Cheap flights from Washington, D.C. to London from $212
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. to London departing on 10/12. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Scandinavian Airlines flights from Washington, D.C. to London Heathrow Airport
Our best Scandinavian Airlines deals on Washington, D.C. to London Heathrow Airport flight tickets
TAP AIR PORTUGAL flights from Washington, D.C. to London Heathrow Airport
Our best TAP AIR PORTUGAL deals on Washington, D.C. to London Heathrow Airport flight tickets
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How to get the cheapest flight ticket from Washington, D.C. to London Heathrow Airport
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the typical price of a round-trip flight between Washington, D.C. and London Heathrow Airport?
What is the cheapest month to fly to London Heathrow Airport?
The month of February is, on average, the cheapest month to fly to London Heathrow Airport from Washington, D.C., with most prices found around $681. If you’re not able to fly to London Heathrow Airport in February, then October is your next best option. Flight prices from Washington, D.C. to London Heathrow Airport during October average around $681.
What is the cheapest day to depart on your flight to London Heathrow Airport?
Our data shows that Wednesday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $767. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $898.
What is the cheapest time of day to depart on your flight to London Heathrow Airport?
According to our data, the cheapest time of day to fly to London Heathrow Airport is in the morning. momondo users have found flights departing from Washington, D.C. to London Heathrow Airport in the morning for as low as $748. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the afternoon are often more expensive with an average ticket price of $834.
What is the cheapest Washington, D.C. to London Heathrow flight route?
Fly from Washington, D.C. Dulles Intl to London Heathrow for the best Washington, D.C. - London Heathrow flight prices
How far in advance should I book a flight to London Heathrow Airport?
You are more likely to see cheaper flights to London Heathrow Airport from Washington, D.C. when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around $768 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London Heathrow Airport from Washington, D.C. for as low as $692 on momondo.
What cabin class options are available on Washington, D.C. to London Heathrow flights?
There are 4 cabin classes available to choose from on Washington, D.C. to London Heathrow flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
What is the cheapest airline that flies from Washington, D.C. to London Heathrow?
Icelandair and TAP AIR PORTUGAL are the most popular carriers operating from Washington, D.C. to London Heathrow
What airlines fly to London Heathrow Airport?
British Airways, Iberia and United Airlines are the top three most popular airlines that fly to London Heathrow Airport from Washington, D.C. according to our data. British Airways is the first choice among our users, with 48% of people opting to fly with this airline when traveling to London Heathrow Airport. Keep in mind that there are 17 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.
How many flights depart from Washington, D.C. to London Heathrow Airport on average per day?
28 flights are operational daily from Washington, D.C. to London Heathrow Airport as of July 2025. The most popular departure time for this route is 10:00PM, with 78% of flights per day taking off in the evening.
How many flights depart from Washington, D.C. to London Heathrow Airport on average per week?
As of July 2025, there are 201 flights per week flying from Washington, D.C. to London Heathrow Airport. The most common day of the week flights depart is Wed, with 16% of flights taking off on this day.
When to book flights from Washington, D.C. to London Heathrow Airport
Cheap Washington, D.C. to London Heathrow Airport (WAS to LHR) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Washington, D.C. to London Heathrow Airport
How far is Washington, D.C. to London Heathrow by plane?
Washington, D.C. and London Heathrow are 3649.4 mi apart from one another. 9h 04m is a normal flight duration for this route.
When did momondo last update prices for flights from Washington, D.C. to London Heathrow Airport?
Prices for flights from Washington, D.C. to London Heathrow Airport were last updated today.
How many operators does momondo search for flights from Washington, D.C. to London Heathrow Airport?
As of July 2025, there are 17 operators available to choose from for flights from Washington, D.C. to London Heathrow Airport.
How old do you have to be to fly from Washington, D.C. to London Heathrow Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Washington, D.C. to London Heathrow Airport.
What documentation or ID do you need to fly to London Heathrow Airport?
The required travel and health documents for your London Heathrow Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at London Heathrow Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular plane model from Washington, D.C. to London Heathrow Airport?
momondo data reveals that the most frequently booked plane model on the route from Washington, D.C. to London Heathrow Airport is Boeing 777, representing 36.81% of all bookings. The subsequent popular models are Airbus A380-800 at 19.50%, Boeing 787-8 Dreamliner at 10.19%, and Airbus A380 at 6.78%.
What is the most popular airline from Washington, D.C. to London Heathrow Airport?
momondo data reveals that the most frequently booked airline on the route from Washington, D.C. to London Heathrow Airport is British Airways, representing 32% of all bookings. The subsequent popular airlines are Iberia at 17%, United Airlines at 15%, and Icelandair at 7%.
Best airlines flying from Washington, D.C. to London Heathrow Airport
Compare and see reviews for airlines that fly from Washington, D.C. to London Heathrow Airport with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $379 | Free Cancellation | Rating 7.0 102 reviews | |||
| PriceFrom $409 | Free Cancellation | Rating 7.3 1,416 reviews | |||
| PriceFrom $421 | Free Cancellation | Rating 8.0 7,983 reviews | |||
| PriceFrom $434 | Free Cancellation | Rating 7.0 514 reviews | |||
| PriceFrom $486 | Free Cancellation | Rating 7.1 1,912 reviews | |||
| PriceFrom $549 | Free Cancellation | Rating 7.1 9,678 reviews | |||
| PriceFrom $557 | Free Cancellation | Rating 7.1 1,144 reviews | |||
| PriceFrom $572 | Free Cancellation | Rating 7.5 1,654 reviews | |||
| PriceFrom $574 | Free Cancellation | Rating 7.0 2,819 reviews | |||
| PriceFrom $581 | Free Cancellation | Rating 7.2 10,000 reviews |
Delta Flights From Washington, D.C. to London Heathrow Airport
Delta flight deals from Washington, D.C. to London Heathrow Airport start from $421 round-trip. Over the 7 Delta flights for this route in a normal week, average airfare is usually $820 round-trip - but some users have found much cheaper deals with momondo.
Finnair Flights From Washington, D.C. to London Heathrow Airport
Across 1,306 Finnair reviews on momondo, the average score is 7.6/10. Finnair flies from Washington, D.C. to London Heathrow Airport about 10 times each week, with ticket deals ranging from $585 to $754. Price data is based on momondo searches in the last 72 hours.
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Why should I use momondo to find a flight deal from Washington, D.C. to London?
Finding the right flight to London from Washington, D.C. is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to London quick and easy, saving you time and money.
Can I find flights from Washington, D.C. to London with flexible booking policies on momondo?
Yes. momondo allows you to filter the results for Washington, D.C. to London flights to just show those with flexible booking policies.
How can momondo help me find flights from Washington, D.C. to London?
momondo provides multiple filters to help you find the best flight to London from Washington, D.C.. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.
I’m not ready to book a flight from Washington, D.C. to London right now. Can momondo alert me if prices change?
If you are not ready to book a flight from Washington, D.C. to London now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to London and let you know when they change.