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

Return flights

13 Dec - 09 Jan	Hawaiian Airlines
12 Dec - 09 Jan	Alaska Airlines
15 Dec - 09 Jan	Hawaiian Airlines
06 Dec - 04 Jan	Hawaiian Airlines
14 Dec - 06 Jan	Alaska Airlines
28 Dec - 11 Jan	Alaska Airlines
07 Dec - 13 Jan	Qantas
22 Dec - 29 Dec	Alaska Airlines
03 Dec - 11 Dec	Qantas
19 Dec - 09 Jan	Alaska Airlines
08 Dec - 08 Jan	Qantas
06 Dec - 08 Jan	Qantas
05 Dec - 13 Dec	Qantas
21 Dec - 29 Dec	Alaska Airlines
22 Dec - 30 Dec	Alaska Airlines
19 Dec - 31 Dec	Alaska Airlines
18 Dec - 25 Dec	Hawaiian Airlines
24 Dec - 30 Dec	Alaska Airlines
23 Dec - 31 Dec	Hawaiian Airlines
24 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 $1239

Return flights