Casal di Principe 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 Albanova, Napoli Centrale and arrive at Trieste Centrale, Udine every about 2 hours on average. If travelling with Trenitalia, you need to know the Casal di Principe to Trieste train schedule: the first train leaves at 06:52, while the last ride is at 19:15. A Casal di Principe to Trieste train cost about 77.8 €. But how long is the train ride from Casal di Principe to Trieste? Your journey takes about 10 hours on average.