Cheapest return flights from St. Louis to Denver in October from $98

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

Return flights

04 Oct - 07 Oct Frontier Airlines direct
22 Oct - 29 Oct Frontier Airlines direct
04 Oct - 06 Oct Frontier Airlines direct
04 Oct - 08 Oct Frontier Airlines direct
03 Oct - 04 Oct Frontier Airlines direct
02 Oct - 05 Oct Frontier Airlines direct
06 Oct - 08 Oct Frontier Airlines direct
22 Oct - 26 Oct Frontier Airlines direct
15 Oct - 21 Oct Frontier Airlines direct
23 Oct - 26 Oct Frontier Airlines direct

Also check the deals for one-way 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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