Cheap flights from Washington, D.C. to London from £216
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 1/3. 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
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Use the filters below to find and compare flights from Washington, D.C. to London Heathrow Airport that are best for you.
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 28/12
20:30-21:40
1 stop20h 10m
London Heathrow
Thu 7/1
10:20-17:15
1 stop11h 55m
Washington, D.C.London
IAD Washington, D.C. Dulles Intl - LHR London Heathrow
IADLHR
Washington, D.C. Dulles Intl
Thu 3/12
20:30-18:50
2 stops17h 20m
London Heathrow
Fri 11/12
13:55-18:50
2 stops33h 55m
Washington, D.C.London
IAD Washington, D.C. Dulles Intl - LHR London Heathrow
IADLHR
Washington, D.C. Dulles Intl
Tue 16/3
20:40-10:50
1 stop10h 10m
London Heathrow
Tue 23/3
20:35-19:30
1 stop26h 55m
BaltimoreLondon
BWI Baltimore/Washington - LHR London Heathrow
BWILHR
Baltimore/Washington
Mon 7/12
19:40-10:50
1 stop10h 10m
London Heathrow
Sun 13/12
20:35-18:40
1 stop27h 05m
Washington, D.C.London
IAD Washington, D.C. Dulles Intl - LHR London Heathrow
IADLHR
Washington, D.C. Dulles Intl
Wed 6/1
18:05-06:15
Nonstop7h 10m
London Heathrow
Wed 13/1
16:25-19:55
Nonstop8h 30m
Washington, D.C.London
IAD Washington, D.C. Dulles Intl - LHR London Heathrow
IADLHR
Washington, D.C. Dulles Intl
Tue 30/3
22:10-10:40
Nonstop7h 30m
London Heathrow
Thu 1/4
08:45-16:45
1 stop13h 00m
Washington, D.C.London
IAD Washington, D.C. Dulles Intl - LHR London Heathrow
IADLHR
Washington, D.C. Dulles Intl
Tue 26/1
22:15-10:50
Nonstop7h 35m
London Heathrow
Thu 28/1
09:00-17:00
1 stop13h 00m
BaltimoreLondon
BWI Baltimore/Washington - LHR London Heathrow
BWILHR
Baltimore/Washington
Thu 7/1
18:55-07:05
Nonstop7h 10m
London Heathrow
Tue 12/1
13:50-17:05
Nonstop8h 15m
Washington, D.C.London
IAD Washington, D.C. Dulles Intl - LHR London Heathrow
IADLHR
Washington, D.C. Dulles Intl
Sun 21/3
19:40-10:30
1 stop10h 50m
London Heathrow
Thu 25/3
08:40-16:45
1 stop12h 05m
Washington, D.C.London
IAD Washington, D.C. Dulles Intl - LHR London Heathrow
IADLHR
Washington, D.C. Dulles Intl
Mon 9/11
18:55-07:20
Nonstop7h 25m
London Heathrow
Wed 18/11
10:00-15:55
1 stop10h 55m
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 £552 to £807.The lowest price recently found on this route was £515.
What is the cheapest month to fly to London Heathrow Airport?
In general, February is the cheapest month to fly from Washington, D.C. to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £526. The month of January is another great option to travel to London Heathrow Airport, with average flight prices from Washington, D.C. averaging around £558.
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. is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as £625. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Wednesday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Wednesday is £769.
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 £691. 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 evening when prices are £694 on average. Flights to London Heathrow Airport from Washington, D.C. in the evening are generally more expensive because this time of day is more convenient for travellers’ schedules.
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 £688 when searching weeks before you fly. 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 £673 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 11% 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?
British Airways, Delta, and United Airlines are the most popular carriers operating from Washington, D.C. to London Heathrow
Which airlines fly to London Heathrow Airport?
British Airways, United Airlines and Virgin Atlantic 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 44% of people opting to fly with this airline when travelling to London Heathrow Airport. Keep in mind that there are 5 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 departing 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 that experiences the fewest 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 fewest 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 for stopovers for flights between Washington, D.C. and London Heathrow Airport?
Reykjavik (KEF) was the most common stop: 60% of momondo users choosing one-stop flights on this route connected there.
Which stopover airport offers the lowest fares from Washington, D.C. to London Heathrow Airport?
Flights via Dublin (DUB) offer the lowest average return price of £550.
Which stopover airport has the shortest travel time from Washington, D.C. to London Heathrow Airport?
Flights connecting via Dublin (DUB) have the shortest average one-way travel time: 9h 50m.
Which stopover airport has the shortest connection time from Washington, D.C. to London Heathrow Airport?
Reykjavik (KEF) has the shortest average stopover time for this route: 1h 21m.
How many flights depart from Washington, D.C. to London Heathrow Airport on average per day?
29 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 22:00, 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?
203 flights are operational weekly from Washington, D.C. to London Heathrow Airport as of October 2026. The most popular departure day for this route is Wed, with 18% of flights per week 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?
There are 3649.4 mi between Washington, D.C. and London Heathrow. By plane, this route typically takes 7h 10m.
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 are refreshed on a daily basis.
How many operators does momondo search for flights from Washington, D.C. to London Heathrow Airport?
As of October 2026, there are 5 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?
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. 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. to London Heathrow Airport?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Washington, D.C. to London Heathrow Airport 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 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 24% of all bookings. The subsequent popular airlines are Icelandair at 20%, Aer Lingus at 18%, and American Airlines at 14%.
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 £236 | Free Cancellation | Rating 6.9 758 reviews | |||
| PriceFrom £436 | Free Cancellation | Rating 6.7 8,255 reviews | |||
| PriceFrom £457 | Free Cancellation | Rating 7.5 694 reviews | |||
| PriceFrom £501 | Free Cancellation | Rating 7.4 10,331 reviews | |||
| PriceFrom £603 | Free Cancellation | Rating 7.8 8,651 reviews |
Delta Flights From Washington, D.C. to London Heathrow Airport
The lowest priced Delta flight from Washington, D.C. to London Heathrow Airport from the last 72 hours was £603. Generally, Delta has 7 flights on this route every week with an average price of £979. Delta is rated 7.8/10 by our users.
Virgin Atlantic Flights From Washington, D.C. to London Heathrow Airport
Across 694 Virgin Atlantic reviews on momondo, the average score is 7.5/10. Virgin Atlantic flies from Washington, D.C. to London Heathrow Airport about 7 times each week, with ticket deals ranging from £457 to £601. Price data is based on momondo searches in the last 72 hours.
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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?
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?
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?
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?
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.