Portici to Treviglio 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 Treviglio every about 1 hour on average. If travelling with Trenitalia, you need to know the Portici to Treviglio train schedule: the first train leaves at 07:35, while the last ride is at 20:30. A Portici to Treviglio train cost about 65.6 €. But how long is the train ride from Portici to Treviglio? Your journey takes about 7 hours on average.