Sienna 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 Siena and arrive at Siderno every about 6 hours on average. If travelling with Trenitalia, you need to know the Sienna to Siderno train schedule: the first train leaves at 18:18, while the last ride is at 18:43. A Sienna to Siderno train cost about 129.8 €. But how long is the train ride from Sienna to Siderno? Your journey takes about 14 hours on average.