Cheapest one-way flights from Ontario to San Francisco in October from $107

Best time to book flights for Ontario (ONT) to San Francisco (SFO) flights at AirHint

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

One-Way flights

02 Oct Southwest Airlines
15 Oct Southwest Airlines
07 Oct Southwest Airlines
29 Oct Southwest Airlines
08 Oct Southwest Airlines
04 Oct Southwest Airlines
17 Oct Southwest Airlines
18 Oct Southwest Airlines
06 Oct Southwest Airlines
03 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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