Portici to Nettuno 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 Nettuno every 60 minutes on average. If travelling with Trenitalia, you need to know the Portici to Nettuno train schedule: the first train leaves at 07:00, while the last ride is at 19:55. A Portici to Nettuno train cost about 12.3 €. But how long is the train ride from Portici to Nettuno? Your journey takes about 4 hours on average.