LON - IAD

£371 Find Cheap Flights from London to Washington Dulles Airport – Compare and Save

1 adult
1 adult, Economy, 0 bags

Save 34% or more on flights. Compare deals from all over the web.

Never overpay with our price tracking tools.

Filter searches by price, airline and more to find your best flights.

Everything you should know

Cheapest return flight
£403
Typical prices: £469-£638
TAP AIR PORTUGAL
Thu 6/12Thu 13/12
LGW - IAD • 1 stop
Cheapest direct flights
£412
Typical prices: £482-£648
British Airways
Sun 21/1Fri 9/2
LHR - IAD • Direct
Direct flights
You can fly direct with British Airways, United Airlines, and Virgin Atlantic. Average duration is 8h 36m
Direct flights
+1
Direct flights
+1
Top routes
Cheapest • 24% average savings
Most popular
Insights
Insights
Avoid delays
Most punctual • 90% on-time
Best time • Fewest delays
Insights
Insights
When to book
in advance
Our data shows that travellers who book at least 22 weeks in advance save around 26% compared to booking last minute.
Insights
Insights
When to travel
Cheapest • 15% price drop
Most popular
Good to know
+1
Good to know
+1
Top stopover airports
Cheapest • Avg £367 (return)
Shortest trip • 10h 41m (one-way)
Insights
Insights
Start a new search
KAYAK searches hundreds of sites at once to find you the best travel deals.
We hope you enjoy your trip to Washington, D.C. Dulles Intl Airport!
Flight Deals
Booking Insights
Expert advice
Flight Deals

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

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent return flight deals from London to Dulles Intl

Mon, 16 Nov - Tue, 1 Dec
TAP AIR PORTUGAL Logo
18:30 - 14:40LHR  London Heathrow-IAD Washington, D.C. Dulles Intl
25h 10m1 stop Lisbon Humberto Delgado
TAP AIR PORTUGAL Logo
17:25 - 21:35IAD  Washington, D.C. Dulles Intl-LHR London Heathrow
23h 10m1 stop Lisbon Humberto Delgado
£403TAP AIR PORTUGAL
Sun, 6 Dec - Sun, 13 Dec
TAP AIR PORTUGAL Logo
10:40 - 15:15LGW  London Gatwick-IAD Washington, D.C. Dulles Intl
33h 35m1 stop Lisbon Humberto Delgado
TAP AIR PORTUGAL Logo
22:30 - 15:45IAD  Washington, D.C. Dulles Intl-LGW London Gatwick
12h 15m1 stop Lisbon Humberto Delgado
£403TAP AIR PORTUGAL
Tue, 2 Mar - Tue, 9 Mar
Icelandair Logo
20:35 - 18:30LHR  London Heathrow-IAD Washington, D.C. Dulles Intl
26h 55m1 stop Reykjavik Keflavik Intl
Icelandair Logo
19:40 - 19:30IAD  Washington, D.C. Dulles Intl-LHR London Heathrow
18h 50m1 stop Reykjavik Keflavik Intl
£403Icelandair
Wed, 13 Jan - Wed, 3 Feb
Icelandair Logo
20:35 - 18:30LHR  London Heathrow-IAD Washington, D.C. Dulles Intl
26h 55m1 stop Reykjavik Keflavik Intl
Icelandair Logo
19:40 - 10:50IAD  Washington, D.C. Dulles Intl-LHR London Heathrow
10h 10m1 stop Reykjavik Keflavik Intl
£403Icelandair
Thu, 21 Jan - Tue, 9 Feb
British Airways Logo
16:25 - 19:55LHR  London Heathrow-IAD Washington, D.C. Dulles Intl
8h 30mdirect
British Airways Logo
18:05 - 06:15IAD  Washington, D.C. Dulles Intl-LHR London Heathrow
7h 10mdirect
£412British Airways
Wed, 2 Dec - Wed, 9 Dec
Multiple Airlines Logo
12:30 - 15:15STN  London Stansted-IAD Washington, D.C. Dulles Intl
31h 45m2 stops Madrid Barajas Lisbon Humberto Delgado
Multiple Airlines Logo
22:30 - 23:45IAD  Washington, D.C. Dulles Intl-STN London Stansted
20h 15m2 stops Lisbon Humberto Delgado Madrid Barajas
£430Multiple Airlines
Tue, 24 Nov - Tue, 1 Dec
Virgin Atlantic Logo
08:40 - 15:45LHR  London Heathrow-IAD Washington, D.C. Dulles Intl
12h 05m1 stop Amsterdam Schiphol
Virgin Atlantic Logo
18:55 - 07:20IAD  Washington, D.C. Dulles Intl-LHR London Heathrow
7h 25mdirect
£432Virgin Atlantic
Mon, 15 Mar - Tue, 30 Mar
Virgin Atlantic Logo
06:30 - 16:55LHR  London Heathrow-IAD Washington, D.C. Dulles Intl
14h 25m1 stop Amsterdam Schiphol
Virgin Atlantic Logo
22:35 - 11:00IAD  Washington, D.C. Dulles Intl-LHR London Heathrow
7h 25mdirect
£435Virgin Atlantic
Mon, 1 Mar - Thu, 29 Apr
British Airways Logo
08:50 - 15:45LHR  London Heathrow-IAD Washington, D.C. Dulles Intl
11h 55m1 stop Dublin
British Airways Logo
17:40 - 06:20IAD  Washington, D.C. Dulles Intl-LHR London Heathrow
7h 40mdirect
£439British Airways
Mon, 23 Nov - Fri, 27 Nov
Multiple Airlines Logo
10:00 - 15:55LHR  London Heathrow-IAD Washington, D.C. Dulles Intl
10h 55m1 stop Amsterdam Schiphol
Multiple Airlines Logo
19:30 - 07:55IAD  Washington, D.C. Dulles Intl-LHR London Heathrow
7h 25mdirect
£444Multiple Airlines
Booking Insights

Price, demand, and travel trends for London to Washington, D.C. Dulles Intl Airport flights

Use KAYAK data on prices, travel dates, airlines, and seasonal trends to compare options and book flights with more confidence.

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

Return flights from London to Washington, D.C. Dulles Intl Airport typically range from £469 to £638. The lowest price found in the past 5 days was £403 on TAP AIR PORTUGAL.

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

London Gatwick Airport (LGW) to Washington, D.C. Dulles Intl Airport (IAD) is the cheapest London to Washington, D.C. Dulles Intl Airport route, averaging £428 return. Other London to Washington, D.C. Dulles Intl Airport routes average £601, based on KAYAK data over the past 12 months.

What's the cheapest day of the week to fly from London to Washington, D.C. Dulles Intl Airport?

Based on deals KAYAK users found in the last 12 months, Thursday is the cheapest day of the week to fly from London to Washington, D.C. Dulles Intl Airport. It’s 3% cheaper than the average day, while Sunday is the most expensive, with prices 5% higher.

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

•February is the cheapest month to fly from London to Washington, D.C. Dulles Intl Airport at £468 return.
•May (£575) and June (£574) are the most expensive months.
•The price difference between flying in the cheapest and most expensive months is 22% on average.
This is based on KAYAK aggregated and averaged internal data over the past 12 months.

When are flights from London to Washington, D.C. Dulles Intl Airport the cheapest?

Flights from London to Washington, D.C. Dulles Intl Airport are cheapest 22 weeks before departure. Booking in this window typically costs about 26% less than the average last-minute fare (within 2 weeks of the flight), based on KAYAK data.

Expert advice

Expert advice for your flight from London to Dulles Intl

 
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.

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.

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.

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.

Key details for London to Washington, D.C. Dulles Intl Airport flights

Low season

February

Cheapest flight

£371
Beat the crowds with an average 45% drop in traveller numbers.
The most popular month to fly with an average 70% increase in traveller numbers.
One-way flight from London Heathrow Airport to Washington, D.C. Dulles Intl 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

Your London to Washington, D.C. Dulles Intl Airport flight questions, answered

Find helpful answers about this route, including flight times, airports, airlines, and booking tips.

  • What are the earliest and latest flights from London to Washington, D.C. Dulles Intl Airport?

    These are the earliest and latest flight times available from London to Washington, D.C. Dulles Intl Airport:

    • Earliest: departs at 12:05 and lands at 20:41
    • Latest: departs at 17:05 and lands at 01:41.

    The flight takes about 8h 36m.

  • Which cabin classes can I book on flights from London to Washington, D.C. Dulles Intl Airport?

    Four cabin classes are available on flights from London to Washington, D.C. Dulles Intl Airport:

    • Economy class
    • Premium Economy Class
    • Business Class
    • First Class

    Prices vary by airline.

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

    A direct flight from London to Washington, D.C. Dulles Intl Airport takes 8h 36m, covering 3,677 miles.

  • Do I need a passport to fly from London to Washington, D.C. Dulles Intl Airport?

    Yes, a valid passport is required for this international route. Many destinations require at least six months of validity beyond your travel dates. Check your passport expiry well before booking.

  • How much should I expect to pay for a London to Washington, D.C. Dulles Intl Airport flight?

    Return flights from London to Washington, D.C. Dulles Intl Airport range from £469 to £638, with an average of £549 over the past 12 months. Anything below £469 counts as a good deal.

  • How expensive are last-minute London to Washington, D.C. Dulles Intl Airport flights?

    Last-minute fares on this route (booked within two weeks of departure) run 16% above the £549 route average. Book 22 weeks before departure for the lowest fares.

  • How much can I save by having a stopover when flying from London to Washington, D.C. Dulles Intl Airport?

    On this route, stopover flights are cheaper than direct options on average. Stopover fares average £367 return via Chicago O'Hare Intl (ORD), compared with £558 for direct.

  • How does on-time performance compare across airlines flying from London to Washington, D.C. Dulles Intl Airport?

    United Airlines is slightly above the route average for timely arrivals, while Virgin Atlantic has a lower on-time arrival rate. On-time arrival rates on London to Washington, D.C. Dulles Intl Airport flights are:

    • United Airlines: 90% on time
    • Virgin Atlantic: 82% on time
    • British Airways: 79% on time

    On average, flights on this route are punctual 84% of the time.

  • What is the standard checked bag allowance on flights from London to Washington, D.C. Dulles Intl Airport?

    There is no standard. Checked bag policies vary by airline on this route. Most carriers charge £34–£75 for the first checked bag in Economy. Premium fares and elite status bookings typically include a free checked bag.

  • How are flight departures from London to Washington, D.C. Dulles Intl Airport spread across the day?

    Afternoon is the busiest departure period on London to Washington, D.C. Dulles Intl Airport flights, with 100% leaving in that window. Morning departures account for 0%, Evening flights for 0%, and Night flights for 0%.

  • Which airlines offer Wi-Fi on London to Washington, D.C. Dulles Intl Airport flights?

    Two airlines offer in-flight Wi-Fi on London to Washington, D.C. Dulles Intl Airport flights:

    • Virgin Atlantic
    • Delta

    Pricing varies by airline and fare class. Some plans are included with the ticket or loyalty programme, while others are paid add-ons priced by flight length.

  • How are flight prices from London to Washington, D.C. Dulles Intl Airport looking right now?

    One-way fares from London to Washington, D.C. Dulles Intl Airport are currently lower than usual. Average one-way flight prices are about £380, which is 32% below the typical average for this route.

  • Which car hire options are available at Washington, D.C. Dulles Intl Airport (IAD)?

    Washington, D.C. Dulles Intl Airport (IAD) hosts 5 major car hire companies, with daily rates starting from around £18 for economy cars. Top options include:

    • Dollar
    • Hertz
    • Budget
    • Sixt
    • Thrifty

  • Which airports can I use when flying from London to Washington, D.C. Dulles Intl Airport?

    Flights from London to Washington, D.C. Dulles Intl Airport may depart from several airports in London area, including London City (LCY), London Gatwick (LGW), London Heathrow (LHR), London Luton (LTN), London Southend (SEN) and London Stansted (STN). Flights usually arrive at Washington, D.C. Dulles Intl (IAD).

  • What time of day has the fewest delays on flights from London to Washington, D.C. Dulles Intl Airport?

    Afternoon flights have the fewest delays on this route.

  • At what point is a flight considered delayed on the route from London to Washington, D.C. Dulles Intl Airport?

    A flight is considered delayed when it departs 15 minutes or more after its scheduled time. This is the standard used by the US Department of Transportation and most airline industry reporting. On the London to Washington, D.C. Dulles Intl Airport route, 16% of flights were delayed in the past three months, with delays averaging 2h 15m.

  • Which airports do connecting flights from London to Washington, D.C. Dulles Intl Airport pass through?

    One-stop flights from London to Washington, D.C. Dulles Intl Airport most commonly connect through:

    • Reykjavik Keflavik Intl (KEF) – 39% of one-stop connections
    • Dublin (DUB) – 36% of one-stop connections
    • Lisbon Humberto Delgado (LIS) – 6% of one-stop connections
    • Zurich (ZRH) – 4% of one-stop connections

  • Can I save money by using flexible dates for flights from London to Washington, D.C. Dulles Intl Airport?

    Yes. Flexible dates can save you up to 8% on flights from London to Washington, D.C. Dulles Intl Airport. Thursday is the cheapest departure day at £536 return on average, while Sunday is the most expensive at £582, a difference of £46.

    KAYAK's flexible dates feature shows options up to three days before and after your selected dates, making it easier to compare nearby fares.

  • Which airlines fly from London to Washington, D.C. Dulles Intl Airport?

    3 airlines operate flights between London and Washington, D.C. Dulles Intl Airport. The airlines offering direct flights on this route include:

    • British Airways
    • United Airlines
    • Virgin Atlantic

  • How much time can I save by choosing a different stopover airport from London to Washington, D.C. Dulles Intl Airport?

    Flying via Newark (EWR) gives the shortest average 1-stop total travel time of 10h 41m, compared to 10h 58m via Dublin (DUB) and 11h 03m via New York John F Kennedy Intl (JFK).

  • What is the time difference between London and Washington, D.C. Dulles Intl Airport?

    Washington, D.C. Dulles Intl Airport is 4 hours behind London (Eastern Time vs British Time). Plan for the time shift when scheduling connections or first-day activities.

  • What popular places can I visit in Washington, D.C. Dulles Intl Airport?

    Some of the most popular sights in Washington, D.C. Dulles Intl Airport are Charles Sumner School Museum and Archives, Capital One Arena, and Grand Hyatt Washington. These are among the most viewed places in Washington, D.C. Dulles Intl Airport on KAYAK.

  • Which airlines offer extra legroom and free seat selection on London to Washington, D.C. Dulles Intl Airport flights?

    Among airlines operating London to Washington, D.C. Dulles Intl Airport flights:

    • Virgin Atlantic: offers extra legroom; offers free seat selection
    • United Airlines: offers extra legroom; offers free seat selection
    • Delta: offers extra legroom; offers free seat selection
    • Iberia: offers free seat selection
    • KLM: offers extra legroom; offers free seat selection

    Extra legroom and free seat selection availability depends on fare class and route.

  • Which airlines include bags at no extra cost on London to Washington, D.C. Dulles Intl Airport flights?

    Here are some options for this route, based on selected ticket types and cabin classes:

    • British Airways: a cabin bag and a checked bag in Economy class
    • Lufthansa: a cabin bag and a checked bag in Economy class
    • Virgin Atlantic: a cabin bag and a checked bag in Economy class

    Baggage allowance can vary by ticket type, cabin class, route, and airline, so always check the fare details before booking.

Your guide to booking London to Washington, D.C. Dulles Intl Airport flights

Get tips on when to book, when to fly, and what to know before your trip.
  • If your dates are flexible, aim for a Thursday departure and avoid flying on Sunday. On this route, Thursday flights average £536, about £46 less than Sunday fares (8% savings) based on the last 12 months.
  • For the best chance at a low fare, aim to book around 22 weeks before you fly. On this route, that window historically saves about 26% versus last-minute pricing (KAYAK booking data, last 12 months).
  • If you can choose when to travel, plan your London to Washington, D.C. Dulles Intl Airport trip for February. Fares historically average £468 return in that month – typically £106 less than the most expensive month, which is May (based on the last 12 months).
  • For the best chance of arriving on time, fly with United Airlines. Over the past three months, 90% of United Airlines flights from London to Washington, D.C. Dulles Intl Airport arrived on time, slightly above the route average of 84%. When flights on this route arrive late, they're delayed by an average of 2h 15m, so choosing an airline with strong on-time performance can make a difference if you're on a tight schedule.
  • If you have the time, taking a 1-stop flight through Chicago O'Hare Intl Airport (ORD) can be cheaper than flying direct. The cheapest stopover option averages £367 return on this route – about £190 less than direct flights (based on the last 12 months).

Prefer to fly direct from London to Washington Dulles Airport?

 
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

More options for your flight from London to Dulles Intl

Complete your trip to Washington, D.C. with a hotel stay or car hire