Sulmona 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 Sulmona and arrive at Viterbo Porta Fiorentina every about 2 hours on average. If travelling with Trenitalia, you need to know the Sulmona to Viterbo train schedule: the first train leaves at 05:57, while the last ride is at 17:27. A Sulmona to Viterbo train cost about 16.6 €. But how long is the train ride from Sulmona to Viterbo? Your journey takes about 6 hours on average.