Southwest® flights from St. Louis to Denver from $73
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Low fares from St. Louis to Denver
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St. Louis (STL)to
Denver (DEN)
Depart: 02/07/2026
One-way
Basic
From
$73
Seen: 1 hour ago
St. Louis (STL)to
Denver (DEN)
Depart: 01/24/2026
One-way
Basic
From
$73
Seen: 47 minutes ago
St. Louis (STL)to
Denver (DEN)
Depart: 01/28/2026
One-way
Basic
From
$79
Seen: 2 hrs ago
St. Louis (STL)to
Denver (DEN)
Depart: 01/13/2026
One-way
Basic
From
$90
Seen: 56 minutes ago
St. Louis (STL)to
Denver (DEN)
Depart: 01/07/2026
One-way
Basic
From
$90
Seen: 1 hour ago
St. Louis (STL)to
Denver (DEN)
Depart: 02/17/2026
One-way
Basic
From
$90
Seen: 2 hrs ago
Explore flights from St. Louis to Denver
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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:
Lambert-St Louis Int'l Airport
Arriving at:
Denver International Airport
Average flight time:
2 hours 20 minutes
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 Denver
Escape to the Mile High City for delicious eats, gorgeous views, and outdoor adventures. From walking down a promenade for some window shopping to whizzing down some of the best ski slopes in the nation, you won’t experience a dull moment in this city that mixes mountain living with exciting city activities. Summer or winter, Denver is a gem you won’t want to miss.
If you’re hoping to see the great outdoors in a new light, Denver has an eclectic mix of activities for you to try on your own or with family and friends. Take a hike at Red Rocks Park, part of the Denver Mountain Parks system and well known for its red sandstone outcrops that gaze over the city. If you visit Red Rocks, you might also want to consider catching a concert at the amphitheater. Depending on the season of your visit, you may also enjoy skiing and snowboarding at popular locations such as Vail Mountain or whitewater rafting on the Colorado River. Tie your laces or buckle your boots for an adventure.
Questions we hear the most
The average flight time from St. Louis to Denver is 2 hours 20 minutes.
There are 156 weekly flights from St. Louis to Denver on Southwest Airlines.
Yes, Southwest flies nonstop from St. Louis to Denver 6 times per day from Monday through Friday.
Yes, Southwest flies nonstop from St. Louis to Denver 5 times per day on Saturdays and 7 times per day on Sundays.
To find the lowest fares by day and time to fly St. Louis to Denver with Southwest, check out our Low Fare Calendar.
You can rent a car at Denver International Airport book yours with your flight.
Yes! Flights from St. Louis to Denver—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 St. Louis
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.