Naples to Trieste 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 Trieste Centrale every about 3 hours on average. If travelling with Trenitalia, you need to know the Naples to Trieste train schedule: the first train leaves at 16:00, while the last ride is at 17:10. A Naples to Trieste train cost about 79.80 €. But how long is the train ride from Naples to Trieste? Your journey takes about 7 hours on average. Thanks to Trenitalia, offers, you can save on your trip from Naples to Trieste and find low cost tickets starting from 55 €!