Flight Heathrow Airport departs from London Heathrow Airport at 12:30 and arrives at Mumbai Chhatrapati Shivaji International Airport at 01:45.
The flighttime is about 8h 45m. The distance travelled ("as the bird flies"): 8456 Km. So the average speed is roughly 966 Km.
There is an 4.5 hour time difference between London and Mumbai