Cheap flights from Washington, D.C. Dulles Intl Airport to London from $328
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 1/28. 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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Our best Scandinavian Airlines deals on Washington, D.C. Dulles Intl Airport to London Heathrow Airport flight tickets
TAP AIR PORTUGAL flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport
Our best TAP AIR PORTUGAL deals on Washington, D.C. Dulles Intl Airport to London Heathrow Airport flight tickets
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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 11/10
5:25 pm-5:30 pm
1 stop19h 05m
London Heathrow
Tue 11/17
6:00 am-2:40 pm
1 stop13h 40m
Washington, D.C.London
IAD Washington, D.C. Dulles Intl - LHR London Heathrow
IADLHR
Washington, D.C. Dulles Intl
Sat 11/7
5:25 pm-10:40 pm
1 stop24h 15m
London Heathrow
Thu 11/26
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
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
Tue 3/9
8:50 pm-1:25 pm
1 stop11h 35m
London Heathrow
Sun 3/21
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
Tue 3/16
8:40 pm-10:50 am
1 stop10h 10m
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
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
Washington, D.C.London
IAD Washington, D.C. Dulles Intl - LHR London Heathrow
IADLHR
Washington, D.C. Dulles Intl
Wed 1/6
6:05 pm-6:15 am
Nonstop7h 10m
London Heathrow
Wed 1/13
4:25 pm-7:55 pm
Nonstop8h 30m
Washington, D.C.London
IAD Washington, D.C. Dulles Intl - LHR London Heathrow
IADLHR
Washington, D.C. Dulles Intl
Thu 1/28
9:45 pm-10:00 am
Nonstop7h 15m
London Heathrow
Tue 2/2
12:15 pm-3:40 pm
Nonstop8h 25m
See travel insights to London from
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 typical price of a round-trip flight between Washington, D.C. Dulles Intl Airport and London Heathrow Airport?
Prices are currently low for flights on this route.
Typical prices usually range from $752 to $998.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. Dulles Intl Airport, with most prices found around $701. 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. Dulles Intl Airport 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 $924. The most expensive day to fly to London Heathrow Airport is Friday, with ticket prices averaging around $1,024.
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. Dulles Intl Airport to London Heathrow Airport in the afternoon for as low as $960. 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 $990.
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 from Washington, D.C. Dulles Intl Airport 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 weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around $909 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. Dulles Intl Airport for as low as $889 on momondo.
What cabin class options are available on Washington, D.C. Dulles Intl Airport to London Heathrow Airport flights?
There are 4 cabin classes available to choose from on Washington, D.C. Dulles Intl Airport 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.
What is the cheapest airline that flies from Washington, D.C. Dulles Intl to London Heathrow?
ITA Airways, Delta, and Virgin Atlantic 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 American 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 47% 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 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. Dulles Intl Airport and London Heathrow Airport?
Lisbon (LIS) was the most common stop: 29% of momondo users choosing 1-stop flights on this route connected there.
Which layover airport offers the lowest fares from Washington, D.C. Dulles Intl Airport 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. Dulles Intl Airport to London Heathrow Airport?
Flights connecting via Reykjavik (KEF) have the shortest average one-way travel time: 10h 20m.
Which layover airport has the shortest connection time from Washington, D.C. Dulles Intl Airport to London Heathrow Airport?
Dublin (DUB) has the shortest average layover time for this route: 1h 52m.
How many flights depart from Washington, D.C. Dulles Intl Airport to London Heathrow Airport on average per day?
30 flights are operational daily from Washington, D.C. Dulles Intl Airport to London Heathrow Airport as of October 2026. The most popular departure time for this route is 10:00PM, with 84% 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 October 2026, 210 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
Frequently asked questions about flying 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 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 October 2026, there are 17 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 (49.97% of total bookings). The next most popular plane models are Boeing 777-300ER (10.40%), Boeing 787-10 Dreamliner (7.70%), and Airbus A330-900neo (7.03%).
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 (34% of total bookings). The next most popular airlines are United Airlines (23%), American Airlines (8%), and Virgin Atlantic (8%).
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 $422 | Free Cancellation | Rating 7.2 2,383 reviews | |||
| PriceFrom $432 | Free Cancellation | Rating 7.5 694 reviews | |||
| PriceFrom $489 | Free Cancellation | Rating 6.9 758 reviews | |||
| PriceFrom $500 | Free Cancellation | Rating 7.0 3,252 reviews | |||
| PriceFrom $508 | Free Cancellation | Rating 7.8 8,651 reviews | |||
| PriceFrom $568 | Free Cancellation | Rating 7.4 2,015 reviews | |||
| PriceFrom $581 | Free Cancellation | Rating 7.5 1,650 reviews | |||
| PriceFrom $593 | Free Cancellation | Rating 7.5 2,098 reviews | |||
| PriceFrom $606 | Free Cancellation | Rating 7.6 1,425 reviews | |||
| PriceFrom $610 | Free Cancellation | Rating 7.3 1,817 reviews |
KLM Flights From Washington, D.C. Dulles Intl Airport to London Heathrow Airport
The lowest priced KLM flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport from the last 72 hours was $618. Generally, KLM has 7 flights on this route every week with an average price of $1,157. KLM is rated 7.8/10 by our users.
Delta Flights From Washington, D.C. Dulles Intl Airport to London Heathrow Airport
$508 is the best Delta flight deal from Washington, D.C. Dulles Intl Airport to London Heathrow Airport found on momondo over the last 72 hours. The average Delta ticket price found was closer to $1,050, however, with flight time and availability significantly affecting the price. Delta (7.8/10 from 8,651 user reviews) flies into London Heathrow Airport from Washington, D.C. Dulles Intl Airport 7 times in an average week so prices can vary.
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?
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.