Flight Dulles International Airport departs from Washington Dulles International Airport at 22:30 and arrives at Lisbon Humberto Delgado Airport at 10:35. The flighttime is about 7h 05m. The distance travelled ("as the bird flies"): 7596 Km. So the average speed is roughly 1072 Km. There is an 5 hour time difference between Washington and Lisbon
