From Medan there is a local bus (no air-con) about every hour for 22,000 rupiah (Oct 08) if you pay on the bus. The journey takes 4-6 hours, depending on the traffic condition.

From Medan RAJA Taxi +62 (0)617 366 555 will pick you up at the airport. Scheduled runs in an Avanza (5 person car) will cost you 80,000 IDR per person (Dec 08). Alternatively, you can book the whole car for 400,000 IDR.