Flight Chhatrapati Shivaji International Airport departs from Mumbai Chhatrapati Shivaji International Airport at 12:25 and arrives at London Heathrow Airport at 18:10.
The flighttime is about 10h 15m. The distance travelled ("as the bird flies"): 8456 Km. So the average speed is roughly 825 Km.
There is an 4.5 hour time difference between Mumbai and London