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$32+ 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 3/8. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — STL
janv. 26 — févr. 21
dim. 1/26
dim. 2/2
1 adult, Economy
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Cheap flight deals from Colorado to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Colorado (USCO) to St. Louis (STL). 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 janvier 21, 2025.

Round-trip from

$58
(Frontier)

One-way from

$32
(Trip.com)

Good round-trip deal

$152 or less

Good one-way deal

$107 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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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 janvier 21, 2025.

This Frontier deal was found by Cheapflights users on 1/21. 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.
mer. 2/56:00 amDEN - STL
Nonstop2h 16mFrontier
sam. 2/87:09 pmSTL - DEN
Nonstop2h 28mFrontier
Deal found 1/21$58
This American Airlines deal was found by Cheapflights users on 1/20. 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.
mer. 3/56:30 amDEN - STL
1 stop7h 22mAmerican Airlines
mer. 3/54:20 pmSTL - DEN
1 stop8h 00mAmerican Airlines
Deal found 1/20$194
This Southwest deal was found by Cheapflights users on 1/20. 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.
mer. 2/199:50 amDEN - STL
Nonstop2h 05mSouthwest
jeu. 2/208:15 pmSTL - DEN
Nonstop2h 30mSouthwest
Deal found 1/20$232
This Delta deal was found by Cheapflights users on 1/21. 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. 2/43:30 pmDEN - STL
1 stop7h 06mDelta
mar. 2/1110:59 amSTL - DEN
1 stop5h 50mDelta
Deal found 1/21$237
This Travelocity deal was found by Cheapflights users on 1/21. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven. 2/76:00 amDEN - STL
Nonstop2h 16mMultiple Airlines
mar. 2/112:49 pmSTL - DEN
1 stop8h 47mMultiple Airlines
Deal found 1/21$245
This Southwest deal was found by Cheapflights users on 1/21. 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.
jeu. 2/136:30 amCOS - STL
1 stop4h 05mSouthwest
mer. 2/197:50 amSTL - COS
1 stop7h 35mSouthwest
Deal found 1/21$267
This United deal was found by Cheapflights users on 1/20. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 2/117:45 amDEN - STL
1 stop5h 29mUnited Airlines
mar. 2/188:20 amSTL - DEN
Nonstop2h 33mUnited Airlines
Deal found 1/20$267
This American Airlines deal was found by Cheapflights users on 1/21. 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.
jeu. 2/1310:35 amCOS - STL
1 stop4h 58mAmerican Airlines
mer. 2/199:15 amSTL - COS
1 stop7h 35mAmerican Airlines
Deal found 1/21$310
This deal was found by Cheapflights users on 1/21. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 2/136:00 amCOS - STL
2 stops7h 36mUnited Airlines
mer. 2/1910:18 amSTL - COS
2 stops9h 52mUnited Airlines
Deal found 1/21$318
This deal was found by Cheapflights users on 1/21. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 2/138:20 amCOS - STL
2 stops12h 57mDelta
mer. 2/196:43 amSTL - COS
2 stops15h 22mDelta
Deal found 1/21$323
This United Airlines deal was found by Cheapflights users on 1/20. 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.
mer. 3/197:15 amMTJ - STL
1 stop4h 34mUnited Airlines
mer. 3/266:15 amSTL - MTJ
1 stop6h 16mUnited Airlines
Deal found 1/20$367
This United Airlines deal was found by Cheapflights users on 1/20. 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.
mer. 2/57:00 amGJT - STL
1 stop4h 48mUnited Airlines
dim. 2/94:36 pmSTL - GJT
1 stop4h 53mUnited Airlines
Deal found 1/20$409

Find flights from Colorado to St. Louis within your budget

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 janvier 21, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

mer. 2/5

6:00 am-9:16 am

Nonstop2h 16m

Lambert-St Louis

sam. 2/8

7:09 pm-8:37 pm

Nonstop2h 28m

$58

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

mer. 3/5

6:30 am-2:52 pm

1 stop7h 22m

Lambert-St Louis

mer. 3/5

4:20 pm-11:20 pm

1 stop8h 00m

$194

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

mer. 2/19

9:50 am-12:55 pm

Nonstop2h 05m

Lambert-St Louis

jeu. 2/20

8:15 pm-9:45 pm

Nonstop2h 30m

$232

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

mar. 2/4

3:30 pm-11:36 pm

1 stop7h 06m

Lambert-St Louis

mar. 2/11

10:59 am-3:49 pm

1 stop5h 50m

$237

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

ven. 2/7

6:00 am-9:16 am

Nonstop2h 16m

Lambert-St Louis

mar. 2/11

2:49 pm-10:36 pm

1 stop8h 47m

$245

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

mar. 2/11

7:45 am-2:14 pm

1 stop5h 29m

Lambert-St Louis

mar. 2/18

8:20 am-9:53 am

Nonstop2h 33m

$267

Colorado SpringsSt. Louis

COS - STL

COSSTL

Colorado Springs

jeu. 2/13

6:30 am-11:35 am

1 stop4h 05m

Lambert-St Louis

mer. 2/19

7:50 am-2:25 pm

1 stop7h 35m

$267

Colorado SpringsSt. Louis

COS - STL

COSSTL

Colorado Springs

jeu. 2/13

10:35 am-4:33 pm

1 stop4h 58m

Lambert-St Louis

mer. 2/19

9:15 am-3:50 pm

1 stop7h 35m

$310

Colorado SpringsSt. Louis

COS - STL

COSSTL

Colorado Springs

jeu. 2/13

6:00 am-2:36 pm

2 stops7h 36m

Lambert-St Louis

mer. 2/19

10:18 am-7:10 pm

2 stops9h 52m

$318

Colorado SpringsSt. Louis

COS - STL

COSSTL

Colorado Springs

jeu. 2/13

8:20 am-10:17 pm

2 stops12h 57m

Lambert-St Louis

mer. 2/19

6:43 am-9:05 pm

2 stops15h 22m

$323

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/21

Showing 1-10 of 30 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.

Travel insights for flights from Colorado to St. Louis

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

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 janvier 21, 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 janvier 21, 2025.

The most flights from USCO to STL are scheduled on a Wednesday (13 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (10 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 janvier 21, 2025.
Read reviews from past customers who have flown Frontier, Delta and United Airlines 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.
Southwest
8.1
Very good
4,662 reviews

Comfort

8.1

Food

7.2

Crew

8.7

Entertainment

7.7

Overall

8.1

Boarding

8.2

Reviews

1 / 10

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
4,662 reviews
Southwest
8.1
Very good
4,662 reviews

Comfort

8.1

Food

7.2

Crew

8.7

Entertainment

7.7

Overall

8.1

Boarding

8.2

Reviews

1 / 10

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
9,706 reviews
Southwest
8.1
Very good
4,662 reviews

Comfort

8.1

Food

7.2

Crew

8.7

Entertainment

7.7

Overall

8.1

Boarding

8.2

Reviews

1 / 10

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
8,521 reviews
Southwest
8.1
Very good
4,662 reviews

Comfort

8.1

Food

7.2

Crew

8.7

Entertainment

7.7

Overall

8.1

Boarding

8.2

Reviews

1 / 10

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
8,984 reviews
Southwest
8.1
Very good
4,662 reviews

Comfort

8.1

Food

7.2

Crew

8.7

Entertainment

7.7

Overall

8.1

Boarding

8.2

Reviews

1 / 10

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
4,662 reviews

Comfort

8.1

Food

7.2

Crew

8.7

Entertainment

7.7

Overall

8.1

Boarding

8.2

Reviews

1 / 10

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 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 30 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 ($32), Southwest ($79), and United Airlines ($89).

  • 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 Air Canada (90%), United Airlines (89%) and Southwest (79%).

  • 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 $215, our data indicates the cheapest price to be $27. The most popular route (Denver Intl - Lambert-St Louis), is priced around $106.

  • 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
Fenton
Fairview Heights
Maryland Heights
Collinsville
Wentzville
Eureka
St. Peters
Festus
Alton
Farmington
Chesterfield

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Alternative routes for Colorado to St. Louis

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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 janvier 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$48Average$145FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$140Average$332FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$149Average$473FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$212Average$389FlexibilityNo cancel feeOn-time71%
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