Travelling Expenses / person (current) from Karachi- Islamabad:
By Air: Rs. 17000/- approx return ticket ( but time saving)
By Train: Economy Class: Rs. 1350/-, Business Class: Rs. 3800/-, AC Sleeper: 5850/- ( within 26-28 hrs)
By Deawoo: Rs. 4350/- (within 24 hrs)
By Road over own Car: Average Rs. 8000/- to 9000/- (depending upon CAR condition and CC (this is for good conditioned Cultus and City)
now its upto you.. that which mode of transport u have selected.
Take care and good wishes for your trip.