Casal di Principe 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 Albanova, Roma Termini, Roma Tiburtina and arrive at Viterbo Porta Fiorentina every 30 minutes on average. If travelling with Trenitalia, you need to know the Casal di Principe to Viterbo train schedule: the first train leaves at 05:11, while the last ride is at 21:46. A Casal di Principe to Viterbo train cost about 5.40 €. But how long is the train ride from Casal di Principe to Viterbo? Your journey takes about 3 hours on average. Trenitalia offers 6 direct trains between these two cities. Booking your train ticket a few weeks in advance though, you can find low cost trains from Casal di Principe to Viterbo with fares starting from 5.40€, saving 30% on average.