By Train
From Roma Termini train station: regional train "Trenitalia" (Castelli Romani Trainline) with stop "Frascati" (takes about 30 minutes).
From Ciampino Airport: "Ciampino Airlink station" to "Ciampino train station". Then regional train "Trenitalia" (Castelli Romani Trainline) with stop "Frascati" (takes about 15 minutes).
From Fiuminicino Airport: The most convenient way to reach Frascati is to go through Termini station (see "From Roma Termini train station"). Termini station can be reached by "Leonardo express" train (cost €14, takes 32 minutes).