Mentana to Siderno 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 Roma Termini, Monterotondo-Mentana and arrive at Siderno every about 2 hours on average. If travelling with Trenitalia, you need to know the Mentana to Siderno train schedule: the first train leaves at 07:35, while the last ride is at 22:50. A Mentana to Siderno train cost about 56.4 €. But how long is the train ride from Mentana to Siderno? Your journey takes about 10 hours on average.