Flight Indira Gandhi International Airport departs from Delhi Indira Gandhi International Airport at 14:45 and arrives at Mumbai Chhatrapati Shivaji International Airport at 17:00.
The flighttime is about 2h 15m. The distance travelled ("as the bird flies"): 544 Km. So the average speed is roughly 242 Km.
The best day to arrive at Delhi is Saturday and it would be best to avoid Thursday, as prices are on average 43.7% higher than on Saturday. (Average prices, based on 4682853 datapoints.)
We have a lot more statistics for flights AI 856 and between Delhi and Mumbai.