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

Return flights

11 Sep - 17 Sep	Arajet
12 Sep - 21 Sep	Arajet
18 Sep - 28 Sep	Arajet
07 Sep - 14 Sep	Arajet
07 Sep - 21 Sep	Arajet
03 Sep - 17 Sep	Arajet
14 Sep - 28 Sep	Arajet
02 Sep - 17 Sep	Arajet
13 Sep - 21 Sep	Arajet
01 Sep - 14 Sep	Viva
28 Sep - 05 Oct	Arajet
24 Sep - 01 Oct	Arajet
25 Sep - 12 Oct	Avianca
22 Sep - 04 Oct	LATAM Airlines Group
19 Sep - 07 Oct	LATAM Airlines Group
25 Sep - 09 Oct	LATAM Airlines Group
07 Sep - 08 Oct	LATAM Airlines Group
08 Sep - 09 Oct	LATAM Airlines Group
27 Sep - 07 Oct	LATAM Airlines Group
25 Sep - 06 Oct	LATAM Airlines Group

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 377€

Return flights