Berlin-Schönefeld Flughafen (also named simply as Berlin Schönefeld) is a railway station in Schönefeld next to Berlin-Schönefeld International Airport just outside Berlin. The station is served by the S-Bahn lines S9 and S45 as well as the Regional Bahn.
It's one of the easiest ways to reach Alexanderplatz and Berlin city center if you are traveling via Berlin Schonefeld airport. The single ride ticket price is around EUR 3, and you can buy them at vending machines in tunnel connecting airport to railway station. Make sure you composter them on platform before entering the train.
Berlin Schönefeld Flughafen station
Berlin-Schönefeld railway station was built within 150 days and opened for the public on 10 July 1951 as part of the Berliner Außenring. On 26 February 1962 an additional platform was added and Schönefeld was connected to the Berlin S-Bahn.