Potenza 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 Potenza Superiore and arrive at Viterbo Porta Fiorentina every about 12 hours on average. If travelling with Trenitalia, you need to know the Potenza to Viterbo train schedule: the first train leaves at 14:15, while the last ride is at 14:15. A Potenza to Viterbo train cost about 49.2 €. But how long is the train ride from Potenza to Viterbo? Your journey takes about 7 hours on average.