The flight time from Washington Dulles International Airport to London Heathrow Airport is:

7 hours, 51 minutes

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Flying time from IAD to LHR

The total flight duration from IAD to LHR is 7 hours, 51 minutes.

This assumes an average flight speed for a commercial airliner of 500 mph, which is equivalent to 805 km/h or 434 knots. It also adds an extra 30 minutes for take-off and landing. Your exact time may vary depending on wind speeds.

If you're planning a trip, remember to add more time for the plane to taxi between the gate and the airport runway. This measurement is only for the actual flying time. You should also factor in airport wait times and possible equipment or weather delays. If you're trying to figure out what time you'll arrive at the destination, you may want to see if there's a time difference between IAD and LHR.

The calculation of flight time is based on the straight line flight distance from IAD to LHR ("as the crow flies"), which is about 3,676 miles or 5 917 kilometers.

Your trip begins at Washington Dulles International Airport in Dulles, Virginia.
It ends at London Heathrow Airport in London, United Kingdom.

Your flight direction from IAD to LHR is Northeast (49 degrees from North).

The flight time calculator measures the average flight duration between points. It uses the great circle formula to compute the travel mileage.

Washington Dulles International Airport

City: Dulles
State: Virginia
Zip code: 20166
Country: United States
Category: airports

London Heathrow Airport

City: London
Country: United Kingdom
Category: airports

Flight time calculator

Travelmath provides an online flight time calculator for all types of travel routes. You can enter airports, cities, states, countries, or zip codes to find the flying time between any two points. The database uses the great circle distance and the average airspeed of a commercial airliner to figure out how long a typical flight would take. Find your travel time to estimate the length of a flight between airports, or ask how long it takes to fly from one city to another.