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

Return flights

11 Dec - 24 Dec	Alaska Airlines
01 Dec - 01 Jan	Hawaiian Airlines
12 Dec - 28 Dec	Alaska Airlines
12 Dec - 01 Jan	Alaska Airlines
12 Dec - 05 Jan	Alaska Airlines
24 Dec - 07 Jan	Alaska Airlines
12 Dec - 02 Jan	Alaska Airlines
02 Dec - 08 Dec	Asiana Airlines
29 Dec - 20 Jan	Asiana Airlines
28 Dec - 20 Jan	Asiana Airlines
16 Dec - 29 Dec	Asiana Airlines
15 Dec - 29 Dec	Asiana Airlines
17 Dec - 26 Dec	Alaska Airlines
17 Dec - 30 Dec	Asiana Airlines
17 Dec - 31 Dec	Alaska Airlines
24 Dec - 06 Jan	Asiana Airlines
16 Dec - 31 Dec	Asiana Airlines
22 Dec - 07 Jan	Asiana Airlines
23 Dec - 01 Jan	Asiana Airlines
18 Dec - 31 Dec	Hawaiian Airlines

Also check the deals for one-way flights from San Jose 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 Jose to Sydney in December from $1237

Return flights