Frosinone to Trieste 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 Frosinone and arrive at Trieste Centrale every 60 minutes on average. If travelling with Trenitalia, you need to know the Frosinone to Trieste train schedule: the first train leaves at 05:00, while the last ride is at 17:10. A Frosinone to Trieste train cost about 68.5 €. But how long is the train ride from Frosinone to Trieste? Your journey takes about 8 hours on average. Thanks to Trenitalia, offers, you can save on your trip from Frosinone to Trieste and find low cost tickets starting from 36 €!