1-856-513-6369

Cheap Flights from Denver to St Louis (DEN to STL) from $134.00

Compare the cheapest Denver (DEN) to St Louis (STL) fares found by our live flight search, then book online or over the phone with our travel experts.

📞 Call 1-856-513-6369
Adults
12+
1
Children
2–11
0
Infants
Under 2
0
Cabin
🏷️
Save up to 40% with unpublished phone fares
Consolidator deals on selected Denver → St Louis flights that do not appear in online search results. The live fares below are bookable right now — or call to check for an unpublished fare on your dates.
📞 1-856-513-6369

One-way fares Denver → St Louis

showing indicative fares · loading live prices…
Frontier
Frontier CHEAPEST
DEN → STL · Economy
lowest fare seen on this route
$224.55
$134.73
Select
United Airlines
United Airlines
DEN → STL · Economy
lowest fare seen on this route
$358.78
$215.27
Select
Southwest
Southwest
DEN → STL · Economy
lowest fare seen on this route
$365.65
$219.39
Select
American Airlines
American Airlines
DEN → STL · Economy
lowest fare seen on this route
$367.23
$220.34
Select
Delta Air Lines
Delta Air Lines
DEN → STL · Economy
lowest fare seen on this route
$369.78
$221.87
Select
Alaska Airlines
Alaska Airlines
DEN → STL · Economy
lowest fare seen on this route
$757.78
$454.67
Select
See all flights & times → Prices per adult, one way, incl. taxes & fees. Availability changes constantly.
📞 Call for phone-only fares ✈ See flights

Cheapest fares from Denver to St Louis

Lowest fare found per airline on the DEN → STL route, with our discounted phone-deal price.

AirlineCabin Found fareOur discounted fare Fare found on
Frontier Frontier Economy $224.55 $134.73 Sep 19, 2026 Book
United Airlines United Airlines Economy $358.78 $215.27 Sep 19, 2026 Book
Southwest Southwest Economy $365.65 $219.39 Sep 19, 2026 Book
American Airlines American Airlines Economy $367.23 $220.34 Sep 19, 2026 Book
Delta Air Lines Delta Air Lines Economy $369.78 $221.87 Sep 19, 2026 Book
Alaska Airlines Alaska Airlines Economy $757.78 $454.67 Sep 19, 2026 Book
Air Canada Air Canada Economy $975.71 $585.43 Sep 19, 2026 Book

Discounted fares are negotiated phone deals from our vendor network and may not appear in online search results — call 1-856-513-6369 to lock one in. Fares were found on the dates shown, are per person in USD, and change with availability.

Related routes

↩ St Louis to Denver Denver to Atlanta Denver to Calgary Denver to Cancún Denver to Chicago Denver to Chicago Denver to Cincinnati / Covington Atlanta to St Louis Detroit to St Louis Knoxville/Maryville to St Louis Myrtle Beach to St Louis New Orleans to St Louis Phoenix to St Louis All routes →

Why book with Globitude Travels

💸 Transparent pricing
The fare you see is all-inclusive — taxes and fees shown before you pay, never after.
🤝 Real travel experts
Every booking is reviewed by our team, and phone-only vendor deals can beat any online price.
🎧 24/7 human support
Before, during and after your trip — changes, cancellations and special requests handled by people.
🔒 Secure checkout
Encrypted payment, verified confirmation emails, and your PNR delivered as soon as the airline issues it.

Globitude Travels is an independent travel agency — call 1-856-513-6369 or use the search above to compare live fares on this route. See our terms, privacy policy, refund policy and service fees for full details, or contact us any time.

Page updated September 20, 2026 · fare data refreshed automatically from live flight searches.