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

Return flights

09 Sep - 16 Sep	Qantas
11 Sep - 14 Sep	LATAM Airlines Group
05 Sep - 16 Sep	LATAM Airlines Group
05 Sep - 07 Sep	LATAM Airlines Group
05 Sep - 23 Sep	LATAM Airlines Group
06 Sep - 12 Sep	Qantas
19 Sep - 03 Oct	LATAM Airlines Group
02 Sep - 09 Sep	Qantas
01 Sep - 25 Sep	LATAM Airlines Group
08 Sep - 15 Sep	LATAM Airlines Group
06 Sep - 13 Sep	Qantas
26 Sep - 08 Oct	LATAM Airlines Group
08 Sep - 17 Oct	LATAM Airlines Group
23 Sep - 22 Oct	Qantas
29 Sep - 14 Oct	LATAM Airlines Group
10 Sep - 14 Oct	LATAM Airlines Group
03 Sep - 14 Oct	LATAM Airlines Group
16 Sep - 26 Oct	Qatar Airways
12 Sep - 09 Oct	Qantas
12 Sep - 12 Oct	LATAM Airlines Group

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 1436€

Return flights