Flight Indira Gandhi International Airport departs from Delhi Indira Gandhi International Airport at 23:30 and arrives at Mumbai Chhatrapati Shivaji International Airport at 01:40.
The flighttime is about 2h 10m. The distance travelled ("as the bird flies"): 544 Km. So the average speed is roughly 251 Km.
The best day to arrive at Delhi is Thursday and it would be best to avoid Sunday, as prices are on average 34.13% higher than on Thursday. (Average prices, based on 4673872 datapoints.)
We have a lot more statistics for flights 6E 519 and between Delhi and Mumbai.