Yes — every U.S. guest needs a valid passport book to fly into Mexico. A passport card, REAL ID, or driver's license is not accepted at the airport, even though a passport card is perfectly fine if a guest is driving across the land border.1,2
What each guest actually needs to fly in
For air travel, U.S. Customs and Border Protection requires a valid passport book for every traveler, including infants and children — there is no exception based on age or short trip length.2 Mexico does not require six months of remaining validity like some countries do; the passport simply needs to be valid for the dates of the trip.1
On top of the passport, every visitor also needs a tourist entry permit called the FMM (Forma Migratoria Múltiple). For stays of 7 days or less it's free; for longer stays it carries a small fee (roughly $57 USD as of 2026), but airlines typically bundle this into the ticket taxes automatically, and land-border travelers pay it separately or fill it out on arrival.3 No visa is required for a normal tourist visit — the passport and FMM are the only documents needed.1,3
| How they're traveling | What's required | What doesn't work |
|---|---|---|
| Flying (all guests) | Valid passport book + FMM | Passport card, REAL ID, driver's license |
| Driving across the land border | Passport book or passport card + FMM | Standard driver's license alone |
| Children & infants | Their own passport book | Being listed on a parent's passport |
The passport card confusion
This is the single most common surprise we see with wedding parties. A U.S. passport card looks official, fits in a wallet, and works for driving into Mexico or Canada — but airlines and Mexican immigration will turn away a guest who shows up at the gate with only a card. If any guest is flying, they need the passport book, not the card.2
Timing — when to tell guests to apply
- Send the passport reminder with the save-the-date — not the formal invitation. By the time formal invites go out, a guest who needs a first-time passport may already be cutting it close.
- Passport processing has run 6-8+ weeks in recent years, longer during the spring/summer renewal rush — guests renewing an expired or soon-to-expire passport should start immediately once they know your date.
- 9-12 months of notice gives every guest, including first-time passport applicants, comfortable runway — this is the same notice window that meaningfully improves overall attendance, covered in our guest attendance data.
What we tell couples: put one line on the save-the-date — "A valid passport book (not a card) is required to fly into Mexico" — and you'll prevent almost every last-minute scramble. It costs nothing and it's the single most useful sentence on the card.
What about guests who are already planning to drive down?
Driving across the land border is the one case where a passport card is genuinely valid, alongside the passport book. It still needs to be a real passport-tier document — a state driver's license or REAL ID is not sufficient to cross into Mexico by any method.2
Sources
- U.S. Department of State, Mexico Travel Advisory & Entry Requirements, 2026.
- U.S. Customs and Border Protection, Document Requirements for Air Travel, 2026.
- Wego Travel Blog, Mexico Tourist Card (FMM) 2026: Requirements, Fees, and How to Apply, 2026.