Cheapest return flights from Ontario to San Francisco in August from $88

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

Return flights

08 Aug - 11 Aug Frontier Airlines direct
18 Aug - 21 Aug Frontier Airlines direct
15 Aug - 22 Aug Frontier Airlines direct
21 Aug - 25 Aug Frontier Airlines direct
11 Aug - 22 Aug Frontier Airlines direct
11 Aug - 18 Aug Frontier Airlines direct
22 Aug - 25 Aug Frontier Airlines direct
15 Aug - 17 Aug Frontier Airlines direct
01 Aug - 04 Aug Frontier Airlines direct
01 Aug - 03 Aug Frontier Airlines direct
22 Aug - 02 Sep Frontier Airlines
27 Aug - 01 Sep United direct
29 Aug - 03 Sep United direct
27 Aug - 03 Sep Southwest Airlines
30 Aug - 01 Sep United direct
21 Aug - 05 Sep Southwest Airlines
21 Aug - 12 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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