Flight Chhatrapati Shivaji International Airport departs from Mumbai Chhatrapati Shivaji International Airport at 10:00 and arrives at Delhi Indira Gandhi International Airport at 12:20.
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 Mumbai is Friday and it would be best to avoid Monday, as prices are on average 70% higher than on Friday. (Average prices, based on 7882915 datapoints.)
We have a lot more statistics for flights QF 5318 and between Mumbai and Delhi.