Flight La Guardia Airport departs from New York La Guardia Airport at 13:25 and arrives at Las Vegas McCarran International Airport at 15:55.The flight has a short stop at Dallas.
The flighttime is about 5h 30m. The distance travelled ("as the bird flies"): 4586 Km. So the average speed is roughly 834 Km.
There is an 3 hour time difference between New York and Las Vegas