Flight Indira Gandhi International Airport departs from Delhi Indira Gandhi International Airport at 10:35 and arrives at Doha International Airport at 12:10.
The flighttime is about 4h 05m. The distance travelled ("as the bird flies"): 2844 Km. So the average speed is roughly 696 Km.
There is an 2.5 hour time difference between Delhi and Doha
The best day to arrive at Delhi is Thursday and it would be best to avoid Saturday, as prices are on average 361.12% higher than on Thursday. (Average prices, based on 106155 datapoints.)
We have a lot more statistics for flights QR 571 and between Delhi and Doha.