Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 18:45 and arrives at Islamabad Benazir Bhutto International Airport at 22:20.
The flighttime is about 5h 35m. The distance travelled ("as the bird flies"): 3030 Km. So the average speed is roughly 543 Km.
There is an 2 hour time difference between Bangkok and Islamabad
