Portogruaro to Siderno 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 Portogruaro-Caorle and arrive at Siderno every about 2 hours on average. If travelling with Trenitalia, you need to know the Portogruaro to Siderno train schedule: the first train leaves at 04:13, while the last ride is at 18:24. A Portogruaro to Siderno train cost about 201.8 €. But how long is the train ride from Portogruaro to Siderno? Your journey takes about 14 hours on average.