Frascati is easily reached by rail from Rome’s Termini railway station. The Rome - Frascati line runs once an hour Monday through Saturday; once every two hours Sunday and holidays. Termini railway station is connected to Leonardo da Vinci/Fiumicino Airport via the non-stop Leonardo Express. Ciampino Airport is a five minute bus or taxi ride from the Ciampino railway station which is a stop on the Rome-Frascati line.
Alternatively, Frascati can be reached by taking Rome’s Metropolitana underground A line to the Anagnina station and then switching to the Frascati bus.