Flight Benazir Bhutto International Airport departs from Islamabad Benazir Bhutto International Airport at 03:35 and arrives at Doha International Airport at 05:15.
The flighttime is about 3h 40m. The distance travelled ("as the bird flies"): 2427 Km. So the average speed is roughly 662 Km.
There is an 2 hour time difference between Islamabad and Doha