Formia to Castelvetrano 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 Formia-Gaeta and arrive at Castelvetrano every about 3 hours on average. If travelling with Trenitalia, you need to know the Formia to Castelvetrano train schedule: the first train leaves at 22:44, while the last ride is at 23:40. A Formia to Castelvetrano train cost about 96.75 €. But how long is the train ride from Formia to Castelvetrano? Your journey takes about 16 hours on average.