A: No. These territories are a part of the United States. U.S. citizens returning directly from a U.S. territory are not considered to have left the U.S. and do not need to present a passport.

From the perspective of a traveler flying from the United States mainland, a trip to St. Croix in the U.S. Virgin Islands (USVI) is considered a domestic flight. Because the USVI is an unincorporated U.S. territory, passengers do not pass through international customs when arriving from the U.S. mainland. However, there is a unique twist: the USVI is a "Free Port" and is outside the standard U.S. customs zone. Therefore, when returning to the U.S. mainland from St. Croix, you must go through a U.S. Customs and Border Protection (CBP) inspection. While a passport is not strictly required for U.S. citizens—a government-issued photo ID and a birth certificate are usually sufficient—it is "gold standard" advice to carry a U.S. Passport to make the clearance process significantly faster. In 2026, many travelers use the CBP Mobile Passport Control (MPC) app at Henry E. Rohlsen Airport to skip the physical lines, but the flight remains legally domestic, meaning you do not need an international data plan for your phone or a visa.