AirHint found the following cheapest one-way flights from Ontario (ONT) to San Jose (SJO) in June 2026 (see full year).
One-Way flights
| 11 Jun | United | ||
| 02 Jun | Southwest Airlines | ||
| 01 Jun | Southwest Airlines | ||
| 12 Jun | Southwest Airlines | ||
| 04 Jun | Southwest Airlines | ||
| 05 Jun | Southwest Airlines |
Also check the deals for return flights from Ontario to San Jose in June.
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