AirHint found the following cheapest return flights from Los Angeles (LAX) to Sydney (SYD) in December 2025 (see full year).

Return flights

07 Dec - 21 Dec	United	direct
03 Dec - 19 Dec	United	direct
31 Dec - 17 Jan	United
06 Dec - 20 Dec	LATAM Airlines Group
13 Dec - 27 Dec	LATAM Airlines Group
23 Dec - 21 Jan	Alaska Airlines
10 Dec - 29 Dec	Fiji Airways
29 Dec - 09 Jan	Fiji Airways
23 Dec - 07 Jan	Fiji Airways
28 Dec - 10 Jan	Fiji Airways
27 Dec - 31 Dec	Fiji Airways
27 Dec - 29 Jan	Fiji Airways
26 Dec - 10 Jan	Fiji Airways
25 Dec - 07 Jan	Fiji Airways
26 Dec - 07 Jan	Fiji Airways
23 Dec - 11 Jan	Fiji Airways
10 Dec - 29 Dec	American Airlines	direct
10 Dec - 14 Dec	United
11 Dec - 18 Dec	United
04 Dec - 15 Dec	Delta	direct

Also check the deals for one-way flights from Los Angeles to Sydney 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 Los Angeles to Sydney in December from $852

Return flights