Flight Don Mueang International Airport departs from Bangkok Don Mueang International Airport at 21:30 and arrives at Hyderabad Rajiv Gandhi International Airport at 23:45.
The flighttime is about 3h 45m. The distance travelled ("as the bird flies"): 2465 Km. So the average speed is roughly 657 Km.
There is an 1.5 hour time difference between Bangkok and Hyderabad