Washington, D.C. Dulles Intl to London (LON).
Search Deals
Price to beat on a one-way flight from Washington, D.C. Dulles Intl to London (LON).
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Dulles Intl to London that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 27 February 2026.
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 - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 8/4

22:10-10:40

Nonstop7h 30m

London Heathrow

Mon 13/4

17:50-14:20

1 stop25h 30m

£477

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mon 27/4

22:55-11:20

Nonstop7h 25m

London Heathrow

Tue 5/5

17:55-20:55

Nonstop8h 00m

£489

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 1/4

18:25-06:55

Nonstop7h 30m

London Heathrow

Fri 10/4

16:40-19:55

Nonstop8h 15m

£489

Washington, D.C.London

IAD - LCY

IADLCY

Washington, D.C. Dulles Intl

Wed 12/8

18:10-08:50

1 stop9h 40m

London City

Thu 20/8

07:45-15:35

1 stop12h 50m

£493

Washington, D.C.London

IAD - LCY

IADLCY

Washington, D.C. Dulles Intl

Wed 29/4

18:10-08:50

1 stop9h 40m

London City

Wed 6/5

08:25-23:32

2 stops20h 07m

£500

Washington, D.C.London

IAD - LGW

IADLGW

Washington, D.C. Dulles Intl

Sun 15/3

14:30-22:35

1 stop28h 05m

London Gatwick

Tue 24/3

17:05-12:45

1 stop23h 40m

£505

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Thu 23/4

22:55-11:20

Nonstop7h 25m

London Heathrow

Tue 28/4

08:40-15:35

1 stop11h 55m

£505

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 5/4

22:55-11:20

Nonstop7h 25m

London Heathrow

Sun 19/4

08:55-16:05

1 stop12h 10m

£509

Washington, D.C.London

IAD - LTN

IADLTN

Washington, D.C. Dulles Intl

Wed 6/5

20:30-16:35

2 stops15h 05m

London Luton

Sun 10/5

08:00-19:00

2 stops16h 00m

£509

Washington, D.C.London

IAD - LGW

IADLGW

Washington, D.C. Dulles Intl

Mon 10/8

18:15-09:40

1 stop10h 25m

London Gatwick

Mon 24/8

10:25-19:35

1 stop14h 10m

£513

Flights are sorted by cheapest return flights first.

Deals found on 24/2

Showing 1-10 of 60 resultsSorted by cheapest first
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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 return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

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

Use this chart to determine the optimal time to book a return flight from Dulles Intl to London. Price data was last updated on 20 February 2026.

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 74 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.

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

Currently, March is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to London (average of £254). Flying from Washington, D.C. Dulles Intl Airport to London in June is currently the most expensive (average of £537). 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?

Find hourly flight availability from Dulles Intl to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 27 February 2026.

When flying from Washington, D.C. Dulles Intl Airport to London, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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

Explore weekly flight availability from Dulles Intl to London. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 27 February 2026.

The most flights from IAD to LON are scheduled on a Wednesday (26 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (20 on average).

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

Share of one-stop return flights from Washington, D.C. Dulles Intl Airport to London chosen by Cheapflights users in the past 12 months, using the same stopover each way.

Reykjavik (KEF) – chosen by Cheapflights users on 44% of one-stop itineraries from Washington, D.C. Dulles Intl Airport to London on Cheapflights.

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

Average return fare for one-stop flights from Washington, D.C. Dulles Intl Airport to London, chosen by Cheapflights users in the past 12 months, with the same stopover each way.

Reykjavik (KEF) is the most affordable one-stop option, with an average return flight price of £433.

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

Shortest average travel time for one-stop one-way flights from Washington, D.C. Dulles Intl Airport to London, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.

Flights via Dublin (DUB) have the shortest average one-way travel time for one-stop routes: 9h 25m.

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

Average stopover duration for one-stop one-way flights from Washington, D.C. Dulles Intl Airport to London, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Reykjavik (KEF) offer the fastest connection on this route, with an average stopover time of 1h 21m.

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

About 19% of weekly flights between Washington, D.C. and London have experienced delays in the past year, with the average delay time being 165 minutes.

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

Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the early afternoon 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 Friday 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 past year, British Airways have had the lowest number of delays on this route, with just 15% of flights being delayed.

Reviews of airlines servicing London

Get insights into the airlines that provide service to London. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to London. Reviews last updated 27 February 2026.
See what other customers who have flown with Virgin Atlantic, United Airlines, andIcelandair from Washington, D.C. Dulles Intl Airport to London have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Virgin Atlantic
7.5
Good
679 reviews
Check prices

Boarding

7.7

Crew

8.2

Entertainment

7.6

Overall

7.5

Comfort

7.3

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
679 reviews
Virgin Atlantic
7.5
Good
679 reviews
Check prices

Boarding

7.7

Crew

8.2

Entertainment

7.6

Overall

7.5

Comfort

7.3

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
7.4
Good
9,358 reviews
Virgin Atlantic
7.5
Good
679 reviews
Check prices

Boarding

7.7

Crew

8.2

Entertainment

7.6

Overall

7.5

Comfort

7.3

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
7.1
Good
617 reviews
Virgin Atlantic
7.5
Good
679 reviews
Check prices

Boarding

7.7

Crew

8.2

Entertainment

7.6

Overall

7.5

Comfort

7.3

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!
Iberia
7.0
Good
3,127 reviews
Virgin Atlantic
7.5
Good
679 reviews
Check prices

Boarding

7.7

Crew

8.2

Entertainment

7.6

Overall

7.5

Comfort

7.3

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
7,772 reviews
Virgin Atlantic
7.5
Good
679 reviews
Check prices

Boarding

7.7

Crew

8.2

Entertainment

7.6

Overall

7.5

Comfort

7.3

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

Find useful and relevant information for your journey from Dulles Intl to London. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

    There are many flights that can get you from Washington, D.C. Dulles Intl Airport to London in 7h 25m. Fly via United Airlines, KLM, or Delta to get the fastest option. Airlines will cover a distance of 3664 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

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

    Flying on Lufthansa is currently your cheapest option to London, with prices starting at £306. Additional return tickets that might be worth considering are offered by Virgin Atlantic and British Airways, with the lowest prices starting at £379 and £383, respectively. Lufthansa is 43% cheaper than the average price of flights available within the next 90 days to this destination.

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

    The cheapest airline one-way is TAP AIR PORTUGAL, with whom users have recently found tickets for as low as £158. However, be on the lookout for offers from Virgin Atlantic and British Airways, 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?

    The most popular flight routes from Washington, D.C. Dulles Intl Airport to London are Washington, D.C. Dulles Intl - London Heathrow, Washington, D.C. Dulles Intl - London Gatwick and Washington, D.C. Dulles Intl - London Stansted.

  • 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: KLM (85%), Air France (85%), Delta (85%).

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

    Looking at all options, your cheapest flight can be booked for £267. While the most popular route (Washington, D.C. Dulles Intl - London Heathrow) can be booked for £326 on average, our data indicates £405 when flying from Washington, D.C. Dulles Intl Airport to London.

  • 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 holiday 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, March is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to London (average of £254). Flying from Washington, D.C. Dulles Intl Airport to London in June is currently the most expensive (average of £537). 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

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Top 6 airlines flying from Dulles Intl to London

Discover the top 6 airlines that operate flights from Dulles Intl to London. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 27 February 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£306Average£425FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Virgin AtlanticCheapest£379Average£586FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£383Average£552FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Air FranceCheapest£394Average£550FlexibilityNo cancel feeOn-time77%
Search Air France flights
IberiaCheapest£453Average£555FlexibilityNo cancel feeOn-time77%
Search Iberia flights
United AirlinesCheapest£489Average£587FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Dulles Intl to London?

When you search for this flight from Dulles Intl to London, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from Dulles Intl to London?

Millions of users choose and trust Cheapflights to book the best flight deals from Dulles Intl to London for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Dulles Intl to London with no change fees?

Certainly. Search results for flights to London from Dulles Intl shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Dulles Intl to London become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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