The accident took place at about 10.20 am when two trainer planes slammed into one another while on a routine training flight over the Rashakai area of Nowshera, a district some 100 km northwest of Pakistan's capital of Islamabad.
Geo News said that two training jets crashed in the suburban area of Rashakai, killing four pilots.
One plane crashed into a field while another fell on a house in a residential area of Rashakai in Khyber Pakhtunkhwa province.
Eyewitnesses said a huge fire erupted after a plane crashed into the residential area.
The two planes had taken off from an air base in Resalpur, a town to the north of Nowshera.