AirHint found the following cheapest return flights from San Francisco (SFO) to Sydney (SYD) in December 2025 (see full year).

Return flights

14 Dec - 28 Dec	Fiji Airways
01 Dec - 15 Dec	Air New Zealand
26 Dec - 17 Jan	Fiji Airways
28 Dec - 19 Jan	Fiji Airways
13 Dec - 08 Jan	Fiji Airways
28 Dec - 20 Jan	Fiji Airways
02 Dec - 05 Jan	Alaska Airlines
01 Dec - 07 Jan	Air New Zealand
09 Dec - 07 Jan	Hawaiian Airlines
04 Dec - 14 Dec	Delta
07 Dec - 05 Jan	Alaska Airlines
13 Dec - 20 Dec	Air Canada
14 Dec - 07 Jan	Alaska Airlines
09 Dec - 05 Jan	Alaska Airlines
13 Dec - 19 Dec	Fiji Airways
23 Dec - 30 Dec	Qantas
19 Dec - 26 Dec	Air Canada
20 Dec - 27 Dec	Air Canada
21 Dec - 30 Dec	Qantas
14 Dec - 28 Dec	United	direct

Also check the deals for one-way flights from San Francisco 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 San Francisco to Sydney in December from $951

Return flights