Cheapest return flights from San Diego to Denver in December from $63

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

Return flights

17 Dec - 20 Dec Frontier Airlines direct
17 Dec - 21 Dec Frontier Airlines direct
25 Dec - 30 Dec Frontier Airlines
31 Dec - 03 Jan Frontier Airlines direct
31 Dec - 04 Jan Frontier Airlines
15 Dec - 19 Dec Frontier Airlines
19 Dec - 24 Dec Alaska Airlines direct
26 Dec - 29 Dec Frontier Airlines direct
05 Dec - 07 Dec Frontier Airlines direct
19 Dec - 23 Dec Frontier Airlines
19 Dec - 23 Dec Alaska Airlines direct
31 Dec - 04 Jan Hawaiian Airlines direct
05 Dec - 09 Dec Frontier Airlines
26 Dec - 02 Jan Frontier Airlines direct
27 Dec - 02 Jan Frontier Airlines
28 Dec - 02 Jan Frontier Airlines
27 Dec - 03 Jan Frontier Airlines direct
27 Dec - 02 Jan Frontier Airlines direct
28 Dec - 03 Jan Frontier Airlines
22 Dec - 04 Jan Frontier Airlines

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

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