Flights from Denver, CO to St. Louis, MO

Promo Code

Best Deals on Flights From Denver, CO (DEN) to St. Louis, MO (STL)

*Prices found by others in the previous 48 hours for round-trip flights. Prices shown may also require membership in our travel club, Discount Den.

Flights Deals from Denver, CO to St. Louis, MO on Frontier

$
Flights Deals from Denver, CO to St. Louis, MO on Frontier
From
To
Denver, CO (DEN)St. Louis, MO (STL)One-way
/
Departing Dec 15, 2025

From

$34

Last seen: 7 hours ago

*Prices found by others in the previous 48 hours for one-way flights. Prices shown may also require membership in our travel club, Discount Den®.

Denver, CO St. Louis, MO

Barclays Badge

Earn up to 50,000 Travel Miles after qualifying activity!
Terms Apply.