Circumvesuviana train service is running from Naples main station to Sorrento every 30 minutes from 6,00 am to 09,30 pm, train ride is 110 minutes about.
The Circumvesuviana train station is under level to the Trenitalia train station in Naples
Tickets available in the station, € 4,00 from Naples to Sorrento.
Timetable available on web: http://www.eavsrl.it/web/content/orario-ferrovia
Information call center 800211388