Cheapest one-way flights from St. Louis to Denver in December from $74

AirHint found the following cheapest one-way flights from St. Louis (STL) to Denver (DEN) in December 2025 (see full year).

One-Way flights

20 Dec Frontier Airlines direct
22 Dec Frontier Airlines
23 Dec Frontier Airlines
12 Dec Frontier Airlines
19 Dec Frontier Airlines
31 Dec Frontier Airlines direct
08 Dec Frontier Airlines
25 Dec Frontier Airlines
30 Dec Frontier Airlines
22 Dec Frontier Airlines direct

Also check the deals for return flights from St. Louis to Denver in December.

Powered by

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.

Book a cheap hotel in Denver

Cheap car rent in Denver

Feel free to contact us with any feedback or request another flight research.