What the official source says, who checks it, and the cheapest flights out of the country if you need to book one.
Mexico
May be asked for
The official source says you may be asked for one on arrival or at boarding. Checked by border control on arrival.
“At Mexican border control, you may need to: show a return or onward ticket”
Source: UK FCDO · see the source · checked on 12 October 2026
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Onward ticket required · 12
May be asked for · 21
No official rule found · 6
Rules taken from official sources (governments, embassies), with their date. They change: check before you leave, and with your airline.