There are three different buses that run between the University campus and the City Centre:
Bus Eireann: 304
Dublin Coach 307 & 308
The main City Centre stop is William St., and the Campus stop is the UL Campus Stables
Buses to Limerick City:
Bus Eireann’s 343 service runs between Shannon Airport and Limerick City.
Eireagle runs a service from Dublin Airport to Limerick City.
J.J. Kavanagh also runs a direct route from Dublin Airport to the UL Campus, but be aware that this is a very slow service!
A taxi from the UL Campus to the City Centre generally runs between €11 – €20.
Limerick City is also served by trains from Dublin City. Be aware that the Limerick City station is Limerick Colbert (NOT Limerick Junction).