Cheapest return flights from Ontario to San Francisco in December from 129€

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

Return flights

09 Dec - 10 Dec Southwest Airlines
10 Dec - 17 Dec Southwest Airlines
09 Dec - 11 Dec Southwest Airlines
10 Dec - 07 Jan Southwest Airlines
08 Dec - 10 Dec Southwest Airlines
16 Dec - 09 Jan Southwest Airlines
17 Dec - 24 Dec Southwest Airlines
02 Dec - 04 Dec Southwest Airlines
08 Dec - 08 Dec Southwest Airlines
17 Dec - 02 Jan Southwest Airlines
01 Dec - 17 Dec Southwest Airlines
24 Dec - 31 Dec Southwest Airlines
15 Dec - 03 Jan Southwest Airlines
11 Dec - 28 Dec Southwest Airlines
19 Dec - 06 Jan Southwest Airlines
29 Dec - 05 Jan Southwest Airlines
25 Dec - 04 Jan Southwest Airlines
30 Dec - 04 Jan Southwest Airlines
28 Dec - 03 Jan Southwest Airlines

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

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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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