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$78+ 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 5/16. Fares are subject to change and may not be available on all flights or dates of travel.
STL — DEN
May 5 — May 121
Mon 5/5
Mon 5/12
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 April 30, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$96
(Cheapflightsfares)

One-way from

$78
(Cheapflightsfares)

Popular in

March

Cheapest in

August

Average price

$191

Good round-trip deal

$254 or less

Good one-way deal

$128 or less
Provider with most accurate pricing for Lambert-St Louis-Denver Intl flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-Denver Intl flights.
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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. 21% potential increase in price ($53 potential increase over avg. RT price).
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Cheapest flight prices on average. 7% potential price decrease ($13 potential savings vs. average RT price).
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Average for round-trip flights in April 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 April 30, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 4/28. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/287:55 pmSTL - DEN
Nonstop2h 32mFrontier
Wed 6/47:00 amDEN - STL
Nonstop2h 08mFrontier
Deal found 4/28$96
This Delta deal was found by Cheapflights users on 4/28. 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.
Sat 5/317:30 amSTL - DEN
1 stop5h 34mDelta
Wed 6/46:25 pmDEN - STL
1 stop5h 08mDelta
Deal found 4/28$217
This Southwest deal was found by Cheapflights users on 4/29. 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.
Tue 5/275:55 amSTL - DEN
Nonstop2h 20mSouthwest
Tue 6/310:25 amDEN - STL
Nonstop2h 05mSouthwest
Deal found 4/29$223
This CheapOair deal was found by Cheapflights users on 4/28. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/126:53 pmSTL - DEN
Nonstop2h 29mMultiple Airlines
Thu 5/156:30 pmDEN - STL
1 stop16h 07mMultiple Airlines
Deal found 4/28$239
This Delta deal was found by Cheapflights users on 4/28. 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 6/116:30 amSTL - COS
1 stop4h 32mDelta
Wed 6/186:00 amCOS - STL
1 stop7h 37mDelta
Deal found 4/28$243
This American Airlines deal was found by Cheapflights users on 4/27. 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.
Sun 5/255:19 amSTL - COS
1 stop5h 23mAmerican Airlines
Thu 5/2910:34 amCOS - STL
1 stop6h 47mAmerican Airlines
Deal found 4/27$255
This American Airlines deal was found by Cheapflights users on 4/29. 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.
Thu 6/195:29 pmSTL - DEN
1 stop7h 15mAmerican Airlines
Tue 6/2412:22 pmDEN - STL
1 stop7h 08mAmerican Airlines
Deal found 4/29$265
This United Airlines deal was found by Cheapflights users on 4/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/141:42 pmSTL - GUC
1 stop7h 25mUnited Airlines
Wed 6/181:38 pmGUC - STL
1 stop6h 10mUnited Airlines
Deal found 4/28$269
This United Airlines deal was found by Cheapflights users on 4/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/265:20 amSTL - COS
1 stop6h 34mUnited Airlines
Mon 6/23:47 pmCOS - STL
1 stop4h 01mUnited Airlines
Deal found 4/28$271
This United Airlines deal was found by Cheapflights users on 4/29. 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.
Sat 8/95:15 amSTL - DEN
Nonstop2h 37mUnited Airlines
Thu 8/148:40 pmDEN - STL
Nonstop2h 19mUnited Airlines
Deal found 4/29$275
This Southwest deal was found by Cheapflights users on 4/27. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/95:25 amSTL - COS
1 stop5h 05mSouthwest
Sat 7/1212:05 pmCOS - STL
1 stop5h 15mSouthwest
Deal found 4/27$292
This American Airlines deal was found by Cheapflights users on 4/29. 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.
Wed 8/205:15 amSTL - GJT
1 stop7h 41mAmerican Airlines
Sun 8/245:00 amGJT - STL
2 stops9h 42mAmerican Airlines
Deal found 4/29$294

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 April 30, 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

Wed 5/28

7:55 pm-9:27 pm

Nonstop2h 32m

Denver Intl

Wed 6/4

7:00 am-10:08 am

Nonstop2h 08m

$96

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Sat 5/31

7:30 am-12:04 pm

1 stop5h 34m

Denver Intl

Wed 6/4

6:25 pm-12:33 am

1 stop5h 08m

$217

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Tue 5/27

5:55 am-7:15 am

Nonstop2h 20m

Denver Intl

Tue 6/3

10:25 am-1:30 pm

Nonstop2h 05m

$223

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Tue 5/27

5:00 am-8:58 am

1 stop4h 58m

Denver Intl

Tue 6/3

5:40 pm-8:48 pm

Nonstop2h 08m

$233

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Mon 5/12

6:53 pm-8:22 pm

Nonstop2h 29m

Denver Intl

Thu 5/15

6:30 pm-11:37 am

1 stop16h 07m

$239

St. LouisColorado Springs

STL - COS

STLCOS

Lambert-St Louis

Tue 5/27

7:19 pm-11:45 pm

1 stop5h 26m

Colorado Springs

Thu 5/29

10:34 am-6:21 pm

1 stop6h 47m

$255

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Thu 6/12

4:37 pm-10:56 pm

1 stop7h 19m

Denver Intl

Mon 6/16

5:30 pm-11:54 pm

1 stop5h 24m

$264

St. LouisColorado Springs

STL - COS

STLCOS

Lambert-St Louis

Sat 6/7

1:42 pm-4:37 pm

1 stop3h 55m

Colorado Springs

Mon 6/9

2:35 pm-8:48 pm

1 stop5h 13m

$271

St. LouisAspen

STL - ASE

STLASE

Lambert-St Louis

Sat 8/16

4:45 pm-8:12 pm

1 stop4h 27m

Aspen Pitkin County

Tue 8/19

1:15 pm-8:46 pm

1 stop6h 31m

$289

St. LouisColorado Springs

STL - COS

STLCOS

Lambert-St Louis

Sat 6/7

2:30 pm-10:30 pm

2 stops9h 00m

Colorado Springs

Mon 6/9

6:05 pm-12:35 am

1 stop5h 30m

$326

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/28

Showing 1-10 of 37 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 April 30, 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.

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 April 30, 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
9,961 reviews

Comfort

7.9

Crew

8.5

Entertainment

7.1

Overall

8.0

Boarding

8.2

Food

7.1

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
9,961 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Crew

8.5

Entertainment

7.1

Overall

8.0

Boarding

8.2

Food

7.1

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
4,295 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Crew

8.5

Entertainment

7.1

Overall

8.0

Boarding

8.2

Food

7.1

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
7,929 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Crew

8.5

Entertainment

7.1

Overall

8.0

Boarding

8.2

Food

7.1

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
8,696 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Crew

8.5

Entertainment

7.1

Overall

8.0

Boarding

8.2

Food

7.1

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
9,961 reviews

Comfort

7.9

Crew

8.5

Entertainment

7.1

Overall

8.0

Boarding

8.2

Food

7.1

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 199 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 $78. Users have also found prices from $99 and $108 on United Airlines and Sun Country Air, 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 Southwest (85%), Air Canada (79%) and United Airlines (73%).

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

    The cheapest flight price from St. Louis to Colorado is $86. On average you can expect to pay $834. The most popular route, (Lambert-St Louis - Denver Intl), can usually be booked for $154.

  • 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 April 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$46Average$115FlexibilityNo cancel feeOn-time62%
DeltaCheapest$128Average$291FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$153Average$507FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$180Average$483FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$192Average$424FlexibilityNo cancel feeOn-time71%

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