Flight O'Hare International Airport departs from Chicago O'Hare International Airport at 16:30 and arrives at London Heathrow Airport at 06:45.The flight has a short stop at London.
The flighttime is about 8h 15m. The distance travelled ("as the bird flies"): 9726 Km. So the average speed is roughly 1179 Km.
There is an 6 hour time difference between Chicago and London