As of 12:01 am EDT May 12, 2023, noncitizen nonimmigrant air passengers no longer need to show proof of being fully vaccinated with an accepted COVID-19 vaccine to board a flight to the United States. See more information.
Entry into the United States: When traveling by air from Canada, U.S. citizens must present a U.S. passport book or other approved identification document.
A valid passport book is required to enter Mexico by air, and those attempting to enter at an airport with a U.S. passport card only may be denied admission.
At a Glance: Yes, you need a passport to go to Cancun, Mexico from the United States. When traveling by air, a valid passport is required, along with a completed Multiple Migratory Form (FMM).
Some countries don't allow unvaccinated travelers to enter, period. For example, travel to the majority of European countries is possible only to those who are vaccinated. If you're not vaccinated, make sure the country you want to visit will allow you entry.