Flight Benazir Bhutto International Airport departs from Islamabad Benazir Bhutto International Airport at 08:20 and arrives at London Heathrow Airport at 13:10.
The flighttime is about 9h 50m. The distance travelled ("as the bird flies"): 8272 Km. So the average speed is roughly 841 Km.
There is an 5 hour time difference between Islamabad and London