Cheapest return flights from Ontario to San Francisco in August from 47€

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

Return flights

28 Aug - 01 Sep Frontier Airlines direct
08 Aug - 11 Aug Frontier Airlines direct
22 Aug - 25 Aug Frontier Airlines direct
21 Aug - 29 Aug Frontier Airlines direct
15 Aug - 18 Aug Frontier Airlines direct
14 Aug - 16 Aug United direct
14 Aug - 18 Aug United direct
08 Aug - 10 Aug Frontier Airlines direct
29 Aug - 01 Sep Frontier Airlines direct
01 Aug - 04 Aug Frontier Airlines direct
22 Aug - 24 Aug Frontier Airlines direct
22 Aug - 31 Aug Frontier Airlines direct
30 Aug - 01 Sep Frontier Airlines
30 Aug - 01 Sep United direct
22 Aug - 02 Sep Southwest Airlines
26 Aug - 02 Sep Southwest Airlines
27 Aug - 03 Sep Southwest Airlines
26 Aug - 04 Sep Southwest Airlines
31 Aug - 04 Sep Southwest Airlines
30 Aug - 13 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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