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

Return flights

09 Dec - 13 Jan	ANA
01 Dec - 10 Dec	Alaska Airlines
05 Dec - 13 Dec	Fiji Airways
09 Dec - 13 Jan	United	direct
04 Dec - 14 Dec	Qantas
04 Dec - 14 Dec	United	direct
05 Dec - 19 Dec	Fiji Airways
05 Dec - 13 Dec	United	direct
05 Dec - 19 Dec	United	direct
08 Dec - 12 Dec	Air Canada
06 Dec - 12 Dec	ANA
02 Dec - 05 Jan	Qantas
22 Dec - 15 Jan	Air Canada
02 Dec - 05 Jan	United	direct
20 Dec - 17 Jan	Hawaiian Airlines
28 Dec - 04 Jan	Qantas
26 Dec - 05 Jan	United	direct
08 Dec - 12 Dec	United	direct
19 Dec - 09 Jan	Philippine Airlines
16 Dec - 04 Jan	Asiana Airlines

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 905€

Return flights