Gaithersburg (GAI) → Washington (IAD)
Montgomery County Airpark → Washington Dulles International Airport
Departure times are local to airport GAI.
Gaithersburg (GAI) — Washington (IAD): how long is the flight?
GAI — IAD: scheduled duration in the saved data is 58 min, the median of available flights.
GAI — IAD: what is the distance?
The straight-line distance between airports GAI and IAD is about 35 km, not the actual flight path.