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Cheap flight deals from St. Louis to Denver Starting at $18

Discover our range of affordable one-way and round-trip flights from St. Louis to Denver and kick-start your next adventure today!

  • One way
  • Round-trip
      • Cheapest nonstop
        STL18:46
        2h 36m
        Nonstop
        DEN20:22
        Sat, Dec 7|St. Louis - Denver|Frontier Airlines
        $18$44
        59% OFF
        59% OFF
        $44$18

        Choose Frontier Airlines flights from St. Louis to Denver. The one-way direct flight with Frontier Airlines departs from St.Louis Lambert International Airport on Sat, Dec 7, arriving at Denver International Airport. One-way Prices start from $18 including taxes and charges.

      • STL18:46
        2h 31m
        Nonstop
        DEN20:17
        Sat, Jan 18|St. Louis - Denver|Frontier Airlines
        $26$44
        41% OFF
        41% OFF
        $44$26

        Choose Frontier Airlines flights from St. Louis to Denver. The one-way direct flight with Frontier Airlines departs from St.Louis Lambert International Airport on Sat, Jan 18, arriving at Denver International Airport. One-way Prices start from $26 including taxes and charges.

      • STL21:46
        2h 40m
        Nonstop
        DEN23:26
        Tue, Dec 17|St. Louis - Denver|Frontier Airlines
        $27$44
        39% OFF
        39% OFF
        $44$27

        Choose Frontier Airlines flights from St. Louis to Denver. The one-way direct flight with Frontier Airlines departs from St.Louis Lambert International Airport on Tue, Dec 17, arriving at Denver International Airport. One-way Prices start from $27 including taxes and charges.

      • STL18:46
        2h 36m
        Nonstop
        DEN20:22
        Sat, Dec 14|St. Louis - Denver|Frontier Airlines
        $29
        $29

        Choose Frontier Airlines flights from St. Louis to Denver. The one-way direct flight with Frontier Airlines departs from St.Louis Lambert International Airport on Sat, Dec 14, arriving at Denver International Airport. One-way Prices start from $29 including taxes and charges.

      • STL18:46
        2h 31m
        Nonstop
        DEN20:17
        Sat, Jan 11|St. Louis - Denver|Frontier Airlines
        $31
        $31

        Choose Frontier Airlines flights from St. Louis to Denver. The one-way direct flight with Frontier Airlines departs from St.Louis Lambert International Airport on Sat, Jan 11, arriving at Denver International Airport. One-way Prices start from $31 including taxes and charges.

      • STL18:46
        2h 36m
        Nonstop
        DEN20:22
        Fri, Dec 6|St. Louis - Denver|Frontier Airlines
        $36
        $36

        Choose Frontier Airlines flights from St. Louis to Denver. The one-way direct flight with Frontier Airlines departs from St.Louis Lambert International Airport on Fri, Dec 6, arriving at Denver International Airport. One-way Prices start from $36 including taxes and charges.

      • STL18:46
        2h 36m
        Nonstop
        DEN20:22
        Fri, Dec 13|St. Louis - Denver|Frontier Airlines
        $38
        $38

        Choose Frontier Airlines flights from St. Louis to Denver. The one-way direct flight with Frontier Airlines departs from St.Louis Lambert International Airport on Fri, Dec 13, arriving at Denver International Airport. One-way Prices start from $38 including taxes and charges.

      • STL18:49
        2h 36m
        Nonstop
        DEN20:25
        Fri, Jan 10|St. Louis - Denver|Frontier Airlines
        $38
        $38

        Choose Frontier Airlines flights from St. Louis to Denver. The one-way direct flight with Frontier Airlines departs from St.Louis Lambert International Airport on Fri, Jan 10, arriving at Denver International Airport. One-way Prices start from $38 including taxes and charges.

      • STL18:46
        2h 36m
        Nonstop
        DEN20:22
        Wed, Jan 15|St. Louis - Denver|Frontier Airlines
        $38
        $38

        Choose Frontier Airlines flights from St. Louis to Denver. The one-way direct flight with Frontier Airlines departs from St.Louis Lambert International Airport on Wed, Jan 15, arriving at Denver International Airport. One-way Prices start from $38 including taxes and charges.

      • STL18:46
        2h 36m
        Nonstop
        DEN20:22
        Wed, Dec 11|St. Louis - Denver|Frontier Airlines
        $38
        $38

        Choose Frontier Airlines flights from St. Louis to Denver. The one-way direct flight with Frontier Airlines departs from St.Louis Lambert International Airport on Wed, Dec 11, arriving at Denver International Airport. One-way Prices start from $38 including taxes and charges.

      • STL13:00
        3h 5m
        Nonstop
        DEN14:00
        Mon, Dec 2|St. Louis - Denver|Frontier Airlines
        Find More Flights
        Find More Flights

Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.

When is the cheapest time to fly from St. Louis to Denver?

Price trend charts are a great way of tracking how much your flights cost in the lead up to departure and can help you choose when to book your tickets. See how prices to Denver from St. Louis have changed and are set to move below.

Displayed prices are calculated based on the cheapest average weekly prices of the corresponding route on Trip.com.

Find cheap airlines flights from St. Louis to Denver

Compare prices from various providers below to understand which option best suits your travel needs, before enjoying a comfortable journey with a trusted airline from St. Louis to Denver.

Frontier Airlines
From $18
Delta Air Lines
From $78
American Airlines
From $79
United Airlines
From $84
Southwest Airlines
From $118
Alaska Airlines
From $158

Find more flights and airlines

Alternative Cheap Routes from St. Louis to Denver

Searching for potential routes that might be cheaper and faster? There are a few alternative ways to get to Denver from St. Louis which could help you save money and time.

  • Cheapest
    Frontier Airlines
    STL
    18:46
    2h 36m
    Nonstop
    DEN
    20:22
    St. Louis Lambert International Airport - Denver International Airport
    Sat, Dec 7Frontier Airlines
    $18
  • Frontier Airlines
    STL
    18:46
    2h 36m
    Nonstop
    DEN
    20:22
    St. Louis Lambert International Airport - Denver International Airport
    Sat, Dec 7Frontier Airlines
    $18
    Find More Flights

Frequently Asked Questions

  • When are flight tickets from St. Louis (STL) to Denver (DEN) the cheapest?

    Airlines adjust prices for flights from St. Louis to Denver based on the departure date and time of your selection. By analyzing data from all airlines, we've discovered that on Trip.com, you can find the lowest flight prices on Tuesdays, Wednesdays, and Saturdays.

  • How much do flights from St. Louis (STL) to Denver (DEN) cost?

    According to Trip.com's data, the lowest price is around $206.

  • How long does it take to fly from St. Louis (STL) to Denver (DEN) and what is the distance?

    It takes around 2 hours 53 minutes to fly from St. Louis (STL) to Denver (DEN).

  • What are the most popular airlines that fly from St. Louis (STL) to Denver (DEN)?

    Airlines with flights from St. Louis (STL) to Denver (DEN): Southwest Airlines, United Airlines and Volaris.

How to find a cheap flight from St. Louis to Denver

If you don’t know some of the key things to look out for when buying flight tickets, prices can often end up sky high or, worse, sold out! We’ve carefully compiled our six most important steps to help ensure you’re getting the best deals when planning your next journey.
1
Book Early
Once prices are gone, they're gone. Lock in deals while you can!
2
Compare Flight Prices
Compare prices on travel agency and airline websites.
3
Look Out for Deals
Check airline and travel agency websites for latest flight deals
4
Check One-way Fares
Buying two cheap one-way flights can sometimes be a better deal than a round-trip.
5
Try Different Dates
Flying during the week, early in the morning, or late at night can help save money.
6
Use the Trip.com App
Save up to £10 per person when booking your flights on Trip.com

Flight Info | St. Louis to Denver

Cheapest nonstop flight price$18
Cheapest round-trip ticket price$46
Off-season for travelDecember
Peak season for travelAugust
Flight distance1,253.6 km
Average flight time2 hours 53 minutes
Popular airlineAmerican Airlines

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