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

Return flights

06 Dec - 15 Jan	Air Canada
08 Dec - 25 Dec	Air Canada
04 Dec - 11 Dec	Air Canada
05 Dec - 21 Jan	Fiji Airways
07 Dec - 21 Dec	Air New Zealand
05 Dec - 12 Dec	Qantas	direct
07 Dec - 14 Dec	Qantas	direct
08 Dec - 20 Dec	Air New Zealand
06 Dec - 15 Jan	United	direct
06 Dec - 16 Dec	United	direct
08 Dec - 25 Dec	United	direct
01 Dec - 08 Dec	United	direct
07 Dec - 21 Dec	United	direct
05 Dec - 21 Jan	United	direct
03 Dec - 23 Jan	United	direct
10 Dec - 20 Jan	Cathay Pacific
11 Dec - 24 Jan	Air Canada
29 Dec - 18 Jan	Cathay Pacific
26 Dec - 17 Jan	Air Premia
24 Dec - 17 Jan	Cathay Pacific

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 798€

Return flights