Cheapest one-way flights from Ontario to San Francisco in August from $28

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

One-Way flights

06 Aug United direct
12 Aug United direct
24 Aug Frontier Airlines direct
04 Aug Frontier Airlines direct
01 Aug Frontier Airlines direct
09 Aug United direct
18 Aug Frontier Airlines direct
17 Aug Frontier Airlines direct
29 Aug Frontier Airlines direct
15 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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