Cheapest return flights from Denver to San Diego in December from $50

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

Return flights

18 Dec - 25 Dec Frontier Airlines direct
24 Dec - 01 Jan Frontier Airlines direct
22 Dec - 24 Dec Frontier Airlines direct
25 Dec - 29 Dec Frontier Airlines direct
24 Dec - 26 Dec Frontier Airlines direct
26 Dec - 29 Dec Frontier Airlines direct
22 Dec - 26 Dec Frontier Airlines direct
23 Dec - 26 Dec Frontier Airlines direct
21 Dec - 26 Dec Frontier Airlines direct
18 Dec - 22 Dec Frontier Airlines direct
18 Dec - 21 Dec Frontier Airlines direct
09 Dec - 17 Jan Frontier Airlines
03 Dec - 25 Jan Frontier Airlines
31 Dec - 04 Jan Frontier Airlines
31 Dec - 04 Jan Frontier Airlines direct
29 Dec - 02 Jan Frontier Airlines direct
09 Dec - 17 Jan Frontier Airlines direct
30 Dec - 02 Jan Frontier Airlines
30 Dec - 02 Jan Hawaiian Airlines direct
27 Dec - 01 Jan Frontier Airlines direct

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

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