Cheapest one-way flights from St. Louis to Denver in March from $39

AirHint found the following cheapest one-way flights from St. Louis (STL) to Denver (DEN) in March 2026 (see full year).

One-Way flights

09 Mar Frontier Airlines direct
16 Mar Frontier Airlines direct
23 Mar Frontier Airlines direct
21 Mar Frontier Airlines direct
20 Mar Frontier Airlines direct
13 Mar Frontier Airlines direct
22 Mar Southwest Airlines direct

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

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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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