Cheapest one-way flights from San Francisco (SFO) to Ontario (ONT), September

Select a price to book. see full year.

Dates, airline, and price
Dates Airline Price
06 Sep Frontier Airlines
Direct Flight
02 Sep Frontier Airlines
Direct Flight
24 Sep Frontier Airlines
Direct Flight
22 Sep Frontier Airlines
15 Sep Southwest Airlines
16 Sep Southwest Airlines
09 Sep Southwest Airlines
30 Sep Southwest Airlines
29 Sep Southwest Airlines
26 Sep Southwest Airlines
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deals for return flights from San Francisco to Ontario in September.

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Updated Jul 19, 2026.

About these fares

These results come from our latest search across airlines for your currency. Prices change quickly and are not locked until you complete booking—always confirm the total and fare rules on the partner site.

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