Cheapest one-way flights from Ontario to San Francisco in September from $48

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

One-Way flights

29 Sep United direct
30 Sep United direct
10 Sep United direct
13 Sep United direct
03 Sep United direct
17 Sep United direct
23 Sep United direct
02 Sep United direct
22 Sep United direct
27 Sep United direct

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