Fondi 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 Fondi-Sperlonga and arrive at Siderno every about 4 hours on average. If travelling with Trenitalia, you need to know the Fondi to Siderno train schedule: the first train leaves at 07:52, while the last ride is at 22:10. A Fondi to Siderno train cost about 60.9 €. But how long is the train ride from Fondi to Siderno? Your journey takes about 9 hours on average.