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

Return flights

06 Nov - 11 Nov	United	direct
13 Nov - 18 Nov	Frontier Airlines
12 Nov - 15 Nov	Frontier Airlines
14 Nov - 16 Nov	Frontier Airlines
14 Nov - 16 Nov	Frontier Airlines	direct
08 Nov - 11 Nov	Southwest Airlines
06 Nov - 22 Nov	Frontier Airlines	direct
15 Nov - 26 Nov	Frontier Airlines
10 Nov - 17 Nov	Southwest Airlines
23 Nov - 24 Nov	United	direct
17 Nov - 26 Dec	Frontier Airlines	direct
26 Nov - 01 Dec	Frontier Airlines	direct
29 Nov - 01 Dec	Southwest Airlines

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

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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Cheapest return flights from Ontario to San Francisco in November from $124

Return flights