Flight Indira Gandhi International Airport departs from Delhi Indira Gandhi International Airport at 14:40 and arrives at Patna Lok Nayak Jayaprakash Airport at 16:50.
The flighttime is about 2h 10m. The distance travelled ("as the bird flies"): 888 Km. So the average speed is roughly 410 Km.
The best day to arrive at Delhi is Friday and it would be best to avoid Sunday, as prices are on average 118.86% higher than on Friday. (Average prices, based on 334246 datapoints.)
We have a lot more statistics for flights SG 875 and between Delhi and Patna.