Flight McCarran International Airport departs from Las Vegas McCarran International Airport at 14:15 and arrives at Washington Dulles International Airport at 11:20.The flight has a short stop at New York.
The flighttime is about 18h 05m. The distance travelled ("as the bird flies"): 4190 Km. So the average speed is roughly 232 Km.
There is an 3 hour time difference between Las Vegas and Washington