AirHint found the following cheapest return flights from Miami (MIA) to Mexico City (MEX) in September 2025 (see full year).

Return flights

17 Sep - 21 Sep	Avianca
19 Sep - 21 Sep	Avianca
06 Sep - 19 Sep	Viva
20 Sep - 06 Oct	Viva
13 Sep - 19 Sep	Viva
26 Sep - 29 Sep	Viva
06 Sep - 15 Sep	Viva
20 Sep - 11 Oct	Viva
06 Sep - 22 Sep	Viva
19 Sep - 26 Sep	Volaris
24 Sep - 26 Sep	Volaris
08 Sep - 19 Sep	Volaris
26 Sep - 06 Oct	Viva
26 Sep - 13 Oct	Viva
23 Sep - 06 Oct	Viva
23 Sep - 13 Oct	Viva
29 Sep - 01 Oct	Volaris	direct
26 Sep - 11 Oct	Viva
23 Sep - 11 Oct	Viva
30 Sep - 06 Oct	Viva

Also check the deals for one-way flights from Miami to Mexico City in September.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Miami to Mexico City in September from $131

Return flights