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

Return flights

25 Sep - 29 Sep	Avianca
25 Sep - 27 Sep	Avianca
19 Sep - 04 Oct	Viva
19 Sep - 07 Oct	Viva
15 Sep - 04 Oct	Viva
20 Sep - 07 Oct	Viva
06 Sep - 20 Sep	Viva
29 Sep - 11 Oct	Viva
19 Sep - 03 Oct	Viva
22 Sep - 11 Oct	Viva
20 Sep - 26 Sep	Viva
29 Sep - 17 Oct	Viva
29 Sep - 04 Oct	Viva
29 Sep - 07 Oct	Viva
19 Sep - 26 Sep	Viva
06 Sep - 13 Sep	Viva
06 Sep - 10 Sep	Viva
06 Sep - 11 Sep	Viva
05 Sep - 20 Sep	Viva
05 Sep - 06 Sep	Volaris	direct

Also check the deals for one-way flights from Mexico City to Miami 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 Mexico City to Miami in September from $136

Return flights