Most visitors from the United Kingdom, regardless of vaccination status, can enter Mexico.
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All citizens of the United States must present a valid passport when entering Mexican territory by any means of transportation. There are no exceptions for minors.
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.
Visitors to Cancun should limit their travel to tourist areas. This comprises the hotel zone in Cancun, gated resort communities, specific commercial areas, and other tourist destinations. Certain communities that are infamous for crime are the ones you do want to stay away from.
Specifically, products that contain stimulants (medicines that contain pseudoephedrine, such as Actifed, Sudafed, and Vicks inhalers) or codeine are prohibited.
The Visa Waiver Program (VWP) enables most citizens or nationals of participating countries* to travel to the United States for tourism or business for stays of 90 days or less without obtaining a visa.
The rules require most U.S. citizens entering the United States from Mexico at sea or land ports of entry to have a passport, passport card, or other travel document approved by the Department of Homeland Security.
Mexican immigration authorities could ask you to present both your passport and entry permit if applicable at any point and may detain you while they review your immigration status if you are not carrying your passport and proof of legal status in Mexico, or if you have overstayed your authorized stay.
Tourists and business travelers from the United States can stay up to 180 days visa-free in Mexico. Americans can also transit in Mexico for up to 30 days without a visa. The same is true for non-US nationals who hold a valid US visa or Green Card.
Medication is usually screened by X-ray; however, if a passenger does not want a medication X-rayed, he or she may ask for a visual inspection instead. This request must be made before any items are sent through the X-ray tunnel.