Cheapest return flights from San Francisco to Ontario in October from $98

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

Return flights

27 Oct - 30 Oct Frontier Airlines direct
09 Oct - 16 Oct Frontier Airlines direct
17 Oct - 20 Oct Frontier Airlines direct
10 Oct - 13 Oct Frontier Airlines direct
17 Oct - 19 Oct Frontier Airlines direct
30 Oct - 02 Nov Frontier Airlines direct
02 Oct - 07 Oct Frontier Airlines
18 Oct - 20 Oct Frontier Airlines
21 Oct - 23 Oct Frontier Airlines
22 Oct - 23 Oct Frontier Airlines
07 Oct - 14 Oct Southwest Airlines
29 Oct - 02 Nov Southwest Airlines

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

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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