Pakistan Air Commodore Himayun Viqar said the Indian aircraft crossed over the border some one to three miles (two to four kilometers) in Pakistan-controlled Kashmir and over the eastern city of Lahore.
He would not say how many Indian aircraft were involved or give the exact time but said that Pakistani jets responded, forcing the Indian aircraft to turn back.
Attempts to get Indian comment were not immediately successful early Sunday morning.
However, in a statement, Pakistan Information Minister Sherry Rehman said the Indian Air Force had told Pakistan the incursion was "inadvertent."
"Our forces are on alert," Rehman said, adding, "There is no need for undue alarm."