LON - IAD

$508 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 2/12. 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..
Travelers love KAYAK
41.299.237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$543
Typical prices: $604-$754
Austrian Airlines
Sun 2/22Thu 3/5
LHR - IAD • 1 stop
Cheapest non-stop
$557
Typical prices: $642-$796
British Airways
Fri 3/13Fri 3/20
LHR - IAD • Non-stop
Our travelers' advice
AI-powered summary based on content written by travel experts. AI can make mistakes.
American Airlines' Main Cabin Extra includes early boarding.
Use the Silver Line Metro for easy access to downtown D.C.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
Austrian Airlines
Cheapest • from $543 (round-trip)
Austrian Airlines
Best reviews • 7.5 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Top routes
LHR
-
IAD
Cheapest
LHR
-
IAD
Most popular
Insights
Insights
Insights
Insights
When to book
4 weeks
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 30% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
September
Cheapest • 12% price drop
July
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
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 round-trip 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 round-trip flight deals from London to Dulles Intl

Sun, Feb 22 - Thu, Mar 5
Austrian Airlines Logo
6:00 am - 2:40 pm
LHR
-
IAD
13h 40m
1 stop
Austrian Airlines Logo
6:20 pm - 6:40 am
IAD
-
LHR
7h 20mnonstop
$543Austrian Airlines
Fri, Feb 27 - Tue, Mar 3
TAP AIR PORTUGAL Logo
10:40 am - 9:00 pm
LGW
-
IAD
15h 20m
1 stop
TAP AIR PORTUGAL Logo
5:30 pm - 9:50 am
IAD
-
LGW
11h 20m
1 stop
$543TAP AIR PORTUGAL
Fri, May 22 - Sun, May 31
Icelandair Logo
3:40 pm - 10:15 pm
LGW
-
IAD
11h 35m
1 stop
Icelandair Logo
11:20 pm - 2:40 pm
IAD
-
LGW
10h 20m
1 stop
$544Icelandair
Wed, Feb 25 - Tue, Mar 3
Austrian Airlines Logo
9:05 am - 2:40 pm
LHR
-
IAD
34h 35m
1 stop
Austrian Airlines Logo
10:15 pm - 10:50 am
IAD
-
LHR
7h 35mnonstop
$544Austrian Airlines
Wed, Feb 18 - Sat, Feb 28
Icelandair Logo
11:55 am - 6:30 pm
LGW
-
IAD
11h 35m
1 stop
Icelandair Logo
7:40 pm - 10:55 am
IAD
-
LGW
10h 15m
1 stop
$545Icelandair
Wed, Feb 18 - Sat, Feb 28
Austrian Airlines Logo
2:50 pm - 2:40 pm
LHR
-
IAD
28h 50m
1 stop
Austrian Airlines Logo
5:17 pm - 11:15 am
IAD
-
LHR
12h 58m
1 stop
$545Austrian Airlines
Tue, Feb 17 - Sun, Feb 22
Multiple Airlines Logo
9:00 am - 4:40 pm
LHR
-
IAD
12h 40m
1 stop
Multiple Airlines Logo
10:15 pm - 10:50 am
IAD
-
LHR
7h 35mnonstop
$546Multiple Airlines
Sat, Feb 21 - Tue, Mar 3
United Airlines Logo
7:30 am - 2:35 pm
LHR
-
IAD
12h 05m
1 stop
United Airlines Logo
5:40 pm - 8:25 am
IAD
-
LHR
9h 45m
1 stop
$548United Airlines
Tue, Feb 10 - Tue, Feb 17
Lufthansa Logo
7:40 am - 3:35 pm
LHR
-
IAD
12h 55m
1 stop
Lufthansa Logo
5:40 pm - 5:05 pm
IAD
-
LHR
18h 25m
1 stop
$552Lufthansa
Thu, Feb 26 - Thu, Mar 5
Multiple Airlines Logo
2:00 pm - 7:20 am
LGW
-
IAD
22h 20m
1 stop
Multiple Airlines Logo
10:10 am - 10:00 am
IAD
-
LGW
18h 50m
1 stop
$563Multiple Airlines
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 round-trip flight from London to Washington, D.C. Dulles Intl Airport?

This analysis is based on the cheapest round-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 February.

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 $539 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.

If your flying dates are flexible, you should consider flying to Washington Dulles Airport on a Thursday, as we generally find the cheapest rates on that day for this route. On the other hand, Tuesday is the most expensive day to fly from London to Washington Dulles Airport. For your return ticket, we recommend flying on a Wednesday and avoiding Saturdays for the best 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 $653 (return) on average. On the other hand, the most expensive months are July and August, where the average cost of round-trip tickets is $889 and $820 respectively.

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

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

No, with an average price for the route of $607, 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 4 weeks before departure, which saves you about 30% 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 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
Stefanie Waldek

Stefanie Waldek

Expert on Delta, 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 on the sea, likely en route to Antarctica or the Arctic.

Marisa Garcia

Marisa Garcia

Expert on Iberia

Marisa knows planes inside and out, spending 16 years working on aircraft in hangars at airports around the world. She is an aviation industry expert, specialized in airline interiors and regulations. Ten years ago, she pivoted to journalism. She shares her insights in leading aviation, travel, and business publications and on her site FlightChic.

Duncan Madden

Duncan Madden

Expert on British Airways and LHR

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.

Harriet Baskas

Harriet Baskas

Expert on American Airlines

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Good to know

Low seasonJanuary
Cheapest flight$508
Best time to beat the crowds with an average 8% drop in price.
Most popular time to fly with an average 19% increase in price.
Flight from London Gatwick 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 round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips 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 $508 for a one-way ticket and $543 for a round-trip.

  • Do I need a passport to fly between London and Washington Dulles Airport?

    A passport is required to fly from London to Washington Dulles Airport.

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

    London has 5 major airports: London City, London Gatwick, London Heathrow, London Luton, and London Stansted. Washington, D.C. Dulles Intl is the only airport in Washington Dulles Airport. You’ll usually find the cheapest deals if you fly from London Gatwick Airport.

  • 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?

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

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

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

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

    The two airlines most popular with KAYAK users for flights from London to Washington, D.C. are Virgin Atlantic and Austrian Airlines. With an average price for the route of $803 and an overall rating of 7.5, Virgin Atlantic is the most popular choice. Austrian Airlines is also a great choice for the route, with an average price of $824 and an overall rating of 7.5.

  • 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 travelers 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 round-trip 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? 25% of our users found flights on this route for $673 or less one-way and $572 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 serving 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
Austrian AirlinesOverall score based on 895 reviews
6.8Food
6.8Entertainment
7.3Comfort
8.1Crew
7.6Boarding
Airline reviews

My Austrian Air flight from Montenegro to Vienna was delayed by three hours because their plane de-icer was broken and they had to wait for the sun to come up before the ice could melt. This meant we missed our United flight altogether. So I can't speak about United, but I was not impressed by Austrian Air. They made us check in two carry on bags for a 60% full flight, and the bags didn't find us in the US for ten days. The re-routing they arranged included an extra leg, a midnight taxi ride across New Jersey and New York, and a five hour sleep in a hotel. Not impressed.

2.0 MediocreNate, Jan 2026
GSP - IAD
Read more Austrian Airlines reviews

My Austrian Air flight from Montenegro to Vienna was delayed by three hours because their plane de-icer was broken and they had to wait for the sun to come up before the ice could melt. This meant we missed our United flight altogether. So I can't speak about United, but I was not impressed by Austrian Air. They made us check in two carry on bags for a 60% full flight, and the bags didn't find us in the US for ten days. The re-routing they arranged included an extra leg, a midnight taxi ride across New Jersey and New York, and a five hour sleep in a hotel. Not impressed.

Most of the crew members were rude, flight arrived late and we missed our connecting flight, they damaged my friends suitcase so badly that two wheels had been destroyed.

Excellent flight. The crew was exceptionally attentive and organized. Attention to details is unmatched.

Loved the courtesy and punctuality. Very professional and most importantly on time.

Great! They got my vegetarian meal right, flight was comfortable, they helped store my heavy luggage. Pleasant crew and flight staff.

I did wish they would give us the entire little bottle Bailey's instead of just have 1/2 bottle at a time

Very limited legroom in a 10 hour flight.very old plane.

They had me unpack a handbag 2 lbs overweight into another handbag 8 lbs underweight for a Bible.

My flight was canceled and even though I paid אם KAYAK you didn't even answer me and obviously didn't refund my money. I will never buy a ticket through you again.

Accessibility serious problems in Viena airport making it seriousely difficult in in-between gates and boarding travel. Pretens of breakfast and service care in the economy pathetic.

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

Premium economy more comfortable than economy, but not by much. Did was awful, do not try the omelette. Flight crew were helpful. Flight was delayed by over an hour. Overall but bad, arrived safely and thank God.

Good crew. Boarding delays. Almost two hours wait for the bags in DC.

Unfortunately weather delayed our flight waiting for our plane to arrive and due to a little snow time was needed to deice the plane so departure was very delayed and I missed the connecting flight

It was great. There were some issues prior to takeoff. The weather was poor so we had to go through deicing, and we were delayed a bit by the pilots' concern about one of the engines, but that's aviation. The pilots handled everything with aplomb, and kept us apprised

The seats were comfortable and we had leg room. Great entertainment.

The flight crew where really good. Better then the crew from BNE to SFO

Safe made to destination. Late to start at GVA for icy reasons but we fought our next fly.

Miserable. They moved my seat, but canceled the next leg of my flight. I resolved the issue at my transfer, but that resulted in lost luggage that has taken days off my schedule with no resolution. Worse, they fail to interface effectively with Lufthansa, forcing me to bounce between two equally useless help desks. The apps are unable to handle the situation, the bag dropped off the tracker, and while the call centers are polite, they do not provide written information to assist with cross-airline communication.

l really enjoy very much the flight was very pleasant

The flight was delayed for 1:30 hours for maintenance issues. They should give more information about connecting flights. For a Business Cabin the Crew was mediocre.

The food is terrible. The same pasta or chicken with bad taste and presentation

The flight attendant use 1.5 hours to answer my call. My dirty food tray was unattended.

The flight was completely full. Crew was not happy. Everyone was rude and brusque. Travelling with an arm in a cast and seating in the first row of economy cabin (in front of the separation) I needed help retrieving my tray for the meal. A staff member literally threw the tray on my lap, without helping to take out the tray. Boarding was messy, with 300 people waiting in an encloses space with low ceiling. I will try to avoid AA next time I have a long flight.

Concern Regarding Significant Gate Delay and Jet Bridge Issue Dear Customer Relations Team, I am writing to express my disappointment with the experience I had on my recent flight AA 2414 on Sunday January 18, 2026. What should have been a routine departure turned into a frustrating and avoidable delay due to an issue with the jet bridge at the gate. As a result, the flight was delayed by approximately 90 minutes while multiple gate changes were attempted. The lack of clear communication during this period made the situation even more challenging. Passengers were left uncertain about the cause of the delay, the expected timeline, and the next steps. This not only disrupted travel plans but also created unnecessary stress for everyone on board. I understand that operational issues can arise, but a malfunctioning jet bridge and the resulting extended delay suggest an area where procedures or equipment maintenance may need attention. I hope you will review this incident to prevent similar disruptions in the future. I would appreciate acknowledgment of this concern and consideration of appropriate compensation for the inconvenience and lost time caused by this delay. Thank you for taking the time to review my experience. I look forward to hearing from you. Sincerely, Dion Dillard

I got sick nothing contagious but distressing enough and the care I received on the flight was astounding.

Horrible. Both legs of my flight were delayed more than 6 hours. No compensation, no screens on the plane, and the plane was not clean.

The business class seats are dated and uncomfortable. The space is bare minimum and there is absolutely no privacy. For $4K, this is not what I expect.

After we'd boarded , they canceled the flight. The crew didn't even know , we just all received text messages. Then after they deplaned us , AA was just like "too bad, go F your self, we sure ain't gonna help you"

Initial flight was cancelled at the time of arrival to the airport, flight alternative requires switching from direct to flight with a layover, and the plane felt like it would split apart, it was so rattle-y.

Weather delay for 2.5 hours followed by half hour crew delay, did not have ginger ale, uncomfortable seats

It was nobody’s fault - but the plane came 4-hrs late and we were updated randomly in 20-30 mins increments which left us hostage to sit and wait expectantly. It was very long and got very late. Our plane didn’t land until nearly 1 am! Also the toilet wasn’t working. The hosts were nice enough but were clearly “about to pass out” as one told me. Lastly, there was no snack or even time for it. Just a bad experience overall.

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. Employees offered to help me because I had to use a cane.

Check-in and boarding were great. On flight staff were rude and disrespectful. Paid for extra room and found it incredibly cramped. Bathrooms kept in poor condition. Overall negative experience.

Great seat in premium economy, great food and drinks throughout lots of in flight entertainment. 1 hour 40 min delayed flying out , 2 1/2 hour wait at passport control in tampa

My seat cushion was poor. The cushion was compressed and was uncomfortable for such a long flight.

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

Information on your arrival and departure airports