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St. Louis

$35+ Cheap flights from Colorado to St. Louis (STL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/5. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — STL
Nov 21 — Nov 281
Fri 11/21
Fri 11/28
1 adult, Economy
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Find flight deals from Colorado to St. Louis

Cheapest flights from Colorado to St. Louis
Explore the most affordable flight options available from Colorado to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 22, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 10/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/86:00 amDEN - STL
Nonstop2h 07mFrontier
Mon 11/109:07 pmSTL - DEN
1 stop23h 58mFrontier
Deal found 10/20$99
This Cheapflightsfares deal was found by Cheapflights users on 10/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/76:00 amDEN - STL
Nonstop2h 07mFrontier
Mon 11/107:45 pmSTL - DEN
Nonstop2h 28mFrontier
Deal found 10/20$102
This Cheapflightsfares deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/2512:59 amDEN - STL
1 stop8h 38mFrontier
Tue 10/288:40 pmSTL - DEN
Nonstop2h 30mFrontier
Deal found 10/19$106
This Priceline deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/186:00 amDEN - STL
Nonstop2h 07mFrontier
Sat 11/227:43 pmSTL - DEN
Nonstop2h 34mFrontier
Deal found 10/19$107
This Priceline deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/57:05 amDEN - STL
Nonstop2h 09mFrontier
Mon 12/812:07 pmSTL - DEN
1 stop7h 01mFrontier
Deal found 10/21$108
This Cheapflightsfares deal was found by Cheapflights users on 10/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/16:00 amDEN - STL
Nonstop2h 07mFrontier
Mon 11/32:42 pmSTL - DEN
1 stop14h 17mFrontier
Deal found 10/20$109
This Priceline deal was found by Cheapflights users on 10/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/18:00 amDEN - STL
1 stop6h 56mFrontier
Tue 11/47:45 pmSTL - DEN
Nonstop2h 28mFrontier
Deal found 10/20$111
This Kiwi.com deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/306:00 amDEN - STL
Nonstop2h 07mFrontier
Mon 11/37:45 pmSTL - DEN
Nonstop2h 28mFrontier
Deal found 10/21$113
This Frontier deal was found by Cheapflights users on 10/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/306:00 amDEN - STL
Nonstop2h 07mFrontier
Thu 11/67:45 pmSTL - DEN
Nonstop2h 28mFrontier
Deal found 10/20$114
This Kiwi.com deal was found by Cheapflights users on 10/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/249:05 amDEN - STL
1 stop7h 42mFrontier
Tue 10/288:40 pmSTL - DEN
Nonstop2h 30mFrontier
Deal found 10/20$117
This Southwest deal was found by Cheapflights users on 10/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/412:00 pmMTJ - STL
1 stop5h 55mSouthwest
Sat 12/65:30 amSTL - MTJ
1 stop6h 00mSouthwest
Deal found 10/20$193
This American Airlines deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/95:29 amDRO - STL
1 stop6h 03mAmerican Airlines
Sat 12/133:59 pmSTL - DRO
1 stop6h 31mAmerican Airlines
Deal found 10/22$200

Cheap flight deals from Colorado to St. Louis

Keep the following information in mind while searching for Colorado to St. Louis flight deals. Data was last updated October 22, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$99
(Cheapflightsfares)

One-way from

$35
(Priceline)

Popular in

June

Cheapest in

January

Average price

$216

Good round-trip deal

$195 or less

Good one-way deal

$93 or less
Provider with most accurate pricing for Denver Intl-Lambert-St Louis flight deals.
Search Deals
Provider most trusted by Cheapflights users for Denver Intl-Lambert-St Louis flights.
Search Deals
From Colorado to Lambert-St Louis
Search Deals
One-way flight from Colorado to Lambert-St Louis
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($29 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals
Price to beat on a round-trip flight from Colorado to Lambert-St Louis.
Search Deals
Price to beat on a one-way flight from Colorado to Lambert-St Louis.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Colorado to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated October 22, 2025.
Use the filters below to find and compare flights from Colorado to St. Louis that are best for you.

Fly from

Colorado

Fly to

St. Louis

Route

Depart

Return

Price

MontroseSt. Louis

MTJ - STL

MTJSTL

Montrose County

Thu 12/4

12:00 pm-6:55 pm

1 stop5h 55m

Lambert-St Louis

Sat 12/6

5:30 am-10:30 am

1 stop6h 00m

$193

DurangoSt. Louis

DRO - STL

DROSTL

Durango La Plata County

Tue 12/9

5:29 am-12:32 pm

1 stop6h 03m

Lambert-St Louis

Sat 12/13

3:59 pm-9:30 pm

1 stop6h 31m

$200

Colorado SpringsSt. Louis

COS - STL

COSSTL

Colorado Springs

Thu 1/8

7:00 am-1:16 pm

1 stop5h 16m

Lambert-St Louis

Sun 1/11

8:45 am-12:22 pm

1 stop4h 37m

$201

MontroseSt. Louis

MTJ - STL

MTJSTL

Montrose County

Thu 12/4

1:35 pm-8:57 pm

1 stop6h 22m

Lambert-St Louis

Mon 12/8

4:37 pm-8:10 pm

1 stop4h 33m

$211

HaydenSt. Louis

HDN - STL

HDNSTL

Hayden Yampa Valley

Tue 3/10

1:53 pm-8:39 pm

1 stop5h 46m

Lambert-St Louis

Wed 3/11

8:50 am-2:16 pm

1 stop6h 26m

$217

MontroseSt. Louis

MTJ - STL

MTJSTL

Montrose County

Thu 12/4

12:00 pm-9:00 pm

2 stops8h 00m

Lambert-St Louis

Mon 12/8

7:40 am-11:20 am

1 stop4h 40m

$220

Grand JunctionSt. Louis

GJT - STL

GJTSTL

Grand Junction Regnl

Tue 11/4

3:21 pm-9:54 pm

1 stop5h 33m

Lambert-St Louis

Sat 11/8

9:00 am-12:32 pm

1 stop4h 32m

$239

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Wed 1/7

9:50 am-4:50 pm

2 stops6h 00m

Lambert-St Louis

Wed 1/14

10:15 am-3:30 pm

2 stops6h 15m

$239

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Sat 11/15

9:40 am-5:00 pm

1 stop6h 20m

Lambert-St Louis

Tue 11/18

10:35 am-3:35 pm

2 stops6h 00m

$242

AspenSt. Louis

ASE - STL

ASESTL

Aspen Pitkin County

Fri 11/14

3:34 pm-9:54 pm

1 stop5h 20m

Lambert-St Louis

Sun 11/16

9:00 am-12:29 pm

1 stop4h 29m

$249

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/21

Showing 1-10 of 60 results
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Best time to book a flight from Colorado to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Colorado with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Colorado to St. Louis

What is the cheapest month to book a flight from Colorado to St. Louis?

Currently, February is the cheapest month in which you can book a flight from Colorado to St. Louis (average of $37). Flying from Colorado to St. Louis in July is currently the most expensive (average of $126). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from CO to STL?

Find hourly flight availability from Colorado to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 22, 2025.

It’s optimal to fly from Colorado to St. Louis in the evening. By choosing this option you can save up to 49% on the cost of your flight, compared to a flight in the morning.

What is the cheapest day to fly from Colorado to St. Louis?

Use this chart to determine the cheapest time to fly round-trip from Colorado to St. Louis. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Colorado to St. Louis flight should consider departing on Wednesday evenings when fares are most often at their lowest. Monday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Related info for your journey

Find useful and relevant information for your journey from Colorado to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to St. Louis from Colorado?

    For a flight from Colorado to St. Louis, you will be flying into Lambert-St Louis. Lambert-St Louis (STL) is just 12.7 mi from the center of the city.

  • How popular is this Colorado to St. Louis flight route?

    This flight path from Colorado to Lambert-St Louis was viewed by 37 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from Colorado to St. Louis?

    Departing from Colorado to St. Louis will take you 5h 16m. Colorado and St. Louis are separated by a distance of 771 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Colorado to St. Louis one-way?

    The cheapest airlines for a one-way flight from Colorado to St. Louis are Frontier ($56), United Airlines ($73), and Delta ($109).

  • What are the most popular routes from Colorado to St. Louis?

    When deciding which route to take from Colorado to St. Louis consider Denver Intl - Lambert-St Louis, Durango La Plata County - Lambert-St Louis or Montrose County - Lambert-St Louis as they are the most popular.

  • What are the most reliable airlines from Colorado to St. Louis?

    The top 3 most reliable airlines when flying from Colorado to St. Louis are Frontier (93%), SkyWest Airlines (91%) and United Airlines (89%).

  • What are the cheapest flights from Colorado to St. Louis?

    Looking for the cheapest flight from Colorado to St. Louis? While on average our users pay $215, our data indicates the cheapest price to be $27. The most popular route (Denver Intl - Lambert-St Louis), is priced around $118.

  • Can I find deals for flights from Colorado to St. Louis that include hotel bookings?

    Yes. In addition to deals on Colorado to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Colorado to St. Louis?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Colorado to St. Louis.

  • Can I find deals for business class flights from Colorado to St. Louis?

    Yes. Cheapflights offers flight deals from Colorado to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Colorado to St. Louis?

    Currently, February is the cheapest month in which you can book a flight from Colorado to St. Louis (average of $37). Flying from Colorado to St. Louis in July is currently the most expensive (average of $126). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Edwardsville
O'Fallon
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
St. Peters
Chesterfield
Alton
Farmington
Festus

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Alternative routes for Colorado to St. Louis

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Top 4 airlines flying from Colorado to St. Louis

Discover the top 4 airlines that operate flights from Colorado to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated October 22, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$56Average$158FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$155Average$404FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$177Average$343FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$227Average$380FlexibilityNo cancel feeOn-time71%

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