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St. Louis

$67+ 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 6/9. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — STL
May 6 — May 131
Tue 5/6
Tue 5/13
1 adult, Economy
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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 May 1, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$116
(Kiwi.com)

One-way from

$67
(Cheapflightsfares)

Popular in

March

Cheapest in

July

Average price

$166

Good round-trip deal

$196 or less

Good one-way deal

$126 or less
Provider with most accurate pricing for Denver Intl-Lambert-St Louis flight deals.
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Provider most trusted by Cheapflights users for Denver Intl-Lambert-St Louis flights.
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From Colorado to Lambert-St Louis
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One-way flight from Colorado to Lambert-St Louis
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Highest demand for flights based on searches. 12% potential increase in price ($29 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in May 2025
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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 May 1, 2025.

This Kiwi.com deal was found by Cheapflights users on 4/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/117:00 amDEN - STL
Nonstop2h 08mFrontier
Wed 6/187:29 pmSTL - DEN
Nonstop2h 27mFrontier
Deal found 4/28$116
This CheapOair deal was found by Cheapflights users on 4/30. 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.
Fri 5/306:30 pmDEN - STL
1 stop19h 24mMultiple Airlines
Mon 6/27:24 pmSTL - DEN
Nonstop2h 27mMultiple Airlines
Deal found 4/30$198
This United Airlines deal was found by Cheapflights users on 4/29. 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.
Wed 6/118:40 pmDEN - STL
Nonstop2h 19mUnited Airlines
Tue 6/174:32 pmSTL - DEN
Nonstop2h 29mUnited Airlines
Deal found 4/29$210
This Delta deal was found by Cheapflights users on 4/30. 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.
Fri 5/3012:55 amDEN - STL
1 stop7h 40mDelta
Wed 6/41:09 pmSTL - DEN
1 stop5h 30mDelta
Deal found 4/30$217
This Southwest deal was found by Cheapflights users on 4/29. 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.
Wed 5/2110:25 amDEN - STL
Nonstop2h 05mSouthwest
Tue 5/275:55 amSTL - DEN
Nonstop2h 20mSouthwest
Deal found 4/29$220
This American Airlines deal was found by Cheapflights users on 4/30. 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 5/2711:59 pmDEN - STL
1 stop7h 57mAmerican Airlines
Tue 6/310:31 amSTL - DEN
1 stop7h 36mAmerican Airlines
Deal found 4/30$230
This United Airlines deal was found by Cheapflights users on 4/30. 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.
Wed 5/283:47 pmCOS - STL
1 stop4h 01mUnited Airlines
Wed 6/45:20 amSTL - COS
1 stop6h 34mUnited Airlines
Deal found 4/30$243
This Delta deal was found by Cheapflights users on 4/29. 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 8/1211:35 amCOS - STL
2 stops11h 04mDelta
Tue 8/266:30 amSTL - COS
1 stop5h 14mDelta
Deal found 4/29$248
This Delta deal was found by Cheapflights users on 4/29. 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.
Sun 5/253:15 pmGJT - STL
1 stop5h 17mDelta
Mon 6/22:29 pmSTL - GJT
1 stop4h 41mDelta
Deal found 4/29$289
This American Airlines deal was found by Cheapflights users on 4/30. 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.
Sat 6/711:22 amASE - STL
1 stop7h 13mAmerican Airlines
Tue 6/107:20 amSTL - ASE
1 stop5h 13mAmerican Airlines
Deal found 4/30$289
This United Airlines deal was found by Cheapflights users on 4/30. 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.
Wed 5/217:15 amMTJ - STL
1 stop4h 30mUnited Airlines
Wed 5/286:30 amSTL - MTJ
1 stop5h 43mUnited Airlines
Deal found 4/30$341
This American Airlines deal was found by Cheapflights users on 4/30. 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.
Sat 5/2411:52 amDRO - STL
1 stop5h 29mAmerican Airlines
Thu 5/295:19 amSTL - DRO
1 stop7h 52mAmerican Airlines
Deal found 4/30$343

Cheapflights Fare Finder

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 May 1, 2025.
Use the filters below to find and compare flights from Colorado to St. Louis that are best for you.

Fly from

Colorado

Fly to

St. Louis

Route

Depart

Return

Price

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Wed 6/11

7:00 am-10:08 am

Nonstop2h 08m

Lambert-St Louis

Wed 6/18

7:29 pm-8:56 pm

Nonstop2h 27m

$116

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Fri 5/30

6:30 pm-2:54 pm

1 stop19h 24m

Lambert-St Louis

Mon 6/2

7:24 pm-8:51 pm

Nonstop2h 27m

$198

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Wed 6/11

8:40 pm-11:59 pm

Nonstop2h 19m

Lambert-St Louis

Tue 6/17

4:32 pm-6:01 pm

Nonstop2h 29m

$210

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Fri 5/30

12:55 am-9:35 am

1 stop7h 40m

Lambert-St Louis

Wed 6/4

1:09 pm-5:39 pm

1 stop5h 30m

$217

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Wed 5/21

10:25 am-1:30 pm

Nonstop2h 05m

Lambert-St Louis

Tue 5/27

5:55 am-7:15 am

Nonstop2h 20m

$220

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Tue 5/27

11:59 pm-8:56 am

1 stop7h 57m

Lambert-St Louis

Tue 6/3

10:31 am-5:07 pm

1 stop7h 36m

$230

Colorado SpringsSt. Louis

COS - STL

COSSTL

Colorado Springs

Wed 5/28

3:47 pm-8:48 pm

1 stop4h 01m

Lambert-St Louis

Wed 6/4

5:20 am-10:54 am

1 stop6h 34m

$243

Colorado SpringsSt. Louis

COS - STL

COSSTL

Colorado Springs

Tue 8/12

11:35 am-11:39 pm

2 stops11h 04m

Lambert-St Louis

Tue 8/26

6:30 am-10:44 am

1 stop5h 14m

$248

AspenSt. Louis

ASE - STL

ASESTL

Aspen Pitkin County

Sat 6/7

11:22 am-7:35 pm

1 stop7h 13m

Lambert-St Louis

Tue 6/10

7:20 am-11:33 am

1 stop5h 13m

$289

Grand JunctionSt. Louis

GJT - STL

GJTSTL

Grand Junction Regnl

Sun 5/25

3:15 pm-9:32 pm

1 stop5h 17m

Lambert-St Louis

Mon 6/2

2:29 pm-6:10 pm

1 stop4h 41m

$289

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

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.

Cheapflights Insights

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

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 May 1, 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.

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 May 1, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest 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.
Alaska Airlines
8.0
Very good
9,968 reviews

Entertainment

7.1

Food

7.1

Crew

8.5

Comfort

7.9

Overall

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
9,968 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Entertainment

7.1

Food

7.1

Crew

8.5

Comfort

7.9

Overall

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,294 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Entertainment

7.1

Food

7.1

Crew

8.5

Comfort

7.9

Overall

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,934 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Entertainment

7.1

Food

7.1

Crew

8.5

Comfort

7.9

Overall

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,696 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Entertainment

7.1

Food

7.1

Crew

8.5

Comfort

7.9

Overall

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Entertainment

7.1

Food

7.1

Crew

8.5

Comfort

7.9

Overall

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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 27 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 ($67), 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 Sun Country Air (100%), Frontier (89%) and Air Canada (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 $220, our data indicates the cheapest price to be $69. The most popular route (Denver Intl - Lambert-St Louis), is priced around $156.

  • 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
Maryland Heights
Fairview Heights
Collinsville
Wentzville
Eureka
St. Peters
Festus
Glencoe
Alton
Farmington
O'Fallon

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Alternative routes for Colorado to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.
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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 May 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$45Average$144FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$150Average$465FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$173Average$343FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$246Average$392FlexibilityNo cancel feeOn-time71%

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