Direct answer
A wedding invitation does not create a separate route in the US and UK government guidance used here. Guests should check the rule that matches their nationality and route of travel, then make sure the entry period given at the border covers the visit. For U.S. citizens flying in, the State Department says a passport book is required; a passport card cannot be used to board a flight. For British tourists, GOV.UK says no visa is needed, but the passport stamp states the number of days allowed.
Both governments say the final entry decision and permitted stay are matters for Mexican immigration authorities. Do not turn a general tourist maximum, a blog timeline, or a wedding date into permission to stay.
The route changes the check
| Traveller and route | What the current government guidance says | Do not infer |
|---|---|---|
| U.S. citizen flying to Mexico | A passport book is required; a passport card cannot be used to board the flight. | That a document accepted at a land crossing can be used for air travel. |
| U.S. citizen entering by land | Evidence of citizenship is needed; the FMM route and the limited border-zone exception are described separately. | That the six-day, 12-mile exception applies to a destination wedding elsewhere in Mexico. |
| Traveller on a British-citizen passport | No tourist visa is needed in the current GOV.UK guidance; the passport stamp records the days allowed. | That a wedding invitation sets the entry period or replaces documents border control may request. |
If the guest is a U.S. citizen
The US State Department’s Mexico travel guidance says that air travellers need a passport book and that a US passport card cannot be used to board a flight. At international airports, Mexican authorities issue a digital Forma Migratoria Múltiple Digital (FMMD). Immigration officials determine the length of stay when the traveller arrives; the passport is stamped with the entry date, or an e-gate may issue a QR-code receipt.
Passport book required Check the passport book before a guest leaves for the airport.
For land entry, the same guidance says travellers need evidence of citizenship, such as a passport book or card, and that travellers must apply for an FMM entry permit online or at an INM office. Its limited border-zone exception is specific: a stay of six days or less within 12 miles (20 kilometres) of the US border does not need an FMM. It is not a rule for a destination wedding elsewhere in Mexico.
Air and land are different checks. A US passport card may be relevant at a land crossing, but it cannot board a flight to Mexico. Plan the document check around the actual route each guest will use.
If the guest is travelling on a British-citizen passport
GOV.UK says a passport must be valid for the duration of the stay. It reports that the Mexican Embassy in the UK recommends at least 180 days of validity because that is the longest tourist stay; this is a recommendation, not wording to substitute for the actual entry period granted at the border.
British tourists do not need a visa according to the current GOV.UK entry page. The passport stamp gives the number of days allowed. British nationals entering by land must complete an online immigration form. GOV.UK also says border control may ask for a return or onward ticket, accommodation evidence, and proof of sufficient funds, so guests should keep those documents accessible rather than relying on an invitation alone.
Days set on arrival The days actually granted on arrival are the days to plan around.
Before a guest travels
- Open the US State Department Mexico guidance or GOV.UK Mexico entry requirements close to departure.
- Check the route: air, land, or a transit country can have different rules.
- Check passport validity against the traveller’s own government guidance and any transit-country requirement.
- Keep the entry record and verify the number of days actually granted on arrival.
- This visitor guide does not cover work or immigration status.
For the legal marriage route, see why a Mexico civil marriage must start with the Registry. For the country overview, see planning a wedding in Mexico. A guest-entry check does not establish how the couple’s later marriage record will be treated; see Mexican marriage records in US and UK processes. You can also start a private planning checklist.
Sources and review
Reviewed 18 August 2026 by the Plan a Wedding Editorial Team. Sources: US State Department Mexico travel guidance and GOV.UK Mexico entry requirements. Entry requirements change; every guest should recheck the source matching their own nationality and travel route before departure. Read our editorial policy or use our contact page to report a correction.