App
Customer Support
AUD
Find Bookings
Trip.com
>
Flights
>
Flights to United States
>
Cheap Flights to Denver
>
Low Price Flights from St. Louis to Denver
Worldwide Coverage
Worldwide Coverage
Flights to over 5,000 cities
One-stop Service Guarantee
One-stop Service Guarantee
Price guaranteed upon confirmed payment, booking guaranteed once tickets issued
Secure Payment
Secure Payment
Convenient & reliable booking and payment system

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
        STL19:04
        2h 28m
        Nonstop
        DEN20:32
        Sat, Mar 1|St. Louis - Denver|Frontier Airlines
        AU$ 27AU$ 138
        80% OFF
        80% OFF
        AU$ 138AU$ 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 Sat, Mar 1, arriving at Denver International Airport. One-way Prices start from AU$ 27 including taxes and charges.

      • STL19:04
        2h 28m
        Nonstop
        DEN20:32
        Sat, Feb 15|St. Louis - Denver|Frontier Airlines
        AU$ 44AU$ 138
        68% OFF
        68% OFF
        AU$ 138AU$ 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, Feb 15, arriving at Denver International Airport. One-way Prices start from AU$ 44 including taxes and charges.

      • STL19:04
        2h 28m
        Nonstop
        DEN20:32
        Wed, Mar 5|St. Louis - Denver|Frontier Airlines
        AU$ 44AU$ 138
        68% OFF
        68% OFF
        AU$ 138AU$ 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 Wed, Mar 5, arriving at Denver International Airport. One-way Prices start from AU$ 44 including taxes and charges.

      • STL18:51
        2h 31m
        Nonstop
        DEN20:22
        Wed, Apr 16|St. Louis - Denver|Frontier Airlines
        AU$ 49
        AU$ 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, Apr 16, arriving at Denver International Airport. One-way Prices start from AU$ 49 including taxes and charges.

      • STL18:51
        2h 31m
        Nonstop
        DEN20:22
        Sat, Apr 5|St. Louis - Denver|Frontier Airlines
        AU$ 52
        AU$ 52

        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, Apr 5, arriving at Denver International Airport. One-way Prices start from AU$ 52 including taxes and charges.

      • STL19:03
        2h 28m
        Nonstop
        DEN20:31
        Sat, Mar 29|St. Louis - Denver|Frontier Airlines
        AU$ 53
        AU$ 53

        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, Mar 29, arriving at Denver International Airport. One-way Prices start from AU$ 53 including taxes and charges.

      • STL18:51
        2h 31m
        Nonstop
        DEN20:22
        Wed, Apr 2|St. Louis - Denver|Frontier Airlines
        AU$ 54
        AU$ 54

        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, Apr 2, arriving at Denver International Airport. One-way Prices start from AU$ 54 including taxes and charges.

      • STL18:51
        2h 31m
        Nonstop
        DEN20:22
        Sat, Apr 19|St. Louis - Denver|Frontier Airlines
        AU$ 55
        AU$ 55

        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, Apr 19, arriving at Denver International Airport. One-way Prices start from AU$ 55 including taxes and charges.

      • STL19:04
        2h 28m
        Nonstop
        DEN20:32
        Wed, Feb 19|St. Louis - Denver|Frontier Airlines
        AU$ 64
        AU$ 64

        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 19, arriving at Denver International Airport. One-way Prices start from AU$ 64 including taxes and charges.

      • STL19:04
        2h 28m
        Nonstop
        DEN20:32
        Sat, Mar 8|St. Louis - Denver|Frontier Airlines
        AU$ 88
        AU$ 88

        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, Mar 8, arriving at Denver International Airport. One-way Prices start from AU$ 88 including taxes and charges.

      • STL01:00 pm
        3h 5m
        Nonstop
        DEN02:00 pm
        Tue, Feb 18|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.

St. Louis to Denver Flight Time

Flight info.
Departure
Arrival
Weekly Schedule

  1. F93641

    Frontier Airlines

    13:06

    STL

    3.8h

    14:51

    LAS

    SMTWTF-
    Search

  2. F91994

    Frontier Airlines

    00:59

    LAS

    2.0h

    03:59

    DEN

    SMTWTFS

  3. F92630

    Frontier Airlines

    17:47

    STL

    2.5h

    21:19

    MCO

    S------
    Search

  4. F91733

    Frontier Airlines

    06:00

    MCO

    4.3h

    08:18

    DEN

    SMTWTFS

  5. F94567

    Frontier Airlines

    18:53

    STL

    2.5h

    Nonstop

    20:22

    DEN

    S-T-TF-
    Search

  6. F92017

    Frontier Airlines

    21:55

    STL

    3.8h

    23:41

    LAS

    S--WT-S
    Search

  7. F94968

    Frontier Airlines

    21:59

    LAS

    2.0h

    01:01

    DEN

    SM-WTFS

  8. F92017

    Frontier Airlines

    21:55

    STL

    3.8h

    23:41

    LAS

    S--WT-S
    Search

  9. F92016

    Frontier Airlines

    09:19

    LAS

    2.1h

    12:24

    DEN

    SMTWTFS
Find more flights and airlines

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.

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 AU$ 325.

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

    It takes about 4 hours 32 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 and Volaris.

  • 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)?

    There are 1 airport(s) in Denver (DEN): Denver International Airport.

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 priceAU$ 27
Cheapest return ticket priceAU$ 60
Off-season for travelMarch
Peak season for travelMay
Flight distance1,253.6km
Average flight time3 hours 19 minutes
Popular airlineAmerican Airlines

Contact Us

About

Other Services

Payment Methods
Our Partners
Copyright © 2025 Trip.com Travel Singapore Pte. Ltd. All rights reserved
Site Operator: Trip.com Travel Singapore Pte. Ltd.