Flights from Denver to St. Louis
North AmericaYear-round

Cheap Flights from Denver to St. Louis

Track economy fares on the DEN → STL route and get alerts when prices drop.

From
Denver
DEN
To
St. Louis
STL

Route Intelligence: Denver → St. Louis

Flight Duration

2 hr 17 min (Direct)

Price Guidance

A good deal is under $250 roundtrip. Standard fare is $350–$500+.

Peak Season

Jun-Aug

Top Airlines

United Airlines, Southwest Airlines

Booking Tip

Book 1-3 months in advance for the best domestic fares.

Track Denver → St. Louis Fares

Set your target price and FlightKitten will scan this route twice daily. The instant economy fares drop below your budget, you'll get an email with the price, airline, and a direct booking link.

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Route Summary: Denver → St. Louis

From
Denver (DEN)
To
St. Louis (STL)
Duration
2 hr 17 min (Direct)
Airlines
United Airlines, Southwest Airlines
Price Guide
A good deal is under $250 roundtrip. Standard fare is $350–$500+.
Tracking
FlightKitten scans 220+ airlines 2× daily
220+
Airlines Monitored
2×
Daily Scanning
AI
Deal Briefings
7-Day
Free Trial
Premium Cabin

Prefer business class on this route?

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Everyone deserves comfort at an affordable price. CEOFLIGHTS Personal Travel Managers find you the best business class fares and handle every detail of your journey.

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Also available: BestBusinessClass.com

Other Routes to St. Louis

New York→St. LouisLos Angeles→St. LouisChicago→St. LouisMiami→St. LouisSan Francisco→St. LouisBoston→St. Louis

More Destinations in North America

Anchorage
Anchorage
Atlanta
Atlanta
Austin
Austin
Boston
Boston
Charleston
Charleston
Charlotte
Charlotte

Route Briefing: Denver to St. Louis

Spanning 770 miles in 2 hours and 10 minutes, the nonstop flight from Denver to St. Louis connects the Rockies with Missouri's Gateway to the West. United Airlines and Southwest fly between Denver and St. Louis Lambert International Airport (STL).

St. Louis welcomes visitors with iconic landmarks, rich history, and world-class free attractions. Take the tram to the top of the 630-foot Gateway Arch for panoramic views of the Mississippi River, explore the free museums and zoo inside Forest Park, and let your imagination run wild at the eccentric City Museum. Don't leave without tasting crispy toasted ravioli on The Hill or enjoying slow-smoked St. Louis-style barbecue.

Economy fares under $120 roundtrip represent solid value, with standard tickets sitting between $170 and $260. Summer brings outdoor concerts, riverfront festivals, and Cardinals baseball games at Busch Stadium. Book 3 to 5 weeks in advance for the best economy fares.

How much are flights from Denver to St. Louis in 2026?

Flight prices from Denver (DEN) to St. Louis (STL) vary significantly depending on the season, day of the week, and how far in advance you book. A good deal is under $250 roundtrip. Standard fare is $350–$500+. Popular carriers on this route include United Airlines, Southwest Airlines. FlightKitten eliminates the guesswork by monitoring 220+ airlines twice daily and alerting you the moment economy fares hit your target price.

How does FlightKitten track Denver to St. Louis fares?

FlightKitten is an economy flight price monitoring platform that scans 220+ airlines twice every day for economy fares on the DEN to STL route. When you set a target price, FlightKitten continuously monitors this route and sends an email alert the moment fares drop below your budget. Each alert includes the exact fare, airline, dates, and an AI-powered briefing that explains whether the deal is genuinely good compared to historical pricing on this route. No more obsessive price checking — set your budget and let FlightKitten do the watching. Learn more about how FlightKitten tracking works.

See our full St. Louis destination guide for all available routes. Also popular: Denver to Anchorage.

Pro tip: Book 1-3 months in advance for the best domestic fares.

Looking for business class on this route? CEOFLIGHTS pairs you with a Personal Travel Manager who finds affordable business class fares and handles every detail of your journey. Alternatively, BestBusinessClass.com offers free expert quotes with real savings.