Cheapest return flights from St. Louis to Denver in April from $150

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

Return flights

01 Apr - 06 Apr Frontier Airlines direct
23 Apr - 25 Apr Frontier Airlines
25 Apr - 27 Apr Frontier Airlines
30 Apr - 04 May Frontier Airlines
23 Apr - 25 Apr Frontier Airlines direct
25 Apr - 27 Apr Frontier Airlines direct
30 Apr - 04 May Frontier Airlines direct
02 Apr - 06 Apr Frontier Airlines
23 Apr - 26 Apr Frontier Airlines
23 Apr - 26 Apr Frontier Airlines direct
24 Apr - 26 Apr Frontier Airlines direct
15 Apr - 22 Apr Frontier Airlines

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

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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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