$29+ 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 1/17. Fares are subject to change and may not be available on all flights or dates of travel.
STL — DEN
Jan 11 — Jan 181
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 December 12, 2025.
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 December 12, 2025.
This Super.com deal was found by Cheapflights users on 12/10. 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 12/317:43 pmSTL - DEN
Nonstop2h 32mFrontier
Mon 1/56:50 amDEN - STL
Nonstop2h 12mFrontier
Deal found 12/10![Frontier logo]()
$172
This CheapOair deal was found by Cheapflights users on 12/10. 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.
Wed 12/317:43 pmSTL - DEN
Nonstop2h 32mFrontier
Tue 1/611:59 pmDEN - STL
1 stop21h 34mFrontier
Deal found 12/10![Frontier logo]()
$178
This Frontier deal was found by Cheapflights users on 12/10. 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.
Wed 12/317:43 pmSTL - DEN
Nonstop2h 32mFrontier
Thu 1/111:59 pmDEN - STL
1 stop7h 13mFrontier
Deal found 12/10![Frontier logo]()
$201
This Super.com deal was found by Cheapflights users on 12/10. 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 12/207:43 pmSTL - DEN
Nonstop2h 32mFrontier
Sat 12/276:50 amDEN - STL
Nonstop2h 12mFrontier
Deal found 12/10![Frontier logo]()
$203
This Frontier deal was found by Cheapflights users on 12/10. 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.
Wed 12/247:43 pmSTL - DEN
Nonstop2h 32mFrontier
Mon 1/56:50 amDEN - STL
Nonstop2h 12mFrontier
Deal found 12/10![Frontier logo]()
$205
This Frontier deal was found by Cheapflights users on 12/11. 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.
Mon 12/224:27 pmSTL - DEN
1 stop7h 37mFrontier
Wed 12/316:50 amDEN - STL
Nonstop2h 12mFrontier
Deal found 12/11![Frontier logo]()
$211
This Frontier deal was found by Cheapflights users on 12/10. 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.
Tue 12/2310:10 pmSTL - DEN
1 stop6h 48mFrontier
Wed 12/316:50 amDEN - STL
Nonstop2h 12mFrontier
Deal found 12/10![Frontier logo]()
$212
This Delta deal was found by Cheapflights users on 12/10. 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 12/247:00 amSTL - HDN
1 stop6h 23mDelta
Sun 12/281:28 pmHDN - STL
1 stop7h 15mDelta
Deal found 12/10![Delta logo]()
$239
This American Airlines deal was found by Cheapflights users on 12/10. 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 12/256:00 amSTL - EGE
1 stop4h 54mAmerican Airlines
Mon 12/2912:01 pmEGE - STL
1 stop6h 30mAmerican Airlines
Deal found 12/10![American Airlines logo]()
$269
This American Airlines deal was found by Cheapflights users on 12/10. 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 12/235:16 amSTL - ASE
1 stop8h 28mAmerican Airlines
Sun 12/284:24 pmASE - STL
1 stop5h 32mAmerican Airlines
Deal found 12/10![American Airlines logo]()
$269
This United Airlines deal was found by Cheapflights users on 12/9. 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 12/249:00 amSTL - HDN
1 stop4h 35mUnited Airlines
Thu 12/2512:25 pmHDN - STL
1 stop8h 18mUnited Airlines
Deal found 12/9![United Airlines logo]()
$309
This United Airlines deal was found by Cheapflights users on 12/11. 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 12/232:45 pmSTL - ASE
1 stop4h 57mUnited Airlines
Sun 12/282:00 pmASE - STL
1 stop7h 22mUnited Airlines
Deal found 12/11![United Airlines logo]()
$374
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 December 12, 2025.
Most accurate provider | CheapOair 3 stars |
|---|---|
Most trusted provider | CheapOair 3 stars |
Round-trip from | $70 (Frontier) |
One-way from | $29 (Expedia) |
Popular in | March |
Cheapest in | October |
Average price | $229 |
Good round-trip deal | $218 or less |
Good one-way deal | $128 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 December 12, 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
Wed 1/7
5:11 pm-9:49 pm
2 stops29h 38m
Denver Intl
Sat 1/10
6:50 am-10:02 am
Nonstop2h 12m
$123
St. LouisDenver
STL - DEN
STLDEN
Lambert-St Louis
Wed 1/7
7:43 pm-9:15 pm
Nonstop2h 32m
Denver Intl
Wed 1/14
10:40 am-12:40 pm
2 stops25h 00m
$131
St. LouisDenver
STL - DEN
STLDEN
Lambert-St Louis
Wed 1/7
7:43 pm-9:15 pm
Nonstop2h 32m
Denver Intl
Wed 1/14
9:20 pm-10:34 pm
3 stops24h 14m
$169
St. LouisDenver
STL - DEN
STLDEN
Lambert-St Louis
Wed 1/7
11:23 am-4:44 pm
1 stop6h 21m
Denver Intl
Sat 1/10
12:42 pm-9:35 pm
1 stop7h 53m
$197
St. LouisDenver
STL - DEN
STLDEN
Lambert-St Louis
Fri 2/13
1:59 pm-3:35 pm
Nonstop2h 36m
Denver Intl
Mon 2/16
9:06 pm-6:51 am
2 stops32h 45m
$197
St. LouisHayden
STL - HDN
STLHDN
Lambert-St Louis
Sun 2/1
5:30 am-12:35 pm
1 stop8h 05m
Hayden Yampa Valley
Thu 2/5
1:15 pm-8:20 pm
1 stop6h 05m
$211
St. LouisMontrose
STL - MTJ
STLMTJ
Lambert-St Louis
Wed 1/7
6:30 am-11:27 am
1 stop5h 57m
Montrose County
Wed 1/14
1:32 pm-8:58 pm
1 stop6h 26m
$211
St. LouisMontrose
STL - MTJ
STLMTJ
Lambert-St Louis
Wed 1/7
6:20 am-12:00 pm
1 stop6h 40m
Montrose County
Wed 1/14
12:40 pm-5:30 pm
1 stop3h 50m
$211
St. LouisHayden
STL - HDN
STLHDN
Lambert-St Louis
Mon 2/2
11:20 am-8:16 pm
2 stops9h 56m
Hayden Yampa Valley
Fri 2/6
1:32 pm-8:58 pm
1 stop6h 26m
$216
St. LouisGunnison
STL - GUC
STLGUC
Lambert-St Louis
Tue 1/13
11:20 am-8:24 pm
2 stops10h 04m
Gunnison
Sat 1/17
3:24 pm-8:58 pm
1 stop4h 34m
$216
Showing 1-10 of 56 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 $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 December 12, 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 in the afternoon 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 December 12, 2025.
The most flights from STL to USCO are scheduled on a Wednesday (12 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (6 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 December 12, 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.
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Overall
7.9
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Overall
7.9
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Overall
7.9
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Overall
7.9
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Overall
7.9
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Overall
7.9
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 December 12, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$50 | Average$125 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$128 | Average$334 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$158 | Average$435 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$176 | Average$334 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$201 | Average$384 | FlexibilityNo cancel fee | On-time71% |