LON - IAD

$558 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 6/7. 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 round-trip
$577
Typical prices: $734-$579
Icelandair
Sat 9/5Thu 9/10
LHR - IAD • 1 stop
Cheapest non-stop
$588
Typical prices: $877-$657
British Airways
Fri 8/21Sat 9/12
LHR - IAD • Non-stop
Advice from real travelers
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
Cheapest • from $577 (round-trip)
Best reviews • 7.6 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
You can fly direct with British Airways, United Airlines and Virgin Atlantic. Average duration is 8h 20m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Top routes
Cheapest
Most popular
Insights
Insights
Insights
Insights
Avoid delays
Most punctual • 89% on-time
Best time • Fewest delays
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $542 (round-trip)
Shortest trip • 11h 20m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 6 weeks in advance save around 34% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 46% 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
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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

Sat, Sep 5 - Thu, Sep 10
Icelandair Logo
1:05 pm - 10:15 pm
LHR
-
IAD
14h 10m
1 stop
Icelandair Logo
8:30 pm - 8:20 pm
IAD
-
LHR
18h 50m
1 stop
$577Icelandair
Thu, Oct 1 - Sun, Oct 4
Icelandair Logo
3:40 pm - 7:20 pm
LGW
-
IAD
32h 40m
1 stop
Icelandair Logo
11:20 pm - 2:40 pm
IAD
-
LGW
10h 20m
1 stop
$580Icelandair
Thu, Oct 1 - Sun, Oct 4
Icelandair Logo
9:25 pm - 10:15 pm
LHR
-
IAD
29h 50m
1 stop
Icelandair Logo
8:30 pm - 11:55 am
IAD
-
LHR
10h 25m
1 stop
$581Icelandair
Sun, Jul 19 - Tue, Jul 28
British Airways Logo
5:05 pm - 8:20 pm
LHR
-
IAD
8h 15mnonstop
British Airways Logo
10:25 pm - 10:50 am
IAD
-
LHR
7h 25mnonstop
$583British Airways
Fri, Aug 21 - Sat, Sep 12
British Airways Logo
12:35 pm - 3:55 pm
LHR
-
IAD
8h 20mnonstop
British Airways Logo
10:25 pm - 10:50 am
IAD
-
LHR
7h 25mnonstop
$588British Airways
Thu, Jul 2 - Mon, Jul 13
Delta Logo
11:45 am - 6:32 pm
LHR
-
IAD
11h 47m
1 stop
Delta Logo
10:21 am - 6:25 am
IAD
-
LHR
15h 04m
1 stop
$594Delta
Wed, May 20 - Tue, May 26
Multiple Airlines Logo
9:15 am - 10:15 pm
LTN
-
IAD
18h 00m
2 stops
Multiple Airlines Logo
8:30 pm - 8:05 pm
IAD
-
LTN
18h 35m
2 stops
$673Multiple Airlines
Mon, Jun 15 - Mon, Jun 22
Multiple Airlines Logo
8:30 am - 7:15 pm
STN
-
IAD
15h 45m
1 stop
Multiple Airlines Logo
9:00 pm - 9:20 pm
IAD
-
STN
19h 20m
1 stop
$679Multiple Airlines
Thu, Sep 3 - Sun, Sep 13
Virgin Atlantic Logo
8:25 am - 3:35 pm
LCY
-
IAD
12h 10m
1 stop
Virgin Atlantic Logo
5:40 pm - 9:30 am
IAD
-
LCY
10h 50m
1 stop
$682Virgin Atlantic
Thu, Sep 3 - Sun, Sep 13
Virgin Atlantic Logo
9:20 am - 4:25 pm
LCY
-
IAD
36h 05m
2 stops
Virgin Atlantic Logo
5:40 pm - 9:30 am
IAD
-
LCY
10h 50m
1 stop
$693Virgin Atlantic
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 September.

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 $670 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, Sunday 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 January, where tickets cost $432 (return) on average. On the other hand, the most expensive months are March and April, where the average cost of round-trip tickets is $1,177 and $1,159 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 $758, 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 6 weeks before departure, which saves you about 34% 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
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$558
Best time to beat the crowds with an average 8% drop in price.
Most popular time to fly with an average 11% increase in price.
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 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 $558 for a one-way ticket and $577 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 Heathrow 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., Austrian Airlines or Virgin Atlantic?

    The two airlines most popular with KAYAK users for flights from London to Washington, D.C. are Austrian Airlines and Virgin Atlantic. With an average price for the route of $827 and an overall rating of 7.6, Austrian Airlines is the most popular choice. Virgin Atlantic is also a great choice for the route, with an average price of $784 and an overall rating of 7.4.

  • 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 $758 or less one-way and $753 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.
7.6
Austrian AirlinesOverall score based on 914 reviews
8.1Crew
6.8Entertainment
7.6Boarding
6.8Food
7.3Comfort
Airline reviews

Last few years I didn't not have great experience with United Airlines.

2.0 MediocreAnonymous, Apr 2026
IAD - PHX
Read more Austrian Airlines reviews

Last few years I didn't not have great experience with United Airlines.

The airport gate in Lyon was an insult to human dignity…. Shame kn the French authorities

Booked economy. Seat felt like it was a bit more roomy than my last trans Atlantic flights. I had a nice person sitting next to me. Everything was as good as it could be considering you are 35,000 feet up in the air and in a metal container. Beers, wine, food were all readily available. Plenty of movies and shows to watch. Friendly flight staff

Short flight. Bare bones and kinda seeming like an older plane. But got me there on time and that's what counts. Perfectly fine flight all the way from start to finish.

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

Was great in general, try to respect time and excuses when slight changes have been made, appreciated!

Terrific in every way. On time, professional staff, multiple movie options to select, great food and drink.

My bags were misplaced!!! Im in a foreign country with no bags

I liked that it was on time, however, the food was not good.

Offered to check carry on to final destination. This is the most absurd thing in the world. I'm carrying on because I need what is in the carry-on. I'm okay with picking up at next stop but then I will be on much larger plane that can accommodate it. Also, if there is ever a change to your flight. Go to the airport and have the people there fix your ticket. Don't do it over the phone or online with United they screwed us up and ended up with flights for our last leg that took off before our first leg.

United is one airline which regardless of how many separate United tickets in existence, if one flight breaks down, the airline will take care of all the flights.

It was okay, the food was good, but after the landing there was not enough time for luggage and security to catch a connection. It was crowded on board.

When I went to check in at the United counter in Barcelona, Spain I had 2 different menat 2 different times in United uniforms (standing around with a couple other employees) ask me if I was traveling alone. The one man asked me 3 different ways if I was traveling alone. I am, 68 yeaers old and have all my faculties. I thought it was weird and it made me feel very uncomfortable. What difference does it make if I was traveling alone or with someone? What if I was a recent widow? That would have been horrible. They never gave me a reason why they needed to know who I was traveling with. I was hesitant to question them because I needed to be on that flight.

Crew was great. 2 1/2 hour delay was due to staff needing "rest" was avoidable and self inflicted as United not willing to hire enough crew to keep flight on time.. Ridiculous. The crew and the passengers both suffered due to this.

Fine not above and beyond as I had a connection that was delayed due to maintenance

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

Friendly flight crew. Airplane (757) configured as a domestic flight (no lie-flat seats) & no advanced meal selection.

Was a bit surprised that Icelandair flies a domestically configured 757s on long-haul flights to Iceland (no lie-flat seats in business class).

The Icelandair crew was so kind!!! Thank you for making my first trip to Paris a great one!

I am not going to fillo this out for each leg of my trip. My first review holds for the experience

I had no idea that my ticket only paid for my right to get on the plane. They charged me $130 for my carry-on bag because it was 1 inch too big she claimed but it wasn’t! Then they wanted another fee for everything. I had no idea that Icelandair had changed to such a bargain basement airline. I was very disappointed.

Screen didn't work, and neither did the button to tilt the seat even though the seat was comfortable

Second time with Saga Premium, everything was fab, but the entertainment centre on both my flights didn't work, plus the seat on the NY to Rek flight (Airbus) was so solid and so uncomfortable. The 737Max flight's seat was much, much better.

The most uncomfortable seat i’ve ever had on a flight

Waiting area on top of stairs before Boarding the bus wasn’t great. Took a long time to load the bus to gate.

The real reason why the flying experience with Icelandair ---was mediocre was because of not being able to enter DC airspace yesterday evening. This obviously was out of your control and do realize this is a safety issue. I did notice---that everything was being done to get us to Washington Dulles and we did arrive at Dulles SAFELY with just a 4 hour delay. Thank you!

A shout-out to the flight attendent, Lauren, who was the main person assisting me. She was amazing - perfect balance of bright, cheerful, engaging, yet formal

OK, except for a cabin attendant's lack of attention.

efficient. on time. cabin crew were very professional and very nice to deal with. would definately fly BA again.

It was great overall. A few slight improvements could be made on the onboarding process at the Gates with announcements and clarity of communications (both at the gate and in flight). The movies in the entertainment options could be improved for bollywood, hollywood.

I alrady responded to this request, and expllaned at length that this was the worst flying experience in my 77 years. I will NEVER fly BA again.

Airbus A350 is poorly designed for wheelchair users and reduced mobility passengers. The angle of the pods makes it awkward to transfer. I was able to but I have ab stability. It could be a real challenge for people with more severe mobility impairments. You'd think Airbus would have come up with a solution for this or thought more about us disabled folks more when designing this aircraft.

The crew has always been great on BA. They are very friendly and accommodating. I like that they have vegetarian options already in the menu. And the free wine is a nice perk.) I noticed (both directions of my trip) minor upgrades/ replacements needed on the plane itself (touch screen didn't work with touch; bathroom light didn't go on). However, this is one of my favorite airlines.

Everything was spectacular except the boarding. It was just a mob of people while all groups were called over the public address system.

The Britts are wonderful to fly with and the crew were very hospitable. Again, I really wish they had been able to retrieve my carryon bag from baggage claim before the flight so I could be in a less worrisome state of mind, but that's not on them. I completely understand. The window seats with the dimmable windows were very cool!

There was a delay for the San Francisco-London flight, but we were all informed via text and email. The staff was very friendly and nice and the food was good. I do recommend that the airline offer something without eggs or something vegan for the vegetarian meal option. A lot of Indians are lacto-vegetarian, while some could be allergic to eggs/dairy.

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

Information on your arrival and departure airports