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$39+ 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 4/2. Fares are subject to change and may not be available on all flights or dates of travel.
STL — DEN
Mar 8 — Mar 151
Sat 3/8
Sat 3/15
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 March 3, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$87
(Cheapflightsfares)

One-way from

$39
(CheapOair)

Popular in

March

Cheapest in

April

Average price

$257

Good round-trip deal

$206 or less

Good one-way deal

$146 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. 7% potential increase in price ($15 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in March 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 March 3, 2025.

This Frontier deal was found by Cheapflights users on 3/3. 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 3/267:03 pmSTL - DEN
Nonstop2h 28mFrontier
Wed 4/26:00 amDEN - STL
Nonstop2h 06mFrontier
Deal found 3/3$88
This Delta deal was found by Cheapflights users on 3/2. 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 4/196:00 amSTL - DEN
1 stop5h 09mDelta
Sat 4/193:10 pmDEN - STL
1 stop5h 38mDelta
Deal found 3/2$217
This Southwest deal was found by Cheapflights users on 3/2. 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 4/165:20 amSTL - DEN
1 stop4h 30mSouthwest
Mon 4/216:35 amDEN - STL
Nonstop2h 00mSouthwest
Deal found 3/2$223
This Booking.com deal was found by Cheapflights users on 3/2. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/127:03 pmSTL - EGE
1 stop20h 04mFrontier
Sun 3/163:07 pmEGE - STL
1 stop17h 09mFrontier
Deal found 3/2$227
This American Airlines deal was found by Cheapflights users on 3/3. 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 4/115:27 pmSTL - DEN
1 stop7h 26mAmerican Airlines
Tue 4/159:06 amDEN - STL
1 stop6h 30mAmerican Airlines
Deal found 3/3$227
This Southwest deal was found by Cheapflights users on 3/2. 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 3/205:45 amSTL - COS
1 stop5h 25mSouthwest
Tue 3/254:20 pmCOS - STL
1 stop5h 05mSouthwest
Deal found 3/2$267
This United Airlines deal was found by Cheapflights users on 3/3. 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 3/175:33 pmSTL - COS
2 stops7h 26mUnited Airlines
Wed 3/197:30 amCOS - STL
1 stop4h 19mUnited Airlines
Deal found 3/3$272
This United Airlines deal was found by Cheapflights users on 3/3. 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 3/251:45 pmSTL - DEN
Nonstop2h 29mUnited Airlines
Wed 4/26:44 pmDEN - STL
Nonstop2h 06mUnited Airlines
Deal found 3/3$280
This American Airlines deal was found by Cheapflights users on 3/3. 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 4/45:26 amSTL - COS
1 stop5h 26mAmerican Airlines
Mon 4/74:39 pmCOS - STL
1 stop4h 49mAmerican Airlines
Deal found 3/3$287
This United Airlines deal was found by Cheapflights users on 3/1. 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 4/21:43 pmSTL - GUC
1 stop7h 27mUnited Airlines
Tue 4/81:41 pmGUC - STL
1 stop7h 09mUnited Airlines
Deal found 3/1$289
This United Airlines deal was found by Cheapflights users on 3/1. 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 4/24:45 pmSTL - MTJ
1 stop4h 45mUnited Airlines
Tue 4/81:40 pmMTJ - STL
1 stop7h 10mUnited Airlines
Deal found 3/1$291
This Delta deal was found by Cheapflights users on 3/2. 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 4/116:00 amSTL - COS
1 stop7h 32mDelta
Fri 4/186:00 amCOS - STL
1 stop8h 00mDelta
Deal found 3/2$307

Find flights from St. Louis to Colorado within your budget

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 March 3, 2025.

Fly from

St. Louis

Fly to

Colorado

Route

Depart

Return

Price

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Wed 3/26

7:03 pm-8:31 pm

Nonstop2h 28m

Denver Intl

Wed 4/2

6:00 am-9:06 am

Nonstop2h 06m

$88

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Sat 4/19

6:00 am-10:09 am

1 stop5h 09m

Denver Intl

Sat 4/19

3:10 pm-9:48 pm

1 stop5h 38m

$217

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Wed 4/16

5:20 am-8:50 am

1 stop4h 30m

Denver Intl

Mon 4/21

6:35 am-9:35 am

Nonstop2h 00m

$223

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Fri 4/11

5:27 pm-11:53 pm

1 stop7h 26m

Denver Intl

Tue 4/15

9:06 am-4:36 pm

1 stop6h 30m

$227

St. LouisColorado Springs

STL - COS

STLCOS

Lambert-St Louis

Thu 3/20

5:45 am-10:10 am

1 stop5h 25m

Colorado Springs

Tue 3/25

4:20 pm-10:25 pm

1 stop5h 05m

$267

St. LouisColorado Springs

STL - COS

STLCOS

Lambert-St Louis

Mon 3/17

5:33 pm-11:59 pm

2 stops7h 26m

Colorado Springs

Wed 3/19

7:30 am-12:49 pm

1 stop4h 19m

$272

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Tue 3/25

1:45 pm-3:14 pm

Nonstop2h 29m

Denver Intl

Wed 4/2

6:44 pm-9:50 pm

Nonstop2h 06m

$280

St. LouisColorado Springs

STL - COS

STLCOS

Lambert-St Louis

Fri 4/4

5:26 am-9:52 am

1 stop5h 26m

Colorado Springs

Mon 4/7

4:39 pm-10:28 pm

1 stop4h 49m

$287

St. LouisGunnison

STL - GUC

STLGUC

Lambert-St Louis

Wed 4/2

1:43 pm-8:10 pm

1 stop7h 27m

Gunnison

Tue 4/8

1:41 pm-9:50 pm

1 stop7h 09m

$289

St. LouisMontrose

STL - MTJ

STLMTJ

Lambert-St Louis

Wed 4/2

4:45 pm-8:30 pm

1 stop4h 45m

Montrose County

Tue 4/8

1:40 pm-9:50 pm

1 stop7h 10m

$291

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/3

Showing 1-10 of 40 results
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2
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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.

Travel insights for flights from St. Louis to Colorado

Get recent, data-driven insights about flights from St. Louis to Colorado including ideal travel times, pricing trends, and more.

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 March 3, 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 March 3, 2025.
Read through reviews of airlines operating flights from St. Louis to Colorado, such as Southwest, Alaska Airlines and Delta. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,333 reviews

Crew

8.7

Boarding

8.2

Entertainment

7.6

Food

7.1

Comfort

8.1

Overall

8.1

Reviews

1 / 20

2.0
Mediocre

Steven,Feb 2025

BZN - DEN

Bozeman Airport knows how to deal with snow. I saw many airlines leave with only small delays due to the foot of snow. Our plane was 4 hours delayed. I missed my connection in Denver with a 3.5 hour layover. Because of that, the best you Southwest could do was make me wait more hours, them send me to Chicago Midway, where I had to wait overnight, for 7 more hours until a flight to RSW was available. Nobody at Southwest told me that Midway shuts down after 8pm. Everything was closed. I had no idea. You just dumped me there. I am a 65 year old man and you dumped me in Midway without even a couch to lie on. I was awake 21 hours because of this. No, it was not an act of God. Other airlines were moving passengers out. It was incompetence Shame on you.

Southwest
8.1
Very good
4,333 reviews
Southwest
8.1
Very good
4,333 reviews

Crew

8.7

Boarding

8.2

Entertainment

7.6

Food

7.1

Comfort

8.1

Overall

8.1

Reviews

1 / 20

2.0
Mediocre

Steven,Feb 2025

BZN - DEN

Bozeman Airport knows how to deal with snow. I saw many airlines leave with only small delays due to the foot of snow. Our plane was 4 hours delayed. I missed my connection in Denver with a 3.5 hour layover. Because of that, the best you Southwest could do was make me wait more hours, them send me to Chicago Midway, where I had to wait overnight, for 7 more hours until a flight to RSW was available. Nobody at Southwest told me that Midway shuts down after 8pm. Everything was closed. I had no idea. You just dumped me there. I am a 65 year old man and you dumped me in Midway without even a couch to lie on. I was awake 21 hours because of this. No, it was not an act of God. Other airlines were moving passengers out. It was incompetence Shame on you.

Alaska Airlines
8.0
Very good
9,710 reviews
Southwest
8.1
Very good
4,333 reviews

Crew

8.7

Boarding

8.2

Entertainment

7.6

Food

7.1

Comfort

8.1

Overall

8.1

Reviews

1 / 20

2.0
Mediocre

Steven,Feb 2025

BZN - DEN

Bozeman Airport knows how to deal with snow. I saw many airlines leave with only small delays due to the foot of snow. Our plane was 4 hours delayed. I missed my connection in Denver with a 3.5 hour layover. Because of that, the best you Southwest could do was make me wait more hours, them send me to Chicago Midway, where I had to wait overnight, for 7 more hours until a flight to RSW was available. Nobody at Southwest told me that Midway shuts down after 8pm. Everything was closed. I had no idea. You just dumped me there. I am a 65 year old man and you dumped me in Midway without even a couch to lie on. I was awake 21 hours because of this. No, it was not an act of God. Other airlines were moving passengers out. It was incompetence Shame on you.

Delta
8.0
Very good
8,068 reviews
Southwest
8.1
Very good
4,333 reviews

Crew

8.7

Boarding

8.2

Entertainment

7.6

Food

7.1

Comfort

8.1

Overall

8.1

Reviews

1 / 20

2.0
Mediocre

Steven,Feb 2025

BZN - DEN

Bozeman Airport knows how to deal with snow. I saw many airlines leave with only small delays due to the foot of snow. Our plane was 4 hours delayed. I missed my connection in Denver with a 3.5 hour layover. Because of that, the best you Southwest could do was make me wait more hours, them send me to Chicago Midway, where I had to wait overnight, for 7 more hours until a flight to RSW was available. Nobody at Southwest told me that Midway shuts down after 8pm. Everything was closed. I had no idea. You just dumped me there. I am a 65 year old man and you dumped me in Midway without even a couch to lie on. I was awake 21 hours because of this. No, it was not an act of God. Other airlines were moving passengers out. It was incompetence Shame on you.

United Airlines
7.4
Good
8,679 reviews
Southwest
8.1
Very good
4,333 reviews

Crew

8.7

Boarding

8.2

Entertainment

7.6

Food

7.1

Comfort

8.1

Overall

8.1

Reviews

1 / 20

2.0
Mediocre

Steven,Feb 2025

BZN - DEN

Bozeman Airport knows how to deal with snow. I saw many airlines leave with only small delays due to the foot of snow. Our plane was 4 hours delayed. I missed my connection in Denver with a 3.5 hour layover. Because of that, the best you Southwest could do was make me wait more hours, them send me to Chicago Midway, where I had to wait overnight, for 7 more hours until a flight to RSW was available. Nobody at Southwest told me that Midway shuts down after 8pm. Everything was closed. I had no idea. You just dumped me there. I am a 65 year old man and you dumped me in Midway without even a couch to lie on. I was awake 21 hours because of this. No, it was not an act of God. Other airlines were moving passengers out. It was incompetence Shame on you.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,333 reviews

Crew

8.7

Boarding

8.2

Entertainment

7.6

Food

7.1

Comfort

8.1

Overall

8.1

Reviews

1 / 20

2.0
Mediocre

Steven,Feb 2025

BZN - DEN

Bozeman Airport knows how to deal with snow. I saw many airlines leave with only small delays due to the foot of snow. Our plane was 4 hours delayed. I missed my connection in Denver with a 3.5 hour layover. Because of that, the best you Southwest could do was make me wait more hours, them send me to Chicago Midway, where I had to wait overnight, for 7 more hours until a flight to RSW was available. Nobody at Southwest told me that Midway shuts down after 8pm. Everything was closed. I had no idea. You just dumped me there. I am a 65 year old man and you dumped me in Midway without even a couch to lie on. I was awake 21 hours because of this. No, it was not an act of God. Other airlines were moving passengers out. It was incompetence Shame on you.

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 213 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 $39. Users have also found prices from $99 and $104 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 - Colorado Springs or Lambert-St Louis - Durango La Plata 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 Frontier (85%), Air Canada (79%) and United Airlines (71%).

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

    The cheapest flight price from St. Louis to Colorado is $44. On average you can expect to pay $634. The most popular route, (Lambert-St Louis - Denver Intl), can usually be booked for $167.

  • 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 March 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$44Average$113FlexibilityNo cancel feeOn-time62%
DeltaCheapest$131Average$296FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$150Average$521FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$178Average$483FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$192Average$428FlexibilityNo cancel feeOn-time71%
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