Cheapest one-way flights from Denver to San Diego in December from $25

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

One-Way flights

24 Dec Frontier Airlines direct
18 Dec Frontier Airlines direct
25 Dec Frontier Airlines direct
16 Dec Frontier Airlines direct
17 Dec Frontier Airlines direct
31 Dec Frontier Airlines direct
14 Dec Frontier Airlines direct
21 Dec Frontier Airlines direct
23 Dec Frontier Airlines direct
29 Dec Frontier Airlines direct

Also check the deals for return flights from Denver to San Diego 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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