Flight Indira Gandhi International Airport departs from Delhi Indira Gandhi International Airport at 11:00 and arrives at Bangkok Don Mueang International Airport at 16:55.
The flighttime is about 4h 25m. The distance travelled ("as the bird flies"): 2591 Km. So the average speed is roughly 587 Km.
There is an 1.5 hour time difference between Delhi and Bangkok