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

Return flights

05 Sep - 14 Sep	American Airlines
13 Sep - 23 Sep	Hawaiian Airlines
06 Sep - 12 Sep	Hawaiian Airlines
04 Sep - 18 Sep	Alaska Airlines
29 Sep - 06 Oct	Delta
04 Sep - 11 Sep	Alaska Airlines
30 Sep - 07 Oct	Alaska Airlines
05 Sep - 04 Oct	Alaska Airlines
02 Sep - 15 Oct	Alaska Airlines
24 Sep - 10 Oct	Alaska Airlines
30 Sep - 30 Oct	Alaska Airlines
19 Sep - 10 Oct	Alaska Airlines
01 Sep - 06 Sep	Hawaiian Airlines
26 Sep - 30 Sep	Hawaiian Airlines
04 Sep - 13 Sep	Hawaiian Airlines
13 Sep - 27 Sep	Hawaiian Airlines
10 Sep - 21 Sep	Hawaiian Airlines
25 Sep - 12 Oct	Japan Airlines

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 $935

Return flights