Formia 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 Formia-Gaeta and arrive at Viterbo Porta Fiorentina every about 2 hours on average. If travelling with Trenitalia, you need to know the Formia to Viterbo train schedule: the first train leaves at 06:38, while the last ride is at 20:02. A Formia to Viterbo train cost about 12.3 €. But how long is the train ride from Formia to Viterbo? Your journey takes about 4 hours on average. Thanks to Trenitalia, offers, you can save on your trip from Formia to Viterbo and find low cost tickets starting from 12 €!