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

$43+ 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 1/17. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — STL
Dec 23 — Dec 301
Mon 12/23
Mon 12/30
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

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 December 18, 2024.

Round-trip from

$72
(Cheapflightsfares)

One-way from

$43
(Cheapflightsfares)
From Colorado to Lambert-St Louis
Search Deals
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 December 18, 2024.

This Cheapflightsfares deal was found by Cheapflights users on 12/17. 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.
Mon 12/305:05 amDEN - STL
Nonstop2h 08mFrontier
Thu 1/210:09 pmSTL - DEN
Nonstop2h 39mFrontier
Deal found 12/17$126
This American Airlines deal was found by Cheapflights users on 12/17. 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.
Tue 12/245:27 amDRO - STL
1 stop6h 36mAmerican Airlines
Fri 1/101:40 pmSTL - DRO
1 stop8h 06mAmerican Airlines
Deal found 12/17$293
This Delta deal was found by Cheapflights users on 12/17. 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.
Tue 12/241:16 pmGJT - STL
1 stop7h 18mDelta
Fri 1/105:00 pmSTL - GJT
1 stop6h 35mDelta
Deal found 12/17$303
This United Airlines deal was found by Cheapflights users on 12/17. 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 12/243:25 pmGUC - STL
1 stop4h 01mUnited Airlines
Wed 1/84:36 pmSTL - GUC
1 stop4h 34mUnited Airlines
Deal found 12/17$333
This United Airlines deal was found by Cheapflights users on 12/17. 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 12/2411:50 amDRO - STL
1 stop7h 36mUnited Airlines
Fri 1/104:36 pmSTL - DRO
1 stop4h 57mUnited Airlines
Deal found 12/17$363
This United Airlines deal was found by Cheapflights users on 12/16. 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 12/315:20 pmDEN - STL
Nonstop2h 06mUnited Airlines
Thu 1/21:44 pmSTL - DEN
Nonstop2h 30mUnited Airlines
Deal found 12/16$367
This Southwest deal was found by Cheapflights users on 12/17. 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 12/312:50 pmCOS - STL
1 stop7h 20mSouthwest
Sat 1/46:40 pmSTL - COS
1 stop6h 50mSouthwest
Deal found 12/17$382
This United Airlines deal was found by Cheapflights users on 12/17. 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 12/2411:40 amGJT - STL
2 stops9h 05mUnited Airlines
Wed 1/81:02 pmSTL - GJT
2 stops10h 17mUnited Airlines
Deal found 12/17$383
This United Airlines deal was found by Cheapflights users on 12/17. 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 12/241:25 pmMTJ - STL
1 stop6h 01mUnited Airlines
Wed 1/88:27 amSTL - MTJ
1 stop5h 04mUnited Airlines
Deal found 12/17$385
This Southwest deal was found by Cheapflights users on 12/16. 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.
Mon 12/308:10 amDEN - STL
1 stop3h 35mSouthwest
Wed 1/110:45 amSTL - DEN
1 stop6h 00mSouthwest
Deal found 12/16$386
This United Airlines deal was found by Cheapflights users on 12/17. 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 12/313:30 pmCOS - STL
1 stop3h 56mUnited Airlines
Sat 1/411:30 amSTL - COS
2 stops11h 33mUnited Airlines
Deal found 12/17$406
This American Airlines deal was found by Cheapflights users on 12/17. 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.
Mon 12/233:30 pmGJT - STL
1 stop7h 36mAmerican Airlines
Wed 12/257:04 amSTL - GJT
1 stop5h 54mAmerican Airlines
Deal found 12/17$443

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 December 18, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Wed 1/15

6:00 am-9:06 am

Nonstop2h 06m

Lambert-St Louis

Mon 1/20

7:09 pm-8:37 pm

Nonstop2h 28m

$72

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Wed 2/12

7:20 pm-10:20 pm

Nonstop2h 00m

Lambert-St Louis

Tue 2/18

8:15 pm-9:45 pm

Nonstop2h 30m

$158

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Wed 2/12

8:07 am-2:07 pm

1 stop5h 00m

Lambert-St Louis

Tue 2/18

4:20 pm-11:20 pm

1 stop8h 00m

$198

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Fri 2/14

7:47 am-2:36 pm

1 stop5h 49m

Lambert-St Louis

Mon 2/17

5:36 pm-11:30 pm

1 stop6h 54m

$216

Colorado SpringsSt. Louis

COS - STL

COSSTL

Colorado Springs

Sat 1/18

10:21 am-4:23 pm

1 stop5h 02m

Lambert-St Louis

Sat 1/25

3:41 pm-8:10 pm

1 stop5h 29m

$277

Colorado SpringsSt. Louis

COS - STL

COSSTL

Colorado Springs

Sat 1/18

6:00 am-3:35 pm

1 stop8h 35m

Lambert-St Louis

Sat 1/25

10:22 am-7:11 pm

2 stops9h 49m

$281

DurangoSt. Louis

DRO - STL

DROSTL

Durango La Plata County

Fri 1/10

6:00 am-1:42 pm

1 stop6h 42m

Lambert-St Louis

Sun 1/12

2:27 pm-9:36 pm

1 stop8h 09m

$283

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Sat 2/15

6:05 am-2:50 pm

1 stop7h 45m

Lambert-St Louis

Sun 2/16

10:22 am-5:03 pm

1 stop7h 41m

$301

MontroseSt. Louis

MTJ - STL

MTJSTL

Montrose County

Wed 1/15

3:29 pm-8:43 pm

1 stop4h 14m

Lambert-St Louis

Tue 1/21

8:27 am-12:31 pm

1 stop5h 04m

$315

Colorado SpringsSt. Louis

COS - STL

COSSTL

Colorado Springs

Wed 2/5

6:15 am-12:55 pm

1 stop5h 40m

Lambert-St Louis

Wed 2/5

5:10 pm-9:35 pm

1 stop5h 25m

$326

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/18

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 December 18, 2024.

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.

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 December 18, 2024.
Read reviews from past customers who have flown American Airlines, 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
4,848 reviews

Comfort

8.1

Entertainment

7.7

Overall

8.1

Boarding

8.2

Crew

8.7

Food

7.2

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
4,848 reviews
Southwest
8.1
Very good
4,848 reviews

Comfort

8.1

Entertainment

7.7

Overall

8.1

Boarding

8.2

Crew

8.7

Food

7.2

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
9,552 reviews
Southwest
8.1
Very good
4,848 reviews

Comfort

8.1

Entertainment

7.7

Overall

8.1

Boarding

8.2

Crew

8.7

Food

7.2

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
8,604 reviews
Southwest
8.1
Very good
4,848 reviews

Comfort

8.1

Entertainment

7.7

Overall

8.1

Boarding

8.2

Crew

8.7

Food

7.2

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
9,059 reviews
Southwest
8.1
Very good
4,848 reviews

Comfort

8.1

Entertainment

7.7

Overall

8.1

Boarding

8.2

Crew

8.7

Food

7.2

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
4,848 reviews

Comfort

8.1

Entertainment

7.7

Overall

8.1

Boarding

8.2

Crew

8.7

Food

7.2

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 28 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 ($43), Southwest ($79), and United Airlines ($88).

  • 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, Grand Junction Regnl - Lambert-St Louis or Colorado Springs - 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 (90%) and Southwest (84%).

  • 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 $196, our data indicates the cheapest price to be $34. The most popular route (Denver Intl - Lambert-St Louis), is priced around $125.

  • 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

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 Kansas City flights
LaGuardia to St. Louis flights
Hobby to Kansas City flights
O'Hare Intl to Kansas City flights
John F Kennedy Intl to Kansas City flights
Newark to Kansas City flights
Seattle to Kansas City flights
Denver to Kansas City flights
John F Kennedy Intl to St. Louis flights
Los Angeles to Kansas City flights
Dulles Intl to St. Louis flights
Dulles Intl to Kansas City flights
Seattle to St. Louis flights
Atlanta to St. Louis flights
George Bush Intcntl to Kansas City flights
Boston to Kansas City flights
Dallas/Fort Worth to St. Louis flights
Los Angeles to St. Louis flights
Denver to St. Louis flights
Atlanta to Kansas City flights
Dallas/Fort Worth to Kansas City flights
Baltimore to St. Louis flights
Orlando to St. Louis flights
Reagan-National to St. Louis flights
O'Hare Intl to St. Louis flights
Boston to St. Louis flights
San Francisco to St. Louis flights
Baltimore to Kansas City flights
Reagan-National to Kansas City flights
San Francisco to Kansas City flights
Philadelphia to St. Louis flights
Detroit to Kansas City flights
Hobby to St. Louis flights
Philadelphia to Kansas City flights
Orlando to Kansas City flights
George Bush Intcntl to St. Louis flights
Portland to Kansas City flights
Ontario to Kansas City flights
Minneapolis to Kansas City flights
Minneapolis to St. Louis flights
Miami to St. Louis flights
Detroit to St. Louis flights
Charlotte to St. Louis flights
Salt Lake City to Kansas City flights
Sky Harbor Intl to St. Louis flights
Tampa to Kansas City flights
Raleigh to Kansas City flights
Austin to St. Louis flights
Salt Lake City 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 December 18, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$52Average$147FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$140Average$321FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$149Average$469FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$212Average$369FlexibilityNo 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.