Acerra 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 Acerra and arrive at Viterbo Porta Fiorentina every about 4 hours on average. If travelling with Trenitalia, you need to know the Acerra to Viterbo train schedule: the first train leaves at 04:38, while the last ride is at 14:52. A Acerra to Viterbo train cost about 19.6 €. But how long is the train ride from Acerra to Viterbo? Your journey takes about 6 hours on average.