Flight Indira Gandhi International Airport departs from Delhi Indira Gandhi International Airport at 10:40 and arrives at Varanasi Lal Bahadur Shastri Airport at 12:10.
The flighttime is about 1h 30m. The distance travelled ("as the bird flies"): 642 Km. So the average speed is roughly 428 Km.
The best day to arrive at Delhi is Thursday and it would be best to avoid Wednesday, as prices are on average 239.25% higher than on Thursday. (Average prices, based on 189136 datapoints.)
We have a lot more statistics for flights AI 406 and between Delhi and Varanasi.