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$36+ 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 4/23. Fares are subject to change and may not be available on all flights or dates of travel.
STL — DEN
feb. 4 — feb. 111
mar. 2/4
mar. 2/11
1 adult, Economy
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Cheap flight deals from St. Louis to Colorado

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Colorado (USCO). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated enero 30, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$57
(Cheapflightsfares)

One-way from

$36
(Frontier)

Popular in

December

Cheapest in

April

Average price

$170

Good round-trip deal

$177 or less

Good one-way deal

$113 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. 12% potential increase in price ($22 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in January 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 enero 30, 2025.

This Kiwi.com deal was found by Cheapflights users on 1/30. 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.
sáb. 5/106:53 pmSTL - DEN
Nonstop2h 29mFrontier
sáb. 5/176:00 amDEN - STL
Nonstop2h 09mFrontier
Deal found 1/30$71
This Delta deal was found by Cheapflights users on 1/29. 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.
mar. 4/111:19 amSTL - DEN
1 stop6h 39mDelta
mié. 4/912:15 pmDEN - STL
1 stop7h 49mDelta
Deal found 1/29$185
This CheapOair deal was found by Cheapflights users on 1/30. 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.
sáb. 3/157:03 pmSTL - DEN
Nonstop2h 28mMultiple Airlines
jue. 3/206:55 pmDEN - STL
1 stop15h 39mMultiple Airlines
Deal found 1/30$236
This Southwest deal was found by Cheapflights users on 1/30. 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.
mar. 3/117:25 pmSTL - DEN
1 stop4h 50mSouthwest
jue. 3/139:55 pmDEN - STL
Nonstop2h 00mSouthwest
Deal found 1/30$241
This United Airlines deal was found by Cheapflights users on 1/30. 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. 5/31:41 pmSTL - COS
1 stop5h 57mUnited Airlines
lun. 5/53:40 pmCOS - STL
1 stop4h 21mUnited Airlines
Deal found 1/30$299
This Southwest deal was found by Cheapflights users on 1/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 4/175:35 amSTL - COS
1 stop9h 00mSouthwest
lun. 4/215:05 pmCOS - STL
1 stop6h 30mSouthwest
Deal found 1/28$302
This American Airlines deal was found by Cheapflights users on 1/30. 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.
sáb. 3/17:15 amSTL - GJT
1 stop5h 59mAmerican Airlines
vie. 3/73:21 pmGJT - STL
1 stop7h 28mAmerican Airlines
Deal found 1/30$309
This Delta deal was found by Cheapflights users on 1/28. 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.
lun. 4/213:30 pmSTL - GJT
2 stops8h 00mDelta
sáb. 4/265:56 amGJT - STL
1 stop6h 25mDelta
Deal found 1/28$329
This United Airlines deal was found by Cheapflights users on 1/30. 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. 3/16:30 amSTL - GJT
2 stops7h 08mUnited Airlines
vie. 3/75:30 amGJT - STL
2 stops8h 03mUnited Airlines
Deal found 1/30$369
This Southwest deal was found by Cheapflights users on 1/29. 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.
vie. 3/285:40 amSTL - HDN
1 stop8h 50mSouthwest
dom. 3/305:30 pmHDN - STL
1 stop6h 20mSouthwest
Deal found 1/29$377
This American Airlines deal was found by Cheapflights users on 1/29. 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.
dom. 5/45:26 amSTL - MTJ
1 stop7h 01mAmerican Airlines
vie. 5/911:52 amMTJ - STL
1 stop6h 37mAmerican Airlines
Deal found 1/29$385
This United Airlines deal was found by Cheapflights users on 1/30. 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. 3/15:36 pmSTL - EGE
1 stop5h 23mUnited Airlines
vie. 3/71:43 pmEGE - STL
1 stop6h 51mUnited Airlines
Deal found 1/30$394

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 enero 30, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

sáb. 2/22

7:04 pm-8:32 pm

Nonstop2h 28m

Denver Intl

vie. 2/28

6:00 am-9:16 am

Nonstop2h 16m

$68

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

mar. 4/8

3:30 pm-8:02 pm

1 stop5h 32m

Denver Intl

mar. 4/15

6:05 am-3:12 pm

1 stop8h 07m

$185

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

mar. 3/4

7:20 am-8:55 am

Nonstop2h 35m

Denver Intl

sáb. 3/8

9:15 pm-12:15 am

Nonstop2h 00m

$211

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

jue. 2/27

1:39 pm-3:10 pm

Nonstop2h 31m

Denver Intl

lun. 3/3

5:40 pm-8:44 pm

Nonstop2h 04m

$251

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

vie. 4/18

3:11 pm-11:58 pm

1 stop9h 47m

Denver Intl

lun. 4/21

6:00 am-9:06 am

Nonstop2h 06m

$275

St. LouisColorado Springs

STL - COS

STLCOS

Lambert-St Louis

jue. 4/17

5:35 am-1:35 pm

1 stop9h 00m

Colorado Springs

lun. 4/21

5:05 pm-12:35 am

1 stop6h 30m

$302

St. LouisGrand Junction

STL - GJT

STLGJT

Lambert-St Louis

sáb. 3/1

7:15 am-12:14 pm

1 stop5h 59m

Grand Junction Regnl

vie. 3/7

3:21 pm-11:49 pm

1 stop7h 28m

$309

St. LouisGrand Junction

STL - GJT

STLGJT

Lambert-St Louis

lun. 4/21

3:30 pm-10:30 pm

2 stops8h 00m

Grand Junction Regnl

sáb. 4/26

5:56 am-1:21 pm

1 stop6h 25m

$314

St. LouisHayden

STL - HDN

STLHDN

Lambert-St Louis

jue. 3/20

8:20 am-2:30 pm

1 stop7h 10m

Hayden Yampa Valley

mié. 3/26

1:45 pm-9:34 pm

1 stop6h 49m

$317

St. LouisColorado Springs

STL - COS

STLCOS

Lambert-St Louis

mar. 3/11

6:15 am-11:21 am

1 stop6h 06m

Colorado Springs

mar. 3/11

3:35 pm-8:34 pm

1 stop3h 59m

$341

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/30

Showing 1-10 of 42 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.

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 enero 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.

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 enero 30, 2025.

The most flights from STL to USCO are scheduled on a Monday (13 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 enero 30, 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
4,585 reviews

Food

7.1

Overall

8.1

Crew

8.7

Entertainment

7.7

Boarding

8.2

Comfort

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Southwest
8.1
Very good
4,585 reviews
Southwest
8.1
Very good
4,585 reviews

Food

7.1

Overall

8.1

Crew

8.7

Entertainment

7.7

Boarding

8.2

Comfort

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Alaska Airlines
8.0
Very good
9,686 reviews
Southwest
8.1
Very good
4,585 reviews

Food

7.1

Overall

8.1

Crew

8.7

Entertainment

7.7

Boarding

8.2

Comfort

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Delta
8.0
Very good
8,450 reviews
Southwest
8.1
Very good
4,585 reviews

Food

7.1

Overall

8.1

Crew

8.7

Entertainment

7.7

Boarding

8.2

Comfort

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

United Airlines
7.4
Good
8,906 reviews
Southwest
8.1
Very good
4,585 reviews

Food

7.1

Overall

8.1

Crew

8.7

Entertainment

7.7

Boarding

8.2

Comfort

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,585 reviews

Food

7.1

Overall

8.1

Crew

8.7

Entertainment

7.7

Boarding

8.2

Comfort

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

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 226 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 $36. Users have also found prices from $79 and $93 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 - Vail Eagle 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 Frontier (87%), Southwest (77%) and United Airlines (64%).

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

    The cheapest flight price from St. Louis to Colorado is $54. On average you can expect to pay $624. The most popular route, (Lambert-St Louis - Denver Intl), can usually be booked for $78.

  • 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 enero 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$45Average$117FlexibilityNo cancel feeOn-time62%
DeltaCheapest$131Average$291FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$149Average$536FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$177Average$455FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$192Average$420FlexibilityNo cancel feeOn-time71%
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