The Airport Express takes just 28 minutes from the main railway station [Hauptbahnhof] to Schoenefeld airport. The specially identified regional train lines RE7 and RB14 run every half hour. Local public transport tickets are accepted on these trains. The journey is within fare zone C.
At the Schoenefeld railway station, the exits leading to the airport are clearly marked. A covered walkway leads from the station to the terminal.
Link to the Timetable