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

Return flights

07 Dec - 23 Dec	China Eastern
03 Dec - 21 Jan	United
08 Dec - 13 Jan	American Airlines
09 Dec - 12 Dec	United
14 Dec - 30 Jan	United
11 Dec - 20 Jan	United
14 Dec - 29 Jan	United
03 Dec - 16 Dec	United
04 Dec - 16 Dec	United
29 Dec - 23 Jan	United
27 Dec - 20 Jan	Qantas
04 Dec - 11 Dec	LATAM Airlines Group
03 Dec - 10 Dec	LATAM Airlines Group
23 Dec - 30 Dec	Jetstar
04 Dec - 31 Dec	LATAM Airlines Group
10 Dec - 31 Dec	LATAM Airlines Group
30 Dec - 07 Jan	Qantas
10 Dec - 18 Jan	United
10 Dec - 15 Jan	United
01 Dec - 06 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 1445€

Return flights