From Roma Termini train to Latina FS Bivio then bus to Sermoneta. 1 h 44 min 7€. From Rome drive to Sermoneta. 1 h 18 min 13€.
Train from Rome to Sermoneta
Trenitalia operates a train from Rome to Sermoneta every 30 minutes. Tickets cost $4 - $21 and the journey takes 36 min. Cotral also services this route 4 times a day.