Cheapest one-way flights from Ontario to San Jose in December from 208€

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

One-Way flights

31 Dec Frontier Airlines
08 Dec Southwest Airlines
09 Dec Southwest Airlines
10 Dec Southwest Airlines
06 Dec Southwest Airlines
16 Dec Southwest Airlines
11 Dec Southwest Airlines
12 Dec Southwest Airlines
21 Dec Southwest Airlines
25 Dec Southwest Airlines

Also check the deals for return flights from Ontario to San Jose in December.

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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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