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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 1/7. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — STL
Jan 22 — Jan 291
Thu 1/22
Thu 1/29
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 23, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/22. 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 Kiwi.com 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 12/22$182
This Frontier deal was found by Cheapflights users on 12/21. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/297:00 amDEN - STL
1 stop13h 25mFrontier
Fri 1/28:42 pmSTL - DEN
1 stop13h 13mFrontier
Deal found 12/21$257
This CheapOair deal was found by Cheapflights users on 12/20. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/256:00 amDEN - STL
1 stop25h 12mFrontier
Wed 12/315:19 pmSTL - DEN
1 stop11h 39mFrontier
Deal found 12/20$265
This CheapOair deal was found by Cheapflights users on 12/21. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/2411:59 pmDEN - STL
1 stop21h 34mFrontier
Fri 1/28:42 pmSTL - DEN
1 stop13h 13mFrontier
Deal found 12/21$268
This Cheapflightsfares deal was found by Cheapflights users on 12/20. 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.
Wed 12/3111:59 pmDEN - STL
1 stop21h 34mFrontier
Sat 1/37:43 pmSTL - DEN
Nonstop2h 32mFrontier
Deal found 12/20$270
This Kiwi.com deal was found by Cheapflights users on 12/22. 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 Kiwi.com 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 1/58:52 pmSTL - DEN
1 stop14h 10mFrontier
Deal found 12/22$272
This Frontier deal was found by Cheapflights users on 12/21. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2811:59 pmDEN - STL
1 stop8h 46mFrontier
Fri 1/28:42 pmSTL - DEN
1 stop13h 13mFrontier
Deal found 12/21$282
This Frontier deal was found by Cheapflights users on 12/21. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/297:00 amDEN - STL
1 stop13h 25mFrontier
Wed 12/314:27 pmSTL - DEN
1 stop7h 37mFrontier
Deal found 12/21$283
This United Airlines deal was found by Cheapflights users on 12/22. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/315:10 pmCOS - STL
1 stop4h 12mUnited Airlines
Mon 1/52:45 pmSTL - COS
1 stop5h 10mUnited Airlines
Deal found 12/22$348
This American Airlines deal was found by Cheapflights users on 12/21. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/2510:34 amGJT - STL
1 stop7h 48mAmerican Airlines
Thu 1/12:04 pmSTL - GJT
2 stops10h 22mAmerican Airlines
Deal found 12/21$379
This United Airlines deal was found by Cheapflights users on 12/22. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/315:10 pmCOS - STL
1 stop4h 12mUnited Airlines
Sun 1/42:45 pmSTL - COS
1 stop6h 01mUnited Airlines
Deal found 12/22$409
This Delta deal was found by Cheapflights users on 12/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/263:35 pmEGE - STL
1 stop7h 07mDelta
Mon 12/296:05 amSTL - EGE
1 stop5h 35mDelta
Deal found 12/20$449

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 23, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$104
(Expedia)

One-way from

$28
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$280

Good round-trip deal

$175 or less

Good one-way deal

$74 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. 9% potential increase in price ($24 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 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 23, 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 1/23

3:38 pm-6:44 pm

Nonstop2h 06m

Lambert-St Louis

Mon 1/26

10:16 am-5:36 pm

1 stop8h 20m

$124

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Sat 1/10

6:33 pm-8:40 am

1 stop13h 07m

Lambert-St Louis

Mon 1/12

1:07 pm-11:19 pm

1 stop11h 12m

$162

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Sat 1/24

11:38 am-2:46 pm

Nonstop2h 08m

Lambert-St Louis

Mon 1/26

10:16 am-11:29 pm

2 stops14h 13m

$171

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Sat 1/24

10:10 am-1:16 pm

Nonstop2h 06m

Lambert-St Louis

Mon 1/26

8:45 am-10:21 am

Nonstop2h 36m

$177

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Thu 1/8

6:00 am-2:48 pm

1 stop7h 48m

Lambert-St Louis

Fri 1/9

8:35 am-5:22 pm

1 stop9h 47m

$194

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Fri 2/6

9:05 pm-11:33 pm

2 stops25h 28m

Lambert-St Louis

Mon 2/9

9:45 pm-3:56 am

1 stop7h 11m

$199

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Thu 2/5

10:01 am-9:06 pm

1 stop10h 05m

Lambert-St Louis

Sun 2/8

5:42 pm-8:16 pm

2 stops27h 34m

$209

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Fri 1/30

1:28 pm-11:33 pm

1 stop9h 05m

Lambert-St Louis

Mon 2/2

8:22 pm-11:39 am

2 stops16h 17m

$213

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Fri 1/23

1:53 pm-4:55 pm

Nonstop2h 02m

Lambert-St Louis

Mon 1/26

8:45 am-10:21 am

Nonstop2h 36m

$217

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Fri 2/6

5:50 pm-8:58 pm

Nonstop2h 08m

Lambert-St Louis

Mon 2/9

4:15 pm-5:53 pm

Nonstop2h 38m

$217

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/21

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 December 23, 2025.

It’s optimal to fly from Colorado to St. Louis in the evening. By choosing this option you can save up to 39% 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 23, 2025.

The most flights from USCO to STL are scheduled on a Monday (13 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (4 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 32 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 06m. 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 ($28), Southwest ($79), and United Airlines ($111).

  • 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 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 SkyWest Airlines (100%), Frontier (91%) and Air Canada (83%).

  • 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 $213, our data indicates the cheapest price to be $40. The most popular route (Denver Intl - Lambert-St Louis), is priced around $127.

  • 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
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
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 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$55Average$163FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$162Average$429FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$177Average$345FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$227Average$436FlexibilityNo cancel feeOn-time71%

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