Cheapest return flights from Ontario to San Francisco in August from $77

Best time to book flights for Ontario (ONT) to San Francisco (SFO) flights at AirHint

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

Return flights

07 Aug - 11 Aug United direct
15 Aug - 16 Aug Frontier Airlines direct
07 Aug - 10 Aug Frontier Airlines direct
01 Aug - 03 Aug Frontier Airlines direct
01 Aug - 04 Aug Frontier Airlines direct
15 Aug - 17 Aug Frontier Airlines direct
15 Aug - 19 Aug Southwest Airlines
22 Aug - 02 Sep Southwest Airlines
02 Aug - 03 Aug Southwest Airlines
30 Aug - 02 Sep Southwest Airlines
27 Aug - 30 Aug Southwest Airlines
11 Aug - 22 Aug Southwest Airlines
23 Aug - 02 Sep Southwest Airlines
29 Aug - 01 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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