Southwest® flights from Denver to St. Louis from $73
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Low fares from Denver to St. Louis
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Denver (DEN)to
St. Louis (STL)
Depart: 01/31/2026
One-way
Basic
From
$73
Seen: 31 minutes ago
Denver (DEN)to
St. Louis (STL)
Depart: 01/17/2026
One-way
Basic
From
$73
Seen: 54 minutes ago
Denver (DEN)to
St. Louis (STL)
Depart: 01/20/2026
One-way
Basic
From
$90
Seen: 29 minutes ago
Denver (DEN)to
St. Louis (STL)
Depart: 01/06/2026
One-way
Basic
From
$90
Seen: 9 minutes ago
Denver (DEN)to
St. Louis (STL)
Depart: 01/07/2026
One-way
Basic
From
$90
Seen: 31 minutes ago
Denver (DEN)to
St. Louis (STL)
Depart: 02/24/2026
One-way
Basic
From
$90
Seen: 25 minutes ago
Explore flights from Denver to St. Louis
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Travel tips for your next Southwest flight
How to board the plane earlier on open seating flights departing on or before January 26, 2026:
Southwest seats are first come, first served based on check-in order. But there are ways to board the plane earlier!
- Purchase EarlyBird Check-In®1 for automatic check-in and a better boarding position.
- Purchase Upgraded Boarding2 to get an A1-A15 boarding position (depending on availability).
- Purchase a Business Select® fare or upgrade to Business Select to get a guaranteed A1-A15 boarding position.
Enjoy movies, sips, and snacks during your flight.
Take advantage of inflight entertainment with free movies4, free live TV5, free texting6, and $8 inflight Internet7.
We also offer free sodas, coffee, and snacks8—learn more about the inflight food and beverage experience.
Make the most of our Rapid Rewards® Program.
Rapid Rewards Members can redeem their points for flights, hotel stays, rental cars, gift cards, and more. And your points never expire!
Flight Details
Departing from:
Denver International Airport
Arriving at:
Lambert-St Louis Int'l Airport
Average flight time:
2 hours
Distance:
770 miles
Route Information
156† Weekly flights
- 6‡ Nonstop flights per day Monday through Friday
- 5‡ Nonstop flights on Saturday
- 7‡ Nonstop flights on Sunday
† Weekly flights based on DOT published scheduled average flights Monday through Sunday between 9/1/2025 and 9/30/2025. Note: route may not operate every day of the week.
‡ Nonstop flights based on DOT published scheduled average flights Monday through Sunday between 9/1/2025 and 9/30/2025.
Explore St. Louis
There’s so much to see in St. Louis, that it’s no wonder they call Missouri the Show-Me State! First and foremost, is St. Louis’ most famous landmark, the Gateway Arch! Built as a monument to the country's westward expansion, the Gateway Arch is an engineering marvel that spans 630 feet from leg to leg while rising 630 feet into the air! While you’re checking out the arch, you can learn more about it at the Museum of Westward Expansion and the Gateway Arch Visitors Center. The park surrounding the arch features miles of bike paths, and you can even hitch a ride to the top to take in some truly incredible aerial views of the city.
If you like the park surrounding Gateway Arch, you’ll like Forest Park even better. Almost double the size of New York’s famous Central Park, this aptly named urban park truly is sized more like a forest than a park, with a whopping 1,371 acres of meadows, trees, ponds, lakes, streams, golf courses, tennis courts, sculptures, wetlands, and wildlife. Originally built in 1876, Forest Park was the home of the 1904 World’s Fair and remains steeped in St. Louis history to this day. Known as the Heart of St. Louis, Forest Park is also home to great attractions like the St. Louis Zoo, the Saint Louis Art Museum, the St. Louis Science Center, and the Missouri History Museum.
Questions we hear the most
The average flight time from Denver to St. Louis is 2 hours.
There are 156 weekly flights from Denver to St. Louis on Southwest Airlines.
Yes, Southwest flies nonstop from Denver to St. Louis 6 times per day from Monday through Friday.
Yes, Southwest flies nonstop from Denver to St. Louis 5 times per day on Saturdays and 7 times per day on Sundays.
To find the lowest fares by day and time to fly Denver to St. Louis with Southwest, check out our Low Fare Calendar.
You can rent a car at Lambert-St Louis Int'l Airport book yours with your flight.
Yes! Flights from Denver to St. Louis—or from here or there to anywhere—can be changed with no change fees. Fare difference may apply.
Check the status of your upcoming Southwest flight.
Check out the Southwest Airlines® Help Center for answers about everything Southwest.
Explore Flights from Other Popular Origins
Popular Flights from Denver
1EarlyBird Check-In® pricing starts at $15 one-way, and is subject to availability. Pricing may vary based on the popularity and length of each (one-way) flight. Please see optional travel charges for more details.
2Upgraded boarding prices and benefits are per eligible segment. Flights must be within 24 hours of departure to be eligible for upgraded boarding.
3Where available. Available only on WiFi-enabled aircraft. Limited-time offer.
4Due to licensing restrictions, on WiFi-enabled international flights, free live TV and iHeartRadio may not be available for the full duration of flight.
5Texting only allows access to iMessage and WhatsApp (which must be downloaded and activated before connecting to SouthwestWiFi).
6Internet access for $8 per device from takeoff to landing. Price is subject to change. May not be available for the full duration of flight. In order to provide a top-notch Internet experience, we prohibit access to certain high-bandwidth applications and websites. We also prohibit access to certain obscene or offensive content.
7Flights traveling 175 miles or less will have only water available. Complimentary snacks are served on flights over 175 miles. If you’re flying between Hawaii and the continental U.S., you’ll have even more snacks to choose from.