Cheapest return flights from San Francisco to Ontario in August from $57

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

Return flights

04 Aug - 11 Aug United direct
28 Aug - 31 Aug Frontier Airlines direct
11 Aug - 17 Aug Frontier Airlines direct
11 Aug - 15 Aug Frontier Airlines direct
08 Aug - 10 Aug Frontier Airlines direct
07 Aug - 10 Aug United direct
22 Aug - 28 Aug Frontier Airlines direct
08 Aug - 15 Aug Frontier Airlines direct
01 Aug - 04 Aug Frontier Airlines direct
10 Aug - 15 Aug Frontier Airlines direct
28 Aug - 01 Sep Frontier Airlines direct
27 Aug - 03 Sep Southwest Airlines
26 Aug - 09 Sep Southwest Airlines
19 Aug - 20 Sep Southwest Airlines
29 Aug - 01 Sep Frontier Airlines direct
16 Aug - 01 Sep Frontier Airlines
29 Aug - 03 Sep Frontier Airlines
20 Aug - 02 Sep Southwest Airlines
29 Aug - 06 Sep Southwest Airlines
29 Aug - 03 Sep United direct

Also check the deals for one-way flights from San Francisco to Ontario 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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