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

Return flights

12 Dec - 25 Dec	Fiji Airways
03 Dec - 19 Dec	Fiji Airways
09 Dec - 27 Dec	Fiji Airways
08 Dec - 16 Dec	Fiji Airways
08 Dec - 15 Dec	Fiji Airways
10 Dec - 31 Dec	Fiji Airways
10 Dec - 27 Dec	Fiji Airways
06 Dec - 09 Dec	Fiji Airways
27 Dec - 07 Jan	Fiji Airways
28 Dec - 11 Jan	Fiji Airways
28 Dec - 07 Jan	Fiji Airways
12 Dec - 11 Jan	Fiji Airways
28 Dec - 29 Jan	Fiji Airways
29 Dec - 13 Jan	Fiji Airways
27 Dec - 24 Jan	Fiji Airways
27 Dec - 10 Jan	Fiji Airways
29 Dec - 08 Jan	Fiji Airways
02 Dec - 20 Dec	Air New Zealand
01 Dec - 24 Jan	Fiji Airways
06 Dec - 20 Dec	Air New Zealand

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 $897

Return flights