The city of Berlin and the surrounding suburbs have been organized into three tariff zones A, B and C. You can buy tickets for the combined zones AB, BC or ABC, as needed. Adults pay regular fare; The reduced fare is valid for children aged 6 to 14. Children under 6 do not need tickets.
Berlin’s inner city up to and including the S-Bahn (urban rail) ring
Outside the S-Bahn (urban rail) ring
up to the city boundary; Airport Berlin Tegel TXL is located in this zone.
Greater Berlin area (approx. 15 km around the city of Berlin), including the City of Potsdam and Airport Berlin Schönefeld SFX
A more detailed map of the Berlin zones can be downloaded here (PDF). You will require a copy of Adobe Acrobat reader in order to view it.
You can download a free copy of Acrobat at the Adobe Acrobat website.