Cheap flights from Washington, D.C. to London from £144
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 21/7. 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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How to get the cheapest flight ticket from Washington, D.C. to London
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?
What is the cheapest month to fly to London?
The cheapest month to fly to London from Washington, D.C. is in January. Flight prices, which tend to average around £473, are often lower during this time because this is during the off-season. The month of October is another great option to travel to London, with average flight prices from Washington, D.C. averaging around £481.
What is the cheapest day to depart on your flight to London?
Our data shows that Tuesday is the least expensive day to fly to London. Tickets to fly out on this day can be as low as £547. When flying out on a Saturday, the most expensive travel day of the week, you can expect to see flight prices from Washington, D.C. to London for around £647.
What is the cheapest time of day to depart on your flight to London?
The cheapest time of day to fly to London is in the evening when flights can be purchased for as low as £578. Flights at midday are often more expensive, with an average ticket price of £1,408.
What is the cheapest Washington, D.C. to London flight route?
Fly from Washington, D.C. Dulles Intl to London Heathrow for the best Washington, D.C. - London flight prices
How far in advance should I book a flight to London?
You are more likely to see cheaper flights to London from Washington, D.C. when booking 15 weeks ahead of your departure date. In general, you can expect to find flights to London for around £566 when searching 15 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London from Washington, D.C. for as low as £520 on momondo.
What cabin class options are available on Washington, D.C. to London flights?
There are 4 cabin classes available to choose from on Washington, D.C. to London 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?
Icelandair, PLAY, and TAP AIR PORTUGAL are the most popular carriers operating from Washington, D.C. to London
Which airlines fly to London?
British Airways, Virgin Atlantic and Iberia are the top three most popular airlines that fly to London from Washington, D.C. according to our data. British Airways is the first choice among our users, with 44% of people opting to fly with this airline when travelling to London. Keep in mind that there are 9 different airlines that fly to London on a routine basis, so you have a few additional options to choose from.
How many flights depart from Washington, D.C. to London on average per day?
30 flights are operational daily from Washington, D.C. to London as of June 2025. The most popular departure time for this route is 22:00, with 71% of flights per day taking off in the evening.
How many flights depart from Washington, D.C. to London on average per week?
216 flights are operational weekly from Washington, D.C. to London as of June 2025. The most popular departure day for this route is Wed, with 15% of flights per week taking off on this day.
When to book flights from Washington, D.C. to London
Cheap Washington, D.C. to London (WAS to LON) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Washington, D.C. to London
How far is Washington, D.C. to London by plane?
There are 3662.3 mi between Washington, D.C. and London. 7h 10m is a normal flight duration for this route.
When did momondo last update prices for flights from Washington, D.C. to London?
Prices for flights from Washington, D.C. to London are refreshed on a daily basis.
How many operators does momondo search for flights from Washington, D.C. to London?
As of June 2025, there are 9 operators available to choose from for flights from Washington, D.C. to London.
How old do you have to be to fly from Washington, D.C. to London?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Washington, D.C. to London.
What documentation or ID do you need to fly to London?
The travel and health documents you'll need for your trip to London may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at London. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Washington, D.C. to London?
Based on momondo bookings for flights between Washington, D.C. and London, the leading plane model is Boeing 777, making up 36.28% of the total bookings. Other popular models include Airbus A380-800 with 19.29%, Boeing 787-8 Dreamliner with 9.62%, and Airbus A380 with 6.70%.
What is the most popular airline from Washington, D.C. to London?
momondo data reveals that the most frequently booked airline on the route from Washington, D.C. to London is British Airways, representing 19% of all bookings. The subsequent popular airlines are Iberia at 15%, Virgin Atlantic at 15%, and PLAY at 12%.
Best airlines flying from Washington, D.C. to London
Compare and see reviews for airlines that fly from Washington, D.C. to London with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom £353 | Free Cancellation | Rating 7.0 499 reviews | |||
| PriceFrom £410 | Free Cancellation | Rating 7.0 2,776 reviews | |||
| PriceFrom £420 | Free Cancellation | Rating 7.5 1,463 reviews | |||
| PriceFrom £420 | Free Cancellation | Rating 6.6 7,011 reviews | |||
| PriceFrom £429 | Free Cancellation | Rating 7.4 652 reviews | |||
| PriceFrom £454 | Free Cancellation | Rating 7.8 1,358 reviews | |||
| PriceFrom £486 | Free Cancellation | Rating 6.7 7,139 reviews | |||
| PriceFrom £488 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom £488 | Free Cancellation | Rating 7.4 8,790 reviews |
KLM Flights From Washington, D.C. to London
KLM flight deals from Washington, D.C. to London start from £616 round-trip. Over the 7 KLM flights for this route in a normal week, average airfare is usually £739 round-trip - but some users have found much cheaper deals with momondo.
Air France Flights From Washington, D.C. to London
Air France (7.5/10 from 1,463 reviews) operates around 7 flights from Washington, D.C. to London in any given week. The average Air France airfare for this route is around £739, with deals from around £570 rare but found on momondo. Referenced prices are for round-trip Washington, D.C. to London flight searches in the last 72 hours.
Travelling to a place near London?
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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?
momondo does allow users to show only those flights to London from Washington, D.C. which offer a flexible booking policy as well as other useful filters and features.
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.