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

Return flights

08 Sep - 23 Sep	Alaska Airlines
15 Sep - 22 Sep	Alaska Airlines
01 Sep - 08 Sep	Alaska Airlines
07 Sep - 22 Sep	Alaska Airlines
09 Sep - 23 Sep	Alaska Airlines
13 Sep - 30 Sep	Alaska Airlines
06 Sep - 19 Sep	Alaska Airlines
26 Sep - 09 Oct	Alaska Airlines
03 Sep - 20 Sep	Hawaiian Airlines
08 Sep - 26 Sep	Alaska Airlines
24 Sep - 08 Oct	Qantas
21 Sep - 29 Sep	Asiana Airlines
26 Sep - 04 Oct	Asiana Airlines
30 Sep - 05 Oct	Qantas

Also check the deals for one-way flights from San Jose to Sydney in September.

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 September from $851

Return flights