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

Return flights

10 Dec - 14 Dec	Alaska Airlines
12 Dec - 13 Jan	Alaska Airlines
10 Dec - 24 Dec	Alaska Airlines
09 Dec - 16 Dec	Alaska Airlines
12 Dec - 18 Dec	Hawaiian Airlines
10 Dec - 07 Jan	Alaska Airlines
31 Dec - 18 Jan	Alaska Airlines
18 Dec - 27 Dec	Hawaiian Airlines
24 Dec - 29 Dec	Hawaiian Airlines
12 Dec - 26 Dec	Hawaiian Airlines
16 Dec - 22 Dec	Alaska Airlines
17 Dec - 11 Jan	Hawaiian Airlines
23 Dec - 11 Jan	Alaska Airlines
19 Dec - 10 Jan	Hawaiian Airlines
22 Dec - 09 Jan	Alaska Airlines
25 Dec - 11 Jan	Alaska Airlines
24 Dec - 27 Dec	Hawaiian Airlines
18 Dec - 10 Jan	Hawaiian Airlines
06 Dec - 29 Dec	Qantas
14 Dec - 15 Jan	Qatar Airways

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 $1261

Return flights