Cruises Sailing from One U.S Port to a Different U.S Port: Guests are required to carry a Passport valid for at least six months beyond the completion of travel, from their country of citizenship AND a valid Permanent Resident Card (Form I-551), that includes a photo I.D.

For most "Closed-Loop" cruises (voyages that begin and end at the same U.S. port) in 2026, you generally do not need two forms of ID if you have a valid Passport. A Passport serves as a "standalone" document for both identity and citizenship. However, if you do not have a passport and are traveling on a closed-loop cruise to the Caribbean, Bahamas, or Mexico, you are legally required to provide two forms of ID: a government-issued photo ID (like a Driver's License) AND an original or certified copy of your Birth Certificate. This is a common requirement under the Western Hemisphere Travel Initiative (WHTI). . It is important to note that even if the cruise line allows a birth certificate, some ports of call (like Martinique or Barbados) may strictly require a passport for entry. Furthermore, if an emergency arises and you need to fly home from a foreign port, you cannot board an international flight without a passport. Therefore, while two forms of ID work for the "loop," a single passport is the only "fail-safe" document recommended for modern cruising.