In 2026, whether you need a REAL ID for a Carnival cruise depends on your itinerary and your citizenship. For "Closed-Loop" cruises (those that start and end at the same U.S. port, like Miami to the Bahamas and back), U.S. citizens do not strictly need a REAL ID; they can still use a standard State-Issued Birth Certificate along with a government-issued photo ID. However, the TSA now requires a REAL ID or a Passport for all domestic flights, so if you are flying to your cruise port, you will need a REAL ID-compliant license to board your plane. For all other international cruises, a valid U.S. Passport is the "gold standard" and is highly recommended by Carnival to avoid issues if you are unexpectedly stranded in a foreign country and need to fly home. It is a high-value peer tip to just use a Passport; it serves as a REAL ID for your flight and ensures you have zero documentation issues at the cruise terminal, making your embarkation day significantly smoother.