Flight Indira Gandhi International Airport departs from Delhi Indira Gandhi International Airport at 10:00 and arrives at Mumbai Chhatrapati Shivaji International Airport at 12:25.
The flighttime is about 2h 25m. The distance travelled ("as the bird flies"): 544 Km. So the average speed is roughly 225 Km.
The best day to arrive at Delhi is Friday and it would be best to avoid Saturday, as prices are on average 51.22% higher than on Friday. (Average prices, based on 5997016 datapoints.)
We have a lot more statistics for flights AI 865 and between Delhi and Mumbai.