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Flights from Denver (DEN) to St. Louis (STL)
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!
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During the ongoing COVID-19 pandemic, the availability, health and safety procedures, operations, and schedules for local attractions are changing constantly. Please contact attractions directly for hours of operation, potential temperature screenings, and other possible health and safety procedures and restrictions. Visit our COVID-19 Travel Information page for information about potential restrictions on air travel.
Flight details
Departing from: Denver International Airport (DEN)
Arriving at: Lambert-St. Louis International Airport (STL)
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.
Travel tips
Infancy policy
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.
Pet policy
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.
Unaccompanied minor
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.
Bags fly free®1
Start packing! Every ticketed Customer’s first two checked bags are free. Learn more.
The Southwest travel experience
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. Looking for tours, activities, and more hidden gems to add to your St. Louis adventure? Explore getaways with Southwest®. 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.
Questions we hear the most
To find the cheapest day and time to fly Denver to St. Louis with Southwest, check out our Low Fare Calendar.
