Flight Chhatrapati Shivaji International Airport departs from Mumbai Chhatrapati Shivaji International Airport at 10:20 and arrives at Dehradun Dehradun Airport at 12:20.
The flighttime is about 2h 00m. The distance travelled ("as the bird flies"): 664 Km. So the average speed is roughly 332 Km.
The best day to arrive at Mumbai is Tuesday and it would be best to avoid Sunday, as prices are on average 52.74% higher than on Tuesday. (Average prices, based on 54199 datapoints.)
We have a lot more statistics for flights SG 285 and between Mumbai and Dehradun.