You must have a passport which is valid for at least three months longer than the date you plan to leave Norway. You must normally have NOK 500 available for each day of your stay in Norway.
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To that end, Norwegian strongly recommends all guests to obtain a passport for their voyage on any Norwegian vessel. All guests must carry a valid passport, and if necessary, a multiple entry visa is required for entry into the United States (i.e. B-2 Visitors Visa), or a visa waiver.
In place of a passport, you can use WHTI-compliant documents like passport cards, trusted traveler's cards, and NEXUS cards. While these allow you to travel to these regions by sea and road, they are not acceptable for international flights.
All U.S. citizens need U.S. passport books if re-entering by air. Land and sea border crossings accept additional travel documents, such as U.S. Passport cards and Trusted Traveler cards. Child travelers have additional options - see the Traveling with Children section.
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