Flight Indira Gandhi International Airport departs from Delhi Indira Gandhi International Airport at 16:30 and arrives at Kolkata Netaji Subhas Chandra Bose International Airport at 18:35.
The flighttime is about 2h 05m. The distance travelled ("as the bird flies"): 1262 Km. So the average speed is roughly 606 Km.
The best day to arrive at Delhi is Sunday and it would be best to avoid Saturday, as prices are on average 19.94% higher than on Sunday. (Average prices, based on 3013421 datapoints.)
We have a lot more statistics for flights 6E 529 and between Delhi and Kolkata.