Cheap flights from Washington, D.C. to London from $285
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 3/1. 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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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 - LTN London Luton
IADLTN
Washington, D.C. Dulles Intl
Tue 12/1
9:05 am-11:45 am
2 stops21h 40m
London Luton
Sun 12/6
9:30 pm-3:55 pm
2 stops23h 25m
Washington, D.C.London
IAD Washington, D.C. Dulles Intl - LGW London Gatwick
IADLGW
Washington, D.C. Dulles Intl
Tue 1/5
7:40 pm-2:50 pm
1 stop14h 10m
London Gatwick
Sun 1/10
7:00 am-6:30 pm
1 stop16h 30m
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
Fri 11/13
10:30 pm-6:55 pm
1 stop15h 25m
London Heathrow
Wed 11/25
6:30 pm-3:15 pm
1 stop25h 45m
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
BaltimoreLondon
BWI Baltimore/Washington - LHR London Heathrow
BWILHR
Baltimore/Washington
Mon 12/7
7:40 pm-10:50 am
1 stop10h 10m
London Heathrow
Sun 12/13
8:35 pm-6:40 pm
1 stop27h 05m
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
BaltimoreLondon
BWI Baltimore/Washington - LHR London Heathrow
BWILHR
Baltimore/Washington
Thu 1/7
6:55 pm-7:05 am
Nonstop7h 10m
London Heathrow
Tue 1/12
1:50 pm-5:05 pm
Nonstop8h 15m
See travel insights to London from
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?
Prices are currently low for flights on this route.
Typical prices usually range from $694 to $990.The lowest price recently found on this route was $680.
What is the cheapest month to fly to London?
The cheapest month to fly to London from Washington, D.C. is in February. Flight prices, which tend to average around $674, are often lower during this time because this is during the off-season. The month of January is another great option to travel to London, with average flight prices from Washington, D.C. averaging around $698.
What is the cheapest day to depart on your flight to London?
The cheapest day to depart from Washington, D.C. to London is on a Wednesday. Travelers who choose to depart for London on a Wednesday will often find tickets for as low as $924. If your travel schedule is flexible, try to avoid departing on a Friday because tickets tend to average around $1,023. These prices are subject to change though, so be sure to set up a Price Alert for flights to London.
What is the cheapest time of day to depart on your flight to London?
Flying to London from Washington, D.C. in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $960 when looking at flights departing in the afternoon. Flights to London are more costly in the evening, with an average ticket price of $989. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.
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 from Washington, D.C. to London?
You are more likely to see cheaper flights to London from Washington, D.C. when booking weeks ahead of your departure date. In general, you can expect to find flights to London 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 from Washington, D.C. for as low as $889 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.
Can stopping save me money on Washington, D.C. to London flights?
You could potentially save up to 19% on your flight if you consider stops on a Washington, D.C. to London flight.
How have Washington, D.C. to London flight prices changed over time?
As of October 2026, prices for Washington, D.C. to London flights are approximately 3% more expensive when compared to flights at the same time last year.
What is the cheapest airline that flies from Washington, D.C. to London?
Icelandair, Delta, and United Airlines are the most popular carriers operating from Washington, D.C. to London
What airlines fly to London?
British Airways, United Airlines and Icelandair 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 50% of people opting to fly with this airline when traveling to London. Keep in mind that there are 18 different airlines that fly to London 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 17% 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 173 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?
Reykjavik (KEF) was the most common stop: 56% 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?
Flights via Lisbon (LIS) offer the lowest average round-trip price of $418.
Which layover airport has the shortest travel time from Washington, D.C. to London?
Flights connecting via New York (JFK) have the shortest average one-way travel time: 9h 45m.
Which layover airport has the shortest connection time from Washington, D.C. to London?
New York (JFK) has the shortest average layover time for this route: 1h 18m.
How many flights depart from Washington, D.C. to London on average per day?
29 flights are operational daily from Washington, D.C. to London 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 on average per week?
As of October 2026, there are 203 flights per week flying from Washington, D.C. to London. The most common day of the week flights depart is Wed, with 18% of flights 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
Frequently asked questions about flying from Washington, D.C. to London
How far is Washington, D.C. to London by plane?
Washington, D.C. and London are 3662.3 mi apart from one another. A reasonable flight in good conditions will take 7h 10m.
When did momondo last update prices for flights from Washington, D.C. to London?
Prices for flights from Washington, D.C. to London were last updated today.
How many operators does momondo search for flights from Washington, D.C. to London?
As of October 2026, there are 18 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?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to 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 this flight route, the most popular plane model on flight routes from Washington, D.C. to London is Boeing 777 (51.57% of total bookings). The next most popular plane models are Boeing 777-300ER (9.21%), Boeing 787-10 Dreamliner (8.05%), and Airbus A330-900neo (6.75%).
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 30% of all bookings. The subsequent popular airlines are United Airlines at 17%, Icelandair at 14%, and American Airlines at 9%.
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 $422 | Free Cancellation | Rating 7.2 2,385 reviews | |||
| PriceFrom $432 | Free Cancellation | Rating 7.5 694 reviews | |||
| PriceFrom $462 | Free Cancellation | Rating 7.4 10,319 reviews | |||
| PriceFrom $465 | Free Cancellation | Rating 6.9 758 reviews | |||
| PriceFrom $500 | Free Cancellation | Rating 7.0 3,252 reviews | |||
| PriceFrom $508 | Free Cancellation | Rating 7.8 8,644 reviews | |||
| PriceFrom $568 | Free Cancellation | Rating 7.4 2,010 reviews | |||
| PriceFrom $581 | Free Cancellation | Rating 7.5 1,650 reviews | |||
| PriceFrom $590 | Free Cancellation | Rating 6.7 8,255 reviews | |||
| PriceFrom $593 | Free Cancellation | Rating 7.5 2,094 reviews |
KLM Flights From Washington, D.C. to London
The lowest priced KLM flight from Washington, D.C. to London from the last 72 hours was $618. Generally, KLM has 2 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. to London
Delta (7.8/10 from 8,645 reviews) operates around 2 flights from Washington, D.C. to London in any given week. The average Delta airfare for this route is around $993, with deals from around $508 rare but found on momondo. Referenced prices are for round-trip Washington, D.C. to London flight 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?
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?
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 helps you find the best flight between Washington, D.C. and London by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.
I’m not ready to book a flight from Washington, D.C. to London right now. Can momondo alert me if prices change?
Yes momondo offers price alerts on flights to London from Washington, D.C.. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.