Cheapest return flights from Seattle to San Jose in December from 322€

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

Return flights

08 Dec - 15 Dec Delta
31 Dec - 31 Jan United
11 Dec - 15 Dec United
10 Dec - 17 Dec United
10 Dec - 24 Dec United
11 Dec - 18 Dec United
15 Dec - 31 Jan United
24 Dec - 29 Dec Alaska Airlines
24 Dec - 27 Dec Frontier Airlines
25 Dec - 04 Jan Frontier Airlines
27 Dec - 03 Jan Frontier Airlines
24 Dec - 03 Jan Frontier Airlines
18 Dec - 04 Jan Frontier Airlines
27 Dec - 04 Jan Frontier Airlines
26 Dec - 03 Jan Hawaiian Airlines
21 Dec - 30 Dec Copa

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

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