Flight International Airport departs from Los Angeles International Airport at 20:30 and arrives at Chicago O'Hare International Airport at 14:45.The flight has a short stop at Denver.
The flighttime is about 16h 15m. The distance travelled ("as the bird flies"): 3389 Km. So the average speed is roughly 209 Km.
There is an 2 hour time difference between Los Angeles and Chicago