Flight Heathrow Airport departs from London Heathrow Airport at 08:30 and arrives at Chicago O'Hare International Airport at 11:20.The flight has a short stop at Chicago. The flighttime is about 8h 50m. The distance travelled ("as the bird flies"): 9726 Km. So the average speed is roughly 1101 Km. There is an 6 hour time difference between London and Chicago