Cheap flights from Washington, D.C. to London from $301
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 1/11. 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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Not ready to book? to track prices.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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Fly from
Fly to
Route
Depart
Return
Washington, D.C.London
IAD Washington, D.C. Dulles Intl - LHR London Heathrow
IADLHR
Washington, D.C. Dulles Intl
Mon 12/28
8:30 pm-9:40 pm
1 stop20h 10m
London Heathrow
Thu 1/7
10:20 am-5:15 pm
1 stop11h 55m
Washington, D.C.London
IAD Washington, D.C. Dulles Intl - LHR London Heathrow
IADLHR
Washington, D.C. Dulles Intl
Thu 12/3
8:30 pm-6:50 pm
2 stops17h 20m
London Heathrow
Fri 12/11
1:55 pm-6:50 pm
2 stops33h 55m
Washington, D.C.London
IAD Washington, D.C. Dulles Intl - LHR London Heathrow
IADLHR
Washington, D.C. Dulles Intl
Tue 1/12
5:25 pm-12:40 pm
1 stop14h 15m
London Heathrow
Thu 1/21
6:00 am-3:15 pm
1 stop14h 15m
Washington, D.C.London
IAD Washington, D.C. Dulles Intl - LHR London Heathrow
IADLHR
Washington, D.C. Dulles Intl
Tue 11/10
5:25 pm-10:40 pm
1 stop24h 15m
London Heathrow
Sat 11/21
6:00 am-3:15 pm
1 stop14h 15m
Washington, D.C.London
IAD Washington, D.C. Dulles Intl - LHR London Heathrow
IADLHR
Washington, D.C. Dulles Intl
Tue 1/19
5:15 pm-9:05 am
1 stop10h 50m
London Heathrow
Tue 3/23
8:35 pm-7:30 pm
1 stop26h 55m
Washington, D.C.London
IAD Washington, D.C. Dulles Intl - LHR London Heathrow
IADLHR
Washington, D.C. Dulles Intl
Thu 12/10
8:30 pm-6:50 pm
2 stops17h 20m
London Heathrow
Mon 12/14
6:30 am-5:15 pm
2 stops15h 45m
Washington, D.C.London
IAD Washington, D.C. Dulles Intl - LHR London Heathrow
IADLHR
Washington, D.C. Dulles Intl
Mon 11/16
9:45 pm-10:00 am
Nonstop7h 15m
London Heathrow
Thu 11/26
7:30 am-4:20 pm
1 stop13h 50m
Washington, D.C.London
IAD Washington, D.C. Dulles Intl - LHR London Heathrow
IADLHR
Washington, D.C. Dulles Intl
Tue 11/17
6:05 pm-6:15 am
Nonstop7h 10m
London Heathrow
Thu 11/26
7:30 am-4:20 pm
1 stop13h 50m
Washington, D.C.London
IAD Washington, D.C. Dulles Intl - LHR London Heathrow
IADLHR
Washington, D.C. Dulles Intl
Wed 11/25
7:40 pm-7:30 pm
1 stop18h 50m
London Heathrow
Wed 12/2
12:15 pm-6:30 pm
1 stop11h 15m
Washington, D.C.London
IAD Washington, D.C. Dulles Intl - LHR London Heathrow
IADLHR
Washington, D.C. Dulles Intl
Wed 12/9
7:40 pm-7:30 pm
1 stop18h 50m
London Heathrow
Wed 12/16
12:15 pm-6:30 pm
1 stop11h 15m
See travel insights to London from
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?
Prices are currently low for flights on this route.
Typical prices usually range from $733 to $1,077.The lowest price recently found on this route was $680.
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 $692. If you’re not able to fly to London Heathrow Airport in February, then January is your next best option. Flight prices from Washington, D.C. to London Heathrow Airport during January average around $741.
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 $929. The most expensive day to fly to London Heathrow Airport is Friday, with ticket prices averaging around $1,028.
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 afternoon. momondo users have found flights departing from Washington, D.C. to London Heathrow Airport in the afternoon for as low as $968. 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 evening are often more expensive with an average ticket price of $992.
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 from Washington, D.C. 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 $916 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 $889 on momondo.
What cabin class options are available on Washington, D.C. to London Heathrow Airport flights?
There are 4 cabin classes available to choose from on Washington, D.C. to London Heathrow Airport flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
Can stopping save me money on Washington, D.C. to London Heathrow Airport flights?
You could potentially save up to 12% on your flight if you consider stops on a Washington, D.C. to London Heathrow Airport flight.
How have Washington, D.C. to London Heathrow Airport flight prices changed over time?
As of October 2026, prices for Washington, D.C. to London Heathrow Airport flights are approximately 10% cheaper when compared to flights at the same time last year.
What is the cheapest airline that flies from Washington, D.C. to London Heathrow?
Virgin Atlantic, Delta, and British Airways are the most popular carriers operating from Washington, D.C. to London Heathrow
What airlines fly to London Heathrow Airport?
British Airways, United Airlines and American 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 51% of people opting to fly with this airline when traveling to London Heathrow Airport. Keep in mind that there are 18 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.
How often are flights from Washington, D.C. to London delayed?
Historically, on average around 18% of flights between Washington, D.C. and London have experienced a delay on any given week. The average delay length over the past 12 months has been 174 minutes.
What is the most punctual flight time for Washington, D.C. to London flights?
Generally, flights departing in the early afternoon tend to experience fewer delays. Flights in the morning have, in the past, seen delays more frequently in comparison.
What day of the week experiences the fewest flight delays on this route?
Monday is statistically the day of the week which experiences the fewest number of delays on this flight route. Thursday has historically seen more delays on average compared to the rest of the week.
Which airline has the best punctuality record on Washington, D.C. to London flights?
According to our data, Virgin Atlantic have had the least number of delays on this route over the last 12 months; with about 13% of their flights experiencing any sort of delay.
Which airport is the most popular layover for flights between Washington, D.C. and London Heathrow Airport?
Reykjavik (KEF) was the most common stop: 52% of momondo users choosing 1-stop flights on this route connected there.
Which layover airport offers the lowest fares from Washington, D.C. to London Heathrow Airport?
Flights via Lisbon (LIS) offer the lowest average round-trip price of $652.
Which layover airport has the shortest travel time from Washington, D.C. to London Heathrow Airport?
Flights connecting via New York (JFK) have the shortest average one-way travel time: 9h 52m.
Which layover airport has the shortest connection time from Washington, D.C. to London Heathrow Airport?
New York (JFK) has the shortest average layover time for this route: 1h 18m.
How many flights depart from Washington, D.C. to London Heathrow Airport on average per day?
36 flights are operational daily from Washington, D.C. to London Heathrow Airport as of October 2026. The most popular departure time for this route is 10:00PM, with 85% 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 October 2026, there are 253 flights per week flying from Washington, D.C. to London Heathrow Airport. The most common day of the week flights depart is Fri, 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
Frequently asked questions about flying 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. 7h 10m 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 October 2026, there are 18 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 50.86% of all bookings. The subsequent popular models are Boeing 787-10 Dreamliner at 9.07%, Boeing 777-300ER at 8.33%, and Airbus A330-900neo at 6.94%.
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 35% of all bookings. The subsequent popular airlines are United Airlines at 18%, American Airlines at 11%, and Virgin Atlantic at 9%.
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 $422 | Free Cancellation | Rating 7.2 2,377 reviews | |||
| PriceFrom $432 | Free Cancellation | Rating 7.5 694 reviews | |||
| PriceFrom $450 | Free Cancellation | Rating 7.8 8,654 reviews | |||
| PriceFrom $462 | Free Cancellation | Rating 7.4 10,352 reviews | |||
| PriceFrom $481 | Free Cancellation | Rating 6.9 758 reviews | |||
| PriceFrom $500 | Free Cancellation | Rating 7.0 3,247 reviews | |||
| PriceFrom $568 | Free Cancellation | Rating 7.4 2,018 reviews | |||
| PriceFrom $581 | Free Cancellation | Rating 7.5 1,651 reviews | |||
| PriceFrom $589 | Free Cancellation | Rating 6.7 8,260 reviews | |||
| PriceFrom $591 | Free Cancellation | Rating 7.6 1,421 reviews |
KLM Flights From Washington, D.C. to London Heathrow Airport
KLM flight deals from Washington, D.C. to London Heathrow Airport start from $618 round-trip. Over the 8 KLM flights for this route in a normal week, average airfare is usually $1,157 round-trip - but some users have found much cheaper deals with momondo.
Delta Flights From Washington, D.C. to London Heathrow Airport
Across 8,652 Delta reviews on momondo, the average score is 7.8/10. Delta flies from Washington, D.C. to London Heathrow Airport about 8 times each week, with ticket deals ranging from $450 to $1,000. Price data is based on momondo searches in the last 72 hours.
Traveling to a place near London?
Book flights to London if you plan to visit one of these locationsWhy use momondo?
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.