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

Return flights

03 Dec - 23 Dec	LATAM Airlines Group
02 Dec - 13 Dec	LATAM Airlines Group
01 Dec - 31 Dec	LATAM Airlines Group
02 Dec - 27 Dec	Qatar Airways
10 Dec - 25 Dec	Qatar Airways
08 Dec - 30 Jan	Qatar Airways
02 Dec - 15 Jan	LATAM Airlines Group
26 Dec - 30 Jan	Qatar Airways
25 Dec - 21 Jan	Qatar Airways
27 Dec - 30 Jan	Qantas
01 Dec - 14 Jan	LATAM Airlines Group
24 Dec - 13 Jan	Jetstar
06 Dec - 16 Jan	Qatar Airways
18 Dec - 24 Dec	LATAM Airlines Group
02 Dec - 06 Jan	Qatar Airways
31 Dec - 16 Jan	Qatar Airways
17 Dec - 30 Dec	LATAM Airlines Group
18 Dec - 31 Dec	LATAM Airlines Group
18 Dec - 30 Dec	Qantas
18 Dec - 29 Dec	Qantas

Also check the deals for one-way flights from Sydney to Buenos Aires in December.

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 December from 1866€

Return flights