IAD - LON

£206 Find Cheap Flights from Washington Dulles Airport to London – Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Dulles Intl to London departing on 19/9. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
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1 adult, Economy, 0 bags

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Everything you should know

Cheapest return fare
£466
Multiple Airlines
Tue 22/9Mon 28/9
IAD - STN • 2 stops
Cheapest direct flights
£560
Typical prices: £508-£798
British Airways
Sun 25/10Tue 1/12
IAD - LHR • Direct
Advice from real travellers
AI-powered summary based on content written by travel experts and KAYAK users. AI can make mistakes.
For London, Lufthansa Premium Economy adds space and an extra checked bag.
United Economy Plus and Virgin Economy Delight add legroom on this long-haul.
Expert advice
Expert advice
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Expert advice
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Top airlines
Cheapest • from £466 (return)
Best reviews • 7.5 score
Airline reviews
Airline reviews
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Airline reviews
Airline reviews
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Direct flights
You can fly direct with British Airways, United Airlines, and Virgin Atlantic. Average duration is 7h 26m
Direct flights
Direct flights
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Direct flights
Direct flights
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Top routes
Cheapest
Most popular
Insights
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Avoid delays
Most punctual • 86% on-time
Best time • Fewest delays
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Top stopover airports
Cheapest • Avg £333 (return)
Shortest trip • 9h 25m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travellers who book at least 2 weeks in advance save around 13% compared to booking last minute.
Insights
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Insights
When to travel
Cheapest • 19% price drop
Most popular
Good to know
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Flight Deals
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Flight Deals

Cheap Flights from Dulles Intl to London (IAD-LON)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from Dulles Intl to London that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent return flight deals from Dulles Intl to London

Tue, 22 Sep - Mon, 28 Sep
Multiple Airlines Logo
22:35 - 21:00
IAD
-
STN
17h 25m
2 stops
Multiple Airlines Logo
17:20 - 20:35
STN
-
IAD
32h 15m
2 stops
£466Multiple Airlines
Wed, 28 Oct - Fri, 4 Dec
TAP AIR PORTUGAL Logo
23:30 - 18:55
IAD
-
LHR
15h 25m
1 stop
TAP AIR PORTUGAL Logo
08:15 - 20:35
LHR
-
IAD
17h 20m
1 stop
£466TAP AIR PORTUGAL
Fri, 23 Oct - Fri, 4 Dec
Icelandair Logo
20:30 - 14:40
IAD
-
LGW
13h 10m
1 stop
Icelandair Logo
11:55 - 18:30
LGW
-
IAD
11h 35m
1 stop
£468Icelandair
Mon, 26 Oct - Sat, 28 Nov
Icelandair Logo
20:40 - 10:50
IAD
-
LHR
10h 10m
1 stop
Icelandair Logo
12:15 - 18:30
LHR
-
IAD
11h 15m
1 stop
£478Icelandair
Wed, 11 Nov - Fri, 13 Nov
United Airlines Logo
22:15 - 10:50
IAD
-
LHR
7h 35mdirect
United Airlines Logo
06:50 - 14:30
LHR
-
IAD
12h 40m
1 stop
£542United Airlines
Mon, 2 Nov - Wed, 4 Nov
United Airlines Logo
22:15 - 10:50
IAD
-
LHR
7h 35mdirect
United Airlines Logo
06:50 - 14:30
LHR
-
IAD
12h 40m
1 stop
£542United Airlines
Sun, 25 Oct - Tue, 1 Dec
British Airways Logo
22:45 - 10:00
IAD
-
LHR
7h 15mdirect
British Airways Logo
16:25 - 19:55
LHR
-
IAD
8h 30mdirect
£560British Airways
Tue, 24 Nov - Thu, 26 Nov
Lufthansa Logo
22:55 - 15:50
IAD
-
LHR
11h 55m
1 stop
Lufthansa Logo
09:30 - 15:55
LHR
-
IAD
11h 25m
1 stop
£562Lufthansa
Wed, 28 Oct - Tue, 1 Dec
British Airways Logo
22:55 - 10:10
IAD
-
LHR
7h 15mdirect
British Airways Logo
12:15 - 15:40
LHR
-
IAD
8h 25mdirect
£573British Airways
Sun, 8 Nov - Tue, 10 Nov
Lufthansa Logo
22:55 - 16:50
IAD
-
LHR
12h 55m
2 stops
Lufthansa Logo
11:10 - 20:05
LHR
-
IAD
13h 55m
1 stop
£578Lufthansa
Booking Insights

KAYAK’s insights & trends for Dulles Intl to London flights

Get data-powered insights and trends into flights from Dulles Intl to London to help you find the cheapest flights, the best time to fly and much more.

How much is a return flight from Washington, D.C. Dulles Intl Airport to London?

This analysis is based on the cheapest return trip price found on KAYAK in the last 12 months by searching for a flight from Washington, D.C. Dulles Intl Airport to London departing in September.

Flight prices are below average for this route right now.

Flights to London from Washington, D.C. Dulles Intl Airport usually cost between £472 and £711 in September.
The lowest price found in the past 5 days was £466 on Multiple Airlines (22 Sept–28 Sept).

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

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest return flight from Washington, D.C. Dulles Intl Airport to London costs £504 on the route between Washington, D.C. Dulles Intl Airport (IAD) and London Heathrow Airport (LHR). It is also the most popular route.

What’s the cheapest day of the week to fly from Washington Dulles Airport to London?

The average price of all round-trip flights from Washington, D.C. Dulles Intl Airport to London clicked on KAYAK for each day over the last 12 months.

If your flying dates are flexible, you should consider flying to London on a Tuesday, as we generally find the cheapest rates on that day for this route. On the other hand, Friday is the most expensive day to fly from Washington Dulles Airport to London. For your return ticket, we recommend flying on a Friday and avoiding Sundays for the best deals.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Washington, D.C. Dulles Intl Airport to London, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Washington, D.C. Dulles Intl Airport to London is February, where tickets cost £515 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is £958 and £797 respectively.

Can I save money by flying with a stopover from Washington, D.C. Dulles Intl Airport to London?

The average return price for all direct flights, flights with one stopover, and flights with two stopovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a stopover may cost you more time, but you can also save money on the route, with a 1 stop stopover the cheapest option at £724 on average.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Washington, D.C. Dulles Intl Airport to London, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Washington, D.C. Dulles Intl Airport to London, you should book around 2 weeks before departure, which saves you about 13% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 3 weeks before departure.

Expert advice

Expert advice for your flight from Dulles Intl to London

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Blane Bachelor

Blane Bachelor

Expert on KLM

Blane Bachelor is a journalist and editor specialising in travel and aviation who writes regularly for top global outlets. Born and raised in Florida, Blane has worked and lived in four countries, including the Netherlands, where she’s currently based with her family. Her favourite way to get to know a new destination is by running or riding a bike around town – or hearing a spooky ghost story about local history.

Gabriel Leigh

Gabriel Leigh

Expert on Finnair

Gabriel is a writer and video creator. As senior content producer for Flightradar24 and Monocle’s transport correspondent, he keeps a close eye on aviation in particular. He has also written travel articles for the likes of The New York Times. Born in New York but raised around the world, he now lives in Sweden. He’s been to 75 countries, flying 2.3 million miles on 113 airlines and through 234 airports in the process.

Jessica Macdonald

Jessica Macdonald

Expert on Lufthansa

Currently based in Scotland after living in South Africa and the United States, Jessica has been writing travel and aviation content for more than 10 years. She regularly contributes to Travel + Leisure and TripSavvy, and has had work published by Condé Nast Traveller and The Independent. She has travelled to more than 50 countries across six continents.

Duncan Madden

Duncan Madden

Expert on British Airways

Duncan is a freelance travel writer, copywriter and book author in constant search of travel stories and the perpetual sensation of being on holiday. He’s never happier than when on a dusty trail in search of empty waves or ducking under the piste tape in search of snowbound solitude. British born, living in Germany, but happiest heading for the horizon. His first book, Found in Translation, explores the etymologies and stories of country names around the world and is out now.

Laura Ratliff

Laura Ratliff

Expert on Virgin Atlantic

Laura Ratliff is a New York-based writer and editor. She lives in downtown Brooklyn with her husband and their beloved dogs. Originally from Texas, she now considers New York City her home. She typically spends more than 200,000 miles on a plane each year and stays in plenty of hotels.

Stefanie Waldek

Stefanie Waldek

Expert on United Airlines and IAD

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or out at sea, likely en route to Antarctica or the Arctic.

Kirstie Pickering

Kirstie Pickering

Expert on LHR

Aviation and business journalist Kirstie didn’t leave England until she was 18 years old, but has since travelled to over 20 countries including Japan, Canada, and Iceland. Her travel expertise lies in European city breaks, including how to find the best locally-owned hotels and restaurants and how to optimise the airport experience for your needs.

Good to know - Cheap tickets from Washington Dulles Airport to London

Low season

February

Cheapest flight

£206
Best time to beat the crowds (21% less expensive on average)
Most popular time to fly (12% more expensive on average)
Flight from Washington Dulles Airport to London Heathrow Airport

When to book flights from Dulles Intl to London

Are your dates flexible? Find out the best times to travel from Dulles Intl to London based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated return price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or returns with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

Flights from Dulles Intl to London: the best tips from KAYAK users' own experiences

Insights shared by verified travellers who flew the route from Dulles Intl to London 
DeeFlew with United Airlines
IAD
-
LHR
Feb 2025
For me the best route to LHR is the late night departure on UAL. The flight is often roughly 6.5 hours so I skip dinner, use an eye mask and earplugs and try to sleep.
EllenFlew with British Airways
IAD
-
LHR
Oct 2024
Do not check your bag if at all possible, especially if you have a connecting flight. Your bag will not make it.
CraigFlew with United Airlines
IAD
-
LHR
Jun 2024
Get to beginning of boarding group early. Bring as little on board as possible due to small overhead bin space.

FAQs for booking Washington Dulles Airport to London flights

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

    In the last 5 days, the lowest price for a flight from Washington, D.C. Dulles Intl Airport to London was £206 for a one-way ticket and £466 for a return.

  • Which airports will I be using when flying from Washington Dulles Airport to London?

    Washington Dulles Airport is served by only 1 airport and there are 4 airports in London. You will leave Washington Dulles Airport from Washington, D.C. Dulles Intl and you will be arriving in London at one of these airports: London City, London Gatwick, London Heathrow, or London Luton.

  • Which airlines offer Wi-Fi service onboard planes from Washington Dulles Airport to London?

    KLM, and American Airlines offer inflight Wi-Fi service on the Washington Dulles Airport to London flight route.

  • Which aircraft models fly most regularly from Washington Dulles Airport to London?

    The Boeing 777 is the aircraft model that flies most regularly on the Washington Dulles Airport to London flight route.

  • Which airline alliances offer flights from Washington Dulles Airport to London?

    SkyTeam, Star Alliance, and oneworld are the airline alliances operating flights between Washington Dulles Airport and London, with SkyTeam being the most commonly used for this route.

  • On which days can I fly direct from Washington Dulles Airport to London?

    There are direct flights from Washington Dulles Airport to London on a daily basis.

  • Which is the best airline for flights from Washington, D.C. to London, Virgin Atlantic or United Airlines?

    The two airlines most popular with KAYAK users for flights from Washington, D.C. to London are Virgin Atlantic and United Airlines. With an average price for the route of £597 and an overall rating of 7.5, Virgin Atlantic is the most popular choice. United Airlines is also a great choice for the route, with an average price of £939 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from Washington Dulles Airport to London?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Washington Dulles Airport to London.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Washington Dulles Airport to London?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London from Washington Dulles Airport is likely to change within 7 days, so travellers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Washington Dulles Airport to London?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly to London with an airline and back to Washington Dulles Airport with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Washington Dulles Airport to London?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to London from Washington Dulles Airport up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Washington, D.C. Dulles Intl Airport to London

  • Looking for a cheap flight from London to Washington Dulles Airport? 25% of our users found flights on this route for £368 or less one-way and £601 or less round-trip.

Prefer to fly direct from Washington Dulles Airport to London?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Washington, D.C. Dulles Intl to London.
Find which airlines fly direct from Washington, D.C. Dulles Intl Airport to London, which days they fly and book direct flights.

Direct departures

Washington, D.C. Dulles Intl to London

Monday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Tuesday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Wednesday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Thursday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Friday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Saturday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Sunday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

See more direct flights

Direct returns

London to Washington, D.C. Dulles Intl

Monday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Tuesday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Wednesday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Thursday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Friday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Saturday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

Sunday

British Airways,United Airlines,Virgin Atlantic

British Airways,United Airlines, +1 more

See more direct flights

Reviews of the top 3 airlines flying from Dulles Intl to London

 
See real verified KAYAK customer reviews for airlines flying from Washington, D.C. to London. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Dulles Intl to London? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.5
Virgin AtlanticOverall score based on 694 reviews
8.1Crew
7.7Boarding
7.5Entertainment
6.9Food
7.3Comfort
Airline reviews

Great staff great experience, made a 2 hour delay very bearable

10.0 ExcellentAnonymous, Oct 2025
LAX - LHR
Read more Virgin Atlantic reviews

Great staff great experience, made a 2 hour delay very bearable

I was my pleasure to fly virgin on my birthday for my first solo trip ever 🫶🏼

Overall, flight was excellent but check in was very slow for Premium Economy. Economy queue was shorter but we weren't allowed to use it.

Good overall. Cannot fault the airlines. I have had better entertainment systems before ie ice in Emirates but it was not too bad. Food was decent and staff were friendly.

Miami airport needs more thorough signage. It was a long walk from my transport point to the check in desk,

Flight took off an hour late. Had to stay on the tarmac for half an hour after landing. Both annoying.

The crew was very good. However, the equipment was a bit dated. Some of the electronics were not working. To top it, three bags didn’t arrive with me. Two of them were delivered a day later. I’m still waiting for the third bag, I was so looking forward to this virgin Atlantic flight, but, I am disappointed.

My only complaint is that the pocket in front of me was ripped and my things, like iPad and airline magazines, kept slipping to the floor.

Flight delayed yet again. Crew apathetic and unhelpful re affect on connecting flight.

The delay was an issue. Other than that. Every thing good

My flight was delayed so bad i missed u it so i just said never mind

Delayed 2 hours while stuck on the aircraft. If the luggage was properly loaded the first time we probably wouldn’t have been delayed at all

1. Everything was satisfactory concerning the flight. 2. Can't think of what could be better right now.

Onboard staff was courteous, helpful, responsive and friendly. The boarding process was disorganized, poorly communicated, and disheveled. Gate agents were yelling instead of using the PA system, didn’t communicate the timing delay of our flight, and created an atmosphere of chaos rather than order and communication. As far as I know, there was no reason for their. I would hate to see how it operated under extreme conditions. I’ve never seen United Airlines operations in such a state.

The flight did not have its customary snacks during the flight. Apparently they were never loaded on the plane.

Worst service- attendants dont want to help and sat us in front of bathroom

We sat on the hot plane for ours with very conflicting messages. Some (most?) of this may be due to the flight control staff, but we were also repeatedly getting "we are leaving"/"we are not" messages. It was very uncomfortable

Very small cramped plane for an international flight. Everything else was good, but it was maybe the smallest comfort-wise I've ever been on for longer than 3-4 hours and the trip was 7.5

The flight was heavily booked so boarding was a lengthy process. The FA’s were rather abrupt during this process but became more gracious as the flight went on. Breakfast (puffed pastry and chewy sausage) was pretty horrible but there was fruit and yogurt which they didn’t mess up. Overall it was fine.

UK Based crew was great. Very friendly and quick. The seats are just too tight and not comfortable. The plane appeared quite old. Food is better on other non-USA based airlines.

Horrible… I was downgraded without notice, had to sit in economy and given my back injury was in pain most of the journey. I expect to be reimbursed for this inconvenience and after my return flight home, I never plan to fly with British Airways again.

I like the crew, very welcoming. Food can be better. The seat arms don’t go up so. I could use the empty seat next to mine to relax better. 3hrs delay 😠

I enjoyed the comfort of Premium Economy. The Purser on London-Nairobi was a little testy, snappish in his tone. I understand stressed, tired, etc but his tone in addressing passengers I found wanting.

The flight was delayed twice and because of that, we missed our connecting flight. British Airways then attempted to put us on the last flight to Milan from London which would have kept us in the airport for 12 hours. We had to speak to several levels of bureaucracy until BA management let us fly on a flight that only kept us in the airport for two hours. If there was an earlier flight, why weren’t we put on that flight from the start? Unacceptable behavior from what was once my favorite carrier.

everything to do with KAYAK was terrible. Your customer facing departments are utterly useless, timewasting and unhelpful.

Nice flight, attentive crew, soft landing by the Pilot,, comfortable seat.

Service was very good. Because I use a cane, I was allowed to use Priority Boarding. Biggest problem was extremely limited leg room in Economy class seats. For airplane food, it was alright.

Great job notifying of 30 minute delay in departure. Fabulous job making up for the time and arriving as scheduled. Air travel is just no fun anymore with the extreme overcrowding, and someone needs to come up with an innovative plan for loading and unloading passengers (load all window seats first, middle seats second, aisle seats last?). Great job getting the luggage on the carousel in record time!

One frustration after another. No gate personnel until very close to departure. Boarding procedure was chaos. Plane was dirty from previous transatlantic flight. Entertainment system not operational. Gate change for connecting flight which required another round of security clearance, almost causing a missed flight. The final blow was lost baggage upon arrival.

Nothing. BA flight was late. Missed connection and lost luggage. A disaster.

Everything you need to know for your flight from Dulles Intl to London

Information on your arrival and departure airports