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$83+ 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 7/9. Fares are subject to change and may not be available on all flights or dates of travel.
STL — DEN
jun. 17 — jun. 241
mar. 6/17
mar. 6/24
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 junio 12, 2025.

Round-trip from

$139
(Priceline)

One-way from

$84
(Frontier)

Popular in

March

Cheapest in

September

Average price

$261

Good round-trip deal

$244 or less

Good one-way deal

$123 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. 16% potential increase in price ($40 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 June 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 junio 12, 2025.

This Priceline deal was found by Cheapflights users on 6/12. 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.
mié. 7/97:29 pmSTL - DEN
Nonstop2h 29mFrontier
mié. 7/166:00 amDEN - STL
Nonstop2h 11mFrontier
Deal found 6/12$139
This Southwest deal was found by Cheapflights users on 6/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/46:45 pmSTL - DEN
Nonstop2h 20mSouthwest
jue. 8/145:30 amDEN - STL
Nonstop2h 00mSouthwest
Deal found 6/10$157
This American Airlines deal was found by Cheapflights users on 6/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 8/1212:20 pmSTL - DEN
1 stop6h 43mAmerican Airlines
sáb. 8/1611:59 pmDEN - STL
1 stop7h 07mAmerican Airlines
Deal found 6/10$182
This United Airlines deal was found by Cheapflights users on 6/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 8/128:00 amSTL - DEN
1 stop5h 32mUnited Airlines
sáb. 8/161:25 pmDEN - STL
Nonstop2h 06mUnited Airlines
Deal found 6/10$187
This Delta deal was found by Cheapflights users on 6/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 7/237:45 amSTL - DEN
1 stop8h 15mDelta
vie. 7/2512:59 amDEN - STL
1 stop7h 02mDelta
Deal found 6/10$197
This Delta deal was found by Cheapflights users on 6/12. 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.
mar. 8/53:41 pmSTL - COS
1 stop6h 42mDelta
mar. 8/125:55 pmCOS - STL
1 stop5h 43mDelta
Deal found 6/12$217
This Southwest deal was found by Cheapflights users on 6/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/56:00 amSTL - COS
1 stop8h 50mSouthwest
mar. 11/1111:50 amCOS - STL
2 stops8h 10mSouthwest
Deal found 6/10$222
This United Airlines deal was found by Cheapflights users on 6/11. 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.
mié. 7/25:15 amSTL - ASE
1 stop4h 27mUnited Airlines
sáb. 7/128:50 amASE - STL
1 stop6h 41mUnited Airlines
Deal found 6/11$229
This American Airlines deal was found by Cheapflights users on 6/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 8/247:01 amSTL - MTJ
1 stop7h 46mAmerican Airlines
mié. 8/272:37 pmMTJ - STL
1 stop4h 45mAmerican Airlines
Deal found 6/10$231
This American Airlines deal was found by Cheapflights users on 6/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 6/255:37 amSTL - EGE
1 stop5h 10mAmerican Airlines
mar. 7/110:27 amEGE - STL
1 stop6h 53mAmerican Airlines
Deal found 6/11$249
This American Airlines deal was found by Cheapflights users on 6/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/76:14 pmSTL - GJT
1 stop7h 07mAmerican Airlines
vie. 8/1511:45 amGJT - STL
2 stops10h 29mAmerican Airlines
Deal found 6/10$254
This United Airlines deal was found by Cheapflights users on 6/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 7/54:45 pmSTL - DRO
1 stop4h 54mUnited Airlines
mar. 7/156:07 pmDRO - STL
1 stop4h 52mUnited Airlines
Deal found 6/10$264

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 junio 12, 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

mié. 7/9

7:29 pm-8:58 pm

Nonstop2h 29m

Denver Intl

mié. 7/16

6:00 am-9:11 am

Nonstop2h 11m

$139

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

lun. 8/4

6:45 pm-8:05 pm

Nonstop2h 20m

Denver Intl

jue. 8/14

5:30 am-8:30 am

Nonstop2h 00m

$157

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

mar. 8/12

12:20 pm-6:03 pm

1 stop6h 43m

Denver Intl

sáb. 8/16

11:59 pm-8:06 am

1 stop7h 07m

$182

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

mar. 8/12

5:31 pm-11:22 pm

1 stop6h 51m

Denver Intl

sáb. 8/16

5:37 pm-8:45 pm

Nonstop2h 08m

$187

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

mié. 7/23

7:45 am-3:00 pm

1 stop8h 15m

Denver Intl

vie. 7/25

12:59 am-9:01 am

1 stop7h 02m

$197

St. LouisColorado Springs

STL - COS

STLCOS

Lambert-St Louis

mar. 8/5

3:41 pm-9:23 pm

1 stop6h 42m

Colorado Springs

mar. 8/12

5:55 pm-12:38 am

1 stop5h 43m

$217

St. LouisColorado Springs

STL - COS

STLCOS

Lambert-St Louis

mié. 11/5

6:00 am-1:50 pm

1 stop8h 50m

Colorado Springs

mar. 11/11

11:50 am-9:00 pm

2 stops8h 10m

$222

St. LouisAspen

STL - ASE

STLASE

Lambert-St Louis

mié. 7/2

5:15 am-8:42 am

1 stop4h 27m

Aspen Pitkin County

sáb. 7/12

8:50 am-4:31 pm

1 stop6h 41m

$229

St. LouisMontrose

STL - MTJ

STLMTJ

Lambert-St Louis

dom. 8/24

7:01 am-1:47 pm

1 stop7h 46m

Montrose County

mié. 8/27

2:37 pm-8:22 pm

1 stop4h 45m

$231

St. LouisVail

STL - EGE

STLEGE

Lambert-St Louis

mié. 6/25

5:37 am-9:47 am

1 stop5h 10m

Vail Eagle County

mar. 7/1

10:27 am-6:20 pm

1 stop6h 53m

$249

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/12

Showing 1-10 of 43 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 junio 12, 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 junio 12, 2025.

The most flights from STL to USCO are scheduled on a Monday (18 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (6 on average).

Rainfall in Colorado by month

Plan your trip to Colorado by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Colorado ranges from 0.5 - 2.3 inches per month. May is typically the wettest month, when rainfall can reach 2.3 in. January is typically the driest time to visit Colorado when rainfall is around 0.5 in.

Temperature in Colorado by month

Plan your trip to Colorado by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Colorado, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

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 junio 12, 2025.
Read through reviews of airlines operating flights from St. Louis to Colorado, such as Alaska Airlines, Southwest and Delta. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,950 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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 192 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 $84. Users have also found prices from $89 and $99 on United Airlines and Delta, 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 - Colorado Springs or Lambert-St Louis - Montrose County 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 (95%), United Airlines (79%) and Air Canada (74%).

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

    The cheapest flight price from St. Louis to Colorado is $76. On average you can expect to pay $865. The most popular route, (Lambert-St Louis - Denver Intl), can usually be booked for $146.

  • 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.

See more FAQs

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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 junio 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$45Average$117FlexibilityNo cancel feeOn-time62%
DeltaCheapest$128Average$291FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$152Average$485FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$187Average$482FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$192Average$410FlexibilityNo cancel feeOn-time71%

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