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

Return flights

04 Feb - 07 Feb	Frontier Airlines	direct
20 Feb - 25 Feb	Frontier Airlines	direct
06 Feb - 09 Feb	Frontier Airlines	direct
06 Feb - 10 Feb	Frontier Airlines
07 Feb - 12 Feb	Frontier Airlines
03 Feb - 07 Feb	Frontier Airlines
05 Feb - 09 Feb	Frontier Airlines
06 Feb - 08 Feb	Frontier Airlines
03 Feb - 07 Feb	United	direct
17 Feb - 21 Feb	United	direct
26 Feb - 08 Mar	Alaska Airlines

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

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

Return flights