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

Return flights

04 Sep - 19 Sep	Avianca
16 Sep - 25 Sep	Avianca
18 Sep - 23 Sep	Avianca
22 Sep - 24 Sep	Avianca
11 Sep - 15 Sep	Avianca
17 Sep - 26 Sep	Avianca
18 Sep - 26 Sep	Avianca
15 Sep - 27 Sep	Avianca
26 Sep - 29 Sep	Avianca
17 Sep - 24 Sep	Avianca
25 Sep - 06 Oct	Avianca
23 Sep - 02 Oct	Avianca
30 Sep - 21 Oct	Avianca
27 Sep - 01 Oct	Avianca
27 Sep - 02 Oct	Avianca
30 Sep - 08 Oct	Avianca
30 Sep - 15 Oct	Avianca
11 Sep - 31 Oct	Avianca
15 Sep - 15 Oct	Avianca
24 Sep - 08 Oct	Avianca

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 548€

Return flights