Cheapest one-way flights from Ontario to San Francisco in January from $109

AirHint found the following cheapest one-way flights from Ontario (ONT) to San Francisco (SFO) in January 2026 (see full year).

One-Way flights

14 Jan Southwest Airlines
12 Jan Southwest Airlines
10 Jan Southwest Airlines
09 Jan Southwest Airlines
26 Jan Southwest Airlines
11 Jan Southwest Airlines
05 Jan Frontier Airlines direct
01 Jan Southwest Airlines
19 Jan Southwest Airlines
02 Jan Southwest Airlines

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

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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