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

Return flights

27 Oct - 12 Nov	Alaska Airlines
06 Oct - 21 Oct	Qantas
21 Oct - 06 Nov	Alaska Airlines
31 Oct - 19 Nov	Alaska Airlines
09 Oct - 21 Oct	Hawaiian Airlines
01 Oct - 21 Oct	Alaska Airlines
03 Oct - 18 Oct	Alaska Airlines
18 Oct - 04 Nov	Alaska Airlines
08 Oct - 15 Oct	Qantas
04 Oct - 13 Oct	Alaska Airlines
11 Oct - 18 Oct	Alaska Airlines
01 Oct - 08 Oct	Qantas
07 Oct - 15 Oct	Qantas
11 Oct - 22 Oct	Qantas
01 Oct - 30 Nov	Asiana Airlines

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

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 October from $858

Return flights