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Low Price Flights from St. Louis to Denver
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Cheap Flight Deals from St. Louis to Denver

Whether you’re going for a one-way or round-trip to Denver, we’ve got you covered! Check out these different flight options from St. Louis below.

  • One way
  • Return
      • Cheapest nonstop
        STL18:46
        2h 36m
        Nonstop
        DEN20:22
        Sat, Jan 11|St. Louis - Denver|Frontier Airlines
        NZD 33NZD 77
        57% OFF
        57% OFF
        NZD 77NZD 33

        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 NZD 33 including taxes and charges.

      • STL19:09
        2h 28m
        Nonstop
        DEN20:37
        Sat, Jan 25|St. Louis - Denver|Frontier Airlines
        NZD 44NZD 77
        43% OFF
        43% OFF
        NZD 77NZD 44

        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 25, arriving at Denver International Airport. One-way Prices start from NZD 44 including taxes and charges.

      • STL19:09
        2h 28m
        Nonstop
        DEN20:37
        Wed, Jan 22|St. Louis - Denver|Frontier Airlines
        NZD 48NZD 77
        38% OFF
        38% OFF
        NZD 77NZD 48

        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 22, arriving at Denver International Airport. One-way Prices start from NZD 48 including taxes and charges.

      • STL18:54
        2h 31m
        Nonstop
        DEN20:25
        Wed, Feb 26|St. Louis - Denver|Frontier Airlines
        NZD 48
        NZD 48

        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, Feb 26, arriving at Denver International Airport. One-way Prices start from NZD 48 including taxes and charges.

      • STL19:09
        2h 28m
        Nonstop
        DEN20:37
        Wed, Jan 29|St. Louis - Denver|Frontier Airlines
        NZD 48
        NZD 48

        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 29, arriving at Denver International Airport. One-way Prices start from NZD 48 including taxes and charges.

      • STL19:09
        2h 28m
        Nonstop
        DEN20:37
        Sat, Feb 1|St. Louis - Denver|Frontier Airlines
        NZD 48
        NZD 48

        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, Feb 1, arriving at Denver International Airport. One-way Prices start from NZD 48 including taxes and charges.

      • STL19:09
        2h 28m
        Nonstop
        DEN20:37
        Sat, Jan 18|St. Louis - Denver|Frontier Airlines
        NZD 48
        NZD 48

        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 NZD 48 including taxes and charges.

      • STL19:09
        2h 28m
        Nonstop
        DEN20:37
        Sat, Feb 8|St. Louis - Denver|Frontier Airlines
        NZD 48
        NZD 48

        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, Feb 8, arriving at Denver International Airport. One-way Prices start from NZD 48 including taxes and charges.

      • STL18:46
        2h 36m
        Nonstop
        DEN20:22
        Wed, Jan 15|St. Louis - Denver|Frontier Airlines
        NZD 49
        NZD 49

        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 NZD 49 including taxes and charges.

      • STL19:09
        2h 28m
        Nonstop
        DEN20:37
        Wed, Feb 5|St. Louis - Denver|Frontier Airlines
        NZD 49
        NZD 49

        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, Feb 5, arriving at Denver International Airport. One-way Prices start from NZD 49 including taxes and charges.

      • STL01:00 pm
        3h 5m
        Nonstop
        DEN02:00 pm
        Tue, Jan 14|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.

Best Time to Book Flights 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.

Top Airlines Flying from St. Louis to Denver

Which airline provides the cheapest flights from St. Louis to Denver? Discover the option that best suits your travel needs before embarking on your journey.

Frontier Airlines
From NZD 33
Southwest Airlines
From NZD 141
Delta Air Lines
From NZD 151
American Airlines
From NZD 170
United Airlines
From NZD 175
Alaska Airlines
From NZD 315

Find more flights and airlines

Alternative Routes from St. Louis to Denver

There are various non-direct routes from St. Louis to Denver which could be cheaper and faster! Check out these alternative options to see if they could work for your trip.

  • Cheapest
    Frontier Airlines
    STL
    18:46
    2h 36m
    Nonstop
    DEN
    20:22
    St. Louis Lambert International Airport - Denver International Airport
    Sat, Jan 11Frontier Airlines
    NZD 33
  • Frontier Airlines
    STL
    18:46
    2h 36m
    Nonstop
    DEN
    20:22
    St. Louis Lambert International Airport - Denver International Airport
    Sat, Jan 11Frontier Airlines
    NZD 33
    Find More Flights

FAQ

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

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

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

    According to Trip.com's data, the lowest price is around NZD 360.

  • How long is the flights from St. Louis (STL) to Denver (DEN)?

    It takes about 2 hours 38 minutes to fly from St. Louis (STL) to Denver (DEN).

  • What time does the earliest flight from St. Louis to Denver depart?

    The earliest flight departs from St. Louis (STL) at 08:40 and arrives in Denver (DEN) at 10:10.

  • 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, Volaris, Air Canada and Frontier Airlines.

  • What's the most popular airline for direct flights from St. Louis (STL) to Denver (DEN)?

    Frontier Airlines operates 1 direct flights from St. Louis (STL) to Denver (DEN).

  • How many airports in Denver (DEN)?

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 Information from St. Louis to Denver

Cheapest direct flight priceNZD 32
Cheapest return ticket priceNZD 82
Off-season for travelJanuary
Peak season for travelApril
Flight distance1,253.6km
Average flight time2 hours 38 minutes
Popular airlineAmerican Airlines

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