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St. Louis

$73+ Cheap flights from Colorado to St. Louis (STL)

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 9/13. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — STL
Jun 21 — Jun 281
Sat 6/21
Sat 6/28
1 adult, Economy
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Cheap flight deals from Colorado to St. Louis

Keep the following information in mind while searching for Colorado to St. Louis flight deals. Data was last updated June 16, 2025.

Round-trip from

$146
(Cheapflightsfares)

One-way from

$73
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$277

Good round-trip deal

$186 or less

Good one-way deal

$131 or less
From Colorado to Lambert-St Louis
Search Deals
One-way flight from Colorado to Lambert-St Louis
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Highest demand for flights based on searches. 6% potential increase in price ($14 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2025
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Price to beat on a round-trip flight from Colorado to Lambert-St Louis.
Search Deals
Price to beat on a one-way flight from Colorado to Lambert-St Louis.
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Find flight deals from Colorado to St. Louis

Cheapest flights from Colorado to St. Louis
Explore the most affordable flight options available from Colorado to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 16, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 6/14. 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.
Mon 7/146:00 amDEN - STL
Nonstop2h 11mFrontier
Wed 7/167:29 pmSTL - DEN
Nonstop2h 29mFrontier
Deal found 6/14$146
This Southwest deal was found by Cheapflights users on 6/15. 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 11/68:30 pmDEN - STL
Nonstop2h 00mSouthwest
Mon 11/105:30 amSTL - DEN
Nonstop2h 20mSouthwest
Deal found 6/15$157
This American Airlines deal was found by Cheapflights users on 6/14. 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 9/2411:59 pmDEN - STL
1 stop7h 06mAmerican Airlines
Mon 9/293:57 pmSTL - DEN
1 stop6h 04mAmerican Airlines
Deal found 6/14$177
This Delta deal was found by Cheapflights users on 6/14. 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.
Mon 8/113:45 pmDEN - STL
1 stop7h 53mDelta
Sat 8/166:00 amSTL - DEN
1 stop4h 58mDelta
Deal found 6/14$197
This Delta deal was found by Cheapflights users on 6/15. 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.
Mon 8/45:55 pmCOS - STL
1 stop5h 43mDelta
Mon 8/113:40 pmSTL - COS
1 stop6h 01mDelta
Deal found 6/15$217
This Southwest deal was found by Cheapflights users on 6/15. 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.
Mon 8/45:10 amCOS - STL
1 stop4h 25mSouthwest
Mon 8/119:50 amSTL - COS
2 stops6h 55mSouthwest
Deal found 6/15$222
This United Airlines deal was found by Cheapflights users on 6/14. 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 7/168:40 pmDEN - STL
Nonstop2h 19mUnited Airlines
Tue 7/221:42 pmSTL - DEN
Nonstop2h 17mUnited Airlines
Deal found 6/14$228
This CheapOair deal was found by Cheapflights users on 6/15. 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.
Fri 7/186:00 amDEN - STL
Nonstop2h 11mMultiple Airlines
Sun 7/206:05 amSTL - DEN
1 stop27h 38mMultiple Airlines
Deal found 6/15$233
This American Airlines deal was found by Cheapflights users on 6/15. 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 8/2710:14 amDRO - STL
1 stop5h 33mAmerican Airlines
Sun 8/317:01 amSTL - DRO
1 stop6h 03mAmerican Airlines
Deal found 6/15$238
This American Airlines deal was found by Cheapflights users on 6/14. 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 9/512:23 pmGJT - STL
1 stop5h 04mAmerican Airlines
Tue 9/95:19 amSTL - GJT
1 stop7h 33mAmerican Airlines
Deal found 6/14$249
This American Airlines deal was found by Cheapflights users on 6/14. 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 7/2910:49 amCOS - STL
1 stop7h 42mAmerican Airlines
Tue 8/55:30 amSTL - COS
1 stop5h 21mAmerican Airlines
Deal found 6/14$256
This American Airlines deal was found by Cheapflights users on 6/14. 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 7/110:27 amEGE - STL
1 stop6h 53mAmerican Airlines
Mon 7/75:30 amSTL - EGE
1 stop5h 12mAmerican Airlines
Deal found 6/14$269

Cheapflights Fare Finder

Customize your flight search to find flights from Colorado to St. Louis 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 June 16, 2025.
Use the filters below to find and compare flights from Colorado to St. Louis that are best for you.

Fly from

Colorado

Fly to

St. Louis

Route

Depart

Return

Price

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Mon 7/14

6:00 am-9:11 am

Nonstop2h 11m

Lambert-St Louis

Wed 7/16

7:29 pm-8:58 pm

Nonstop2h 29m

$146

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Thu 11/6

8:30 pm-11:30 pm

Nonstop2h 00m

Lambert-St Louis

Mon 11/10

5:30 am-6:50 am

Nonstop2h 20m

$157

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Wed 9/24

11:59 pm-8:05 am

1 stop7h 06m

Lambert-St Louis

Mon 9/29

3:57 pm-9:01 pm

1 stop6h 04m

$177

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Mon 8/11

3:45 pm-12:38 am

1 stop7h 53m

Lambert-St Louis

Sat 8/16

3:36 pm-8:16 pm

1 stop5h 40m

$197

Colorado SpringsSt. Louis

COS - STL

COSSTL

Colorado Springs

Mon 8/4

5:55 pm-12:38 am

1 stop5h 43m

Lambert-St Louis

Mon 8/11

3:40 pm-8:41 pm

1 stop6h 01m

$217

Colorado SpringsSt. Louis

COS - STL

COSSTL

Colorado Springs

Mon 8/4

5:10 am-10:35 am

1 stop4h 25m

Lambert-St Louis

Mon 8/11

9:50 am-3:45 pm

2 stops6h 55m

$222

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Wed 7/16

8:40 pm-11:59 pm

Nonstop2h 19m

Lambert-St Louis

Tue 7/22

1:42 pm-2:59 pm

Nonstop2h 17m

$228

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Fri 7/18

6:00 am-9:11 am

Nonstop2h 11m

Lambert-St Louis

Sun 7/20

6:05 am-8:43 am

1 stop27h 38m

$233

DurangoSt. Louis

DRO - STL

DROSTL

Durango La Plata County

Wed 8/27

10:14 am-4:47 pm

1 stop5h 33m

Lambert-St Louis

Sun 8/31

7:01 am-12:04 pm

1 stop6h 03m

$238

Grand JunctionSt. Louis

GJT - STL

GJTSTL

Grand Junction Regnl

Fri 9/5

12:23 pm-6:27 pm

1 stop5h 04m

Lambert-St Louis

Tue 9/9

5:19 am-11:52 am

1 stop7h 33m

$249

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/14

Showing 1-10 of 42 results
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Best time to book a flight from Colorado to St. Louis

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

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

Currently, August is the cheapest month in which you can book a flight from Colorado to St. Louis (average of $311). Flying from Colorado to St. Louis in March is currently the most expensive (average of $356). 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 CO to STL?

Find hourly flight availability from Colorado to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 16, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Colorado to St. Louis as you normally would.

Weekly flight availability from Colorado to St. Louis

Explore weekly flight availability from Colorado to St. Louis. 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 June 16, 2025.

The most flights from USCO to STL are scheduled on a Sunday (18 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (14 on average).

Rainfall in St. Louis by month

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

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

Temperature in St. Louis by month

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

If weather is an important factor for your trip to St. Louis, 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 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated June 16, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest and Delta from Colorado to St. Louis. 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

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

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
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

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
4,278 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

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
7,963 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

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
8,801 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

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
10,000 reviews

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

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 Colorado to St. Louis. 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 into for flights to St. Louis from Colorado?

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

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

    This flight path from Colorado to Lambert-St Louis was viewed by 26 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 Colorado to St. Louis one-way?

    The cheapest airlines for a one-way flight from Colorado to St. Louis are Frontier ($73), United Airlines ($79), and Southwest ($84).

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

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

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

    The top 3 most reliable airlines when flying from Colorado to St. Louis are Frontier (89%), Air Canada (71%) and United Airlines (66%).

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

    Looking for the cheapest flight from Colorado to St. Louis? While on average our users pay $241, our data indicates the cheapest price to be $74. The most popular route (Denver Intl - Lambert-St Louis), is priced around $157.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from Colorado to St. Louis (average of $311). Flying from Colorado to St. Louis in March is currently the most expensive (average of $356). 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

Traveling to a place near Colorado?

Book flights to Colorado if you plan to visit one of these locations
O'Fallon
Maryland Heights
Fairview Heights
Collinsville
Eureka
St. Peters
Glencoe
Festus
Alton
Farmington

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Alternative routes for Colorado to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Colorado to St. Louis

Discover the top 4 airlines that operate flights from Colorado to St. Louis. 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 June 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$45Average$148FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$150Average$435FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$177Average$341FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$246Average$394FlexibilityNo cancel feeOn-time71%

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