Flight Dulles International Airport departs from Washington Dulles International Airport at 15:38 and arrives at Mexico City Licenciado Benito Juarez International Airport at 19:45.
The flighttime is about 5h 07m. The distance travelled ("as the bird flies"): 2369 Km. So the average speed is roughly 463 Km.
There is an 1 hour time difference between Washington and Mexico City