Cheapest return flights from Seattle to San Jose in December from $450

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

Return flights

05 Dec - 07 Dec American Airlines
04 Dec - 13 Dec United
05 Dec - 14 Dec United
21 Dec - 28 Dec Sun Country Airlines
25 Dec - 04 Jan Alaska Airlines
20 Dec - 27 Dec Sun Country Airlines
28 Dec - 02 Jan Hawaiian Airlines
20 Dec - 03 Jan Sun Country Airlines
24 Dec - 03 Jan Hawaiian Airlines

Also check the deals for one-way flights from Seattle to San Jose in December.

Skyscanner

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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