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

Return flights

18 Nov - 18 Nov	Southwest Airlines
09 Nov - 10 Nov	Southwest Airlines
20 Nov - 24 Nov	Southwest Airlines
08 Nov - 16 Nov	Southwest Airlines
15 Nov - 22 Nov	Southwest Airlines
26 Nov - 01 Dec	Southwest Airlines
30 Nov - 19 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 $150

Return flights