If you are on a closed-loop cruise that begins and ends at the same port in the United States and visits Canada, Mexico, or much of the Caribbean, you do not need a valid passport. According to CBP, all you need is documentation proving you are a U.S. citizen.

Yes, you must still go through a customs and immigration check at the end of a closed-loop cruise, but the process is generally much simpler for U.S. citizens. A closed-loop cruise is one that starts and ends at the same U.S. port (e.g., Miami to the Bahamas and back to Miami). Upon your return to the U.S., you will pass through a Customs and Border Protection (CBP) checkpoint. In 2026, many major ports utilize facial recognition technology to speed this up, often allowing you to walk through without even showing a passport if you have one on file. While you may not need a passport to board a closed-loop cruise (a birth certificate and government ID are often sufficient for U.S. citizens), you are still legally required to declare any goods purchased abroad that exceed your duty-free allowance. CBP officers reserve the right to inspect your luggage and verify your citizenship before you are allowed to exit the terminal and head home.