$54+ 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 2/8. Fares are subject to change and may not be available on all flights or dates of travel.
STL — DEN
Feb 25 — Mar 41
1 adult, Economy
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Cheapest flights from St. Louis to ColoradoExplore 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 January 26, 2026.
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 January 26, 2026.
This Kiwi.com deal was found by Cheapflights users on 1/26. 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 2/73:46 pm
STL
- DEN
Nonstop2h 37m
Frontier
Wed 2/1110:50 am
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 1/26![Frontier logo]()
$67
This Kiwi.com deal was found by Cheapflights users on 1/24. 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 2/212:51 pm
STL
- DEN
Nonstop2h 27m
Frontier
Wed 2/2512:48 pm
DEN
- STL
Nonstop2h 05m
Frontier
Deal found 1/24![Frontier logo]()
$71
This Super.com deal was found by Cheapflights users on 1/24. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/254:51 pm
STL
- DEN
Nonstop2h 34m
Frontier
Fri 2/2710:01 am
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 1/24![Frontier logo]()
$72
This Super.com deal was found by Cheapflights users on 1/25. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/142:51 pm
STL
- DEN
Nonstop2h 27m
Frontier
Wed 2/1812:48 pm
DEN
- STL
Nonstop2h 05m
Frontier
Deal found 1/25![Frontier logo]()
$76
This Super.com deal was found by Cheapflights users on 1/23. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/307:39 pm
STL
- DEN
Nonstop2h 32m
Frontier
Sat 1/3111:38 am
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 1/23![Frontier logo]()
$82
This Cheapflightsfares deal was found by Cheapflights users on 1/24. 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.
Wed 2/43:46 pm
STL
- DEN
Nonstop2h 37m
Frontier
Mon 2/99:41 am
DEN
- STL
Nonstop2h 09m
Frontier
Deal found 1/24![Frontier logo]()
$83
This deal was found by Cheapflights users on 1/25. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/282:51 pm
STL
- DEN
Nonstop2h 27m
Frontier
Sat 3/76:35 am
DEN
- STL
Nonstop2h 14m
Frontier
Deal found 1/25![Frontier logo]()
$85
This Super.com deal was found by Cheapflights users on 1/23. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/313:46 pm
STL
- DEN
Nonstop2h 37m
Frontier
Sun 2/18:10 am
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 1/23![Frontier logo]()
$87
This Cheapflightsfares deal was found by Cheapflights users on 1/25. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/212:51 pm
STL
- DEN
Nonstop2h 27m
Frontier
Sat 2/2810:48 am
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 1/25![Frontier logo]()
$88
This Super.com deal was found by Cheapflights users on 1/23. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/67:39 pm
STL
- DEN
Nonstop2h 32m
Frontier
Mon 2/99:41 am
DEN
- STL
Nonstop2h 09m
Frontier
Deal found 1/23![Frontier logo]()
$97
This Cheapflightsfares deal was found by Cheapflights users on 1/24. 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 1/307:39 pm
STL
- DEN
Nonstop2h 32m
Frontier
Sun 2/18:10 am
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 1/24![Frontier logo]()
$102
This Delta deal was found by Cheapflights users on 1/24. 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 2/106:00 am
STL
- HDN
1 stop7h 41m
Delta
Sat 2/143:40 pm
HDN
- STL
1 stop6h 43m
Delta
Deal found 1/24![Delta logo]()
$228
Find 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 January 26, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $67 (Super.com) |
One-way from | $54 (Frontier) |
Popular in | March |
Cheapest in | October |
Average price | $198 |
Good round-trip deal | $236 or less |
Good one-way deal | $147 or less |
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 January 26, 2026.
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
Sat 2/28
2:51 pm-4:18 pm
Nonstop2h 27m
Denver Intl
Sat 3/7
6:35 am-9:49 am
Nonstop2h 14m
$85
St. LouisDenver
STL - DEN
STLDEN
Lambert-St Louis
Sun 2/8
12:03 pm-1:36 pm
Nonstop2h 33m
Denver Intl
Wed 2/11
10:29 pm-9:26 pm
1 stop21h 57m
$134
St. LouisDenver
STL - DEN
STLDEN
Lambert-St Louis
Sat 2/21
4:30 pm-6:04 pm
Nonstop2h 34m
Denver Intl
Wed 2/25
10:10 am-1:14 pm
Nonstop2h 04m
$177
St. LouisDenver
STL - DEN
STLDEN
Lambert-St Louis
Wed 2/18
5:55 pm-9:40 pm
1 stop4h 45m
Denver Intl
Sat 2/21
6:20 am-9:35 am
Nonstop2h 15m
$207
St. LouisDenver
STL - DEN
STLDEN
Lambert-St Louis
Fri 5/1
9:55 pm-3:59 am
1 stop7h 04m
Denver Intl
Wed 5/6
11:59 pm-10:30 am
1 stop9h 31m
$215
St. LouisDenver
STL - DEN
STLDEN
Lambert-St Louis
Sat 2/21
6:35 pm-8:00 pm
Nonstop2h 25m
Denver Intl
Wed 2/25
11:05 am-5:10 pm
1 stop5h 05m
$227
St. LouisVail
STL - EGE
STLEGE
Lambert-St Louis
Tue 3/3
7:10 am-2:05 pm
1 stop7h 55m
Vail Eagle County
Tue 3/10
3:31 pm-11:58 pm
1 stop7h 27m
$229
St. LouisAspen
STL - ASE
STLASE
Lambert-St Louis
Tue 3/3
4:30 pm-8:19 pm
1 stop4h 49m
Aspen Pitkin County
Tue 3/10
2:27 pm-8:41 pm
1 stop5h 14m
$229
St. LouisVail
STL - EGE
STLEGE
Lambert-St Louis
Sat 2/21
8:30 am-2:54 pm
1 stop7h 24m
Vail Eagle County
Sat 2/28
7:05 am-1:14 pm
1 stop5h 09m
$229
St. LouisVail
STL - EGE
STLEGE
Lambert-St Louis
Tue 3/3
6:25 am-11:25 am
1 stop6h 00m
Vail Eagle County
Tue 3/10
1:35 pm-10:59 pm
2 stops8h 24m
$234
Showing 1-10 of 52 results
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 $42). 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 January 26, 2026.
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 61% 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 January 24, 2026.
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. Sunday 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 January 26, 2026.
The most flights from STL to USCO are scheduled on a Sunday (13 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (9 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 January 26, 2026.
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.
Crew
8.6
Entertainment
7.5
Food
7.0
Overall
8.0
Comfort
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Entertainment
7.5
Food
7.0
Overall
8.0
Comfort
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Entertainment
7.5
Food
7.0
Overall
8.0
Comfort
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Entertainment
7.5
Food
7.0
Overall
8.0
Comfort
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Entertainment
7.5
Food
7.0
Overall
8.0
Comfort
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Entertainment
7.5
Food
7.0
Overall
8.0
Comfort
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
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.
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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.
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 January 26, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$49 | Average$125 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$108 | Average$308 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$153 | Average$412 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$176 | Average$333 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$201 | Average$372 | FlexibilityNo cancel fee | On-time71% |