Monterotondo 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 Monterotondo-Mentana and arrive at Siderno every about 6 hours on average. If travelling with Trenitalia, you need to know the Monterotondo to Siderno train schedule: the first train leaves at 09:02, while the last ride is at 22:02. A Monterotondo to Siderno train cost about 61.8 €. But how long is the train ride from Monterotondo to Siderno? Your journey takes about 10 hours on average.