Portici 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 Portici-Ercolano and arrive at Trieste Centrale every 30 minutes on average. If travelling with Trenitalia, you need to know the Portici to Trieste train schedule: the first train leaves at 07:00, while the last ride is at 22:50. A Portici to Trieste train cost about 70.1 €. But how long is the train ride from Portici to Trieste? Your journey takes about 11 hours on average.