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$64+ 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 10/24. Fares are subject to change and may not be available on all flights or dates of travel.
STL — DEN
oct. 11 — oct. 181
sáb. 10/11
sáb. 10/18
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 septiembre 11, 2025.

Round-trip from

$84
(Frontier)

One-way from

$64
(Cheapflightsfares)

Popular in

March

Cheapest in

September

Average price

$158

Good round-trip deal

$167 or less

Good one-way deal

$118 or less
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. 13% potential increase in price ($32 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($11 potential savings vs. average RT price).
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Average for round-trip flights in September 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 septiembre 11, 2025.

This Frontier deal was found by Cheapflights users on 9/10. 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.
mié. 11/57:45 pmSTL - DEN
Nonstop2h 28mFrontier
sáb. 11/156:00 amDEN - STL
Nonstop2h 07mFrontier
Deal found 9/10$84
This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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.
vie. 10/247:52 pmSTL - DEN
Nonstop2h 28mFrontier
dom. 10/266:00 amDEN - STL
Nonstop2h 07mFrontier
Deal found 9/10$89
This Priceline deal was found by Cheapflights users on 9/8. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/217:52 pmSTL - DEN
Nonstop2h 28mFrontier
jue. 10/236:00 amDEN - STL
Nonstop2h 07mFrontier
Deal found 9/8$90
This Kiwi.com deal was found by Cheapflights users on 9/9. 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.
vie. 11/77:45 pmSTL - DEN
Nonstop2h 28mFrontier
dom. 11/96:00 amDEN - STL
Nonstop2h 07mFrontier
Deal found 9/9$91
This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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.
lun. 10/207:52 pmSTL - DEN
Nonstop2h 28mFrontier
jue. 10/306:00 amDEN - STL
Nonstop2h 07mFrontier
Deal found 9/10$93
This Frontier deal was found by Cheapflights users on 9/10. 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.
dom. 10/57:55 pmSTL - DEN
Nonstop2h 25mFrontier
mar. 10/76:00 amDEN - STL
Nonstop2h 07mFrontier
Deal found 9/10$94
This Kiwi.com deal was found by Cheapflights users on 9/9. 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. 10/47:55 pmSTL - DEN
Nonstop2h 25mFrontier
mar. 10/76:00 amDEN - STL
Nonstop2h 07mFrontier
Deal found 9/9$95
This Kiwi.com deal was found by Cheapflights users on 9/9. 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.
vie. 10/39:35 pmSTL - DEN
1 stop7h 25mFrontier
lun. 10/66:00 amDEN - STL
Nonstop2h 06mFrontier
Deal found 9/9$96
This Cheapflightsfares deal was found by Cheapflights users on 9/9. 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.
mar. 9/307:55 pmSTL - DEN
Nonstop2h 25mFrontier
vie. 10/36:00 amDEN - STL
Nonstop2h 06mFrontier
Deal found 9/9$97
This Frontier deal was found by Cheapflights users on 9/8. 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.
lun. 9/297:55 pmSTL - DEN
Nonstop2h 25mFrontier
jue. 10/96:00 amDEN - STL
Nonstop2h 07mFrontier
Deal found 9/8$98
This Kiwi.com deal was found by Cheapflights users on 9/10. 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.
vie. 10/39:35 pmSTL - DEN
1 stop7h 25mFrontier
mar. 10/76:00 amDEN - STL
Nonstop2h 07mFrontier
Deal found 9/10$99
This Cheapflightsfares deal was found by Cheapflights users on 9/11. 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.
lun. 11/37:45 pmSTL - DEN
Nonstop2h 28mFrontier
vie. 11/76:00 amDEN - STL
Nonstop2h 07mFrontier
Deal found 9/11$101

Cheapflights Fare Finder

 
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 septiembre 11, 2025.
Use the filters below to find and compare flights from St. Louis to Colorado that are best for you.

Fly from

St. Louis

Fly to

Colorado

Route

Depart

Return

Price

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

mar. 12/2

5:35 am-7:00 am

Nonstop2h 25m

Denver Intl

sáb. 12/6

5:00 am-8:05 am

Nonstop2h 05m

$133

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

sáb. 10/25

1:45 pm-6:50 pm

1 stop6h 05m

Denver Intl

mié. 10/29

12:15 pm-5:25 pm

1 stop4h 10m

$148

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

mié. 11/5

6:05 pm-10:40 pm

1 stop5h 35m

Denver Intl

sáb. 11/8

11:55 am-5:00 pm

1 stop4h 05m

$153

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

mié. 10/1

3:45 pm-7:50 pm

1 stop5h 05m

Denver Intl

sáb. 10/4

9:30 am-5:00 pm

1 stop6h 30m

$153

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

lun. 11/3

7:45 pm-9:13 pm

Nonstop2h 28m

Denver Intl

jue. 11/6

12:16 am-1:17 pm

1 stop12h 01m

$166

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

mar. 10/28

8:20 am-11:10 am

1 stop3h 50m

Denver Intl

mar. 10/28

1:00 pm-5:55 pm

1 stop3h 55m

$171

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

mié. 10/8

2:45 pm-5:20 pm

1 stop3h 35m

Denver Intl

mié. 10/15

6:30 pm-9:30 pm

Nonstop2h 00m

$173

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

mié. 10/1

5:32 pm-11:08 pm

1 stop6h 36m

Denver Intl

vie. 10/3

12:59 am-8:44 am

1 stop6h 45m

$197

St. LouisColorado Springs

STL - COS

STLCOS

Lambert-St Louis

mié. 10/15

12:45 pm-9:35 pm

2 stops9h 50m

Colorado Springs

mié. 10/29

1:50 pm-9:50 pm

1 stop7h 00m

$204

St. LouisColorado Springs

STL - COS

STLCOS

Lambert-St Louis

jue. 11/6

7:05 am-12:11 pm

1 stop6h 06m

Colorado Springs

sáb. 11/8

5:49 pm-8:16 am

2 stops13h 27m

$222

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 57 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.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Colorado

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 septiembre 11, 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 septiembre 11, 2025.

The most flights from STL to USCO 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 (6 on average).

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 septiembre 11, 2025.
Peruse reviews from past customers who have flown with Southwest, Delta, and United Airlines from St. Louis to Colorado to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Southwest
8.0
Very good
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Delta
8.0
Very good
7,960 reviews
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
United Airlines
7.4
Good
8,937 reviews
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Frontier
5.8
Fair
3,177 reviews
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

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 186 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from St. Louis to Colorado?

    Airlines like Southwest, Delta, and United Airlines fly from St. Louis to Colorado in about 2h 25m. The time it takes to get you to your destination can typically vary by up to 4h 15m. The distance between St. Louis and Colorado is about 767 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from St. Louis to Colorado one-way?

    For one-way options, check prices for United Airlines. According to our data, you can fly for as low as $67. Users have also found prices from $69 and $73 on Frontier and Southwest, 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 - Grand Junction Regnl 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 SkyWest Airlines (89%), Air Canada (66%) and Southwest (63%).

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

    The cheapest flight price from St. Louis to Colorado is $69. On average you can expect to pay $443. The most popular route, (Lambert-St Louis - Denver Intl), can usually be booked for $110.

  • 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 septiembre 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$53Average$127FlexibilityNo cancel feeOn-time62%
DeltaCheapest$128Average$306FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$154Average$461FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$175Average$332FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$201Average$392FlexibilityNo cancel feeOn-time71%

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