Flight International Airport departs from Los Angeles International Airport at 12:50 and arrives at Chicago O'Hare International Airport at 23:28.The flight has a short stop at Phoenix.
The flighttime is about 8h 38m. The distance travelled ("as the bird flies"): 3389 Km. So the average speed is roughly 393 Km.
There is an 2 hour time difference between Los Angeles and Chicago