Whether you need "two tickets" depends on whether you want to visit both parks on the same day. Universal Orlando offers two main ticket types: the "Base Ticket" and the "Park-to-Park Ticket." A Base Ticket allows you to visit either Universal Studios Florida or Islands of Adventure for the day, but you cannot switch between them. To visit both in one day—and most importantly, to ride the Hogwarts Express train which connects the two—you must have a Park-to-Park Ticket. In 2026, with the opening of the new Epic Universe park, Universal has transitioned to multi-day tickets that often include access to all three (or four, including Volcano Bay) parks. If you only have a 1-day ticket, you must choose between one park (Base) or both (Park-to-Park). For the full experience, especially for Harry Potter fans, the Park-to-Park option is essential as the train ride provides a unique "inter-park" story that is different in each direction.