Cheapest return flights from Ontario to San Jose in December from 409€

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

Return flights

07 Dec - 14 Dec United
09 Dec - 12 Dec Southwest Airlines
08 Dec - 12 Dec Southwest Airlines
08 Dec - 10 Dec Southwest Airlines
10 Dec - 18 Dec Southwest Airlines
08 Dec - 20 Dec Southwest Airlines
06 Dec - 10 Dec Southwest Airlines
10 Dec - 20 Dec Southwest Airlines
10 Dec - 17 Dec Southwest Airlines
08 Dec - 25 Dec Southwest Airlines
31 Dec - 08 Jan Southwest Airlines
25 Dec - 08 Jan Southwest Airlines
30 Dec - 05 Jan Southwest Airlines
27 Dec - 07 Jan Southwest Airlines
28 Dec - 05 Jan Southwest Airlines
29 Dec - 04 Jan Southwest Airlines
20 Dec - 06 Jan Southwest Airlines
25 Dec - 03 Jan Southwest Airlines
20 Dec - 05 Jan Southwest Airlines
27 Dec - 02 Jan Southwest Airlines

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

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