The entrance fee for Ostia Antica is €18 for adults and €2 for EU citizens between the ages of 18 and 25. Admission is free for children under 18, as well as on the first Sunday of each month for all visitors. Additional fees may apply for online reservations, typically around €2. Audioguides can be rented onsite for €5–€7, depending on the option. No reservation is needed for free entry on the first Sunday, but lines may be longer than usual[1][3][5].
Tickets grant access to all areas of the archaeological park. Reduced and free tickets can be collected at the box office with appropriate ID. You can purchase tickets online or at the ticket office on site; due to the large area, advance booking is not essential[1][3].