Talking to private news channel, the PIA spokesperson said that the move is aimed at improving service of the national flag carrier.
Following the leasing plan, the national airline will open gates for three new destinations including Spain, Germany and Thailand, he added.
"We are already flying to New York and China, but one additional flight per week has been finalized which would help cater more passengers on these destinations", he said.
PIA plans to start five international flights between December and February, the spokesperson said.
PIA to commence flight operations to Barcelona in December, Germany in January and Bangkok at the beginning of 2017, he added.
He said the move to increase flights to China has been a stepping stone and with China Pakistan Economic Corridor (CPEC), the flow of passengers to China would increase significantly.