Monterotondo to Velletri trains might be a good value for money solution: travelling in Italy by train is often rather cheap and faster than taking a bus indeed Trains leave from Monterotondo-Mentana and arrive at Velletri every 60 minutes on average. If travelling with Trenitalia, you need to know the Monterotondo to Velletri train schedule: the first train leaves at 05:17, while the last ride is at 21:32. A Monterotondo to Velletri train cost about 4.0 €. But how long is the train ride from Monterotondo to Velletri? Your journey takes about 2 hours on average.