All U.S. citizens are required to present a valid U.S. passport to re-enter the United States via air. For re-entry into the U.S. via land and sea borders, U.S. citizens must present either a U.S. passport, passport card, NEXUS card, Enhanced Driver's License or other Western Hemisphere Travel initiative-compliant document.
Persons visiting from countries other than the United States must have a valid passport and may require other documentation such as travel visas. Check with the nearest Canadian Consulate well in advance of travel. This information applies to persons entering Canada temporarily as visitors. Other regulations apply if an extended stay, work or certain types of business activity are contemplated.
For more information, consult the Canada Customs website at www.cra-arc.gc.ca/visitors or call toll-free within Canada 1-888-502-9060.