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

Return flights

13 Dec - 13 Jan	Air Canada
01 Dec - 14 Dec	Hawaiian Airlines
30 Dec - 13 Jan	Air Canada
16 Dec - 25 Dec	Air Canada
16 Dec - 13 Jan	Air Canada
09 Dec - 23 Dec	Qantas	direct
30 Dec - 13 Jan	United	direct
31 Dec - 11 Jan	United	direct
10 Dec - 16 Dec	ANA
28 Dec - 16 Jan	Air Canada
06 Dec - 26 Dec	Qantas
24 Dec - 08 Jan	United	direct
11 Dec - 21 Dec	United	direct
11 Dec - 16 Dec	Air Canada
30 Dec - 07 Jan	United
16 Dec - 04 Jan	Air Canada
21 Dec - 18 Jan	Air Canada
23 Dec - 29 Dec	Air Canada
12 Dec - 24 Dec	United	direct
17 Dec - 24 Dec	ANA

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 856€

Return flights