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$89+ Cheap flights from St. Louis (STL) to Colorado

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 9/28. Fares are subject to change and may not be available on all flights or dates of travel.
STL — DEN
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
1 adult, Economy
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Cheap flight deals from St. Louis to Colorado

Keep the following information in mind while searching for St. Louis to Colorado flight deals. Data was last updated July 29, 2025.

Round-trip from

$103
(Cheapflightsfares)

One-way from

$89
(Kiwi.com)

Popular in

March

Cheapest in

September

Average price

$260

Good round-trip deal

$187 or less

Good one-way deal

$121 or less
From Lambert-St Louis to Colorado
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One-way flight from Lambert-St Louis to Colorado
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Highest demand for flights based on searches. 14% potential increase in price ($36 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($12 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from Lambert-St Louis to Colorado.
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Price to beat on a one-way flight from Lambert-St Louis to Colorado.
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Find flight deals from St. Louis to Colorado

Cheapest flights from St. Louis to Colorado
Explore the most affordable flight options available from St. Louis to Colorado. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

This Frontier deal was found by Cheapflights users on 7/29. 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.
Tue 9/167:55 pmSTL - DEN
Nonstop2h 25mFrontier
Wed 9/246:00 amDEN - STL
Nonstop2h 06mFrontier
Deal found 7/29$101
This American Airlines deal was found by Cheapflights users on 7/26. 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.
Mon 8/259:23 amSTL - EGE
1 stop5h 35mAmerican Airlines
Tue 9/912:28 pmEGE - STL
1 stop4h 54mAmerican Airlines
Deal found 7/26$229
This American Airlines deal was found by Cheapflights users on 7/27. 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.
Sat 8/235:15 amSTL - ASE
1 stop7h 16mAmerican Airlines
Sat 8/3010:18 amASE - STL
1 stop7h 12mAmerican Airlines
Deal found 7/27$229
This American Airlines deal was found by Cheapflights users on 7/29. 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 8/197:01 amSTL - MTJ
1 stop7h 46mAmerican Airlines
Tue 8/262:37 pmMTJ - STL
1 stop4h 45mAmerican Airlines
Deal found 7/29$237
This Southwest deal was found by Cheapflights users on 7/29. 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 9/46:00 pmSTL - COS
1 stop5h 30mSouthwest
Mon 9/811:45 amCOS - STL
1 stop5h 55mSouthwest
Deal found 7/29$237
This American Airlines deal was found by Cheapflights users on 7/27. 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.
Sat 8/305:15 amSTL - DRO
1 stop7h 50mAmerican Airlines
Sat 9/68:29 amDRO - STL
1 stop5h 40mAmerican Airlines
Deal found 7/27$238
This Delta deal was found by Cheapflights users on 7/29. 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 9/122:31 pmSTL - COS
1 stop8h 40mDelta
Tue 9/165:55 pmCOS - STL
2 stops13h 19mDelta
Deal found 7/29$242
This Delta deal was found by Cheapflights users on 7/28. 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.
Wed 8/207:35 amSTL - GJT
1 stop5h 58mDelta
Sun 8/246:54 pmGJT - STL
1 stop4h 44mDelta
Deal found 7/28$249
This American Airlines deal was found by Cheapflights users on 7/27. 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.
Wed 8/209:23 amSTL - GJT
2 stops10h 17mAmerican Airlines
Sun 8/245:00 amGJT - STL
2 stops9h 42mAmerican Airlines
Deal found 7/27$259
This American Airlines deal was found by Cheapflights users on 7/29. 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 8/265:15 amSTL - COS
1 stop5h 47mAmerican Airlines
Tue 9/25:24 pmCOS - STL
1 stop4h 50mAmerican Airlines
Deal found 7/29$282
This United Airlines deal was found by Cheapflights users on 7/27. 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.
Sat 9/209:07 amSTL - EGE
1 stop4h 29mUnited Airlines
Tue 9/301:40 pmEGE - STL
1 stop6h 06mUnited Airlines
Deal found 7/27$306
This United Airlines deal was found by Cheapflights users on 7/29. 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.
Tue 8/199:17 amSTL - MTJ
2 stops12h 05mUnited Airlines
Sat 8/231:43 pmMTJ - STL
1 stop6h 13mUnited Airlines
Deal found 7/29$312

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Colorado 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 July 29, 2025.
Use the filters below to find and compare flights from St. Louis to Colorado that are best for you.

Fly from

St. Louis

Fly to

Colorado

Route

Depart

Return

Price

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Sat 8/23

7:54 pm-9:23 pm

Nonstop2h 29m

Denver Intl

Fri 8/29

6:00 am-9:11 am

Nonstop2h 11m

$103

St. LouisAspen

STL - ASE

STLASE

Lambert-St Louis

Sat 8/23

5:15 am-11:31 am

1 stop7h 16m

Aspen Pitkin County

Sat 8/30

10:18 am-6:30 pm

1 stop7h 12m

$229

St. LouisVail

STL - EGE

STLEGE

Lambert-St Louis

Mon 8/25

9:23 am-1:58 pm

1 stop5h 35m

Vail Eagle County

Tue 9/9

12:28 pm-6:22 pm

1 stop4h 54m

$229

St. LouisColorado Springs

STL - COS

STLCOS

Lambert-St Louis

Thu 10/2

5:00 am-9:55 am

1 stop5h 55m

Colorado Springs

Sun 10/5

6:05 pm-11:30 pm

1 stop4h 25m

$237

St. LouisDurango

STL - DRO

STLDRO

Lambert-St Louis

Sat 8/30

5:15 am-12:05 pm

1 stop7h 50m

Durango La Plata County

Sat 9/6

8:29 am-3:09 pm

1 stop5h 40m

$238

St. LouisMontrose

STL - MTJ

STLMTJ

Lambert-St Louis

Sun 8/24

9:23 am-1:47 pm

1 stop5h 24m

Montrose County

Wed 8/27

2:37 pm-11:14 pm

1 stop7h 37m

$239

St. LouisGrand Junction

STL - GJT

STLGJT

Lambert-St Louis

Wed 8/20

7:35 am-12:33 pm

1 stop5h 58m

Grand Junction Regnl

Sun 8/24

6:54 pm-12:38 am

1 stop4h 44m

$249

St. LouisColorado Springs

STL - COS

STLCOS

Lambert-St Louis

Wed 8/27

3:42 pm-8:41 pm

1 stop5h 59m

Colorado Springs

Sun 8/31

5:55 pm-12:39 am

1 stop5h 44m

$252

St. LouisGrand Junction

STL - GJT

STLGJT

Lambert-St Louis

Wed 8/20

9:23 am-6:40 pm

2 stops10h 17m

Grand Junction Regnl

Sun 8/24

5:00 am-3:42 pm

2 stops9h 42m

$259

St. LouisColorado Springs

STL - COS

STLCOS

Lambert-St Louis

Sun 9/7

6:05 am-11:33 am

1 stop6h 28m

Colorado Springs

Wed 9/10

5:16 pm-10:50 pm

1 stop4h 34m

$282

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

Showing 1-10 of 32 results
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Best time to book a flight from St. Louis to Colorado

Have a flexible travel schedule? Discover the best time to fly to Colorado from St. Louis 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 St. Louis to Colorado

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

Currently, October is the cheapest month in which you can book a flight from St. Louis to Colorado (average of $197). Flying from St. Louis to Colorado in March is currently the most expensive (average of $278). 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 STL to CO?

Find hourly flight availability from St. Louis to Colorado. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 29, 2025.

When flying from St. Louis to Colorado, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from St. Louis to Colorado

Explore weekly flight availability from St. Louis to Colorado. 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 July 29, 2025.

The most flights from STL to USCO are scheduled on a Monday (19 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (6 on average).

Reviews of airlines servicing Colorado

Get insights into the airlines that provide service to Colorado. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Colorado. Reviews last updated July 29, 2025.
Peruse reviews from past customers who have flown with Southwest, Delta, and United Airlines from St. Louis to Colorado to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,238 reviews

Food

7.0

Comfort

8.0

Overall

8.0

Crew

8.6

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Southwest
8.0
Very good
4,238 reviews
Southwest
8.0
Very good
4,238 reviews

Food

7.0

Comfort

8.0

Overall

8.0

Crew

8.6

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Delta
8.0
Very good
7,979 reviews
Southwest
8.0
Very good
4,238 reviews

Food

7.0

Comfort

8.0

Overall

8.0

Crew

8.6

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
United Airlines
7.4
Good
8,896 reviews
Southwest
8.0
Very good
4,238 reviews

Food

7.0

Comfort

8.0

Overall

8.0

Crew

8.6

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,238 reviews

Food

7.0

Comfort

8.0

Overall

8.0

Crew

8.6

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Frontier
5.9
Fair
3,238 reviews
Southwest
8.0
Very good
4,238 reviews

Food

7.0

Comfort

8.0

Overall

8.0

Crew

8.6

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Colorado. 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 from for flights from St. Louis to Colorado?

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

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

    This flight path from Lambert-St Louis to Colorado was viewed by 195 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

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

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $89. Users have also found prices from $94 and $99 on American Airlines and Southwest, respectively.

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

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

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

    The top 3 most reliable airlines when flying from St. Louis to Colorado are SkyWest Airlines (92%), United Airlines (69%) and Air Canada (64%).

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

    The cheapest flight price from St. Louis to Colorado is $78. On average you can expect to pay $830. The most popular route, (Lambert-St Louis - Denver Intl), can usually be booked for $92.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from St. Louis to Colorado 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 St. Louis to Colorado?

    Currently, October is the cheapest month in which you can book a flight from St. Louis to Colorado (average of $197). Flying from St. Louis to Colorado in March is currently the most expensive (average of $278). 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.

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Alternative routes for St. Louis to Colorado

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from St. Louis to Colorado

Discover the top 5 airlines that operate flights from St. Louis to Colorado. 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 July 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$45Average$127FlexibilityNo cancel feeOn-time62%
DeltaCheapest$128Average$294FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$154Average$481FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$177Average$480FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$201Average$395FlexibilityNo cancel feeOn-time71%

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