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 91.60 €. But how long is the train ride from Casal di Principe to Trieste? Your journey takes about 10 hours on average. If you need to travel this week, prices start from 121.60€.