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

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

One-Way flights

01 Oct United direct
02 Oct United direct
23 Oct United direct
07 Oct United direct
14 Oct United direct
11 Oct United direct
22 Oct United direct
25 Oct United direct
16 Oct Frontier Airlines direct
30 Oct Frontier Airlines direct

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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