Trieste 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 Trieste Centrale and arrive at Siderno every about 2 hours on average. If travelling with Trenitalia, you need to know the Trieste to Siderno train schedule: the first train leaves at 16:15, while the last ride is at 20:40. A Trieste to Siderno train cost about 218.5 €. But how long is the train ride from Trieste to Siderno? Your journey takes about 18 hours on average.