Flight Chhatrapati Shivaji International Airport departs from Mumbai Chhatrapati Shivaji International Airport at 10:45 and arrives at London Heathrow Airport at 16:05.
The flighttime is about 9h 50m. The distance travelled ("as the bird flies"): 8456 Km. So the average speed is roughly 860 Km.
There is an 4.5 hour time difference between Mumbai and London