The cheapest times to fly from IAD to LHR are
- January 8th to April 1st
- August 20th to December 9th (except the weeks of August 27th and October 8th)
based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from IAD to LHR is late January. Prices can be as high as $1109 for Saturday flights during late June, or as low as $398 for Monday flights around late January.
When to Fly to London
Flying from Washington, DC (IAD) to London (LHR) will usually cost between $436 to $911 per person if booking more than four weeks in advance. On average the very cheapest time to fly is late January with an average ticket price of $454. Due to high demand the most expensive time to fly is late June, with an average price of $921. Planning your trip to low-cost times can easily save you $467 on economy flights and even more on first-class flights. Generally, any price below $519 can be considered a good price for a round-trip IAD to LHR flight.
See below for a graph of average weekly prices for the IAD to LHR route. All prices are for round-trip tickets in USD.
Compared to other flights, the IAD to LHR flight is cheaper than the average and costs much less than the average flight leaving from Washington. The average price per mile (for a direct flight) is $0.09, which is far below average.
Flight Prices by Day of the Week
Monday is usually the cheapest day to fly to LHR, and Wednesday the cheapest day to fly back into IAD. Saturdays are the most expensive days to fly out or take a return trip. Selecting flights on the least expensive days could save you up to $121 (17%) on this flight.
Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Monday and returning a week later will cost an average of $538. Return trip prices are from the LHR to IAD flight, and often highlight the quality of our data in showing the same trend.
Departing Prices by Day
Return Trip Prices by Day
Nonstop Flights and Layovers
Travelers looking to fly from IAD to LHR can generally find a 0-layover flight. Because there is a direct flight option the real-world direct flight time of 7 hour 35 minutes may be realistic.
Flight Questions Answered
Still have questions about flying from IAD to LHR? We’ve got answers.
Which airlines fly this route?
You can find 27 major airlines flying this route most often: Aer Lingus, Aeroflot, Aeromexico, Air Canada, Air France, Alaska, Alitalia, American, Austrian, British Airways, Brussels Airlines, Delta, Eurowings, Finnair, Iberia, Icelandair, KLM, LOT, Lufthansa, Royal Air Maroc, SAS, SWISS, Tap Air Portugal, Turkish Airlines, United, Virgin Atlantic, Wizz Air, and potentially more during busy seasons.
How far away is it from London Heathrow Airport to Washington Dulles International Airport?
The distance between the two airports is roughly 3667 miles or 5901 kilometers.
How long does it take to fly from IAD to LHR?
The real-world flight time for a nonstop IAD to LHR flight is about 7 hour 35 minutes.
How many flights go between Washington, DC and London?
It depends on the day of the week and the date, but a typical day might have around 87 available flights from IAD to LHR.
Airport Location Info
|Origination airport name||Washington Dulles International Airport|
|Country||the United States|
|Destination airport name||London Heathrow Airport|
|Country||the United Kingdom|
Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.