Cheapest return flights from San Francisco to Ontario in September from 221€

AirHint found the following cheapest return flights from San Francisco (SFO) to Ontario (ONT) in September 2026 (see full year).

Return flights

04 Sep - 06 Sep Frontier Airlines direct
19 Sep - 23 Sep Southwest Airlines
20 Sep - 23 Sep Southwest Airlines
06 Sep - 09 Sep Southwest Airlines
20 Sep - 22 Sep Southwest Airlines
05 Sep - 09 Sep Southwest Airlines
11 Sep - 15 Sep Southwest Airlines
12 Sep - 19 Sep Southwest Airlines
05 Sep - 08 Sep Southwest Airlines
12 Sep - 25 Sep Southwest Airlines

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

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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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