Flight Indira Gandhi International Airport departs from Delhi Indira Gandhi International Airport at 15:10 and arrives at Dehradun Dehradun Airport at 16:00.
The flighttime is about 0h 50m. The distance travelled ("as the bird flies"): 125 Km. So the average speed is roughly 150 Km.
The best day to arrive at Delhi is Monday and it would be best to avoid Saturday, as prices are on average 115.51% higher than on Monday. (Average prices, based on 120556 datapoints.)
We have a lot more statistics for flights 6E 2135 and between Delhi and Dehradun.