Cheapest one-way flights from Ontario to San Francisco in August from $33

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

One-Way flights

25 Aug Frontier Airlines direct
26 Aug United direct
27 Aug United direct
28 Aug United direct
23 Aug United direct
11 Aug Frontier Airlines direct
04 Aug United direct
05 Aug United direct
22 Aug Frontier Airlines direct
29 Aug Frontier Airlines direct

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

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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