The Bhoja Air flight from Karachi came down in fields near a residential area on the edge of the Pakistani capital on Friday evening, as it was attempting to land at the city's international airport.
Civil aviation official Junaid Khan told AFP: "All 127 people died. No one survived. There was no possibility of any survivor in this crash."
Doctor Waseem Khawaja, who is in charge of Islamabad's main hospital, the Pakistan Institute of Medical Sciences, said bodies had been brought in more than 100 bags.
"There was no survivor, all on board are dead," Khawaja told AFP.
Witnesses said the plane burst into flames after crashing, but Waseem said most of the bodies were not charred and 73 had been identified already.