Flight O'Hare International Airport departs from Chicago O'Hare International Airport at 12:45 and arrives at San Francisco International Airport at 18:30.The flight has a short stop at Los Angeles.
The flighttime is about 7h 45m. The distance travelled ("as the bird flies"): 3832 Km. So the average speed is roughly 494 Km.
There is an 2 hour time difference between Chicago and San Francisco