One of the easiest and cheapest ways to get to the Sabiha Gökçen Airport (Asian side) from the Kadıköy area is by Havataş Airport bus. Costing only 10TL the buses run regularly from the bus station at the Kadıköy waterfront area (P2 zone). Targeting a weekday 9:00am airport arrival, I took the 7:15am departure from Kadıköy, allowing for peak hour traffic. We arrived just after 8:30am. The alternatives are taxi or metro+taxi.