Can a U.S. citizen fly within Mexico without a passport? No, you must present a valid passport book if you are not Mexican.
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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.
Do I need a passport to travel to Cabo? A U.S. citizens traveling between the U.S. and Mexico by land or sea are required to present a valid passport. For the most current requirements, check the U.S. Customs website at www.cbp.gov or the US Passport Site to ensure you have proper identification.
Can I fly from Tijuana to Tulum without a passport? US citizens of any age flying to or from Mexico must have a US passport book, no exceptions. You should be aware that the US passport card cannot be used for international air travel.
A driver's license, US or Mexican, is not considered official identification in Mexico. If you are a foreigner, you must carry a passport or a Temporary or Permanent Resident Visa. Those are the only acceptable identification cards in Mexico for foreigners. You need a passport to board an international flight.
All foreigners, regardless their nationality, are required to present a valid and not expired passport or travel document when entering Mexico (traveling by air, land or sea). The Mexican government only requires that your passport must be valid during the entirety of your trip.
Additionally, American citizens can visit Mexico by land without a passport granting them access to other sections of the culturally vibrant country, including Mexico City and San Miguel de Allende. However, remember that you will need a passport card if visiting the country by car.
All US citizens traveling by land or sea can enter Mexico and return to the US with a current passport card, but if traveling by air will need a passport.
U.S. citizens under age 16 may present a birth certificate or alternative proof of citizenship when entering by land or sea. All travelers must have a passport book for international air travel.
There will not be any issue for flying from Tijuana to Cancún in the scenario you describe. The airlines request a federal ID such as a passport for the adults and usually they accept birth certificates for the minors.
When traveling in Mexico, the law requires that foreign visitors carry a passport and entry permit. You may be asked to present these documents at any point. If you do not present these documents, immigration authorities may lawfully detain you for up to 60 days while they review your immigration status.