Rieti to Naples 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 Cittaducale and arrive at Roma Tiburtina every about 4 hours on average. If travelling with Trenitalia, you need to know the Rieti to Naples train schedule: the first train leaves at 10:27, while the last ride is at 21:12. A Rieti to Naples train cost about 9.5 €. But how long is the train ride from Rieti to Naples? Your journey takes about 2 hours on average.