AirHint found the following cheapest one-way flights from Ontario (ONT) to San Jose (SJO) in January 2026 (see full year).
One-Way flights
| 17 Jan | Avianca | ||
| 20 Jan | Avianca | ||
| 22 Jan | Avianca | ||
| 25 Jan | Avianca | ||
| 24 Jan | Avianca | ||
| 31 Jan | Avianca | ||
| 13 Jan | Avianca | ||
| 26 Jan | Southwest Airlines | ||
| 21 Jan | Southwest Airlines | ||
| 05 Jan | Frontier Airlines |
Also check the deals for return flights from Ontario to San Jose in January.
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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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