Most people travelling to Sorrento from Rome will take the train (Trenitalia from Termini Station or ITALO Treno from Tiburtina Station) to Napoli Centrale, then the unreserved Circumvesuviana commuter train to Sorrento. The reserved train takes between 70 minutes and two hours (depending on whether a Frecciarossa or an Intercity), and the Circumvesuviana another 65 minutes or so. That makes travel time (exclusive of the connection in Naples) anywhere between two and three hours. Circumvesuviana trains depart every 30 minutes on average.
This is the "conventional" solution for travel from Rome to Sorrento.
But there is a way to get to Sorrento without a single connection!
This solution is particularly useful for people with mobility problems, those who may have difficulty lifting luggage on and off trains, or those who simply prefer to avoid the Circumvesuviana train, which is known to get quite crowded during commute times.
The solution is to take the DIRECT Marozzi bus from Rome's Tiburtina bus depot all the way to Sorrento (Circumvesuviana station). The Tiburtina bus depot is located 300 meters from Rome's Tiburtina train/metro station, which is conveniently connected every 15 minutes by Trenitalia unreserved airport train to FCO Airport. It takes about five minutes to walk from the train/metro station entrance to the bus depot.
There is a year-round Marozzi bus at 15:00, arriving in Sorrento at 19:00. The bus operates Monday through Saturday, but NOT on Sunday. The mid-afternoon departure makes for an easy connection from many incoming flights to both Fiumicino (FCO) and Ciampino (CIA) airports.
From June 1 through September 30, there is a SECOND bus departure DAILY at 7:00 a.m., arriving in Sorrento at 10:45. (This bus continues on to Positano, Praiano and Amalfi).
The one-way fare is 18 Euros. Advance reservations are optional but not mandatory.
1. Direct service. No need to haul luggage between trains at Napoli Centrale. No need to lift luggage on and off trains. Stow luggage in the underfloor baggage compartment of the bus.
2. Cheap: only 18 Euros, versus 23 (Intercity), 36 (Eurostar Italia) or 43 (Frecciarossa) Euros on the Trenitalia train to Napoli Centrale, plus 4 Euros on the Circumvesuviana train to Sorrento. (There is also the unreserved Trenitalia "regionale" train from Rome to Naples for only 11.20 Euros, but it takes over 2.5 hours. There are also cheaper discounted fares on both Trenitalia and ITALO TRENO reserved trains which have significant restrictions).
3. Unless you take the fast and expensive high-speed train (Frecciarossa or ITALO TRENO), the direct bus is not so slow, considering that the train solution (using the Trenitalia Intercity train) will take over three hours.
4. Guaranteed seating all the way to Sorrento. By contrast, the unreserved Circumvesuviana commuter train sometimes has lots of standing passengers.
5. No problem with luggage. By contrast, you must keep luggage by your seat (or next to your legs) on the Circumvesuviana train.
1. Slow: 4 hours, versus 2-3 hours by train (NOT counting connection time in Naples).
2. May be subject to traffic delays.
3. No service on Sundays (except from June through September at 7:00 a.m.).
4. Limited schedules: only one bus year-round, and two buses from June through September.
5. Limited connection timeframes from FCO and CIA airports.
From Sorrento at 6:00 a.m., arriving Rome Tiburtina bus depot 9:45 (year-round, daily except Sunday).
Additionally, from Sorrento at 17:00, arriving Rome at 21:00 (daily, from June through September only).
NOTE: Competitor bus operator Curreri is not running buses on this route at this time.
OPINION: Don't discard the Marozzi bus solution out of hand. It has somewhat limited appeal, but is nonetheless a very welcome option.