Cheap flights from Washington, D.C. Dulles Intl Airport to London from $196
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 10/18. 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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SWISS flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport
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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?
The month of September is, on average, the cheapest month to fly to London Heathrow Airport from Washington, D.C. Dulles Intl Airport, with most prices found around $675. If you’re not able to fly to London Heathrow Airport in September, then February is your next best option. Flight prices from Washington, D.C. Dulles Intl Airport to London Heathrow Airport during February average around $683.
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 $773. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $901.
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. Dulles Intl Airport to London Heathrow Airport in the morning for as low as $716. 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 $836.
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 $771 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 $695 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
What airlines fly to London Heathrow Airport?
British Airways, United Airlines and Iberia 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 42% of people opting to fly with this airline when traveling to London Heathrow Airport. Keep in mind that there are 16 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?
26 flights are operational daily from Washington, D.C. Dulles Intl Airport to London Heathrow Airport as of June 2025. The most popular departure time for this route is 10:00PM, with 66% of flights per day 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, 185 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 Mon, 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?
A flight from Washington, D.C. Dulles Intl to London Heathrow will travel around 3664.4 mi. By plane, this route typically takes 7h 15m.
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 16 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 you'll need for your trip to London Heathrow Airport 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 Heathrow Airport. 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. Dulles Intl Airport to London Heathrow Airport?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Washington, D.C. Dulles Intl Airport to London Heathrow Airport is Boeing 777 (36.03% of total bookings). The next most popular plane models are Airbus A380-800 (20.30%), Boeing 787-8 Dreamliner (9.84%), and Airbus A380 (7.42%).
What is the most popular airline from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Washington, D.C. Dulles Intl Airport to London Heathrow Airport is British Airways (30% of total bookings). The next most popular airlines are United Airlines (19%), Iberia (16%), and Virgin Atlantic (7%).
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 $379 | Free Cancellation | Rating 7.0 102 reviews | |||
| PriceFrom $394 | Free Cancellation | Rating 7.3 1,387 reviews | |||
| PriceFrom $435 | Free Cancellation | Rating 7.0 499 reviews | |||
| PriceFrom $486 | Free Cancellation | Rating 7.1 1,885 reviews | |||
| PriceFrom $549 | Free Cancellation | Rating 7.1 9,531 reviews | |||
| PriceFrom $552 | Free Cancellation | Rating 6.7 7,136 reviews | |||
| PriceFrom $555 | Free Cancellation | Rating 7.1 1,117 reviews | |||
| PriceFrom $572 | Free Cancellation | Rating 7.5 1,623 reviews | |||
| PriceFrom $572 | Free Cancellation | Rating 8.0 7,950 reviews | |||
| PriceFrom $573 | Free Cancellation | Rating 7.0 2,776 reviews |
Delta Flights From Washington, D.C. Dulles Intl Airport to London Heathrow Airport
The lowest priced Delta flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport from the last 72 hours was $572. Generally, Delta has 7 flights on this route every week with an average price of $828. Delta is rated 8.0/10 by our users.
Finnair Flights From Washington, D.C. Dulles Intl Airport to London Heathrow Airport
$607 is the best Finnair flight deal from Washington, D.C. Dulles Intl Airport to London Heathrow Airport found on momondo over the last 72 hours. The average Finnair ticket price found was closer to $775, however, with flight time and availability significantly affecting the price. Finnair (7.6/10 from 1,290 user reviews) flies into London Heathrow Airport from Washington, D.C. Dulles Intl Airport 13 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?
To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to London from Washington, D.C..
Can I find flights from Washington, D.C. to London with flexible booking policies on momondo?
Yes. All flights to London from Washington, D.C. on momondo can be compared and filtered by various policies on offer, including flexible booking.
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.