Nettuno to Viterbo 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 Nettuno and arrive at Viterbo Porta Fiorentina every about 2 hours on average. If travelling with Trenitalia, you need to know the Nettuno to Viterbo train schedule: the first train leaves at 06:30, while the last ride is at 20:07. A Nettuno to Viterbo train cost about 9.5 €. But how long is the train ride from Nettuno to Viterbo? Your journey takes about 4 hours on average.