According to their online schedule, PIA seem to be operating a new triangle route as LHE-MAN-ISB from August. This makes flights from LHE 5 weekly and to ISB 3 weekly. Going the other way, to LHE is 2 weekly, to ISB is 4 weekly:
PK709 LHE 1405 MAN 1830
PK702 MAN 2110 LHE 0845
B777-300
Flight days for PIA:
LHE-MAN-LHE: Wed, Fri,
LHE-MAN-ISB: Sun
LHE-MAN-JFK: Tue, Sat
ISB-MAN-ISB: Mon, Tue, Thu