IAD - LON

£301 Find Cheap Flights from Washington Dulles Airport to London

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 21/10. 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 London

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

Cheapest return fare
£664
Typical prices: £378-£373
TAP AIR PORTUGAL
Sat 12/9Fri 18/9
IAD - LGW • 1 stop
Cheapest direct flights
£666
Typical prices: £784-£505
Iberia
Tue 24/11Tue 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
Expert advice
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Top airlines
Cheapest • from £664 (return)
Best reviews • 7.5 score
Airline reviews
Airline reviews
+1
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Airline reviews
Airline reviews
+1
Direct flights
You can fly direct with British Airways, United Airlines, and Virgin Atlantic. Average duration is 7h 28m
Direct flights
Direct flights
+1
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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 • 85% on-time
Best time • Fewest delays
Insights
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Top stopover airports
Cheapest • Avg £331 (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 3 weeks in advance save around 21% compared to booking last minute.
Insights
Insights
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Insights
When to travel
Cheapest • 54% price drop
Most popular
Good to know
Good to know
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Good to know
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We hope you love your trip to London!
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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

Sat, 12 Sep - Fri, 18 Sep
TAP AIR PORTUGAL Logo
17:05 - 09:45
IAD
-
LGW
11h 40m
1 stop
TAP AIR PORTUGAL Logo
21:15 - 15:10
LGW
-
IAD
22h 55m
2 stops
£664TAP AIR PORTUGAL
Mon, 3 Aug - Thu, 13 Aug
Delta Logo
22:55 - 11:20
IAD
-
LHR
7h 25mdirect
Delta Logo
08:40 - 15:35
LHR
-
IAD
11h 55m
1 stop
£664Delta
Tue, 28 Jul - Fri, 21 Aug
Virgin Atlantic Logo
17:40 - 09:30
IAD
-
LCY
10h 50m
1 stop
Virgin Atlantic Logo
07:45 - 00:34
LCY
-
IAD
21h 49m
2 stops
£665Virgin Atlantic
Wed, 30 Sep - Wed, 7 Oct
Air Canada Logo
12:35 - 10:00
IAD
-
LHR
16h 25m
2 stops
Air Canada Logo
12:05 - 20:25
LHR
-
IAD
13h 20m
1 stop
£665Air Canada
Fri, 17 Jul - Wed, 22 Jul
Multiple Airlines Logo
09:45 - 19:20
IAD
-
STN
28h 35m
2 stops
Multiple Airlines Logo
06:30 - 20:24
STN
-
IAD
18h 54m
2 stops
£665Multiple Airlines
Sat, 19 Sep - Sat, 3 Oct
Multiple Airlines Logo
23:20 - 18:55
IAD
-
LTN
14h 35m
2 stops
Multiple Airlines Logo
12:45 - 19:00
LTN
-
IAD
35h 15m
2 stops
£665Multiple Airlines
Sun, 30 Aug - Sat, 12 Sep
Icelandair Logo
20:30 - 14:40
IAD
-
LGW
13h 10m
1 stop
Icelandair Logo
15:40 - 22:15
LGW
-
IAD
11h 35m
1 stop
£666Icelandair
Wed, 30 Sep - Tue, 13 Oct
Virgin Atlantic Logo
11:00 - 08:50
IAD
-
LCY
16h 50m
2 stops
Virgin Atlantic Logo
10:00 - 21:12
LCY
-
IAD
16h 12m
2 stops
£667Virgin Atlantic
Sat, 4 Jul - Sat, 11 Jul
Icelandair Logo
20:30 - 20:20
IAD
-
LHR
18h 50m
1 stop
Icelandair Logo
21:25 - 19:20
LHR
-
IAD
26h 55m
1 stop
£667Icelandair
Mon, 10 Aug - Thu, 20 Aug
Air Canada Logo
17:34 - 10:00
IAD
-
LHR
11h 26m
1 stop
Air Canada Logo
08:30 - 19:01
LHR
-
IAD
15h 31m
2 stops
£668Air Canada
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.

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 £661 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 Thursday 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 January, where tickets cost £310 (return) on average. On the other hand, the most expensive months are May and June, where the average cost of round-trip tickets is £1,375 and £1,072 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 £718 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 3 weeks before departure, which saves you about 21% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 10 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 seasonFebruary
Cheapest flight£296
Best time to beat the crowds (18% less expensive on average)
Most popular time to fly (10% more expensive on average)
Flight from Washington, D.C. to London Gatwick 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 3 days, the lowest price for a flight from Washington, D.C. Dulles Intl Airport to London was £301 for a one-way ticket and £664 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 £572 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 £931 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 £365 or less one-way and £811 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 689 reviews
7.7Boarding
6.9Food
7.3Comfort
8.1Crew
7.5Entertainment
Airline reviews

Seating and zone. The minor I went with didn’t even seat close to me

4.0 OkayAnonymous, Mar 2026
BOS - LIS
Read more Virgin Atlantic reviews

Seating and zone. The minor I went with didn’t even seat close to me

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

Our flight was canceled same day and we were never informed. Had to pay more and worse seating on another airline.

Did not like that we couldn't complete check in on-line without providing pictures of our passports. Worry about identity theft. We had no delays and boarding was handled In an efficient manner.

Excellent! I got to Munich and was transferred to my Lufthansa flight quickly, in 15 to 20 minutes, so I did not miss my flight. However, I had checked my overhead bag at the boarding gate in Tampa. That got to Tunis the next day. That is to be expected.

WiFi didn’t exist , seats were super cramped, lights stayed on near my seat for a long time while others were dimmed, the food/trash/drink cart hit my shoulder at least a couple of times while moving, food options were down to just one option by the time it got to my row, the utensils were garbage (knife bent at a couple of places by the time I was done eating) the spoon was very flimsy plastic

Cree was organized and pleasant. Plane had good seating but as it’s a shuttle toilets hadn’t been thoroughly cleaned (eg. bins too full)

Vegetarian selection could be better. Bread was too hard to chew.

Crew was friendly and competent. Food, wine, and entertainment were excellent except the raw tuna on the flight to Split. Recommend against serving that - at least as the only option. Many medical conditions do not allow people to eat raw fish.

United didn’t even try to hold the flight for me. They knew I had a tight connection and when I arrived at the gate less than 10 mins after final boarding the flight had already gone. The gate agent wasn’t even notified that I was on my way. She was told I wasn’t at the airport

Good quick flight on a small but comfortable plane. I'm 6'3 and had plenty of space.

The flight was delayed so we were dead tired, and after that the turbulence was horrible. I was very scared.

Boarding process was chaotic. Confusion over Boarding gates: gate 55 or gate 56 ???. Unnecessary standing in long lines to board. Better to call out Boarding groups one at a time and everyone else to sit. Airline only has 2 Boarding groups 1-3 and 4-9. That causes over crowding and chaos

Lady next to me was coughing profusely the entire flight, other lady moved seats because of it, 8 hours of that during an overnight flight is a bit much.

3.5 hr delay leaving Pittsburgh, notifications for which were incomplete and untimely. Connecting flight was automatically switched to one requiring more than a 30 hour layover! After waiting in a long queue, customer service reduced layover to 11 hours and also set up an earlier standby. The standby had empty seats, but the gate agent couldn't change our tickets! On top of all that my luggage was lost and has yet to even be located, much less returned 5 (FIVE!) days later. Too bad there's no rating below poor.

Canceled flight late London to Florence. Help at airport very poor. Treated poorly. Had to sleep in the airport. Lost bags- still do not have them. Horrible. I should be reimbursed!

The seats are extra cramped if you are taller than 5’8! Spring for the extra legroom seats for sure if you have a long flight!

Very disappointed with British Airways. It has been over 24 hours and I still have not received my checked baggage or any proper update. Customer support has been unresponsive, making the situation even more frustrating. Poor baggage handling and lack of communication seriously impacted my travel experience.

Flight was good but temp in the cabin was cold.

I like American Airlines and their safety record. They provide quality service and a feel safe enough to prefer American Airlines over other carriers even if I have to pay a little more.

Cancelled flight and re booked seats were a downgrade. British Airways said the upgrade was t available but when I checked it was but then they wouldn’t make it right

Boarding was orderly, pilot and flight attendants were nice, entertainment options were good, and low sodium meals were quite tasty.

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

Information on your arrival and departure airports