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

Return flights

03 Dec - 09 Dec	Fiji Airways
08 Dec - 19 Jan	Fiji Airways
05 Dec - 17 Jan	Fiji Airways
07 Dec - 19 Jan	Fiji Airways
11 Dec - 18 Dec	Qantas
02 Dec - 09 Dec	Qantas
01 Dec - 11 Dec	Qantas
01 Dec - 10 Dec	Qantas
31 Dec - 19 Jan	Qantas
29 Dec - 13 Jan	Qantas
29 Dec - 19 Jan	Qantas
11 Dec - 17 Jan	Qantas
08 Dec - 16 Dec	Air Canada
01 Dec - 16 Dec	Air Canada
09 Dec - 16 Dec	Air Canada
30 Dec - 20 Jan	Air Canada
29 Dec - 12 Jan	Qantas
02 Dec - 10 Dec	Qantas
02 Dec - 13 Dec	Air Canada
29 Dec - 15 Jan	Air Canada

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 $709

Return flights