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

Return flights

01 Dec - 08 Dec	United
03 Dec - 22 Dec	United	direct
03 Dec - 21 Dec	United	direct
05 Dec - 16 Dec	United	direct
03 Dec - 20 Dec	United	direct
04 Dec - 21 Dec	United	direct
01 Dec - 19 Dec	United	direct
01 Dec - 08 Dec	Delta	direct
01 Dec - 06 Dec	Delta	direct
29 Dec - 15 Jan	Air Canada
29 Dec - 09 Jan	Fiji Airways
15 Dec - 08 Jan	Fiji Airways
07 Dec - 21 Dec	Air Canada
16 Dec - 13 Jan	Air Canada
31 Dec - 18 Jan	Delta	direct
26 Dec - 12 Jan	Air Canada
28 Dec - 10 Jan	United	direct
26 Dec - 12 Jan	United	direct
23 Dec - 12 Jan	Alaska Airlines	direct
25 Dec - 06 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 642€

Return flights