The PML-N chief was flying from Quetta, the capital of Balochistan province, to Hasilpur district in Punjab, 400 km from Lahore, when the Challenger aircraft's window was damaged.
A total of 11 people were on board the aircraft, which was at an altitude of 9,000 feet when the incident occurred. The pilot diverted the aircraft to Lahore and made an emergency landing, Civil Aviation Authority spokesman Abid Qaimkhwani told PTI.
Besides Sharif, several senior leaders of the PML-N were in the aircraft, which was hired for the partys election campaign. No one was injured in the incident, Qaimkhwani said.