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St. Louis

$78+ 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 8/27. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — STL
ago. 26 — sep. 21
mar. 8/26
mar. 9/2
1 adult, Economy
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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 agosto 21, 2025.

Round-trip from

$104
(Priceline)

One-way from

$78
(Cheapflightsfares)

Popular in

June

Cheapest in

January

Average price

$198

Good round-trip deal

$139 or less

Good one-way deal

$113 or less
From Colorado to Lambert-St Louis
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One-way flight from Colorado to Lambert-St Louis
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Highest demand for flights based on searches. 13% potential increase in price ($35 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Price to beat on a round-trip flight from Colorado to Lambert-St Louis.
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Price to beat on a one-way flight from Colorado to Lambert-St Louis.
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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 agosto 21, 2025.

This Priceline deal was found by Cheapflights users on 8/20. 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.
jue. 10/96:00 amDEN - STL
Nonstop2h 07mFrontier
mar. 10/147:52 pmSTL - DEN
Nonstop2h 28mFrontier
Deal found 8/20$104
This Frontier deal was found by Cheapflights users on 8/20. 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.
jue. 9/116:00 amDEN - STL
Nonstop2h 06mFrontier
mar. 9/167:55 pmSTL - DEN
Nonstop2h 25mFrontier
Deal found 8/20$105
This Kiwi.com deal was found by Cheapflights users on 8/20. 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.
jue. 9/116:00 amDEN - STL
Nonstop2h 06mFrontier
mié. 9/177:55 pmSTL - DEN
Nonstop2h 25mFrontier
Deal found 8/20$106
This Cheapflightsfares deal was found by Cheapflights users on 8/20. 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.
mar. 9/96:00 amDEN - STL
Nonstop2h 06mFrontier
vie. 9/127:55 pmSTL - DEN
Nonstop2h 25mFrontier
Deal found 8/20$107
This Kiwi.com deal was found by Cheapflights users on 8/20. 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.
dom. 9/216:00 amDEN - STL
Nonstop2h 06mFrontier
sáb. 9/277:55 pmSTL - DEN
Nonstop2h 25mFrontier
Deal found 8/20$108
This Frontier deal was found by Cheapflights users on 8/20. 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.
jue. 9/116:00 amDEN - STL
Nonstop2h 06mFrontier
lun. 9/157:55 pmSTL - DEN
Nonstop2h 25mFrontier
Deal found 8/20$109
This Kiwi.com deal was found by Cheapflights users on 8/20. 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.
vie. 9/126:00 amDEN - STL
Nonstop2h 06mFrontier
sáb. 9/137:55 pmSTL - DEN
Nonstop2h 25mFrontier
Deal found 8/20$111
This Kiwi.com deal was found by Cheapflights users on 8/20. 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.
lun. 9/86:00 amDEN - STL
Nonstop2h 06mFrontier
jue. 9/187:55 pmSTL - DEN
Nonstop2h 25mFrontier
Deal found 8/20$112
This Cheapflightsfares deal was found by Cheapflights users on 8/21. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/306:00 amDEN - STL
Nonstop2h 07mFrontier
lun. 11/37:45 pmSTL - DEN
Nonstop2h 28mFrontier
Deal found 8/21$113
This Priceline deal was found by Cheapflights users on 8/21. 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.
jue. 9/46:00 amDEN - STL
Nonstop2h 06mFrontier
lun. 9/89:29 pmSTL - DEN
1 stop7h 31mFrontier
Deal found 8/21$116
This Cheapflightsfares deal was found by Cheapflights users on 8/20. 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.
mié. 8/276:00 amDEN - STL
Nonstop2h 11mFrontier
dom. 8/317:54 pmSTL - DEN
Nonstop2h 29mFrontier
Deal found 8/20$117
This American Airlines deal was found by Cheapflights users on 8/19. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/2812:13 pmDRO - STL
1 stop7h 40mAmerican Airlines
mar. 11/43:59 pmSTL - DRO
1 stop6h 27mAmerican Airlines
Deal found 8/19$238

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 agosto 21, 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

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

jue. 10/9

6:00 am-9:07 am

Nonstop2h 07m

Lambert-St Louis

mar. 10/14

7:52 pm-9:20 pm

Nonstop2h 28m

$104

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

jue. 9/11

6:00 am-9:06 am

Nonstop2h 06m

Lambert-St Louis

mar. 9/16

7:55 pm-9:20 pm

Nonstop2h 25m

$105

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

mié. 9/10

6:00 am-9:06 am

Nonstop2h 06m

Lambert-St Louis

lun. 9/15

7:55 pm-9:20 pm

Nonstop2h 25m

$105

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

mar. 9/9

6:00 am-9:06 am

Nonstop2h 06m

Lambert-St Louis

lun. 9/15

7:55 pm-9:20 pm

Nonstop2h 25m

$105

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

lun. 9/8

6:00 am-9:06 am

Nonstop2h 06m

Lambert-St Louis

lun. 9/15

7:55 pm-9:20 pm

Nonstop2h 25m

$105

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

jue. 9/11

6:00 am-9:06 am

Nonstop2h 06m

Lambert-St Louis

sáb. 9/13

7:55 pm-9:20 pm

Nonstop2h 25m

$105

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

sáb. 9/13

6:00 am-9:06 am

Nonstop2h 06m

Lambert-St Louis

lun. 9/15

7:55 pm-9:20 pm

Nonstop2h 25m

$105

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

jue. 9/11

6:00 am-9:06 am

Nonstop2h 06m

Lambert-St Louis

mié. 9/17

7:55 pm-9:20 pm

Nonstop2h 25m

$106

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

vie. 9/26

6:00 am-9:06 am

Nonstop2h 06m

Lambert-St Louis

dom. 9/28

7:55 pm-9:20 pm

Nonstop2h 25m

$107

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

mar. 9/9

6:00 am-9:06 am

Nonstop2h 06m

Lambert-St Louis

vie. 9/12

7:55 pm-9:20 pm

Nonstop2h 25m

$107

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/20

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, August is the cheapest month in which you can book a flight from Colorado to St. Louis (average of $311). Flying from Colorado to St. Louis in March is currently the most expensive (average of $356). 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 agosto 21, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Colorado to St. Louis as you normally would.

Weekly flight availability from Colorado to St. Louis

Explore weekly flight availability from Colorado to St. Louis. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated agosto 21, 2025.

The most flights from USCO to STL are scheduled on a Monday (17 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (5 on average).

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 30 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 2h 07m. Colorado and St. Louis are separated by a distance of 767 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • 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, Colorado Springs - Lambert-St Louis or Durango La Plata 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 (86%), Air Canada (65%) and United Airlines (65%).

  • 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 $185, our data indicates the cheapest price to be $41. The most popular route (Denver Intl - Lambert-St Louis), is priced around $138.

  • 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, August is the cheapest month in which you can book a flight from Colorado to St. Louis (average of $311). Flying from Colorado to St. Louis in March is currently the most expensive (average of $356). 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
O'Fallon
Fairview Heights
Maryland Heights
Collinsville
Eureka
St. Peters
Glencoe
Alton
Chesterfield
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 agosto 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$55Average$154FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$154Average$448FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$174Average$332FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$227Average$394FlexibilityNo cancel feeOn-time71%

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