Flight Indira Gandhi International Airport departs from Delhi Indira Gandhi International Airport at 19:30 and arrives at Kolkata Netaji Subhas Chandra Bose International Airport at 21:40.
The flighttime is about 2h 10m. The distance travelled ("as the bird flies"): 1262 Km. So the average speed is roughly 582 Km.
The best day to arrive at Delhi is Tuesday and it would be best to avoid Saturday, as prices are on average 151.87% higher than on Tuesday. (Average prices, based on 2476440 datapoints.)
We have a lot more statistics for flights SG 8251 and between Delhi and Kolkata.