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

Return flights

02 Dec - 09 Dec	United
09 Dec - 29 Dec	United
03 Dec - 12 Jan	United
01 Dec - 08 Dec	United
03 Dec - 09 Dec	United	direct
31 Dec - 19 Jan	United	direct
29 Dec - 13 Jan	United	direct
29 Dec - 19 Jan	United	direct
31 Dec - 18 Jan	United	direct
07 Dec - 21 Dec	United
01 Dec - 09 Dec	United
29 Dec - 12 Jan	United
05 Dec - 08 Dec	United	direct
02 Dec - 18 Dec	United	direct
02 Dec - 19 Dec	United	direct
04 Dec - 23 Dec	United	direct
04 Dec - 16 Jan	United
09 Dec - 13 Jan	Hawaiian Airlines
09 Dec - 15 Jan	Alaska Airlines
31 Dec - 25 Jan	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 735€

Return flights