Detailed information about how to get to CERN can be found via http://home.web.cern.ch/directions .
CERN Shuttle Service
CERN also provides a regular shuttle service to and from Geneva airport during working hours. Details of pick up points and the timetable can be found via http://gs-dep.web.cern.ch/en/content/Shuttle/Circuit4 .
Details of the other shuttle routes can be found via http://gs-dep.web.cern.ch/en/content/Shuttle/New .