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St. Louis

$75+ 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 7/9. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — STL
Jul 8 — Jul 151
Tue 7/8
Tue 7/15
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 July 3, 2025.

Round-trip from

$136
(Frontier)

One-way from

$75
(Frontier)

Popular in

June

Cheapest in

January

Average price

$193

Good round-trip deal

$199 or less

Good one-way deal

$150 or less
From Colorado to Lambert-St Louis
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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 ($16 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).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from Colorado to Lambert-St Louis.
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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 July 3, 2025.

This Kiwi.com deal was found by Cheapflights users on 7/3. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/88:44 pmDEN - STL
1 stop11h 08mFrontier
Sat 10/117:52 pmSTL - DEN
Nonstop2h 28mFrontier
Deal found 7/3$135
This Southwest deal was found by Cheapflights users on 7/3. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/57:10 amDEN - STL
Nonstop2h 00mSouthwest
Mon 8/114:25 pmSTL - DEN
1 stop4h 50mSouthwest
Deal found 7/3$167
This Southwest deal was found by Cheapflights users on 7/2. 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.
Tue 8/266:45 amCOS - STL
1 stop3h 45mSouthwest
Thu 8/285:25 amSTL - COS
1 stop4h 45mSouthwest
Deal found 7/2$217
This Delta deal was found by Cheapflights users on 7/2. 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.
Mon 8/115:55 pmCOS - STL
1 stop5h 43mDelta
Sat 8/163:36 pmSTL - COS
1 stop6h 05mDelta
Deal found 7/2$234
This American Airlines deal was found by Cheapflights users on 7/3. 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.
Thu 9/48:12 amEGE - STL
1 stop5h 57mAmerican Airlines
Tue 9/97:16 amSTL - EGE
1 stop5h 28mAmerican Airlines
Deal found 7/3$237
This American Airlines deal was found by Cheapflights users on 7/3. 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.
Thu 9/412:16 pmASE - STL
1 stop5h 07mAmerican Airlines
Tue 9/97:16 amSTL - ASE
1 stop5h 26mAmerican Airlines
Deal found 7/3$237
This Southwest deal was found by Cheapflights users on 6/30. 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.
Tue 11/412:05 pmMTJ - STL
1 stop5h 25mSouthwest
Tue 11/115:35 amSTL - MTJ
1 stop6h 45mSouthwest
Deal found 6/30$237
This American Airlines deal was found by Cheapflights users on 7/3. 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.
Wed 8/65:24 pmCOS - STL
1 stop4h 50mAmerican Airlines
Thu 8/710:08 amSTL - COS
1 stop7h 09mAmerican Airlines
Deal found 7/3$248
This American Airlines deal was found by Cheapflights users on 7/3. 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.
Thu 9/411:46 amGJT - STL
1 stop5h 14mAmerican Airlines
Tue 9/93:59 pmSTL - GJT
1 stop6h 10mAmerican Airlines
Deal found 7/3$249
This American Airlines deal was found by Cheapflights users on 7/2. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/298:10 amDRO - STL
1 stop7h 13mAmerican Airlines
Sun 11/22:43 pmSTL - DRO
1 stop7h 29mAmerican Airlines
Deal found 7/2$290
This American Airlines deal was found by Cheapflights users on 7/2. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/302:37 pmMTJ - STL
1 stop4h 54mAmerican Airlines
Sun 8/35:30 amSTL - MTJ
1 stop5h 14mAmerican Airlines
Deal found 7/2$291
This United Airlines deal was found by Cheapflights users on 7/1. 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.
Tue 7/156:35 pmCOS - STL
1 stop4h 24mUnited Airlines
Tue 9/26:35 amSTL - COS
1 stop5h 21mUnited Airlines
Deal found 7/1$302

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 July 3, 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

Wed 8/6

6:00 am-9:11 am

Nonstop2h 11m

Lambert-St Louis

Wed 8/13

7:29 pm-8:58 pm

Nonstop2h 29m

$135

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Thu 8/7

5:30 am-8:30 am

Nonstop2h 00m

Lambert-St Louis

Tue 8/12

10:45 am-4:05 pm

2 stops6h 20m

$168

Colorado SpringsSt. Louis

COS - STL

COSSTL

Colorado Springs

Tue 8/26

6:45 am-11:30 am

1 stop3h 45m

Lambert-St Louis

Thu 8/28

5:25 am-9:10 am

1 stop4h 45m

$217

Colorado SpringsSt. Louis

COS - STL

COSSTL

Colorado Springs

Mon 8/11

5:55 pm-12:38 am

1 stop5h 43m

Lambert-St Louis

Sat 8/16

3:36 pm-8:41 pm

1 stop6h 05m

$234

VailSt. Louis

EGE - STL

EGESTL

Vail Eagle County

Thu 9/4

8:12 am-3:09 pm

1 stop5h 57m

Lambert-St Louis

Tue 9/9

7:16 am-11:44 am

1 stop5h 28m

$237

AspenSt. Louis

ASE - STL

ASESTL

Aspen Pitkin County

Thu 9/4

12:16 pm-6:23 pm

1 stop5h 07m

Lambert-St Louis

Tue 9/9

7:16 am-11:42 am

1 stop5h 26m

$237

MontroseSt. Louis

MTJ - STL

MTJSTL

Montrose County

Tue 11/4

12:05 pm-6:30 pm

1 stop5h 25m

Lambert-St Louis

Tue 11/11

5:35 am-11:20 am

1 stop6h 45m

$237

Colorado SpringsSt. Louis

COS - STL

COSSTL

Colorado Springs

Wed 8/6

5:24 pm-11:14 pm

1 stop4h 50m

Lambert-St Louis

Thu 8/7

10:08 am-4:17 pm

1 stop7h 09m

$248

Grand JunctionSt. Louis

GJT - STL

GJTSTL

Grand Junction Regnl

Thu 9/4

11:46 am-6:00 pm

1 stop5h 14m

Lambert-St Louis

Tue 9/9

3:59 pm-9:09 pm

1 stop6h 10m

$249

DurangoSt. Louis

DRO - STL

DROSTL

Durango La Plata County

Wed 10/29

8:10 am-4:23 pm

1 stop7h 13m

Lambert-St Louis

Sun 11/2

2:43 pm-9:12 pm

1 stop7h 29m

$290

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

Showing 1-10 of 43 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 July 3, 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 July 3, 2025.

The most flights from USCO to STL are scheduled on a Wednesday (17 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (4 on average).

How much does it cost to fly round-trip from Colorado to St. Louis?

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 July 3, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest, and Delta from Colorado to St. Louis by reading reviews from past customers. 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

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Entertainment

7.1

Overall

8.0

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

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Entertainment

7.1

Overall

8.0

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
4,266 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Entertainment

7.1

Overall

8.0

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
7,982 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Entertainment

7.1

Overall

8.0

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
8,861 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Entertainment

7.1

Overall

8.0

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

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Entertainment

7.1

Overall

8.0

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 29 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 ($75), 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 (91%), United Airlines (75%) and Air Canada (68%).

  • 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 $248, our data indicates the cheapest price to be $78. The most popular route (Denver Intl - Lambert-St Louis), is priced around $145.

  • 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
Alton
Festus
Chesterfield
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 July 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$45Average$149FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$150Average$436FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$177Average$336FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$266Average$404FlexibilityNo cancel feeOn-time71%

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