Getting to Mainz
By plane
There are two airports nearby:

1) Flughafen Frankfurt Rhein-Main, continental Europe’s largest airport. Flughafen Rhein-Main

The easiest way to get from the airport to Mainz HBF (main station) is by direct long-distance rail service (about 20 minutes) or regional rail and S-Bahn connections (between 20 to 40 minutes). The S-Bahn calling at Mainz HBF is “S 8” (direction Wiesbaden). Do not take trains that terminate in or call at Mainz-Kastell, as these do not stop in Mainz! Reiseauskunftsdienst RMV/Fraport

2) Hahn Airport is further away to the east of Mainz but has the advantage of budget connections to many European cities. Flughafen Frankfurt Hahn/Hunsrück

There is an airport shuttle bus that takes you in 70 minutes from Hahn airport to Mainz Central Train Station. Airportshuttlebus

By train
For rail services within Germany see the homepage of Deutsche Bahn:

Mainz Central Station is very close to the university campus. Take one of the following bus lines and alight at "Universität". Bus lines that take you to the campus are 6, 6a, 9, 45, 54, 55, 56, 57, 58, 64, 65, 68, 69. The bus stop is located on the right hand side of the station's main entrance.

By car
See map below.
Map Mainz
Campus map