AirHint found the following cheapest return flights from Mexico City (MEX) to Buenos Aires (AEP) in September 2026 (see full year).

Return flights

01 Sep - 22 Sep	GOL Linhas Aéreas
03 Sep - 16 Sep	Avianca
01 Sep - 09 Sep	Volaris
12 Sep - 22 Sep	Avianca
14 Sep - 28 Sep	Avianca
11 Sep - 20 Sep	Avianca
01 Sep - 08 Sep	Volaris
07 Sep - 21 Sep	Volaris
07 Sep - 14 Sep	Volaris
16 Sep - 29 Sep	Volaris
23 Sep - 09 Oct	Avianca
24 Sep - 09 Oct	Avianca
26 Sep - 05 Oct	Avianca
30 Sep - 07 Oct	Avianca
23 Sep - 10 Oct	Viva
24 Sep - 10 Oct	Viva
23 Sep - 14 Oct	Viva
24 Sep - 14 Oct	Viva
20 Sep - 10 Oct	Viva
24 Sep - 15 Oct	Viva

Also check the deals for one-way flights from Mexico City to Buenos Aires 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 Buenos Aires in September from $737

Return flights