HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Colorado

$41+ 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 12/20. Fares are subject to change and may not be available on all flights or dates of travel.
STL — DEN
Nov 27 — Dec 41
Thu 11/27
Thu 12/4
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from St. Louis to Colorado with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 October 28, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$81
(Kiwi.com)

One-way from

$41
(Kiwi.com)

Popular in

March

Cheapest in

November

Average price

$175

Good round-trip deal

$181 or less

Good one-way deal

$128 or less
Provider with most accurate pricing for Lambert-St Louis-Denver Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Denver Intl flights.
Search Deals
From Lambert-St Louis to Colorado
Search Deals
One-way flight from Lambert-St Louis to Colorado
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($27 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals
Price to beat on a round-trip flight from Lambert-St Louis to Colorado.
Search Deals
Price to beat on a one-way flight from Lambert-St Louis to Colorado.
Search Deals

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 October 28, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/26. 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 11/127:45 pmSTL - DEN
Nonstop2h 28mFrontier
Sat 11/156:00 amDEN - STL
Nonstop2h 07mFrontier
Deal found 10/26$81
This Frontier deal was found by Cheapflights users on 10/25. 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.
Thu 11/136:22 pmSTL - DEN
1 stop5h 50mFrontier
Sat 11/156:00 amDEN - STL
Nonstop2h 07mFrontier
Deal found 10/25$86
This Frontier deal was found by Cheapflights users on 10/27. 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.
Fri 12/57:43 pmSTL - DEN
Nonstop2h 32mFrontier
Sat 12/67:05 amDEN - STL
Nonstop2h 09mFrontier
Deal found 10/27$88
This CheapOair deal was found by Cheapflights users on 10/27. 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.
Mon 11/172:42 pmSTL - DEN
1 stop14h 17mFrontier
Wed 11/196:00 amDEN - STL
Nonstop2h 07mFrontier
Deal found 10/27$97
This Kiwi.com deal was found by Cheapflights users on 10/26. 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.
Tue 11/117:45 pmSTL - DEN
Nonstop2h 28mFrontier
Wed 11/126:00 amDEN - STL
Nonstop2h 07mFrontier
Deal found 10/26$101
This CheapOair deal was found by Cheapflights users on 10/27. 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.
Sat 12/67:43 pmSTL - DEN
Nonstop2h 32mFrontier
Tue 12/911:59 pmDEN - STL
1 stop21h 34mFrontier
Deal found 10/27$102
This Booking.com deal was found by Cheapflights users on 10/27. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/87:45 pmSTL - DEN
Nonstop2h 28mFrontier
Wed 11/126:00 amDEN - STL
Nonstop2h 07mFrontier
Deal found 10/27$104
This Priceline deal was found by Cheapflights users on 10/27. 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.
Mon 11/109:07 pmSTL - DEN
1 stop7h 52mFrontier
Wed 11/1212:59 amDEN - STL
1 stop8h 13mFrontier
Deal found 10/27$110
This Cheapflightsfares deal was found by Cheapflights users on 10/26. 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.
Fri 11/77:45 pmSTL - DEN
Nonstop2h 28mFrontier
Tue 11/116:00 amDEN - STL
Nonstop2h 07mFrontier
Deal found 10/26$112
This Kiwi.com deal was found by Cheapflights users on 10/26. 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.
Sat 12/137:43 pmSTL - DEN
Nonstop2h 32mFrontier
Sat 12/206:50 amDEN - STL
Nonstop2h 12mFrontier
Deal found 10/26$114
This Delta deal was found by Cheapflights users on 10/28. 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.
Wed 12/246:00 amSTL - HDN
1 stop7h 23mDelta
Sun 12/283:22 pmHDN - STL
1 stop5h 54mDelta
Deal found 10/28$217
This Southwest deal was found by Cheapflights users on 10/27. 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 12/167:40 amSTL - HDN
1 stop4h 35mSouthwest
Mon 12/222:30 pmHDN - STL
1 stop6h 30mSouthwest
Deal found 10/27$224

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 October 28, 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

Fri 12/19

7:43 pm-9:15 pm

Nonstop2h 32m

Denver Intl

Wed 12/24

6:50 am-10:02 am

Nonstop2h 12m

$123

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Thu 11/13

2:12 pm-11:16 pm

1 stop10h 04m

Denver Intl

Sat 11/15

12:16 am-1:17 pm

1 stop12h 01m

$143

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Wed 11/12

7:45 pm-9:13 pm

Nonstop2h 28m

Denver Intl

Thu 11/13

12:16 am-10:20 am

1 stop9h 04m

$165

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Wed 12/10

5:35 am-7:00 am

Nonstop2h 25m

Denver Intl

Sun 12/14

8:30 pm-11:30 pm

Nonstop2h 00m

$197

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Fri 11/21

7:43 pm-9:17 pm

Nonstop2h 34m

Denver Intl

Mon 12/1

6:50 am-10:02 am

Nonstop2h 12m

$203

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Tue 11/25

7:57 pm-9:31 pm

Nonstop2h 34m

Denver Intl

Sat 11/29

6:50 am-10:02 am

Nonstop2h 12m

$208

St. LouisGrand Junction

STL - GJT

STLGJT

Lambert-St Louis

Sat 4/4

4:30 pm-8:27 pm

1 stop4h 57m

Grand Junction Regnl

Tue 4/7

1:20 pm-8:59 pm

1 stop6h 39m

$209

St. LouisGrand Junction

STL - GJT

STLGJT

Lambert-St Louis

Fri 4/3

4:30 pm-8:27 pm

1 stop4h 57m

Grand Junction Regnl

Tue 4/7

1:20 pm-8:59 pm

1 stop6h 39m

$209

St. LouisGunnison

STL - GUC

STLGUC

Lambert-St Louis

Tue 1/20

8:45 am-2:43 pm

1 stop6h 58m

Gunnison

Sat 1/24

1:28 pm-8:58 pm

1 stop6h 30m

$211

St. LouisHayden

STL - HDN

STLHDN

Lambert-St Louis

Tue 3/24

7:30 am-12:55 pm

1 stop6h 25m

Hayden Yampa Valley

Wed 3/25

1:53 pm-8:39 pm

1 stop5h 46m

$217

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/27

Showing 1-10 of 60 results
1
2
3
...
6

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, February is the cheapest month in which you can book a flight from St. Louis to Colorado (average of $36). Flying from St. Louis to Colorado in July is currently the most expensive (average of $104). 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 October 28, 2025.

One of the essential ways to save on airfare from St. Louis to Colorado is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the evening could potentially save you up to 10% on airfare.

What is the cheapest day to fly from St. Louis to Colorado?

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Colorado. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their St. Louis to Colorado flight should consider departing on Saturday evenings when fares are most often at their lowest. Tuesday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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 October 28, 2025.

The most flights from STL to USCO are scheduled on a Monday (15 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (3 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 October 28, 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
4,236 reviews

Overall

8.0

Boarding

8.1

Food

7.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

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
4,236 reviews
Southwest
8.0
Very good
4,236 reviews

Overall

8.0

Boarding

8.1

Food

7.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

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
7.9
Good
7,996 reviews
Southwest
8.0
Very good
4,236 reviews

Overall

8.0

Boarding

8.1

Food

7.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

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
8,997 reviews
Southwest
8.0
Very good
4,236 reviews

Overall

8.0

Boarding

8.1

Food

7.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

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
11,033 reviews
Southwest
8.0
Very good
4,236 reviews

Overall

8.0

Boarding

8.1

Food

7.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

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
3,122 reviews
Southwest
8.0
Very good
4,236 reviews

Overall

8.0

Boarding

8.1

Food

7.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

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 184 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 Frontier, Southwest, 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 16m. 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 $79. Users have also found prices from $79 and $105 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 - Hayden Yampa Valley 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 (90%), Frontier (83%) and Air Canada (78%).

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

    The cheapest flight price from St. Louis to Colorado is $51. On average you can expect to pay $756. The most popular route, (Lambert-St Louis - Denver Intl), can usually be booked for $102.

  • 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, February is the cheapest month in which you can book a flight from St. Louis to Colorado (average of $36). Flying from St. Louis to Colorado in July is currently the most expensive (average of $104). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for St. Louis to Colorado

See prices for flight routes from nearby airports that may be better suited for you.
St. Louis to LaGuardia flights
St. Louis to Las Vegas flights
St. Louis to Newark flights
St. Louis to John F Kennedy Intl flights
St. Louis to Orlando flights
Kansas City to John F Kennedy Intl flights
Kansas City to Las Vegas flights
Kansas City to Denver flights
Kansas City to LaGuardia flights
St. Louis to Sky Harbor Intl flights
Kansas City to Orlando flights
St. Louis to Denver flights
Kansas City to Newark flights
St. Louis to Miami flights
St. Louis to Dallas/Fort Worth flights
St. Louis to Atlanta flights
Kansas City to Atlanta flights
Kansas City to Sky Harbor Intl flights
Kansas City to Los Angeles flights
Kansas City to Seattle flights
Kansas City to O'Hare Intl flights
St. Louis to Hobby flights
Kansas City to Miami flights
St. Louis to Seattle flights
Kansas City to Dallas/Fort Worth flights
Kansas City to Hobby flights
St. Louis to Los Angeles flights
Kansas City to Tampa flights
St. Louis to George Bush Intcntl flights
Kansas City to Dulles Intl flights
Kansas City to George Bush Intcntl flights
St. Louis to San Francisco flights
Kansas City to Reagan-National flights
St. Louis to Dulles Intl flights
Kansas City to Baltimore flights
St. Louis to New Orleans flights
St. Louis to Tampa flights
St. Louis to Boston flights
Kansas City to Fort Lauderdale flights
St. Louis to Honolulu flights
St. Louis to Salt Lake City flights
St. Louis to Fort Lauderdale flights
Kansas City to Boston flights
St. Louis to San Diego flights
Kansas City to San Diego flights
Kansas City to Ontario flights
St. Louis to Reagan-National flights
St. Louis to O'Hare Intl flights
Kansas City to Nashville flights
St. Louis to Key West flights

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 October 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$50Average$124FlexibilityNo cancel feeOn-time62%
DeltaCheapest$108Average$329FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$155Average$445FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$177Average$333FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$201Average$390FlexibilityNo cancel feeOn-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.