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

Return flights

01 Dec - 15 Dec	Air New Zealand
01 Dec - 24 Jan	Air New Zealand
03 Dec - 17 Dec	Air New Zealand
04 Dec - 14 Dec	Air New Zealand
08 Dec - 25 Dec	Air Canada
04 Dec - 11 Dec	Fiji Airways
04 Dec - 25 Dec	Air Canada
04 Dec - 21 Dec	Air Canada
16 Dec - 25 Dec	Air Canada
04 Dec - 10 Dec	Fiji Airways
07 Dec - 12 Dec	Air Canada
15 Dec - 15 Jan	Air Canada
25 Dec - 13 Jan	Fiji Airways
31 Dec - 12 Jan	Fiji Airways
27 Dec - 29 Jan	Fiji Airways
23 Dec - 20 Jan	Air New Zealand
26 Dec - 21 Jan	Air New Zealand
30 Dec - 22 Jan	Air Canada
26 Dec - 20 Jan	Air Canada
01 Dec - 24 Jan	Qantas	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 $830

Return flights