Cheapest one-way flights from Ontario to San Francisco in October from $55

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

One-Way flights

06 Oct Frontier Airlines direct
09 Oct Frontier Airlines direct
02 Oct Frontier Airlines direct
03 Oct Frontier Airlines direct
30 Oct Southwest Airlines
08 Oct Southwest Airlines
28 Oct Southwest Airlines
29 Oct Southwest Airlines
22 Oct Southwest Airlines
16 Oct Southwest Airlines

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

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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