Flight Indira Gandhi International Airport departs from Delhi Indira Gandhi International Airport at 04:15 and arrives at Riyadh King Khaled International Airport at 06:10.
The flighttime is about 4h 25m. The distance travelled ("as the bird flies"): 3385 Km. So the average speed is roughly 766 Km.
There is an 2.5 hour time difference between Delhi and Riyadh