Cheap flights from London to Washington, D.C. from $377
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London to Washington, D.C. departing on 12/16. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
Discover deals from 900+ travel sites with momondo.
Find the cheapest flights from London to Washington, D.C.
Cheap round-trip flights
Cheap one-way flights
Cheap last minute flights
Cheap direct flights
Save money when you book flights with momondo
Big names and deals
Big names and deals
Search 100s of travel sites to compare prices.Filter for what you want
Filter for what you want
Free Wi-Fi? Stopover? Instantly customize your results.Trusted and free
Trusted and free
We’re completely free to use - no hidden charges or fees.Price Alerts
Price Alerts
Not ready to book? to track prices.TAP AIR PORTUGAL flights from London to Washington, D.C.
Our best TAP AIR PORTUGAL deals on London to Washington, D.C. flight tickets
Virgin Atlantic flights from London to Washington, D.C.
Our best Virgin Atlantic deals on London to Washington, D.C. flight tickets
momondo Fare Finder
Use the filters below to find and compare flights from London to Washington, D.C. that are best for you.
Fly from
Fly to
Route
Depart
Return
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Mon 12/14
8:35 pm-6:30 pm
1 stop26h 55m
Washington, D.C. Dulles Intl
Mon 12/21
7:40 pm-7:30 pm
1 stop18h 50m
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Sun 12/13
8:35 pm-6:30 pm
1 stop26h 55m
Washington, D.C. Dulles Intl
Mon 12/21
7:40 pm-7:30 pm
1 stop18h 50m
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Wed 1/27
12:15 pm-3:40 pm
Nonstop8h 25m
Washington, D.C. Dulles Intl
Sun 1/31
9:45 pm-10:00 am
Nonstop7h 15m
LondonWashington, D.C.
STN London Stansted - IAD Washington, D.C. Dulles Intl
STNIAD
London Stansted
Thu 11/26
6:45 am-6:30 pm
2 stops16h 45m
Washington, D.C. Dulles Intl
Mon 11/30
7:40 pm-9:55 pm
2 stops21h 15m
LondonWashington, D.C.
LHR London Heathrow - DCA Washington, D.C. Reagan-National
LHRDCA
London Heathrow
Wed 1/27
9:10 am-6:44 pm
1 stop14h 34m
Washington, D.C. Reagan-National
Sun 1/31
3:30 pm-7:55 am
1 stop11h 25m
LondonWashington, D.C.
LTN London Luton - IAD Washington, D.C. Dulles Intl
LTNIAD
London Luton
Mon 11/23
7:45 am-2:40 pm
2 stops35h 55m
Washington, D.C. Dulles Intl
Mon 11/30
5:25 pm-8:50 pm
2 stops22h 25m
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Wed 11/25
10:00 am-3:55 pm
1 stop10h 55m
Washington, D.C. Dulles Intl
Mon 11/30
6:55 pm-7:20 am
Nonstop7h 25m
LondonWashington, D.C.
LHR London Heathrow - DCA Washington, D.C. Reagan-National
LHRDCA
London Heathrow
Thu 12/24
1:35 pm-10:45 pm
1 stop14h 10m
Washington, D.C. Reagan-National
Mon 1/4
1:00 pm-7:55 am
1 stop13h 55m
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Fri 11/20
10:00 am-3:55 pm
1 stop10h 55m
Washington, D.C. Dulles Intl
Sat 11/28
6:55 pm-7:20 am
Nonstop7h 25m
LondonWashington, D.C.
LHR London Heathrow - IAD Washington, D.C. Dulles Intl
LHRIAD
London Heathrow
Thu 12/24
4:25 pm-7:55 pm
Nonstop8h 30m
Washington, D.C. Dulles Intl
Mon 1/4
9:45 pm-10:00 am
Nonstop7h 15m
See travel insights to Washington, D.C. from
How to get the cheapest flight ticket from London to Washington, D.C.
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 London and Washington, D.C.?
Prices are currently low for flights on this route.
Typical prices usually range from $596 to $803.The lowest price recently found on this route was $528.
What is the cheapest month to fly to Washington, D.C.?
The month of February is, on average, the cheapest month to fly to Washington, D.C. from London, with most prices found around $638. If you’re not able to fly to Washington, D.C. in February, then September is your next best option. Flight prices from London to Washington, D.C. during September average around $661.
What is the cheapest day to depart on your flight to Washington, D.C.?
On average, the least expensive day to fly to Washington, D.C. from London is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as $752. However, this price may fluctuate depending on the airline, the season, and holidays. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from London to Washington, D.C. for around $837.
What is the cheapest time of day to depart on your flight to Washington, D.C.?
In the afternoon is the cheapest time of day to fly from London to Washington, D.C. when you can find flight prices for as low as $769. Flying to Washington, D.C. in the afternoon is an ideal time because this is during off-peak travel hours. Try not to purchase tickets at noon because they tend to be around $815. Of course, these prices can vary depending on the time of year and what airport you fly to.
What is the cheapest London to Washington, D.C. flight route?
Fly from London Heathrow to Washington, D.C. Dulles Intl for the best London - Washington, D.C. flight prices
How far in advance should I book a flight from London to Washington, D.C.?
You are more likely to see cheaper flights to Washington, D.C. from London when booking weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. for around $731 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. from London for as low as $622 on momondo.
What cabin class options are available on London to Washington, D.C. flights?
There are 3 cabin classes available to choose from on London to Washington, D.C. 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 London to Washington, D.C. flights?
You could potentially save up to 16% on your flight if you consider stops on a London to Washington, D.C. flight.
How have London to Washington, D.C. flight prices changed over time?
As of October 2026, prices for London to Washington, D.C. flights are approximately 0% more expensive when compared to flights at the same time last year.
What is the cheapest airline that flies from London to Washington, D.C.?
Icelandair, British Airways, and Delta are the most popular carriers operating from London to Washington, D.C.
What airlines fly to Washington, D.C.?
British Airways, Lufthansa and Virgin Atlantic are the top three most popular airlines that fly to Washington, D.C. from London 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 Washington, D.C.. Keep in mind that there are 11 different airlines that fly to Washington, D.C. on a routine basis, so you have a few additional options to choose from.
How often are flights from London to Washington, D.C. delayed?
Historically, on average around 16% of flights between London and Washington, D.C. have experienced a delay on any given week. The average delay length over the past 12 months has been 140 minutes.
What is the most punctual flight time for London to Washington, D.C. flights?
Generally, flights departing in the morning tend to experience fewer delays. Flights in the evening have, in the past, seen delays more frequently in comparison.
What day of the week experiences the fewest flight delays on this route?
Saturday 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 London to Washington, D.C. flights?
According to our data, United Airlines have had the least number of delays on this route over the last 12 months; with about 10% of their flights experiencing any sort of delay.
Which airport is the most popular layover for flights between London and Washington, D.C.?
Reykjavik (KEF) was the most common stop: 47% of momondo users choosing 1-stop flights on this route connected there.
Which layover airport offers the lowest fares from London to Washington, D.C.?
Flights via Reykjavik (KEF) offer the lowest average round-trip price of $454.
Which layover airport has the shortest travel time from London to Washington, D.C.?
Flights connecting via Amsterdam (AMS) have the shortest average one-way travel time: 10h 40m.
Which layover airport has the shortest connection time from London to Washington, D.C.?
Amsterdam (AMS) has the shortest average layover time for this route: 1h 10m.
How many flights depart from London to Washington, D.C. on average per day?
The number of flights available between London and Washington, D.C. is 28 per day as of October 2026. The most frequent departure time is 12:00PM, with 100% of daily flights leaving in the afternoon.
How many flights depart from London to Washington, D.C. on average per week?
197 flights are operational weekly from London to Washington, D.C. 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 London to Washington, D.C.
Cheap London to Washington, D.C. (LON to WAS) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from London to Washington, D.C.
Frequently asked questions about flying from London to Washington, D.C.
How far is London to Washington, D.C. by plane?
There are 3662.3 mi between London and Washington, D.C.. By plane, this route typically takes 8h 15m.
When did momondo last update prices for flights from London to Washington, D.C.?
Prices for flights from London to Washington, D.C. are updated daily.
How many operators does momondo search for flights from London to Washington, D.C.?
As of October 2026, there are 11 operators available to choose from for flights from London to Washington, D.C..
How old do you have to be to fly from London to Washington, D.C.?
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 London to Washington, D.C..
What documentation or ID do you need to fly to Washington, D.C.?
The travel and health documents you'll need for your trip to Washington, D.C. 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 Washington, D.C.. 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 London to Washington, D.C.?
momondo data reveals that the most frequently booked plane model on the route from London to Washington, D.C. is Boeing 777, representing 45.79% of all bookings. The subsequent popular models are Boeing 777-300ER at 11.64%, Boeing 767-400 at 7.06%, and Airbus A330-900neo at 6.73%.
What is the most popular airline from London to Washington, D.C.?
Based on momondo bookings for flights between London and Washington, D.C., the leading airline is British Airways, making up 20% of the total bookings. Other popular airlines include Lufthansa with 17%, United Airlines with 13%, and Icelandair with 10%.
Best airlines flying from London to Washington, D.C.
Compare and see reviews for airlines that fly from London to Washington, D.C. with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $528 | Free Cancellation | Rating 7.0 12,145 reviews | |||
| PriceFrom $535 | Free Cancellation | Rating 6.9 758 reviews | |||
| PriceFrom $556 | Free Cancellation | Rating 6.8 8,270 reviews | |||
| PriceFrom $563 | Free Cancellation | Rating 7.4 10,319 reviews | |||
| PriceFrom $566 | Free Cancellation | Rating 6.7 8,255 reviews | |||
| PriceFrom $567 | Free Cancellation | Rating 7.5 981 reviews | |||
| PriceFrom $581 | Free Cancellation | Rating 7.5 694 reviews | |||
| PriceFrom $581 | Free Cancellation | Rating 7.8 8,644 reviews | |||
| PriceFrom $582 | Free Cancellation | Rating 7.5 1,650 reviews | |||
| PriceFrom $583 | Free Cancellation | Rating 7.8 1,580 reviews |
KLM Flights From London to Washington, D.C.
The lowest priced KLM flight from London to Washington, D.C. from the last 72 hours was $583. Generally, KLM has 1 flight on this route every week with an average price of $836. KLM is rated 7.8/10 by our users.
Delta Flights From London to Washington, D.C.
Delta (7.8/10 from 8,646 reviews) operates around 1 flight from London to Washington, D.C. in any given week. The average Delta airfare for this route is around $872, with deals from around $581 rare but found on momondo. Referenced prices are for round-trip London to Washington, D.C. flight searches in the last 72 hours.
Traveling to a place near Washington, D.C.?
Book flights to Washington, D.C. if you plan to visit one of these locationsWhy use momondo?
Why should I use momondo to find a flight deal from London to Washington, D.C.?
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 Washington, D.C. from London.
Can I find flights from London to Washington, D.C. with flexible booking policies on momondo?
Yes. momondo allows you to filter the results for London to Washington, D.C. flights to just show those with flexible booking policies.
How can momondo help me find flights from London to Washington, D.C.?
Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Washington, D.C. from London.
I’m not ready to book a flight from London to Washington, D.C. right now. Can momondo alert me if prices change?
Price alerts on flights to Washington, D.C. from London are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.