Circumvesuviana trains are slow regional trains and are not part of the national Trenitalia network, so they have their own ticketing system. Tickets are inexpensive on this line and don't require advance purchase or reservations.
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In Italy, regional trains can be booked 2 months ahead, while national and international trains may be available 6 months in advance.
ItaliaRail.com is the easiest and best site for booking Italy train tickets. It's cheaper then Trenitalia.com if there are 2 or more passengers. It's an online website that sells Trenitalia tickets in Euros, Pounds, and Dollars.
Reserve Early. The earlier you book your tickets, the more likely you are to get the lowest fare available for the dates you want on the routes along your journey. You may book your travel up to 11 months in advance.
Reserve EarlyThe earlier you book your tickets, the more likely you are to get the lowest fare available for the dates you want on the routes along your journey. You may book your travel up to 11 months in advance.
For the cheapest high-speed tickets in Italy, go for Italo, and buy your tickets in advance. If you're on a super budget, go with the regional trains on Trenitalia. If you've never been to Italy and aren't super great at navigating confusing websites with translations that might be off, book with ItaliaRail.
Trainline lets you choose your exact seats when booking Italian train tickets, while Omio only lets you choose a preference. (Window, middle seat, or solo seat.) They charge the same fee (roughly $2 per seat) that the train companies charge when you book seats with them directly.