Tiemme Spa operates a bus from Siena to Rapolano Terme hourly. Tickets cost $3 - $6 and the journey takes 30 min. Trenitalia also services this route 6 times a week. Alternatively, Trenitalia operates a train from Siena to Rapolano Terme every 3 hours. Tickets cost $3 - $9 and the journey takes 36 min.