Prato 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 Prato Porta al Serraglio and arrive at Viterbo Porta Fiorentina every about 2 hours on average. If travelling with Trenitalia, you need to know the Prato to Viterbo train schedule: the first train leaves at 05:30, while the last ride is at 18:23. A Prato to Viterbo train cost about 18.35 €. But how long is the train ride from Prato to Viterbo? Your journey takes about 5 hours on average.