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Flights from Denver to St. Louis

Book direct flights from Denver to St. Louis: One way flights from $51, round trip flights from $99. Find flight deals for the next 3 months below.

      • Cheapest nonstop
        DEN 4:10 PM
        2h 13m
        Nonstop
        STL 7:23 PM
        Denver - St. Louis | Sat, Aug 8 | Frontier Airlines
        STL 8:08 PM
        2h 36m
        Nonstop
        DEN 9:44 PM
        St. Louis - Denver | Wed, Aug 12 | Frontier Airlines
        $99 $173
        43% off
        43% off
        $173 $99
      • DEN 4:10 PM
        2h 13m
        Nonstop
        STL 7:23 PM
        Denver - St. Louis | Thu, Aug 13 | Frontier Airlines
        STL 8:08 PM
        2h 36m
        Nonstop
        DEN 9:44 PM
        St. Louis - Denver | Sat, Aug 15 | Frontier Airlines
        $101 $173
        42% off
        42% off
        $173 $101
      • DEN 4:00 PM
        2h 13m
        Nonstop
        STL 7:13 PM
        Denver - St. Louis | Sat, Aug 29 | Frontier Airlines
        STL 7:58 PM
        2h 27m
        Nonstop
        DEN 9:25 PM
        St. Louis - Denver | Wed, Sep 2 | Frontier Airlines
        $101 $173
        42% off
        42% off
        $173 $101
      • DEN 4:12 PM
        2h 3m
        Nonstop
        STL 7:15 PM
        Denver - St. Louis | Sat, Sep 12 | Frontier Airlines
        STL 8:10 PM
        2h 39m
        Nonstop
        DEN 9:49 PM
        St. Louis - Denver | Wed, Sep 16 | Frontier Airlines
        $101
        42% off
        $173 $101
      • DEN 4:10 PM
        2h 13m
        Nonstop
        STL 7:23 PM
        Denver - St. Louis | Fri, Aug 14 | Frontier Airlines
        STL 8:08 PM
        2h 36m
        Nonstop
        DEN 9:44 PM
        St. Louis - Denver | Mon, Aug 17 | Frontier Airlines
        $113
        35% off
        $173 $113
      • DEN 4:10 PM
        2h 13m
        Nonstop
        STL 7:23 PM
        Denver - St. Louis | Fri, Jul 24 | Frontier Airlines
        STL 8:08 PM
        2h 36m
        Nonstop
        DEN 9:44 PM
        St. Louis - Denver | Thu, Jul 30 | Frontier Airlines
        $114
        34% off
        $173 $114
      • DEN 4:10 PM
        2h 13m
        Nonstop
        STL 7:23 PM
        Denver - St. Louis | Thu, Jul 30 | Frontier Airlines
        STL 8:08 PM
        2h 36m
        Nonstop
        DEN 9:44 PM
        St. Louis - Denver | Fri, Aug 7 | Frontier Airlines
        $116
        33% off
        $173 $116
      • DEN 4:10 PM
        2h 13m
        Nonstop
        STL 7:23 PM
        Denver - St. Louis | Wed, Aug 12 | Frontier Airlines
        STL 8:08 PM
        2h 36m
        Nonstop
        DEN 9:44 PM
        St. Louis - Denver | Fri, Aug 14 | Frontier Airlines
        $116
        33% off
        $173 $116
      • DEN 4:00 PM
        2h 13m
        Nonstop
        STL 7:13 PM
        Denver - St. Louis | Sat, Sep 5 | Frontier Airlines
        STL 7:58 PM
        2h 27m
        Nonstop
        DEN 9:25 PM
        St. Louis - Denver | Wed, Sep 9 | Frontier Airlines
        $117
        32% off
        $173 $117
      • DEN 4:10 PM
        2h 13m
        Nonstop
        STL 7:23 PM
        Denver - St. Louis | Mon, Aug 3 | Frontier Airlines
        STL 8:08 PM
        2h 36m
        Nonstop
        DEN 9:44 PM
        St. Louis - Denver | Fri, Aug 7 | Frontier Airlines
        $121
        30% off
        $173 $121
      • DEN 1:00 PM
        17h 25m
        1 stop
        STL 2:00 PM
        Denver - St. Louis | Tue, Jul 21 | Normal Airline
        STL 3:00 PM
        6h
        Nonstop
        DEN 4:00 PM
        St. Louis - Denver | Thu, Jul 23 | Normal Airline
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      • Cheapest nonstop
        DEN 4:10 PM
        2h 13m
        Nonstop
        STL 7:23 PM
        Denver - St. Louis | Thu, Aug 6 | Frontier Airlines
        $51 $148
        66% off
        66% off
        $148 $51
      • DEN 4:10 PM
        2h 13m
        Nonstop
        STL 7:23 PM
        Denver - St. Louis | Wed, Jul 29 | Frontier Airlines
        $60 $148
        59% off
        59% off
        $148 $60
      • DEN 4:10 PM
        2h 13m
        Nonstop
        STL 7:23 PM
        Denver - St. Louis | Wed, Jul 22 | Frontier Airlines
        $68 $148
        54% off
        54% off
        $148 $68
      • DEN 4:10 PM
        2h 13m
        Nonstop
        STL 7:23 PM
        Denver - St. Louis | Mon, Aug 10 | Frontier Airlines
        $73
        51% off
        $148 $73
      • DEN 5:32 PM
        2h 6m
        Nonstop
        STL 8:38 PM
        Denver - St. Louis | Wed, Sep 9 | United Airlines
        $94
        36% off
        $148 $94
      • DEN 12:59 AM
        7h 38m
        1 stop
        STL 9:37 AM
        Denver - St. Louis | Thu, Aug 6 | Delta Air Lines
        $98
        34% off
        $148 $98
      • DEN 1:00 PM
        17h 25m
        1 stop
        STL 2:00 PM
        Denver - St. Louis | Tue, Jul 21 | Normal Airline
        Find more flights
        Find more flights

Find cheap airlines flights from Denver to St. Louis

You can choose from 1 airlines that fly from Denver to St. Louis, including Frontier Airlines, Frontier Airlines has lowest fares on this route.
Frontier Airlines logo Frontier Airlines
Airlines are determined based on actual purchased flight tickets from Denver to St. Louis according to previous 12 months data from Trip.com.

Flight Info | Denver to St. Louis

The distance between Denver and St. Louis is approximately 1,253.6 km. It takes around 2 hours 7 minutes on average to fly from Denver to St. Louis. Based on Trip.com's data travel demand peaks in July. The off-season for travel is November.

Cheapest one-way flight price$51
Cheapest round-trip ticket price$99
Off-season for travelNovember
Peak season for travelJuly
Flight distance1,253.6 km
Average flight time2 hours 7 minutes
Popular airlineFrontier Airlines
Flight statistics for the Denver–St. Louis route are based on aggregated booking data from Trip.com over the past 12 months.

Trip.com price insights on flights from Denver to St. Louis

Which month has the cheapest one-way flights from Denver to St. Louis?

The average price of one-way flights from Denver to St. Louis purchased by Trip.com users by month over the past 12 months.

Based on Trip.com’s data, the cheapest month for flights from Denver to St. Louis is October, with an average price of $45; while the month with the highest flight price is usually November, with an average price of up to $349.

$349
$197
$45
0
    Cheapest
  • $116
    Jul
  • $167
    Aug
  • $129
    Sep
  • $45
    Oct
  • $349
    Nov
  • $111
    Dec
  • $79
    Jan
  • $46
    Feb
  • $69
    Mar
  • $251
    Apr
  • $79
    May
  • $133
    Jun

Frequently Asked Questions

  • What are the cheapest flights from Denver to St. Louis (DEN-STL)?

    Based on Trip.com data, Frontier Airlines offers one-way fares as low as $51 on Cheapest nonstop routes (e.g. DEN to STL on Thu, Aug 6), while Frontier Airlines offers Cheapest nonstop round-trips from $99 departing on Sat, Aug 8 and returning on Wed, Aug 12.
  • At the moment, you can catch a nonstop flight from Denver to St. Louis with the following airlines, including: Frontier Airlines Selected airlines are based on historical data collected from flight bookings users made on Trip.com within the last 90 days.
  • It takes around 2 hours 7 minutes to fly from Denver (DEN) to St. Louis (STL).
  • By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Denver to St. Louis is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.
  • Based on Trip.com data in the past 4 weeks, there is 80 flight per week flying from Denver to St. Louis. You can check the weekly schedule for popular airlines on this route below: Frontier Airlines: S/M/T/W/T/F/S -- F93302 (16:29)
  • To find best deals on flights from Denver to St. Louis, you can use various tools on Trip.com:
    · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Thu, Aug 6, with one-way flights priced at just $51.
    · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Frontier Airlines.
    · Set up price alerts to easily monitor ticket prices without having to check every day.
    · Check Trip.com flight deals and promo codes frequently.
    · Avoid peak season unless you book very early. It seems the peak season for St. Louis travel is around July.
    · Get exclusive promo codes for Trip.com app users.
  • The cheapest months to fly from Denver to St. Louis is November, when demand for travel is lower.
  • After crunching the numbers on our July flight calendar, it's currently cheapest to fly from Denver to St. Louis on July 22, 2026 with Frontier Airlines, with prices starting at $114.
  • You can land at any one of the following hubs in St. Louis, with Denver International Airport to St. Louis Lambert International Airport (DEN-STL) is by far the most common option on this route: St. Louis Lambert International Airport (STL) St. Louis Downtown Airport (CPS).
  • The time difference between St. Louis and Denver is 1h.
  • Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.

Explore More Popular Flights

Note: Prices shown on this page are estimated lowest price and include all taxes and fees found in the last 24 hours.

Book with no extra fees

Prices displayed in this page are all-inclusive prices (incl. taxes, fuel surcharge, civil aviation development fund, etc) with all fees confirmed before payment. Fees for luggage, meals, WLAN, or other additional services are also included as shown in the flight cards.

Real-time pricing updates

Prices, availability, and travel information on this page were updated within last 24 hours—even in real-time. The more popular the route, the more precise the data.

Change & Cancellation Policy

Trip.com displays flight cancellation and change policies for each flight ticket during the booking process, including fees and applicable conditions. Please check the following scenarios:
Voluntary cancellation/change:
To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy.
Cancellation/change due to a flight schedule change:
If the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.