฿5,155 Cheap Flights from St. Louis (STL) to Denver (DEN)

View ฿5,155 flight on Wed, 10 Sept 2025Opens in a new window

Popular airlines from Lambert-St. Louis International Airport (STL) to Denver International Airport (DEN)

  • Plan, book, fly with confidence

  • trending down icon

    Be in the know

    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon

    Book smarter

    Save up to 40% on select hotels after you book a flight*
  • payments icon

    Earn twice

    Earn your airline miles on top of our rewards
    Sign in

Cheap Flights from St. Louis (STL) to Denver (DEN)

Prices were available within the past 7 days and start at ฿5,155 for one-way flights and ฿10,470 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Wed, 10 Sept - Wed, 17 Sept
STL
St. Louis
DEN
Denver
฿10,470 Return, found 3 days ago
฿10,470
Return
found 3 days ago
Select Delta flight, departing Wed, 10 Sept from St. Louis to Denver, returning Wed, 17 Sept, priced at ฿10,470 found 3 days ago
Delta
Wed, 10 Sept - Wed, 17 Sept
STL
St. Louis
DEN
Denver
฿10,790 Return, found 3 days ago
฿10,790
Return
found 3 days ago
Select Delta flight, departing Wed, 10 Sept from St. Louis to Denver, returning Wed, 17 Sept, priced at ฿10,790 found 3 days ago
Delta
Wed, 10 Sept - Wed, 17 Sept
STL
St. Louis
DEN
Denver
฿10,800 Return, found 3 days ago
฿10,800
Return
found 3 days ago
Select Delta flight, departing Wed, 10 Sept from St. Louis to Denver, returning Wed, 17 Sept, priced at ฿10,800 found 3 days ago
United
Wed, 10 Sept - Wed, 17 Sept
STL
St. Louis
DEN
Denver
฿11,290 Return, found 3 days ago
฿11,290
Return
found 3 days ago
Select United flight, departing Wed, 10 Sept from St. Louis to Denver, returning Wed, 17 Sept, priced at ฿11,290 found 3 days ago
American Airlines
Wed, 10 Sept - Wed, 17 Sept
STL
St. Louis
DEN
Denver
฿11,600 Return, found 3 days ago
฿11,600
Return
found 3 days ago
Select American Airlines flight, departing Wed, 10 Sept from St. Louis to Denver, returning Wed, 17 Sept, priced at ฿11,600 found 3 days ago
United
Wed, 10 Sept - Wed, 17 Sept
STL
St. Louis
DEN
Denver
฿11,610 Return, found 3 days ago
฿11,610
Return
found 3 days ago
Select United flight, departing Wed, 10 Sept from St. Louis to Denver, returning Wed, 17 Sept, priced at ฿11,610 found 3 days ago
United
Wed, 10 Sept - Wed, 17 Sept
STL
St. Louis
DEN
Denver
฿11,620 Return, found 3 days ago
฿11,620
Return
found 3 days ago
Select United flight, departing Wed, 10 Sept from St. Louis to Denver, returning Wed, 17 Sept, priced at ฿11,620 found 3 days ago
Delta
Wed, 10 Sept - Wed, 17 Sept
STL
St. Louis
DEN
Denver
฿11,770 Return, found 3 days ago
฿11,770
Return
found 3 days ago
Select Delta flight, departing Wed, 10 Sept from St. Louis to Denver, returning Wed, 17 Sept, priced at ฿11,770 found 3 days ago
United
Wed, 10 Sept - Wed, 17 Sept
STL
St. Louis
DEN
Denver
฿11,935 Return, found 3 days ago
฿11,935
Return
found 3 days ago
Select United flight, departing Wed, 10 Sept from St. Louis to Denver, returning Wed, 17 Sept, priced at ฿11,935 found 3 days ago
Delta
Wed, 10 Sept - Wed, 17 Sept
STL
St. Louis
DEN
Denver
฿11,940 Return, found 3 days ago
฿11,940
Return
found 3 days ago
Select Delta flight, departing Wed, 10 Sept from St. Louis to Denver, returning Wed, 17 Sept, priced at ฿11,940 found 3 days ago

Find the cheapest month to fly from St. Louis (STL) to Denver (DEN)

February is typically the cheapest month to fly

From ฿1,938 - ฿10,237 per traveller.
Flight from St. Louis to Denver route information
Origin airport
Lambert-St. Louis Intl.
Destination airport
Denver Intl.
Return price
฿10,470
Distance
1228 km
Average flight time
1 hour 17 mins

Perfect flights from St. Louis to Denver

Embark on an unforgettable journey without breaking the bank with Expedia's incredible deals on cheap flights from St. Louis to Denver. Whether you're aching for a romantic escape with your partner, craving an adventurous solo expedition, or yearning to immerse yourself in the local history and culture, we've got you covered.
 
Picture yourself strolling through the streets of Denver, surrounded by breathtaking architecture and absorbing the vibrant atmosphere of this captivating city. Indulge in the mouth-watering local specialties, from tantalizing street food to exquisite fine dining. With Expedia, you can experience all of this and more, without sacrificing your budget.
 
Our flexible Lambert-St. Louis Intl. to Denver Intl. ticket options cater to your travel preferences, with incredible one-way fares from ฿5,155 and roundtrip prices from ฿10,470. Whether you're planning a short city break or a longer adventure, our dynamic pricing ensures that you find the best deals for your journey.
 
But the magic doesn't stop there. Expedia offers a range of partner services to enhance your trip. Rent a car at Denver Intl. and explore Denver and its surrounding areas at your own pace. Discover hidden gems off the beaten path, and create unforgettable memories. We also provide a handpicked selection of accommodations, from charming bed and breakfasts to luxury hotels, ensuring that you have a comfortable and memorable stay.
 
Planning your next great adventure is a breeze with Expedia. Our user-friendly platform, unbeatable prices, and round-the-clock customer support are designed to make your travel experience seamless and stress-free. So, why wait? Book your STL to DEN travel arrangements today and embark on the journey of a lifetime in Denver.

Frequently asked questions

How much is a flight from St. Louis Lambert International Airport to DIA airport?
Pack your bags, because round-trip flights from Lambert Field to DIA airport start from ฿10,470. That's based on fares advertised within the last 7 days on Expedia for flights departing within the next year. Prices can change quickly, so book now to nab the best deal. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from St. Louis Lambert International Airport to Denver Intl. Airport (DEN)?
Every air carrier has its own terms and conditions. If you do decide to cancel, follow the simple instructions on our Customer Service Portal.
How do I find cheap flights from Lambert Field to DIA airport that have flexible change policies?
Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for St. Louis Lambert International Airport to DIA airport flights, you'll see a "no change fees" filter for you to select.
How far is the flight from Lambert Field to Denver Intl. Airport (DEN)?
That new movie you've been eager to see will have to wait — the flight distance between Lambert Field and Denver Airport is only 1,250 kilometres. The captain will be instructing you to put your seat upright for landing before you know it.
Which airlines fly direct from STL to DEN?
Southwest Airlines (WN) is one of the top choices for many travellers flying between Lambert Field and DEN. Select from the 178 flights it operates on this route each month. You could also take a look at fares with United Airlines (UA). This carrier operates 121 flights a month between St. Louis and Denver.
Are St. Louis Lambert International Airport to Denver Airport flight tickets cheaper when they're purchased at the last minute?
Last-minute bookings from St. Louis Lambert International Airport to Denver Airport can be hit-or-miss. It is possible to find a bargain, but then again, you could miss out entirely! If you'd prefer to play it safe and start your trip planning early on, Expedia compares flight deals up to 12 months in advance. Just keep in mind that not all airlines release their prices so far in advance. Our top tip? Check back often as prices are updated frequently.

Explore a world of travel with Expedia

*Available to Expedia members.