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

Return flights

04 Sep - 22 Sep	LATAM Airlines Group
06 Sep - 11 Sep	LATAM Airlines Group
10 Sep - 17 Sep	LATAM Airlines Group
11 Sep - 26 Sep	LATAM Airlines Group
03 Sep - 26 Sep	LATAM Airlines Group
12 Sep - 26 Sep	LATAM Airlines Group
29 Sep - 09 Oct	LATAM Airlines Group
27 Sep - 08 Oct	LATAM Airlines Group
10 Sep - 14 Oct	LATAM Airlines Group
14 Sep - 06 Oct	LATAM Airlines Group
15 Sep - 07 Oct	LATAM Airlines Group
17 Sep - 25 Sep	Qantas
15 Sep - 22 Sep	Qatar Airways

Also check the deals for one-way flights from Sydney 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 Sydney to Buenos Aires in September from $1527

Return flights