In 2026, the ability to switch a park reservation at Disney World or Disneyland depends on availability and the specific type of ticket you hold. Disney has significantly relaxed its "Park Pass" reservation requirements for most standard date-based tickets, but they are still mandatory for Annual Passholders and certain "Magic Key" holders. If you need to switch, you must first check the Availability Calendar on the official Disney website or app. If the park you want to switch to has "green" availability, you can usually "Modify" your existing reservation in the "My Plans" section of the app. It is important not to cancel your original reservation until you are certain the new one is available, as you could end up with no reservation at all if the system is busy. For 2026, many "date-based" tickets no longer require a reservation at all, but for those that do, switching is a simple digital process—provided the park hasn't reached its capacity for the day, which frequently happens during peak holidays like Spring Break or Christmas.