AirHint found the following cheapest return flights from Cancun (CUN) to Buenos Aires (AEP) in September 2025 (see full year).

Return flights

08 Sep - 24 Sep	Avianca
09 Sep - 24 Sep	Avianca
09 Sep - 23 Sep	Avianca
01 Sep - 08 Sep	Avianca
06 Sep - 29 Sep	Avianca
15 Sep - 15 Oct	Avianca
18 Sep - 27 Sep	Avianca
29 Sep - 22 Oct	Avianca
13 Sep - 21 Sep	Avianca
15 Sep - 22 Sep	Avianca
06 Sep - 17 Sep	Avianca
19 Sep - 01 Oct	Avianca
07 Sep - 22 Sep	Avianca
29 Sep - 20 Oct	Avianca
28 Sep - 21 Oct	Avianca
28 Sep - 04 Oct	LATAM Airlines Group
29 Sep - 05 Oct	LATAM Airlines Group
18 Sep - 04 Oct	Avianca

Also check the deals for one-way flights from Cancun 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 Cancun to Buenos Aires in September from 483€

Return flights