Flight Heathrow Airport departs from London Heathrow Airport at 08:10 and arrives at Chicago O'Hare International Airport at 10:45.
The flighttime is about 8h 35m. The distance travelled ("as the bird flies"): 9726 Km. So the average speed is roughly 1133 Km.
There is an 6 hour time difference between London and Chicago
INR
