Prato 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 Prato Porta al Serraglio and arrive at Trieste Centrale every 60 minutes on average. If travelling with Trenitalia, you need to know the Prato to Trieste train schedule: the first train leaves at 07:44, while the last ride is at 19:39. A Prato to Trieste train cost about 41.5 €. But how long is the train ride from Prato to Trieste? Your journey takes about 5 hours on average.