IAD - LHR

C$ 379 Find Cheap Flights from Washington, D.C. to London

1 adult
1 adult, Economy

KAYAK searches hundreds of travel sites at once for deals on flights to London Heathrow Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Washington, D.C. to London, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Washington, D.C. to London, as well as popular online travel agencies
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Expert advice
Booking Insights
Expert advice

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

 
Snippets provided in this section are AI-generated based on a summarisation of KAYAK-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airports
IAD

Arrive early at Dulles due to long security lines. Check an airport map to plan your route from check-in to gate efficiently.

Read more about IADby Stefanie Waldek
LHR

For a quick trip to central London, take the Heathrow Express from Paddington. It's fast but pricey, so consider the Elizabeth Line for savings.

Read more about LHRby Duncan Madden
Our travel experts
Duncan Madden

Duncan Madden

Expert on LHR

Duncan Madden

Duncan Madden

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.

Read more
Stefanie Waldek

Stefanie Waldek

Expert on IAD

Stefanie Waldek

Stefanie Waldek

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.

Read more
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?

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

The average price of all round-trip flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport clicked on KAYAK for each day over the last 12 months.

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

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Washington, D.C. Dulles Intl Airport to London Heathrow 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 Washington, D.C. Dulles Intl Airport to London Heathrow Airport is September, where tickets cost C$ 906 (return) on average. On the other hand, the most expensive months are June and December, where the average cost of round-trip tickets is C$ 1,395 and C$ 1,199 respectively.

Can I save money by flying with a layover from Washington, D.C. Dulles Intl Airport to London Heathrow 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 C$ 1,290, 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 calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Washington, D.C. Dulles Intl Airport to London Heathrow 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 Washington, D.C. Dulles Intl Airport to London Heathrow Airport, you should book around 2 weeks before departure, which saves you about 25% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 15 weeks before departure.

Good to know

Low seasonFebruary
Cheapest flightC$ 379
Best time to beat the crowds (9% less expensive on average)
Most popular time to fly (10% 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
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.

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 3 days, the lowest price for a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport was C$ 274 for a one-way ticket and C$ 518 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 American Airlines 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.

  • Which airline alliances offer flights from Washington, D.C. to London?

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

  • Looking for a cheap flight? 25% of our users found flights on this route for C$ 1,078 or less round-trip.
  • 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?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Washington, D.C. Dulles Intl to London Heathrow.
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

Aer Lingus,Air Canada,Air France, +12 more

Aer Lingus,Air Canada, +13 more

Tuesday

Aer Lingus,Air Canada,Air France, +12 more

Aer Lingus,Air Canada, +13 more

Wednesday

Aer Lingus,Air Canada,Air France, +12 more

Aer Lingus,Air Canada, +13 more

Thursday

Aer Lingus,Air Canada,Air France, +12 more

Aer Lingus,Air Canada, +13 more

Friday

Aer Lingus,Air Canada,Air France, +12 more

Aer Lingus,Air Canada, +13 more

Saturday

Aer Lingus,Air Canada,Air France, +12 more

Aer Lingus,Air Canada, +13 more

Sunday

Aer Lingus,Air Canada,Air France, +12 more

Aer Lingus,Air Canada, +13 more

See more nonstop flights

Direct returns

London Heathrow to Washington, D.C. Dulles Intl

Monday

Aer Lingus,Air Canada,Air France, +12 more

Aer Lingus,Air Canada, +13 more

Tuesday

Aer Lingus,Air Canada,Air France, +12 more

Aer Lingus,Air Canada, +13 more

Wednesday

Aer Lingus,Air Canada,Air France, +12 more

Aer Lingus,Air Canada, +13 more

Thursday

Aer Lingus,Air Canada,Air France, +12 more

Aer Lingus,Air Canada, +13 more

Friday

Aer Lingus,Air Canada,Air France, +12 more

Aer Lingus,Air Canada, +13 more

Saturday

Aer Lingus,Air Canada,Air France, +12 more

Aer Lingus,Air Canada, +13 more

Sunday

Aer Lingus,Air Canada,Air France, +12 more

Aer Lingus,Air Canada, +13 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

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