Osimo 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 Osimo-Castelfidardo and arrive at Viterbo Porta Fiorentina every about 2 hours on average. If travelling with Trenitalia, you need to know the Osimo to Viterbo train schedule: the first train leaves at 05:49, while the last ride is at 17:32. A Osimo to Viterbo train cost about 16.0 €. But how long is the train ride from Osimo to Viterbo? Your journey takes about 6 hours on average.