Naples to Grotte Santo Stefano 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 Napoli Centrale and arrive at Grotte S. Stefano every about 1 hour on average. If travelling with Trenitalia, you need to know the Naples to Grotte Santo Stefano train schedule: the first train leaves at 06:10, while the last ride is at 19:30. A Naples to Grotte Santo Stefano train cost about 30.9 €. But how long is the train ride from Naples to Grotte Santo Stefano? Your journey takes about 3 hours on average.