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

Return flights

25 Sep - 02 Oct	LATAM Airlines Group
17 Sep - 01 Oct	LATAM Airlines Group
22 Sep - 22 Oct	LATAM Airlines Group
30 Sep - 17 Oct	Avianca
26 Sep - 10 Oct	Avianca
26 Sep - 09 Oct	Avianca
26 Sep - 29 Sep	Avianca
26 Sep - 30 Sep	Avianca
30 Sep - 08 Oct	Avianca
12 Sep - 19 Sep	Arajet
12 Sep - 22 Sep	Arajet
12 Sep - 20 Sep	Arajet
03 Sep - 05 Sep	Arajet
03 Sep - 10 Sep	Arajet
10 Sep - 23 Sep	Avianca
11 Sep - 22 Sep	Avianca
11 Sep - 23 Sep	Avianca
02 Sep - 02 Oct	Avianca
02 Sep - 07 Oct	Avianca
08 Sep - 02 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 533€

Return flights