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

Return flights

04 Sep - 18 Sep	LATAM Airlines Group
04 Sep - 19 Sep	LATAM Airlines Group
28 Sep - 18 Oct	LATAM Airlines Group
05 Sep - 30 Sep	LATAM Airlines Group
27 Sep - 09 Oct	LATAM Airlines Group
22 Sep - 22 Oct	LATAM Airlines Group
05 Sep - 03 Oct	Qantas
28 Sep - 16 Oct	LATAM Airlines Group
27 Sep - 03 Oct	LATAM Airlines Group
26 Sep - 08 Oct	LATAM Airlines Group
11 Sep - 08 Oct	LATAM Airlines Group
29 Sep - 15 Oct	LATAM Airlines Group
18 Sep - 25 Sep	Qantas
22 Sep - 14 Oct	LATAM Airlines Group
05 Sep - 09 Sep	Jetstar
15 Sep - 30 Sep	LATAM Airlines Group
23 Sep - 30 Sep	Qantas
16 Sep - 23 Sep	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 1316€

Return flights