LON - IAD

£374 Find Cheap Flights from London to Washington Dulles Airport

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from London to Dulles Intl departing on 25/4. 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.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Washington, D.C. Dulles Intl Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to Washington, D.C..
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to Washington, D.C..
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Everything you should know

Cheapest return fare
£399
Typical prices: £512-£654
SWISS, Lufthansa
Wed 1/4Tue 7/4
LHR - IAD • 1 stop
Cheapest direct flights
£404
Typical prices: £515-£692
British Airways
Fri 17/4Wed 22/4
LHR - IAD • Direct
Advice from real travellers
AI-powered summary based on content written by travel experts. AI can make mistakes.
Finnair's Economy Comfort offers more legroom and USB ports.
The Silver Line Metro connects Dulles to central D.C. in 50 minutes.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
Cheapest • from £400 (return)
Best reviews • 7.5 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Direct flights
You can fly direct with British Airways, United Airlines, and Virgin Atlantic. Average duration is 8h 35m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Top routes
Cheapest
Most popular
Insights
Insights
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Insights
Avoid delays
Most punctual • 90% on-time
Best time • Fewest delays
Insights
Insights
Insights
Insights
Top stopover airports
Cheapest • Avg £426 (return)
Shortest trip • 10h 57m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travellers who book at least 5 weeks in advance save around 29% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 11% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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We hope you love your trip to Dulles Intl!
Flight Deals
Booking Insights
Expert advice
Flight Deals

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

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from London to Dulles Intl 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 London to Dulles Intl

Wed, 1 Apr - Tue, 7 Apr
Multiple Airlines Logo
06:00 - 16:45
LHR
-
IAD
15h 45m
1 stop
Multiple Airlines Logo
22:20 - 17:05
IAD
-
LHR
13h 45m
1 stop
£399Multiple Airlines
Wed, 22 Apr - Thu, 14 May
Multiple Airlines Logo
09:30 - 16:05
LHR
-
IAD
11h 35m
1 stop
Multiple Airlines Logo
17:35 - 17:50
IAD
-
LHR
19h 15m
1 stop
£400Multiple Airlines
Fri, 24 Apr - Wed, 29 Apr
Icelandair Logo
15:40 - 19:20
LGW
-
IAD
32h 40m
1 stop
Icelandair Logo
20:30 - 11:45
IAD
-
LGW
10h 15m
1 stop
£400Icelandair
Sat, 18 Apr - Sat, 25 Apr
Air Canada Logo
09:30 - 19:40
LHR
-
IAD
15h 10m
1 stop
Air Canada Logo
09:55 - 06:30
IAD
-
LHR
15h 35m
1 stop
£401Air Canada
Fri, 24 Apr - Wed, 29 Apr
Icelandair Logo
15:40 - 19:20
LGW
-
IAD
32h 40m
1 stop
Icelandair Logo
20:30 - 11:45
IAD
-
LGW
10h 15m
1 stop
£401Icelandair
Fri, 17 Apr - Wed, 22 Apr
British Airways Logo
17:05 - 20:10
LHR
-
IAD
8h 05mdirect
British Airways Logo
19:05 - 07:45
IAD
-
LHR
7h 40mdirect
£404British Airways
Sat, 25 Apr - Sun, 26 Apr
United Airlines Logo
08:45 - 16:45
LHR
-
IAD
13h 00m
1 stop
United Airlines Logo
22:10 - 10:40
IAD
-
LHR
7h 30mdirect
£405United Airlines
Fri, 8 May - Mon, 11 May
Lufthansa Logo
09:15 - 16:05
LCY
-
IAD
11h 50m
1 stop
Lufthansa Logo
22:05 - 17:55
IAD
-
LCY
14h 50m
1 stop
£429Lufthansa
Thu, 14 May - Sun, 17 May
Lufthansa Logo
09:15 - 16:05
LCY
-
IAD
11h 50m
1 stop
Lufthansa Logo
22:05 - 17:55
IAD
-
LCY
14h 50m
1 stop
£442Lufthansa
Wed, 22 Apr - Wed, 29 Apr
British Airways Logo
13:45 - 19:25
LCY
-
IAD
10h 40m
1 stop
British Airways Logo
17:15 - 08:35
IAD
-
LCY
10h 20m
1 stop
£442British Airways
Booking Insights

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

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

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

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

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

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

The cheapest return flight from London to Washington, D.C. Dulles Intl Airport costs £430 on the route between London Heathrow Airport (LHR) and Washington, D.C. Dulles Intl Airport (IAD). It is also the most popular route.

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

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

Your flight ticket price will generally be cheaper if you fly to Washington Dulles Airport on a Thursday and more expensive on a Sunday. On your return trip to London, you should consider flying back on a Sunday, and avoid Thursdays for better deals.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from London to Washington, D.C. Dulles Intl Airport, 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 London to Washington, D.C. Dulles Intl Airport is September, where tickets cost £486 (return) on average. On the other hand, the most expensive months are July and August, where the average cost of round-trip tickets is £623 and £608 respectively.

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

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.

No, with an average price for the route of £516, prices are generally cheapest when you fly direct.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from London to Washington, D.C. Dulles Intl Airport, 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 London to Washington, D.C. Dulles Intl Airport, you should book around 5 weeks before departure, which saves you about 29% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 22 weeks before departure.

Expert advice

Expert advice for your flight from London to Dulles Intl

 
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
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.

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.

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.

Tara Craig

Tara Craig

Expert on Austrian Airlines

Tara Craig has been a journalist for 17 years, focusing on aviation for more than a decade. She has covered everything from how airports accommodate disabled passengers to the emergence of electric air taxis. Tara is constantly travelling and finds it hard to stop noticing things – good and bad – about the air travel experience.

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.

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.

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 London to Washington Dulles Airport

Low seasonJanuary
Cheapest flight£374
Best time to beat the crowds (10% less expensive on average)
Most popular time to fly (14% more expensive on average)
Flight from London Heathrow Airport to Washington Dulles Airport

When to book flights from London to Dulles Intl

Are your dates flexible? Find out the best times to travel from London to Dulles Intl 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.

FAQs for booking London to Washington Dulles Airport flights

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

    In the last 3 days, the lowest price for a flight from London to Washington, D.C. Dulles Intl Airport was £374 for a one-way ticket and £399 for a return.

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

    When flying out of London you will be using one of these airports: London Gatwick, London Heathrow, London Southend, or London Stansted. You will be landing at Washington, D.C. Dulles Intl.

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

    Only KLM offers inflight Wi-Fi service on the London to Washington Dulles Airport flight route.

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

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

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

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

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

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

  • Which is the best airline for flights from London to Washington, D.C., KLM or Austrian Airlines?

    The two airlines most popular with KAYAK users for flights from London to Washington, D.C. are KLM and Austrian Airlines. With an average price for the route of £604 and an overall rating of 7.8, KLM is the most popular choice. Austrian Airlines is also a great choice for the route, with an average price of £554 and an overall rating of 7.6.

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

    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 London to Washington Dulles Airport.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Washington Dulles Airport from London 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 London to Washington Dulles Airport?

    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 Washington Dulles Airport with an airline and back to London with another airline.

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

    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 Washington Dulles Airport from London 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 London to Washington, D.C. Dulles Intl Airport

  • Looking for a cheap flight from Washington Dulles Airport to London? 25% of our users found flights on this route for £541 or less one-way and £488 or less round-trip.

Prefer to fly direct from London to Washington Dulles Airport?

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

Direct departures

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

Direct returns

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

Reviews of the top 5 airlines flying from London to Dulles Intl

 
See real verified KAYAK customer reviews for airlines flying from London to Washington, D.C.. 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 London to Dulles Intl? 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 680 reviews
7.3Comfort
7.6Entertainment
8.2Crew
7.7Boarding
6.9Food
Airline reviews

My seat 3G did not go down fully and the buttons were not working properly

8.0 ExcellentAditya, Feb 2026
LHR - JFK
Read more Virgin Atlantic reviews

My seat 3G did not go down fully and the buttons were not working properly

Food has been disappointing in both legs of flight to india

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

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

Food was the worst I’ve had on a VA flight. Normally it’s a lot better

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

These are one of the older seat arrangements facing away from the windows! Not particularly convenient sets. No storage spaces. NO COAT HANGING HOOKS. Inconvenient business class seat compared to any other airlines of similar class. Staff are excellent! Extremely professional, friendly. Food is good too.

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.

The staff was not very polite but the flight was very very nice and comfortable and the entertainment was great

Great crew - old style upper class seats on the older fleet now feels dated

All aspects were excellent - it helped that the flight was only 2/3 full and I had no one sitting in my row. The Pre-check (US Passport Control and Customs) in Dublin made everything so easy when we arrived in Chicago.

I love the direct flights. It saves a lot of hassle and allows immigration and customs in Ireland, making arrival much easier.

One of the best flight experiences I've have had in along time. Would fly with them again.

Like getting a bus. No great luxury but will get you there

Got us to destination alive, albeit a bit late. Luggage was left behind. No live tracking app available (available on some other airlines). Supposedly going to be delivered in next couple of days.

So, the trip from Dublin to LA did not really happen because the flight took off before we could finish the transfer.

Very nice experience. Flight had good entertainment system and good food options. Customer service was very friendly and nice as well.

The connection time between the regional flight (from Newcastle) to an international flight (to The States) was too short. To require as second security scan and customs clearance within an hour and 20 mins is not enough time to make the actual connection. We had a final boarding call the minute we walked out of US customs and had to sprint (with two small children) through 20 gates to make it in time before the door closed. The concept is great in theory to clear customs before leaving Europe, but the timing needs to be adjusted. We travel abroad frequently and won’t be using this route again. Thanks.

Like - the crew were nice Dislike - sitting on the tarmac for long periods after boarding and landing.

I was not admitted to the flight!!! i need a refund for this.

Iceland Air severely damaged a checked bag. Additionally, the gate agent caused issues for many passengers who had standard-sized onboard bags that would have passed inspection by any other airline.

The staff was kind and helpful. There was no food, and you needed to bring your own earphones to use the entertainment, which I didn’t know.

They wouldn’t check in my luggage even though I had one checked bag prepaid. So I took my bag to the gate and tried to check it in there and two employees scolded me for bringing a large bag to the gate. I told them I was trying to check it in and that it was prepaid, and they said they couldn’t guarantee that it would arrive at my destination but they finally let me drop it off when boarding the plane and pick it up right after exiting the plane. There was no food, and there was no entertainment.

Overall satisfied and would fly with them again. They could improve the check-in efficiency at BOS, we got backed up because it seemed there were passengers requiring much more time for check in.

The customer service was unbeatable from the wheelchair assist team to the flight attendants. The pilot also did an excellent job managing the turbulence.

Problems checking in both on the laptop and on the app. No free seating available at check-in as advertised - must pay for EVERY seat between $23 and $75. No way to cancel seat choice. App menus and site menus are not responsive, and some items are impossible to find. Crew and mobile assistance are friendly and helpful.

Food - Non-Existent. You pay for everything. It is strictly Pay-to-Play!

Again, we paid $ 328.00 for specific seats are were assigned those seats.

Having been prepared for paying for everything on board other than water, coffee and tea the service was OK. Food and drink is expensive but the food was OK if limited in scope. Plane was clean and obviously well serviced. After complaining about having to walk in wind and rain to a get a bus to the airport the same thing happened at Portland. I’m sure you could get a terminal gate flight, complimentary food and drink for not much more money without traipsing through rain and slush in Reykjavik. Not bad but not great.

If there was a disclaimer regarding food service or lack thereof, l missed it. If l had known l would have prepared better. Same with transferring at Reykjavik. No information about disembarking via stairs into rain, slush and puddles deep enough to swallow a foot. After being treated to haute cuisine restaurants and warm inviting environment during the flight, the airport is, let’s be kind, disappointing. Plane was comfortable, Airbus, staff were welcoming enough. I would likely try the route again. Maybe have a night and day in Iceland. Maybe not.

Flight map did not work. Crew was great, food was good, plane took off on time and landed early. That's all I can ask.

Bulkhead seats should not be an extra charge. They are extremely uncomfortable. And we missed our connecting flight due to slow luggage retreaval.

Lufthansa flight LH04414 from Munich to Washington DC, was fine. Efficient and safe!

Bumpy ride, not Lufthansa‘s fault. Crew managed a situation over a back rest to far down well. It was two iles behind me. The person putting the seat down, against the other person’s knees, was quite rude and belligerent and needed to be told in a no nonsense matter to stopp. Male flight attendant did good job.

Had a few open seats and could use it for a great rest ful journey

It was very good. Service was friendly and efficient, and food was good.

Paid for exit row at the back of the plane. Window seat with lots of leg space. Food was inedible (as usual). Brought my own.

We left 1.5 hours late therefore missing my connection. The airline didn’t give vouchers.

Food could have something without dairy, I couldn't eat anything. Tv for both seats was malfunctioning. They have one bottle of ginger ale for entire plane.... and I paid extra for these seats...very disappointed

We took two long flights with Lufthansa, both were delayed making us miss our connecting flights. Lufthansa took care of the first one. The second was a switch to United and figuring out how to rebook was not a pleasant experience.

Late takeoff, but on time landing. Lost bags, 3 days to find them, still in transit to my location. Power outlets broken, Wi-Fi not working, so much for working on the long flight.

Good. For a long flight. The comfort of the seat could be better. Also, the food was « normal » plane food. Not indian plane food unfortunately! Everything else was smooth and great.

The seats were comfortable. So many empty seats allowed for stretching out and sleeping. The onboard entertainment was pretty good. The cabin crew were so kind and kept the passengers well- hydrated, and well fed.

We had American Airlines on our return and it was confusing if we were going with Aa or BA I had 2 different flight numbers and didn’t get our gate until it was boarding. So we were a bit nervous as the which it was

My touch screen at my seat wasn't working, the films BA advertised on the website for this flight were not available, and the plane was a little dated, food was good and the staff were good, just let down by the aircraft facilities.

Did not like the seating configuration at all with 2+3+2 in business class. Lacking total privacy and comfort

Check-in experience, for business call please provide a premium experience

Lost my luggage, ran out of food choices in business class, ground crew was completely unapologetic.

Excellent. The crew and flight were great. Checking in was easy and everyone was very helpful.

Entertainment devices on A380 need to be fixed, the seats might do with updates.

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

Information on your arrival and departure airports