AirHint found the following cheapest return flights from San Francisco (SFO) to Ontario (ONT) in October 2026 (see full year).
Return flights
| 06 Oct - 07 Oct | Southwest Airlines | ||
| 06 Oct - 08 Oct | Southwest Airlines | ||
| 01 Oct - 11 Oct | Southwest Airlines | ||
| 09 Oct - 11 Oct | Southwest Airlines | ||
| 09 Oct - 11 Oct | United | direct |
Also check the deals for one-way flights from San Francisco to Ontario in October.
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