Sienna 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 Siena and arrive at Viterbo Porta Fiorentina every about 3 hours on average. If travelling with Trenitalia, you need to know the Sienna to Viterbo train schedule: the first train leaves at 06:00, while the last ride is at 18:02. A Sienna to Viterbo train cost about 13.75 €. But how long is the train ride from Sienna to Viterbo? Your journey takes about 6 hours on average. Thanks to Trenitalia, offers, you can save on your trip from Sienna to Viterbo and find low cost tickets starting from 14 €!