Portogruaro 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 Portogruaro-Caorle and arrive at Viterbo Porta Fiorentina every about 3 hours on average. If travelling with Trenitalia, you need to know the Portogruaro to Viterbo train schedule: the first train leaves at 11:38, while the last ride is at 16:24. A Portogruaro to Viterbo train cost about 99.0 €. But how long is the train ride from Portogruaro to Viterbo? Your journey takes about 7 hours on average.