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

Return flights

15 Sep - 13 Oct	Avianca
15 Sep - 20 Oct	Avianca
16 Sep - 10 Oct	Avianca
15 Sep - 15 Oct	Avianca
11 Sep - 25 Sep	Avianca
15 Sep - 25 Sep	Avianca
15 Sep - 28 Sep	Avianca
09 Sep - 16 Sep	Avianca
08 Sep - 18 Sep	Avianca
15 Sep - 21 Sep	Avianca
01 Sep - 21 Sep	Avianca
08 Sep - 21 Sep	Avianca
12 Sep - 27 Sep	Avianca
13 Sep - 26 Sep	Avianca
23 Sep - 14 Oct	Avianca
24 Sep - 23 Oct	Avianca
25 Sep - 09 Oct	Avianca
04 Sep - 01 Oct	LATAM Airlines Group
29 Sep - 30 Oct	Avianca
30 Sep - 18 Oct	Avianca

Also check the deals for one-way flights from Paris 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 Paris to Buenos Aires in September from 802€

Return flights