For "closed-loop" cruises (those beginning and ending at the same U.S. port) in 2026, U.S. citizens can sail with an original state-issued birth certificate and a government-issued photo ID (for those 16 and older). However, Disney Cruise Line strictly mandates that this must be the official original or a certified copy with a raised seal; photocopies or hospital-issued certificates are not accepted. While this is a legal option, Disney and travel experts strongly recommend a valid passport for all guests, including infants. This is because, in the event of an emergency requiring you to fly home from a foreign port (like the Bahamas or Mexico), a birth certificate is insufficient for air travel. If your itinerary involves international air travel or a "one-way" cruise (e.g., departing from Vancouver and ending in Hawaii), a passport is mandatory for all guests.