Passports and visa: U.S. citizens must have a valid U.S. passport to enter Saint Kitts and Nevis. No visa is required for stays up to 90 days if you have an onward or return ticket, confirmation of accommodation, and can produce evidence of your ability to maintain yourself.

Yes, in 2026, all U.S. citizens arriving in Saint Kitts and Nevis by air must present a valid U.S. passport with at least six months of remaining validity. Additionally, as of late 2025, travelers must complete an Electronic Travel Authorization (eTA) before arrival, which carries a small processing fee. While travelers on "closed-loop" cruises (starting and ending at the same U.S. port) may technically use a birth certificate and government photo ID under WHTI rules, the U.S. State Department strongly recommends a passport in case of emergencies, such as a medical evacuation or a ship malfunction that requires flying home. It is a peer-to-peer "traveler's must" to ensure you also have proof of an onward or return ticket and sufficient funds to cover your stay to clear Kittian customs smoothly.