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

Return flights

11 Sep - 17 Oct	LATAM Airlines Group
10 Sep - 17 Oct	LATAM Airlines Group
04 Sep - 11 Sep	Aerolineas Argentinas
30 Sep - 21 Oct	LATAM Airlines Group
27 Sep - 09 Oct	GOL Linhas Aéreas
27 Sep - 01 Oct	GOL Linhas Aéreas
14 Sep - 17 Oct	Sky Airline

Also check the deals for one-way flights from Buenos Aires to Sydney 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 Buenos Aires to Sydney in September from $1792

Return flights