Cheapest one-way flights from Ontario to San Francisco in August from $119

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 August 2025 (see full year).

One-Way flights

02 Aug Frontier Airlines direct
20 Aug Southwest Airlines
16 Aug Southwest Airlines
15 Aug Southwest Airlines
14 Aug Southwest Airlines
05 Aug Southwest Airlines
26 Aug Southwest Airlines
17 Aug Southwest Airlines
27 Aug Southwest Airlines
11 Aug Southwest Airlines

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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