Sulmona 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 Sulmona and arrive at Siderno every about 2 hours on average. If travelling with Trenitalia, you need to know the Sulmona to Siderno train schedule: the first train leaves at 07:24, while the last ride is at 18:01. A Sulmona to Siderno train cost about 78.8 €. But how long is the train ride from Sulmona to Siderno? Your journey takes about 15 hours on average.