Frosinone 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 Frosinone and arrive at Siderno every about 2 hours on average. If travelling with Trenitalia, you need to know the Frosinone to Siderno train schedule: the first train leaves at 05:41, while the last ride is at 20:23. A Frosinone to Siderno train cost about 78.4 €. But how long is the train ride from Frosinone to Siderno? Your journey takes about 11 hours on average.