IAD - LHR

C$ 451 Find Cheap Flights from Washington, D.C. to London – Compare and Save

1 adult
1 adult, Economy, 0 bags

Save 21% 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 round-trip
C$ 869
Typical prices: C$ 941-C$ 1,328
Scandinavian Airlines
Mon 28/9Thu 1/10
IAD - LHR • 2 stops
Cheapest direct flights
C$ 1,208
Typical prices: C$ 921-C$ 1,291
British Airways
Wed 7/10Wed 14/10
IAD - LHR • Direct
Advice from real travellers
United's late-night IAD-LHR flight is about 6.5 hours; sleep aids help maximize rest.
Pack light for overhead bins; on British Airways, avoiding a checked bag can reduce risk.
Expert advice
Expert advice
+1
+1
Expert advice
Expert advice
+1
Direct flights
You can fly direct with British Airways, United Airlines, and Virgin Atlantic. Average duration is 7h 29m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Avoid delays
Most punctual • 87% on-time
Best time • Fewest delays
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travellers who book at least 3 weeks in advance save around 16% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 22% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches hundreds of sites at once to find you the best travel deals.
We hope you love your trip to Heathrow!
Flight Deals
Booking Insights
Expert advice
Flight Deals

Cheap Flights from Washington, D.C. to Heathrow (IAD-LHR)

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

Recent round-trip flight deals from Washington, D.C. to Heathrow

Mon, 28 Sep - Thu, 1 Oct
Scandinavian Airlines Logo
8:20 p.m. - 5:00 p.m.IAD  Washington, D.C. Dulles Intl-LHR London Heathrow
39h 40m2 stops Kastrup Copenhagen Stockholm Arlanda
Scandinavian Airlines Logo
6:40 a.m. - 5:00 p.m.LHR  London Heathrow-IAD Washington, D.C. Dulles Intl
15h 20m1 stop Kastrup Copenhagen
C$ 869Scandinavian Airlines
Mon, 28 Sep - Thu, 1 Oct
Scandinavian Airlines Logo
8:20 p.m. - 8:55 a.m.IAD  Washington, D.C. Dulles Intl-LHR London Heathrow
31h 35m2 stops Kastrup Copenhagen Stockholm Arlanda
Scandinavian Airlines Logo
7:05 a.m. - 5:00 p.m.LHR  London Heathrow-IAD Washington, D.C. Dulles Intl
38h 55m2 stops Oslo Gardermoen Kastrup Copenhagen
C$ 875Scandinavian Airlines
Sat, 7 Nov - Mon, 9 Nov
Scandinavian Airlines Logo
8:30 p.m. - 9:40 p.m.IAD  Washington, D.C. Dulles Intl-LHR London Heathrow
20h 10m1 stop Kastrup Copenhagen
Scandinavian Airlines Logo
9:05 p.m. - 5:15 p.m.LHR  London Heathrow-IAD Washington, D.C. Dulles Intl
49h 10m2 stops Stockholm Arlanda Kastrup Copenhagen
C$ 892Scandinavian Airlines
Mon, 9 Nov - Thu, 12 Nov
Scandinavian Airlines Logo
8:30 p.m. - 2:35 p.m.IAD  Washington, D.C. Dulles Intl-LHR London Heathrow
37h 05m2 stops Kastrup Copenhagen Oslo Gardermoen
Scandinavian Airlines Logo
1:55 p.m. - 6:50 p.m.LHR  London Heathrow-IAD Washington, D.C. Dulles Intl
57h 55m2 stops Stockholm Arlanda Kastrup Copenhagen
C$ 897Scandinavian Airlines
Fri, 6 Nov - Tue, 10 Nov
TAP AIR PORTUGAL Logo
10:30 p.m. - 5:30 p.m.IAD  Washington, D.C. Dulles Intl-LHR London Heathrow
14h 00m1 stop Lisbon Humberto Delgado
TAP AIR PORTUGAL Logo
6:00 a.m. - 2:45 p.m.LHR  London Heathrow-IAD Washington, D.C. Dulles Intl
13h 45m1 stop Lisbon Humberto Delgado
C$ 901TAP AIR PORTUGAL
Sat, 23 Jan - Tue, 26 Jan
Scandinavian Airlines Logo
8:30 p.m. - 2:35 p.m.IAD  Washington, D.C. Dulles Intl-LHR London Heathrow
37h 05m2 stops Kastrup Copenhagen Oslo Gardermoen
Scandinavian Airlines Logo
9:55 a.m. - 3:15 p.m.LHR  London Heathrow-IAD Washington, D.C. Dulles Intl
34h 20m2 stops Stockholm Arlanda Kastrup Copenhagen
C$ 903Scandinavian Airlines
Sun, 11 Oct - Wed, 21 Oct
TAP AIR PORTUGAL Logo
10:35 p.m. - 10:20 a.m.IAD  Washington, D.C. Dulles Intl-LHR London Heathrow
30h 45m1 stop Lisbon Humberto Delgado
TAP AIR PORTUGAL Logo
6:00 a.m. - 3:10 p.m.LHR  London Heathrow-IAD Washington, D.C. Dulles Intl
14h 10m1 stop Lisbon Humberto Delgado
C$ 910TAP AIR PORTUGAL
Sun, 27 Sep - Tue, 13 Oct
TAP AIR PORTUGAL Logo
10:35 p.m. - 12:45 p.m.IAD  Washington, D.C. Dulles Intl-LHR London Heathrow
33h 10m1 stop Lisbon Humberto Delgado
TAP AIR PORTUGAL Logo
6:45 p.m. - 3:10 p.m.LHR  London Heathrow-IAD Washington, D.C. Dulles Intl
25h 25m1 stop Lisbon Humberto Delgado
C$ 911TAP AIR PORTUGAL
Sun, 20 Sep - Wed, 23 Sep
Scandinavian Airlines Logo
8:20 p.m. - 7:55 p.m.IAD  Washington, D.C. Dulles Intl-LHR London Heathrow
42h 35m2 stops Kastrup Copenhagen Stockholm Arlanda
Scandinavian Airlines Logo
6:40 p.m. - 5:00 p.m.LHR  London Heathrow-IAD Washington, D.C. Dulles Intl
27h 20m1 stop Kastrup Copenhagen
C$ 933Scandinavian Airlines
Fri, 18 Sep - Mon, 21 Sep
Scandinavian Airlines Logo
8:20 p.m. - 6:50 p.m.IAD  Washington, D.C. Dulles Intl-LHR London Heathrow
41h 30m2 stops Kastrup Copenhagen Oslo Gardermoen
Scandinavian Airlines Logo
6:05 p.m. - 5:00 p.m.LHR  London Heathrow-IAD Washington, D.C. Dulles Intl
51h 55m2 stops Stockholm Arlanda Kastrup Copenhagen
C$ 939Scandinavian Airlines
Booking Insights

KAYAK's insights & trends for Washington, D.C. to Heathrow flights

Get data-powered insights and trends into flights from Washington, D.C. to Heathrow to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

Flight prices are below average for this route right now.

Flights to London Heathrow Airport from Washington, D.C. Dulles Intl Airport usually cost between C$ 975 and C$ 1,374 in September.
The lowest price found in the past 5 days was C$ 869 on Scandinavian Airlines (28 Sep–1 Oct).

What’s the cheapest day of the week to fly from Washington, D.C. to London?

If you are looking for a flight deal from Washington, D.C. to London, look for departures on Mondays and avoid leaving on a Thursday, as it's usually the priciest day. When flying back from London, Wednesday is the cheapest day to fly and Sunday is the most expensive.

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

The cheapest month for flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport is February, where tickets cost C$ 960 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is C$ 1,808 and C$ 1,523 respectively.

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

No, with an average price for the route of C$ 1,319, prices are generally cheapest when you fly direct.

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

To get a below average price on the flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport, you should book around 3 weeks before departure, which saves you about 16% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 6 weeks before departure.

Expert advice

Expert advice for your flight from Washington, D.C. to Heathrow

 
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Duncan Madden

Duncan Madden

Expert on 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.

Stefanie Waldek

Stefanie Waldek

Expert on 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.

Good to know

Low season

February

Cheapest flight

C$ 451
Best time to beat the crowds (22% less expensive on average)
Most popular time to fly (24% more expensive on average)
Flight from Washington, D.C. to London

When to book flights from Washington, D.C. to Heathrow

Are your dates flexible? Find out the best times to travel from Washington, D.C. to Heathrow based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price

Flights from Washington, D.C. to Heathrow: the best tips from KAYAK users' own experiences

Insights shared by verified travellers who flew the route from Washington, D.C. to Heathrow 
DeeFlew with United AirlinesFeb 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 AirwaysOct 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 AirlinesJun 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, D.C. to London flights

  • What accessibility services are there at Dulles Intl Airport?

    To cater to travelers with limited mobility and disabilities, Dulles Airport offers a wide range of accessibility services. These include elevators with Braille signage and self-voicing announcements, wheelchair access, a pet relief area for service or companion dogs, public restrooms with disability access, and assisted security screenings.

  • Are there nonstop flights from Dulles Intl to London-Heathrow Airport?

    Passengers wishing to fly from Washington, DC, to London can get nonstop flights from several airlines, including Lufthansa. Other nonstop flights are operated by multiple airlines, although the tickets come at a higher price. Most flights operated by American Airlines, Finnair, Icelandair, Delta Air Lines, and Virgin Atlantic have one- or two-stop flights. Depending on the airline, you may board your connecting flight in Keflavik, Dallas, Chicago, Helsinki, Boston, or Atlanta.

  • Are there airport hotels at London-Heathrow Airport?

    There are hotels located right within Heathrow Airport. They include the Hilton Garden Inn Airport Hotel, situated right next to Terminal 2 and a few minutes walk to Terminal 3. Alternatively, you can choose to stay at the Aerotel London Heathrow situated near Terminal 2 and 3. Other hotels within a comfortable walking distance include the Novotel London Heathrow Airport T1 T2 and T3, Ibis Styles London Heathrow Airport, Radisson Blu Edwardian Heathrow Hotel, and more.

  • How can I get from Heathrow Airport to the London city center?

    You can get from London-Heathrow Airport to the city center by train. You can board a train from Heathrow Central Station, located about 5min from terminals 2 and 3. You can get train tickets at the automated ticketing machines or booking office at the station. Trains from the airport arrive in the downtown area at Paddington Station after about 15min.

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

    In the last 5 days, the lowest price for a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport was C$ 451 for a one-way ticket and C$ 869 for a round-trip.

  • Which airports will I be using when flying from Washington, D.C. to London?

    On your way to London, you’ll fly out from Washington, D.C. Dulles Intl. You’ll be landing at London Heathrow.

  • Which airlines offer Wi-Fi service onboard planes from Washington, D.C. to London?

    Only KLM offers inflight Wi-Fi service on the Washington, D.C. to London flight route.

  • Which aircraft models fly most regularly from Washington, D.C. to London?

    The Boeing 777 is the aircraft model that flies most regularly on the Washington, D.C. to London flight route.

  • On which days can I fly direct from Washington, D.C. to London?

    There are direct flights from Washington, D.C. to London on a daily basis.

  • How does KAYAK find such low prices on flights from Washington, D.C. 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, D.C. to London.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London from Washington, D.C. 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, D.C. to London?

    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 London with an airline and back to Washington, D.C. with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Washington, D.C. 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, D.C. 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 Heathrow Airport

  • You can get to Dulles International Airport (IAD) from downtown Washington, DC, by car, bus, or train. If you require quick access to the airport, we recommend taking the train. A train ticket goes for about $11 and is a great way to avoid traffic.
  • Do you have a flight departure and want to return your rental car to one of the rental car companies at Dulles Intl Airport (IAD)? Follow the "Rental Car Return" signs at the airport, which lead to Autopilot Dr. Here, you'll find the rental car parking lots. Your rental company's shuttle bus should take you to the terminal.
  • If you feel like relaxing after touching down in London, you can access VIP services from one of the Heathrow (LHR) lounges. They include the Plaza Premium Lounge in Terminal 4, which charges around £27.45 ($38), the Club Aspire Lounge in Terminal 3, which charges approximately £27.45 ($38), and the Sky Team Lounge in Terminal 4, which charges around £31.39 ($43.50).
  • Pet lovers can travel with their pets from Washington, DC. The airport has pet relief areas outside the terminal building, right after security, and another one inside the concourses. If you plan to travel with your pet in the cabin or send him as baggage, we recommend that you contact your airline in advance.
  • Washington, DC/London air route is popular among business travelers. London Heathrow Airport is located about 14 miles from London city, offering easy access to business-centric points of interest like the Royal Horticultural Halls and the Excel Business Expo Center.

Prefer to fly direct from Washington, D.C. to London?

 
Find which airlines fly direct from Washington, D.C. Dulles Intl Airport to London Heathrow Airport, which days they fly and book direct flights.

Direct departures

Washington, D.C. Dulles Intl to London Heathrow

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 nonstop flights

Direct returns

London Heathrow 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 nonstop flights

Everything you need to know for your flight from Washington, D.C. to Heathrow

Information on your arrival and departure airports