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

Return flights

30 Sep - 11 Oct	Sky Airline
25 Sep - 16 Oct	Sky Airline
25 Sep - 28 Sep	Sky Airline
19 Sep - 27 Sep	Sky Airline
29 Sep - 02 Oct	LATAM Airlines Group
24 Sep - 02 Oct	Sky Airline
19 Sep - 20 Sep	Sky Airline
25 Sep - 31 Oct	Avianca
24 Sep - 05 Oct	Sky Airline
23 Sep - 29 Sep	Avianca
23 Sep - 01 Oct	Avianca
23 Sep - 04 Oct	Arajet
29 Sep - 06 Oct	LATAM Airlines Group
23 Sep - 25 Sep	Arajet
26 Sep - 29 Sep	Copa
17 Sep - 03 Oct	LATAM Airlines Group
22 Sep - 30 Sep	Avianca
21 Sep - 28 Sep	Aeromexico
18 Sep - 30 Sep	Sky Airline
17 Sep - 29 Sep	LATAM Airlines Group

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