Cheapest one-way flights from San Francisco to Ontario in September from $54

AirHint found the following cheapest one-way flights from San Francisco (SFO) to Ontario (ONT) in September 2025 (see full year).

One-Way flights

01 Sep Frontier Airlines direct
04 Sep Frontier Airlines direct
05 Sep Frontier Airlines direct
25 Sep Frontier Airlines direct
26 Sep Frontier Airlines direct
28 Sep Frontier Airlines direct
29 Sep Frontier Airlines direct
07 Sep Frontier Airlines direct
08 Sep Frontier Airlines direct
11 Sep Frontier Airlines direct

Also check the deals for return flights from San Francisco to Ontario in September.

Skyscanner

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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