AirHint found the following cheapest return flights from Seattle (SEA) to San Jose (SJO) in October 2025 (see full year).

Return flights

06 Oct - 13 Oct	Alaska Airlines
07 Oct - 14 Oct	Alaska Airlines
13 Oct - 20 Oct	Alaska Airlines
13 Oct - 23 Oct	Alaska Airlines
20 Oct - 30 Oct	Alaska Airlines
20 Oct - 27 Oct	Alaska Airlines
21 Oct - 28 Oct	Alaska Airlines
14 Oct - 23 Oct	Alaska Airlines
04 Oct - 09 Oct	Alaska Airlines
11 Oct - 16 Oct	Alaska Airlines
22 Oct - 01 Nov	Alaska Airlines
24 Oct - 03 Nov	Alaska Airlines
23 Oct - 02 Nov	Alaska Airlines
31 Oct - 02 Nov	Hawaiian Airlines

Also check the deals for one-way flights from Seattle to San Jose 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 Seattle to San Jose in October from $322

Return flights