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

Return flights

02 Dec - 09 Dec	Qantas	direct
05 Dec - 12 Dec	Qantas	direct
07 Dec - 14 Dec	Qantas	direct
09 Dec - 16 Dec	Qantas	direct
03 Dec - 08 Dec	Hawaiian Airlines
04 Dec - 14 Jan	Frontier Airlines
08 Dec - 20 Dec	Hawaiian Airlines
03 Dec - 14 Jan	Frontier Airlines
24 Dec - 26 Jan	Cathay Pacific
01 Dec - 10 Dec	Cathay Pacific
31 Dec - 25 Jan	Cathay Pacific
05 Dec - 14 Jan	Frontier Airlines
01 Dec - 08 Dec	Cathay Pacific
01 Dec - 13 Dec	Hawaiian Airlines
08 Dec - 15 Dec	Cathay Pacific
27 Dec - 11 Jan	Hawaiian Airlines
26 Dec - 15 Jan	Air Canada
26 Dec - 11 Jan	Frontier Airlines
26 Dec - 09 Jan	Qantas	direct
31 Dec - 06 Jan	Hawaiian 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 903€

Return flights