Flight Chhatrapati Shivaji International Airport departs from Mumbai Chhatrapati Shivaji International Airport at 21:30 and arrives at Delhi Indira Gandhi International Airport at 23:55.
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 month to arrive at Mumbai is September and the most expensive month to fly is May. (Average prices, based on 410 datapoints.)
We have a lot more statistics for flights SG 511 and between Mumbai and Delhi.