Cheapest return flights from Denver to San Francisco in December from $137

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

Return flights

15 Dec - 09 Jan Frontier Airlines
14 Dec - 09 Jan Frontier Airlines direct
22 Dec - 03 Jan Frontier Airlines
21 Dec - 03 Jan Frontier Airlines
20 Dec - 04 Jan Frontier Airlines
20 Dec - 03 Jan Frontier Airlines
24 Dec - 01 Jan Frontier Airlines
21 Dec - 27 Dec Frontier Airlines
15 Dec - 16 Dec Frontier Airlines
31 Dec - 06 Jan Frontier Airlines direct
12 Dec - 14 Dec Frontier Airlines direct
23 Dec - 03 Jan Frontier Airlines
23 Dec - 30 Dec Frontier Airlines
16 Dec - 17 Dec Frontier Airlines
24 Dec - 28 Dec Frontier Airlines
13 Dec - 14 Dec Frontier Airlines
20 Dec - 03 Jan Frontier Airlines direct
20 Dec - 27 Dec Frontier Airlines direct
20 Dec - 28 Dec Frontier Airlines direct
10 Dec - 31 Dec Frontier Airlines

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

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