Cheap flights from Washington, D.C. Dulles Intl Airport 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. Dulles Intl Airport to London departing on 18/10. 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. Dulles Intl Airport 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 cheapest month to fly to London Heathrow Airport?
In general, September is the cheapest month to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £497. The month of February is another great option to travel to London Heathrow Airport, with average flight prices from Washington, D.C. Dulles Intl Airport averaging around £503.
What is the cheapest day to depart on your flight to London Heathrow Airport?
On average, the least expensive day to fly to London Heathrow Airport from Washington, D.C. Dulles Intl Airport is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as £547. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Saturday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Saturday is £647.
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 evening. momondo users have found flights departing from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in the evening for as low as £578. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are £610 on average. Flights to London Heathrow Airport from Washington, D.C. Dulles Intl Airport in the afternoon are generally more expensive because this time of day is more convenient for travellers’ schedules.
What is the cheapest Washington, D.C. Dulles Intl to London Heathrow flight route?
Fly from Washington, D.C. Dulles Intl to London Heathrow for the best Washington, D.C. Dulles Intl - 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. Dulles Intl Airport when booking 15 weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £568 when searching 15 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. Dulles Intl Airport for as low as £511 on momondo.
What cabin class options are available on Washington, D.C. Dulles Intl to London Heathrow flights?
There are 4 cabin classes available to choose from on Washington, D.C. Dulles Intl 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. Dulles Intl to London Heathrow?
Icelandair, TAP AIR PORTUGAL, and Brussels Airlines are the most popular carriers operating from Washington, D.C. Dulles Intl to London Heathrow
Which airlines fly to London Heathrow Airport?
British Airways, Virgin Atlantic and United Airlines are the top three most popular airlines that fly to London Heathrow Airport from Washington, D.C. Dulles Intl Airport according to our data. British Airways is the first choice among our users, with 35% of people opting to fly with this airline when travelling to London Heathrow Airport. Keep in mind that there are 8 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. Dulles Intl Airport to London Heathrow Airport on average per day?
As of June 2025, there are 25 flights per day flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport. The most common time of day flights depart is 22:00, with 66% of flights taking off in the evening.
How many flights depart from Washington, D.C. Dulles Intl Airport to London Heathrow Airport on average per week?
As of June 2025, 181 flights take off from Washington, D.C. Dulles Intl Airport and land in London Heathrow Airport each week. The most common flight departure day for this route is Wed, with 15% of weekly flights taking off on this day.
When to book flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport
Cheap Washington, D.C. Dulles Intl Airport to London Heathrow Airport (IAD to LHR) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport
How far is Washington, D.C. Dulles Intl to London Heathrow by plane?
London Heathrow is 3664.4 mi away from Washington, D.C. Dulles Intl. In terms of flight time, this usually takes a little over 7h 10m.
When did momondo last update prices for flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
Prices for flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
As of June 2025, there are 8 operators available to choose from for flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport.
How old do you have to be to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
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. Dulles Intl Airport to London Heathrow Airport.
What documentation or ID do you need to fly to London Heathrow Airport?
The travel and health documents required for your trip to London Heathrow Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at London Heathrow Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular plane model from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
Based on momondo bookings for flights between Washington, D.C. Dulles Intl Airport and London Heathrow Airport, the leading plane model is Boeing 777, making up 36.03% of the total bookings. Other popular models include Airbus A380-800 with 20.30%, Boeing 787-8 Dreamliner with 9.84%, and Airbus A380 with 7.42%.
What is the most popular airline from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
momondo data reveals that the most frequently booked airline on the route from Washington, D.C. Dulles Intl Airport to London Heathrow Airport is British Airways, representing 27% of all bookings. The subsequent popular airlines are Virgin Atlantic at 24%, United Airlines at 13%, and Iberia at 13%.
Best airlines flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport
Compare and see reviews for airlines that fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom £365 | Free Cancellation | Rating 7.0 499 reviews | |||
| PriceFrom £420 | Free Cancellation | Rating 7.5 1,463 reviews | |||
| PriceFrom £429 | Free Cancellation | Rating 7.4 652 reviews | |||
| PriceFrom £442 | Free Cancellation | Rating 6.6 7,011 reviews | |||
| PriceFrom £452 | Free Cancellation | Rating 7.0 2,776 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 7.4 8,790 reviews |
KLM Flights From Washington, D.C. Dulles Intl Airport to London Heathrow Airport
KLM operates around 7 flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport every week. The average price of these flights found in the last 72 hours has been £739, but momondo users have found KLM deals from Washington, D.C. Dulles Intl Airport to London Heathrow Airport from as low as £616 round-trip. KLM has been scored 7.8/10 in 1,358 reviews.
Air France Flights From Washington, D.C. Dulles Intl Airport to London Heathrow Airport
£570 is the best Air France flight deal from Washington, D.C. Dulles Intl Airport to London Heathrow Airport found on momondo over the last 72 hours. The average Air France ticket price found was closer to £739, however, with flight time and availability significantly affecting the price. Air France (7.5/10 from 1,463 user reviews) flies into London Heathrow Airport from Washington, D.C. Dulles Intl Airport 7 times in an average week so prices can vary.
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Why should I use momondo to find a flight deal from Washington, D.C. to London?
We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Washington, D.C. to London for you.
Can I find flights from Washington, D.C. to London with flexible booking policies on momondo?
Flights from Washington, D.C. to London with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.
How can momondo help me find flights from Washington, D.C. to London?
Once you have performed a search for Washington, D.C. to London flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.
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.