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Mexico passport rules: the 6-month myth and the passport card

Mexico is one of the easiest countries for passport validity, but the US passport card catches people out. Here is what Mexico and the US and UK governments actually say.

Quick answer

Mexico has no 6-month passport rule: Mexico's foreign ministry says your passport needs no minimum validity, such as 6 months, but must be valid for your whole stay. A US passport card can be used at land crossings and on cruises, but by land only within the border zone, and never for flights. Everyone also needs an FMM entry permit.

Do you need 6 months on your passport for Mexico?

No. Mexico's foreign ministry (SRE) says a passport doesn't need a minimum validity, giving 6 months as an example, but it must be valid for the whole time you stay. The UK Foreign Office says the same for British passports. One extra point for UK travellers: FCDO notes that the Mexican Embassy in the UK recommends at least 180 days of validity, because 180 days is the longest you can stay as a tourist. Our passport validity checker shows that as a warning, not a fail.

Can you use a US passport card to go to Mexico?

  • By air: no. The State Department says you need a passport book to fly to Mexico and can't use a passport card to board a plane.
  • By land: only for the border zone. Mexico's immigration institute (INM) says the passport card can be used at land border crossings and to visit the border strip only. It can't be used to travel into the interior of Mexico or for international flights.
  • By sea: yes. For travel to Mexico by sea, the State Department lists a valid passport, a US passport card, a trusted traveler card (NEXUS, SENTRI or FAST) or a state-issued REAL ID.

Coming home, US Customs and Border Protection accepts the passport card for re-entering the US at land and sea ports from Mexico. Passport cards are not valid for international travel by air, so take your passport book too if there's any chance you'll fly back.

What is the FMM and do you need one?

The Forma Migratoria Múltiple (FMM) is Mexico's entry permit. The State Department says all travelers must get one, online or from an INM office, including people only going within 12 miles (20 km) of the border. INM says an FMM is valid for up to 180 calendar days and for one entry. Keep track of your days with the rolling days calculator.

Do you need blank pages?

The State Department says air travelers need 1 blank page per stamp. It doesn't list a blank-page requirement for land travel.

Quick summary

US passportUK passport
ValidityValid for your whole stayValid for your whole stay (180 days recommended)
Passport cardLand (border zone only) and sea; never airNot applicable
Entry permitFMMFMM

Last verified 2026-10-28.

Frequently asked questions

Does Mexico have a 6-month passport rule?
No. Your passport must be valid for your whole stay in Mexico. The Mexican Embassy in the UK recommends 180 days for British travellers, but that is a recommendation, not the rule.
Can I fly to Mexico with a passport card?
No. The State Department says you need a passport book to fly to Mexico, and you can't use a passport card to board a plane.
Can I drive into Mexico with a passport card?
Yes, but Mexico's immigration institute says the passport card only covers land border crossings and the border strip. To travel further into Mexico, take your passport book.
Can I go on a cruise to Mexico with a passport card?
Yes. For travel to Mexico by sea, the State Department lists the US passport card as an accepted document. Take your passport book too if you might need to fly home.

Official sources