Flight Dulles International Airport departs from Washington Dulles International Airport at 17:28 and arrives at Mexico City Licenciado Benito Juarez International Airport at 20:15.
The flighttime is about 3h 47m. The distance travelled ("as the bird flies"): 2369 Km. So the average speed is roughly 626 Km.
There is an 1 hour time difference between Washington and Mexico City