Schönefeld is situated approximately 18 km south-east of the city centre. This is the old East Berlin Airport where most Charter Flight companies fly to. The easier way to get into town is by Airport Express which will get you to the Ku'damm in around 30 minutes. Otherwise take the 171 bus to Rudow U-Bahn station and get to the Zoo by U7 (Underground Line 7) or to to S-Bahn (surface rail) where you can travel by S9 to Alexanderplatz.
A Taxi ride will cost about € 30.00 - 35.00.
By surface rail (S-Bahn): S 45, S 9
By Bus: X7, 162, 163, 171, 734, 736, N60, N71
See the airport map