Cheapest return flights from St. Louis to Denver in January from $48

AirHint found the following cheapest return flights from St. Louis (STL) to Denver (DEN) in January 2026 (see full year).

Return flights

21 Jan - 24 Jan Frontier Airlines direct
07 Jan - 10 Jan Frontier Airlines direct
14 Jan - 17 Jan Frontier Airlines direct
10 Jan - 12 Jan Frontier Airlines direct
31 Jan - 02 Feb Frontier Airlines direct
09 Jan - 12 Jan Frontier Airlines direct
23 Jan - 26 Jan Frontier Airlines direct
25 Jan - 28 Jan Frontier Airlines
28 Jan - 01 Feb Frontier Airlines
07 Jan - 01 Feb Frontier Airlines
08 Jan - 10 Jan Frontier Airlines
31 Jan - 03 Feb Frontier Airlines
23 Jan - 25 Jan Frontier Airlines
09 Jan - 11 Jan Frontier Airlines
31 Jan - 03 Feb United direct
15 Jan - 01 Feb Frontier Airlines
29 Jan - 01 Feb Southwest Airlines direct

Also check the deals for one-way flights from St. Louis to Denver in January.

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