AirHint found the following cheapest return flights from Ontario (ONT) to San Jose (SJO) in August 2026 (see full year).
Return flights
| 15 Aug - 18 Aug | Avianca | ||
| 03 Aug - 08 Aug | jetBlue | ||
| 16 Aug - 23 Aug | Southwest Airlines | ||
| 07 Aug - 16 Aug | Southwest Airlines |
Also check the deals for one-way flights from Ontario to San Jose in August.
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