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

Return flights

08 Dec - 08 Jan	Hawaiian Airlines
25 Dec - 19 Jan	Air Canada
07 Dec - 23 Dec	Hawaiian Airlines
12 Dec - 09 Jan	Alaska Airlines
03 Dec - 11 Dec	Hawaiian Airlines
07 Dec - 23 Dec	Qantas	direct
06 Dec - 12 Dec	Alaska Airlines
09 Dec - 12 Jan	United	direct
08 Dec - 07 Jan	Hawaiian Airlines
07 Dec - 15 Dec	Qantas
11 Dec - 17 Jan	Frontier Airlines
11 Dec - 19 Jan	Alaska Airlines
01 Dec - 09 Dec	Delta
07 Dec - 11 Jan	Zipair
20 Dec - 13 Jan	Frontier Airlines
25 Dec - 09 Jan	Frontier Airlines
24 Dec - 28 Dec	Air Canada
24 Dec - 31 Dec	United	direct
25 Dec - 28 Dec	Hawaiian Airlines
16 Dec - 23 Dec	Air Canada

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.

Book a cheap hotel in Sydney

Cheap car rent in Sydney

Cheapest return flights from San Francisco to Sydney in December from 887€

Return flights