Flight McCarran International Airport departs from Las Vegas McCarran International Airport at 05:15 and arrives at Chicago O'Hare International Airport at 13:05.The flight has a short stop at Dallas.
The flighttime is about 5h 50m. The distance travelled ("as the bird flies"): 3028 Km. So the average speed is roughly 519 Km.
There is an 2 hour time difference between Las Vegas and Chicago