Fly east to the Gateway to the West when you travel from Denver to St. Louis with Southwest Airlines®! Southwest® has flights from Denver International Airport to Lambert-St. Louis International Airport that that will take you on a trip of a lifetime. Find your flight to St. Louis with Southwest and book with confidence. If your upcoming excursion has flexible dates, search for flights with our Low Fare Calendar and discover the lowest fares we’ve got. Don't forget to explore Southwest Vacations® to find package deals on flights, hotels, rental cars, and more.
Check out Denver to St. Louis flights and book yours now!
Denver, CO to St. Louis, MO
departing on 4/20
one-way starting at*$109
*Restrictions and exclusions apply. Seats and dates are limited. Select markets. 21 travel days available.
|Departing from||Denver International Airport (DEN)|
|Arriving at||Lambert-St. Louis International Airport (STL)|
|Average flight time||1 hour 57 minutes|
|6‡||Nonstop flights per day Monday through Friday|
|3‡||Nonstop flights on Saturday|
|6‡||Nonstop flights on Sunday|
Other popular flights from Denver:View our interactive map
†Weekly flights based on DOT published scheduled average flights Monday through Sunday between 4/1/2023 and 4/30/2023. Note: route may not operate every day of the week.
‡Nonstop flights based on DOT published scheduled average flights Monday through Sunday between 4/1/2023 and 4/30/2023.
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.
One child over 14 days and under two (2) years of age, not occupying a seat, may be carried free of charge when traveling with an adult (12 years of age or older). Learn more.
Customers flying with a pet are subject to a pet fare. To learn more about traveling with your furry friend, explore the Southwest® pet policy.
Minors under the age of 18 are not permitted to fly unaccompanied on international flights or any itinerary that includes an international flight. Learn more.
Lambert-St. Louis International Airport will bring you within 14 miles of downtown St. Louis. Hop on a bus, or train, or call a car to get on your way.
At Southwest, we know it takes more than great deals on St. Louis airfares and convenient scheduling options to make your trip memorable. So from booking to boarding, we offer services and features designed to make your travel from Denver to St. Louis the best it can be. Learn more about the Southwest® travel experience before you book your flight from Denver International Airport to Lambert-St. Louis International Airport.
Flying with Southwest is simple and fun, no matter which of our dozens of exciting destinations you choose. When you search for your next flight to St. Louis, know that you won’t be surprised at checkout. Low fares and no hidden fees. That's Transfarency®. And as always, two bags fly free®1. Want the latest news, information, and promotional offers from Southwest? Sign up to receive email from us. Book your flight today and know that you'll earn Rapid Rewards® points when you fly.
1First and second checked bags. Weight and size limits apply.
2Fare difference may apply.
3Failure to cancel a reservation at least 10 minutes prior to departure may result in forfeited Travel Funds.
4Flight credits unexpired on or created on or after July 28, 2022, do not expire and will show an expiration date until our systems are updated. See full details here.
5Where available. Available only on WiFi-enabled aircraft. Limited-time offer.
6Due to licensing restrictions, on WiFi-enabled international flights, free live TV and iHeartRadio may not be available for the full duration of flight.
7Internet 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.