Sarno 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 Sarno and arrive at Castelvetrano every about 12 hours on average. If travelling with Trenitalia, you need to know the Sarno to Castelvetrano train schedule: the first train leaves at 21:28, while the last ride is at 21:28. A Sarno to Castelvetrano train cost about 85.25 €. But how long is the train ride from Sarno to Castelvetrano? Your journey takes about 16 hours on average.