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

Return flights

29 Oct - 05 Nov	Alaska Airlines
21 Oct - 30 Oct	United
22 Oct - 30 Oct	United
03 Oct - 10 Oct	American Airlines
01 Oct - 04 Oct	American Airlines
05 Oct - 13 Oct	Alaska Airlines
14 Oct - 27 Oct	Alaska Airlines
05 Oct - 12 Oct	American 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 $328

Return flights