Cheapest one-way flights from Ontario to San Francisco in December from $175

Best time to book flights for Ontario (ONT) to San Francisco (SFO) flights at AirHint

AirHint found the following cheapest one-way flights from Ontario (ONT) to San Francisco (SFO) in December 2025 (see full year).

One-Way flights

02 Dec Southwest Airlines
12 Dec Southwest Airlines
10 Dec Southwest Airlines
17 Dec Southwest Airlines
18 Dec Southwest Airlines
07 Dec Southwest Airlines
06 Dec Southwest Airlines
23 Dec Southwest Airlines
21 Dec Southwest Airlines
28 Dec Southwest Airlines

Also check the deals for return flights from Ontario to San Francisco in December.

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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