Flight from Skardu to Islamabad is a must. You get to see amazing views of mountains. You can have an aerial view of Nanga Parbat. Although it is only 50 minutes flight but it sure is an unforgettable one. Ticket costs PKR 2190 (June 2006).
Journey through Bus from Pindi to Skardu takes around 22 Hrs. The journey is long but you travel on KKH. The road journey through bus can either be inspiring for a person who loves mountains, adventure and can endure long hours in bus or it can be tiring if a person cant take the exhaustion and straight 22 hours in bus. The buses are good, quite spaciuos and air-conditioned and cost no more than PKR 1000.