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St. Louis

$28+ 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 1/24. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — STL
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
1 adult, Economy
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Cheap 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 December 12, 2025.

This Frontier deal was found by Cheapflights users on 12/11. 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.
Wed 12/316:50 amDEN - STL
Nonstop2h 12mFrontier
Wed 1/77:43 pmSTL - DEN
Nonstop2h 32mFrontier
Deal found 12/11$138
This Frontier deal was found by Cheapflights users on 12/11. 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.
Wed 12/316:50 amDEN - STL
Nonstop2h 12mFrontier
Fri 1/97:43 pmSTL - DEN
Nonstop2h 32mFrontier
Deal found 12/11$153
This Frontier deal was found by Cheapflights users on 12/11. 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.
Wed 12/316:50 amDEN - STL
Nonstop2h 12mFrontier
Mon 1/57:43 pmSTL - DEN
Nonstop2h 32mFrontier
Deal found 12/11$175
This Frontier deal was found by Cheapflights users on 12/10. 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.
Wed 12/316:50 amDEN - STL
Nonstop2h 12mFrontier
Fri 1/210:10 pmSTL - DEN
1 stop11h 54mFrontier
Deal found 12/10$186
This Frontier deal was found by Cheapflights users on 12/10. 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.
Mon 12/296:15 amDEN - STL
1 stop12h 52mFrontier
Wed 12/317:43 pmSTL - DEN
Nonstop2h 32mFrontier
Deal found 12/10$197
This Frontier deal was found by Cheapflights users on 12/10. 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.
Sat 12/276:50 amDEN - STL
Nonstop2h 12mFrontier
Wed 12/317:43 pmSTL - DEN
Nonstop2h 32mFrontier
Deal found 12/10$205
This Frontier deal was found by Cheapflights users on 12/10. 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.
Mon 12/296:15 amDEN - STL
1 stop12h 52mFrontier
Fri 1/210:10 pmSTL - DEN
1 stop6h 48mFrontier
Deal found 12/10$208
This Super.com deal was found by Cheapflights users on 12/9. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/206:50 amDEN - STL
Nonstop2h 12mFrontier
Sat 1/37:43 pmSTL - DEN
Nonstop2h 32mFrontier
Deal found 12/9$210
This United Airlines deal was found by Cheapflights users on 12/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2112:25 pmHDN - STL
1 stop5h 53mUnited Airlines
Thu 12/259:00 amSTL - HDN
1 stop6h 28mUnited Airlines
Deal found 12/11$279
This American Airlines deal was found by Cheapflights users on 12/9. 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.
Fri 12/192:43 pmMTJ - STL
1 stop7h 15mAmerican Airlines
Sun 12/217:00 amSTL - MTJ
1 stop5h 40mAmerican Airlines
Deal found 12/9$319
This United Airlines deal was found by Cheapflights users on 12/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/191:22 pmMTJ - STL
2 stops8h 21mUnited Airlines
Sun 12/212:45 pmSTL - MTJ
1 stop6h 41mUnited Airlines
Deal found 12/9$376
This United Airlines deal was found by Cheapflights users on 12/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/193:25 pmMTJ - STL
1 stop5h 57mUnited Airlines
Mon 12/226:30 amSTL - MTJ
1 stop6h 09mUnited Airlines
Deal found 12/9$397

Find 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 December 12, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$104
(Frontier)

One-way from

$28
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$280

Good round-trip deal

$188 or less

Good one-way deal

$86 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. 10% potential increase in price ($25 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 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 December 12, 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

Fri 1/9

6:50 am-10:02 am

Nonstop2h 12m

Lambert-St Louis

Sun 1/11

12:37 pm-3:58 am

1 stop16h 21m

$165

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Wed 1/7

9:45 pm-12:12 pm

1 stop13h 27m

Lambert-St Louis

Sun 1/11

5:11 pm-5:59 pm

2 stops25h 48m

$180

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Sun 1/4

11:59 pm-8:12 am

1 stop7h 13m

Lambert-St Louis

Mon 1/5

10:10 pm-3:58 am

1 stop6h 48m

$197

DurangoSt. Louis

DRO - STL

DROSTL

Durango La Plata County

Wed 2/4

7:15 am-1:41 pm

1 stop5h 26m

Lambert-St Louis

Sat 2/7

4:15 pm-8:31 pm

1 stop5h 16m

$200

DurangoSt. Louis

DRO - STL

DROSTL

Durango La Plata County

Wed 1/21

1:20 pm-7:29 pm

1 stop5h 09m

Lambert-St Louis

Sat 1/24

11:55 am-4:18 pm

1 stop5h 23m

$200

DurangoSt. Louis

DRO - STL

DROSTL

Durango La Plata County

Wed 1/21

7:00 am-1:16 pm

1 stop5h 16m

Lambert-St Louis

Sat 1/24

8:45 am-12:36 pm

1 stop4h 51m

$200

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Wed 12/31

6:50 am-10:02 am

Nonstop2h 12m

Lambert-St Louis

Sat 1/3

7:43 pm-9:15 pm

Nonstop2h 32m

$228

VailSt. Louis

EGE - STL

EGESTL

Vail Eagle County

Thu 1/15

3:10 pm-11:39 pm

1 stop7h 29m

Lambert-St Louis

Sat 1/17

7:10 am-2:05 pm

1 stop7h 55m

$229

VailSt. Louis

EGE - STL

EGESTL

Vail Eagle County

Thu 1/15

3:10 pm-11:39 pm

1 stop7h 29m

Lambert-St Louis

Sun 1/18

7:10 am-2:05 pm

1 stop7h 55m

$229

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Sat 2/21

7:00 am-1:32 pm

1 stop5h 32m

Lambert-St Louis

Tue 2/24

7:00 am-12:00 pm

1 stop6h 00m

$237

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/11

Showing 1-10 of 55 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 December 12, 2025.

It’s optimal to fly from Colorado to St. Louis in the evening. By choosing this option you can save up to 38% 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 Friday mornings 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.

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 December 12, 2025.

The most flights from USCO to STL are scheduled on a Monday (12 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (6 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 34 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 12m. 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 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 ($27), Southwest ($79), and Delta ($98).

  • 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 Vail Eagle 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 SkyWest Airlines (100%), Frontier (92%) and Air Canada (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 $220, our data indicates the cheapest price to be $44. The most popular route (Denver Intl - Lambert-St Louis), is priced around $128.

  • 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
Swansea
Eureka
Glencoe
St. Peters
Chesterfield
Alton
Farmington
Festus

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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 December 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$54Average$162FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$158Average$417FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$177Average$344FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$227Average$436FlexibilityNo cancel feeOn-time71%

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