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

Select a price to book. see full year.

Dates, airline, and price
Dates Airline Price
05 Oct Frontier Airlines
Direct Flight
08 Oct Frontier Airlines
Direct Flight
01 Oct Frontier Airlines
Direct Flight
17 Oct United
Direct Flight
20 Oct United
Direct Flight
07 Oct Southwest Airlines
21 Oct Southwest Airlines
13 Oct Southwest Airlines
03 Oct Southwest Airlines
04 Oct Frontier Airlines
Direct Flight
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deals for return flights from San Francisco to Ontario in October.

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Updated Jul 20, 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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