AirHint found the following cheapest one-way flights from Ontario (ONT) to San Jose (SJO) in October 2025 (see full year).
One-Way flights
| 25 Oct | Avianca | ||
| 23 Oct | Avianca | ||
| 30 Oct | Frontier Airlines | ||
| 28 Oct | Avianca | ||
| 27 Oct | Southwest Airlines | ||
| 29 Oct | Southwest Airlines | ||
| 24 Oct | Southwest Airlines | ||
| 31 Oct | Southwest Airlines |
Also check the deals for return flights from Ontario to San Jose in October.
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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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