Cheapest return flights from Ontario to San Francisco in August from $97

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

Return flights

30 Aug - 30 Aug United direct
05 Aug - 12 Aug United direct
21 Aug - 25 Aug United direct
26 Aug - 27 Aug United direct
05 Aug - 05 Aug United direct
04 Aug - 11 Aug Frontier Airlines direct
11 Aug - 15 Aug Frontier Airlines direct
11 Aug - 22 Aug Frontier Airlines
15 Aug - 17 Aug Frontier Airlines direct
18 Aug - 21 Aug Frontier Airlines direct
29 Aug - 01 Sep Frontier Airlines
31 Aug - 05 Sep Frontier Airlines
29 Aug - 01 Sep Frontier Airlines direct
31 Aug - 02 Sep Frontier Airlines
30 Aug - 11 Sep Southwest Airlines
25 Aug - 01 Sep Southwest Airlines
28 Aug - 11 Sep Southwest Airlines
27 Aug - 04 Sep Southwest Airlines
31 Aug - 11 Sep Southwest Airlines
29 Aug - 11 Sep Southwest Airlines

Also check the deals for one-way 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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