Cheapest one-way flights from Seattle to San Jose in December from 144€

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

One-Way flights

10 Dec Delta
29 Dec Alaska Airlines
04 Dec Frontier Airlines
08 Dec Alaska Airlines
02 Dec Alaska Airlines
01 Dec Frontier Airlines
28 Dec Sun Country Airlines
22 Dec Alaska Airlines
27 Dec American Airlines
25 Dec American Airlines

Also check the deals for return 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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