Ostuni 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 Ostuni and arrive at Siderno every about 6 hours on average. If travelling with Trenitalia, you need to know the Ostuni to Siderno train schedule: the first train leaves at 06:18, while the last ride is at 06:57. A Ostuni to Siderno train cost about 26.7 €. But how long is the train ride from Ostuni to Siderno? Your journey takes about 9 hours on average.