HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
St. Louis

$34+ 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 3/29. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — STL
Feb 25 — Mar 41
Tue 2/25
Tue 3/4
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Colorado to St. Louis 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 Colorado to St. Louis

Keep the following information in mind while searching for Colorado to St. Louis flight deals. Data was last updated February 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$72
(Kiwi.com)

One-way from

$34
(Frontier)

Popular in

November

Cheapest in

May

Average price

$217

Good round-trip deal

$90 or less

Good one-way deal

$49 or less
Provider with most accurate pricing for Denver Intl-Lambert-St Louis flight deals.
Search Deals
Provider most trusted by Cheapflights users for Denver Intl-Lambert-St Louis flights.
Search Deals
From Colorado to Lambert-St Louis
Search Deals
One-way flight from Colorado to Lambert-St Louis
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($28 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($4 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2025
Search Deals
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.
Search Deals

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 February 20, 2025.

This Kiwi.com deal was found by Cheapflights users on 2/19. 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 2/266:00 amDEN - STL
Nonstop2h 16mFrontier
Fri 2/287:09 pmSTL - DEN
Nonstop2h 28mFrontier
Deal found 2/19$67
This Gotogate deal was found by Cheapflights users on 2/20. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/76:00 amDEN - STL
Nonstop2h 16mMultiple Airlines
Mon 3/106:30 amSTL - DEN
1 stop13h 03mMultiple Airlines
Deal found 2/20$167
This Sun Country Air deal was found by Cheapflights users on 2/20. 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 Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/76:50 pmDEN - STL
1 stop15h 44mSun Country Air
Mon 3/106:30 amSTL - DEN
1 stop13h 03mSun Country Air
Deal found 2/20$210
This Delta deal was found by Cheapflights users on 2/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/312:55 amDEN - STL
1 stop7h 41mDelta
Mon 4/75:35 pmSTL - DEN
1 stop6h 27mDelta
Deal found 2/20$237
This Southwest deal was found by Cheapflights users on 2/20. 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.
Tue 3/258:15 amDEN - STL
Nonstop2h 05mSouthwest
Sat 3/296:15 amSTL - DEN
Nonstop2h 25mSouthwest
Deal found 2/20$244
This American Airlines deal was found by Cheapflights users on 2/20. 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.
Thu 3/612:25 amDEN - STL
1 stop6h 44mAmerican Airlines
Mon 3/104:26 pmSTL - DEN
1 stop7h 07mAmerican Airlines
Deal found 2/20$291
This Delta deal was found by Cheapflights users on 2/19. 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.
Thu 4/246:00 amCOS - STL
1 stop8h 00mDelta
Sun 4/275:32 pmSTL - COS
1 stop6h 36mDelta
Deal found 2/19$292
This United Airlines deal was found by Cheapflights users on 2/20. 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.
Tue 6/245:40 pmDEN - STL
Nonstop2h 08mUnited Airlines
Mon 6/304:30 pmSTL - DEN
Nonstop2h 29mUnited Airlines
Deal found 2/20$308
This United Airlines deal was found by Cheapflights users on 2/20. 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.
Fri 3/75:15 amDRO - STL
1 stop6h 34mUnited Airlines
Tue 3/118:20 amSTL - DRO
1 stop5h 17mUnited Airlines
Deal found 2/20$329
This American Airlines deal was found by Cheapflights users on 2/19. 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 3/612:35 pmCOS - STL
1 stop19h 09mAmerican Airlines
Mon 3/105:37 pmSTL - COS
1 stop7h 10mAmerican Airlines
Deal found 2/19$330
This American Airlines deal was found by Cheapflights users on 2/20. 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.
Fri 3/75:27 amDRO - STL
2 stops9h 24mAmerican Airlines
Tue 3/112:22 pmSTL - DRO
1 stop8h 23mAmerican Airlines
Deal found 2/20$334
This American Airlines deal was found by Cheapflights users on 2/20. 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.
Wed 3/128:00 amEGE - STL
1 stop7h 41mAmerican Airlines
Wed 3/195:55 amSTL - EGE
1 stop7h 12mAmerican Airlines
Deal found 2/20$339

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 February 20, 2025.

Fly from

Colorado

Fly to

St. Louis

Route

Depart

Return

Price

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Sat 5/24

6:00 am-9:12 am

Nonstop2h 12m

Lambert-St Louis

Wed 5/28

6:55 pm-8:26 pm

Nonstop2h 31m

$72

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Fri 3/7

6:00 am-9:16 am

Nonstop2h 16m

Lambert-St Louis

Mon 3/10

6:30 am-6:33 pm

1 stop13h 03m

$167

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Fri 3/7

6:50 pm-11:34 am

1 stop15h 44m

Lambert-St Louis

Mon 3/10

6:30 am-6:33 pm

1 stop13h 03m

$210

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Thu 4/3

12:55 am-9:36 am

1 stop7h 41m

Lambert-St Louis

Mon 4/7

5:35 pm-11:02 pm

1 stop6h 27m

$237

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Tue 3/25

8:15 am-11:20 am

Nonstop2h 05m

Lambert-St Louis

Sat 3/29

6:15 am-7:40 am

Nonstop2h 25m

$244

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Thu 3/6

12:25 am-8:09 am

1 stop6h 44m

Lambert-St Louis

Mon 3/10

5:55 am-10:19 am

1 stop5h 24m

$291

Colorado SpringsSt. Louis

COS - STL

COSSTL

Colorado Springs

Thu 4/24

6:00 am-3:00 pm

1 stop8h 00m

Lambert-St Louis

Sun 4/27

5:32 pm-11:08 pm

1 stop6h 36m

$292

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Tue 6/24

5:40 pm-8:48 pm

Nonstop2h 08m

Lambert-St Louis

Sat 6/28

4:30 pm-5:59 pm

Nonstop2h 29m

$308

DurangoSt. Louis

DRO - STL

DROSTL

Durango La Plata County

Fri 3/7

5:15 am-12:49 pm

1 stop6h 34m

Lambert-St Louis

Tue 3/11

8:20 am-12:37 pm

1 stop5h 17m

$329

Colorado SpringsSt. Louis

COS - STL

COSSTL

Colorado Springs

Thu 3/6

12:35 pm-8:44 am

1 stop19h 09m

Lambert-St Louis

Mon 3/10

5:37 pm-11:47 pm

1 stop7h 10m

$330

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/20

Showing 1-10 of 36 results
1
2
3
4

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 February 20, 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 February 20, 2025.

The most flights from USCO to STL are scheduled on a Wednesday (13 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (5 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 February 20, 2025.
Read reviews from past customers who have flown Southwest, Alaska Airlines 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.
Southwest
8.1
Very good
4,411 reviews

Boarding

8.2

Entertainment

7.6

Comfort

8.1

Crew

8.7

Food

7.1

Overall

8.1

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Southwest
8.1
Very good
4,411 reviews
Southwest
8.1
Very good
4,411 reviews

Boarding

8.2

Entertainment

7.6

Comfort

8.1

Crew

8.7

Food

7.1

Overall

8.1

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Alaska Airlines
8.0
Very good
9,697 reviews
Southwest
8.1
Very good
4,411 reviews

Boarding

8.2

Entertainment

7.6

Comfort

8.1

Crew

8.7

Food

7.1

Overall

8.1

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Delta
8.0
Very good
8,219 reviews
Southwest
8.1
Very good
4,411 reviews

Boarding

8.2

Entertainment

7.6

Comfort

8.1

Crew

8.7

Food

7.1

Overall

8.1

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

United Airlines
7.4
Good
8,765 reviews
Southwest
8.1
Very good
4,411 reviews

Boarding

8.2

Entertainment

7.6

Comfort

8.1

Crew

8.7

Food

7.1

Overall

8.1

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,411 reviews

Boarding

8.2

Entertainment

7.6

Comfort

8.1

Crew

8.7

Food

7.1

Overall

8.1

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

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 ($34), United Airlines ($99), and Sun Country Air ($108).

  • 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 Grand Junction Regnl - 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 (87%), Frontier (73%) and United Airlines (73%).

  • 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 $183, our data indicates the cheapest price to be $19. The most popular route (Denver Intl - Lambert-St Louis), is priced around $149.

  • 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

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 Colorado to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.
Newark to St. Louis flights
LaGuardia to St. Louis flights
Dulles Intl to St. Louis flights
John F Kennedy Intl to St. Louis flights
LaGuardia to Kansas City flights
Los Angeles to St. Louis flights
Boston to Kansas City flights
Newark to Kansas City flights
Los Angeles to Kansas City flights
Boston to St. Louis flights
O'Hare Intl to Kansas City flights
John F Kennedy Intl to Kansas City flights
Minneapolis to St. Louis flights
Seattle to St. Louis flights
Seattle to Kansas City flights
Denver to Kansas City flights
Dulles Intl to Kansas City flights
Baltimore to St. Louis flights
Reagan-National to Kansas City flights
Reagan-National to St. Louis flights
San Francisco to St. Louis flights
Baltimore to Kansas City flights
Dallas/Fort Worth to Kansas City flights
Philadelphia to St. Louis flights
Denver to St. Louis flights
Atlanta to St. Louis flights
Sky Harbor Intl to St. Louis flights
Charlotte to St. Louis flights
San Francisco to Kansas City flights
Ontario to Kansas City flights
Minneapolis to Kansas City flights
Dallas/Fort Worth to St. Louis flights
Atlanta to Kansas City flights
O'Hare Intl to St. Louis flights
Ontario to St. Louis flights
Sky Harbor Intl to Kansas City flights
Detroit to Kansas City flights
Detroit to St. Louis flights
Salt Lake City to St. Louis flights
Midway to Kansas City flights
Tampa to Kansas City flights
Raleigh to St. Louis flights
Hobby to Kansas City flights
Orlando to St. Louis flights
Las Vegas to Kansas City flights
Salt Lake City to Kansas City flights
Hobby to St. Louis flights
Miami to St. Louis flights
Orlando to Kansas City flights
Las Vegas to St. Louis flights

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 February 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$46Average$142FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$143Average$330FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$149Average$478FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$212Average$387FlexibilityNo 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.