The S-Bahn train link is the simplest way to reach the city centre, the trip will only take roughly 10 minutes from the airport. Take either the S8 or S9 and you can reach Frankfurt city’s central Hauptbahnhof Station for only €4,90 (NZ$ 8.15) approx. Alternatively, you can take a taxi but this will be considerably more expensive at €35 (NZ$ 58.20) approx.