Flight Indira Gandhi International Airport departs from Delhi Indira Gandhi International Airport at 10:45 and arrives at Mumbai Chhatrapati Shivaji International Airport at 13:05.
The flighttime is about 2h 20m. The distance travelled ("as the bird flies"): 544 Km. So the average speed is roughly 233 Km.
The best day to arrive at Delhi is Saturday and it would be best to avoid Tuesday, as prices are on average 63.16% higher than on Saturday. (Average prices, based on 4674597 datapoints.)
We have a lot more statistics for flights AI 865 and between Delhi and Mumbai.