Southwest® flights from St. Louis to Denver from $89
expand_more
1 Passenger
expand_morePromo Code
expand_moretoday
today
Low fares from St. Louis to Denver
$
St. Louis (STL)to
Denver (DEN)
Depart: 10/20/2026
One-way
Basic
From
$89
Seen: 11 hrs ago
St. Louis (STL)to
Denver (DEN)
Depart: 11/07/2026
One-way
Basic
From
$89
Seen: 12 hrs ago
St. Louis (STL)to
Denver (DEN)
Depart: 10/28/2026
One-way
Basic
From
$89
Seen: 9 hrs ago
St. Louis (STL)to
Denver (DEN)
Depart: 10/26/2026
One-way
Basic
From
$89
Seen: 9 hrs ago
St. Louis (STL)to
Denver (DEN)
Depart: 12/03/2026
One-way
Basic
From
$89
Seen: 13 hrs ago
St. Louis (STL)to
Denver (DEN)
Depart: 11/03/2026
One-way
Basic
From
$89
Seen: 3 hrs ago
Explore flights from St. Louis to Denver
location_on
location_on
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