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

Return flights

24 Dec - 26 Jan	Cathay Pacific
28 Dec - 14 Jan	Hawaiian Airlines
26 Dec - 18 Jan	Cathay Pacific
23 Dec - 26 Jan	Cathay Pacific
24 Dec - 18 Jan	Cathay Pacific
23 Dec - 18 Jan	Cathay Pacific
26 Dec - 14 Jan	Cathay Pacific
27 Dec - 17 Jan	Air India
28 Dec - 14 Jan	United	direct
24 Dec - 12 Jan	United	direct
24 Dec - 31 Dec	United	direct
23 Dec - 26 Dec	Cathay Pacific
23 Dec - 30 Dec	Qantas
23 Dec - 31 Dec	Cathay Pacific
23 Dec - 29 Dec	China Airlines
23 Dec - 31 Dec	United	direct
23 Dec - 29 Dec	United	direct
23 Dec - 30 Dec	United	direct
23 Dec - 26 Dec	United	direct
20 Dec - 31 Dec	Frontier 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 941€

Return flights