Flight Dulles International Airport departs from Washington Dulles International Airport at 06:30 and arrives at Cancun International Airport at 13:14.The flight has a short stop at Chicago.
The flighttime is about 7h 44m. The distance travelled ("as the bird flies"): 1070 Km. So the average speed is roughly 138 Km.
There is an 1 hour time difference between Washington and Cancun