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

Return flights

22 Sep - 27 Sep	Viva
22 Sep - 01 Oct	Viva
22 Sep - 02 Oct	Viva
12 Sep - 24 Sep	Arajet
30 Sep - 08 Oct	Arajet
28 Sep - 05 Oct	Arajet
15 Sep - 28 Sep	Aeromexico
15 Sep - 01 Oct	Volaris
23 Sep - 27 Sep	Viva
15 Sep - 27 Sep	Aeromexico
16 Sep - 24 Sep	Arajet
24 Sep - 05 Oct	Arajet
25 Sep - 05 Oct	Arajet
10 Sep - 25 Sep	Arajet
10 Sep - 29 Sep	Arajet
15 Sep - 05 Oct	Volaris
23 Sep - 30 Sep	Viva
18 Sep - 24 Sep	Arajet
28 Sep - 03 Oct	Arajet
23 Sep - 04 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 579€

Return flights