Cheapest one-way flights from St. Louis to Denver in October from $59

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

One-Way flights

15 Oct Frontier Airlines direct
03 Oct Frontier Airlines direct
16 Oct Frontier Airlines
16 Oct Southwest Airlines direct

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

Skyscanner

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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