$84+ Cheap flights from St. Louis (STL) to Colorado
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/19. Fares are subject to change and may not be available on all flights or dates of travel.
STL — DEN
Oct 11 — Oct 181
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from St. Louis to Colorado 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 St. Louis to Colorado
Cheapest
Best
Last-minute
One-way
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 September 11, 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 September 11, 2026.
This Frontier deal was found by Cheapflights users on 9/10. 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.
Mon 12/147:49 pm -
Nonstop2h 31m
Thu 12/176:10 am -
1 stop7h 47m
Deal found 9/10![Frontier logo]()
$126
This Kiwi.com deal was found by Cheapflights users on 9/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/177:42 pm -
Nonstop2h 27m
Tue 10/206:57 pm -
1 stop21h 43m
Deal found 9/9![Frontier logo]()
$127
This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/231:30 pm -
1 stop7h 20m
Mon 10/264:12 pm -
Nonstop2h 03m
Deal found 9/10![Frontier logo]()
$128
This Cheapflightsfares deal was found by Cheapflights users on 9/7. 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 12/27:49 pm -
Nonstop2h 31m
Mon 12/73:50 pm -
Nonstop2h 04m
Deal found 9/7![Frontier logo]()
$131
This FlightHub deal was found by Cheapflights users on 9/8. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/191:30 pm -
1 stop24h 18m
Sat 10/243:54 pm -
Nonstop2h 03m
Deal found 9/8![Frontier logo]()
$132
This Frontier deal was found by Cheapflights users on 9/9. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/284:18 pm -
Nonstop2h 30m
Sat 10/3110:40 am -
1 stop11h 36m
Deal found 9/9![Frontier logo]()
$133
This Kiwi.com deal was found by Cheapflights users on 9/5. 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 11/147:59 pm -
Nonstop2h 31m
Mon 11/164:09 pm -
Nonstop2h 05m
Deal found 9/5![Frontier logo]()
$134
This Kiwi.com deal was found by Cheapflights users on 9/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/308:10 pm -
Nonstop2h 29m
Mon 10/56:40 am -
1 stop8h 54m
Deal found 9/10![Frontier logo]()
$135
This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/214:19 pm -
Nonstop2h 33m
Sat 10/314:09 pm -
Nonstop2h 05m
Deal found 9/10![Frontier logo]()
$136
This Super.com deal was found by Cheapflights users on 9/10. 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 10/214:19 pm -
Nonstop2h 33m
Wed 10/2812:21 pm -
Nonstop2h 02m
Deal found 9/10![Frontier logo]()
$137
This Frontier deal was found by Cheapflights users on 9/9. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/168:00 pm -
Nonstop2h 39m
Mon 10/194:12 pm -
Nonstop2h 03m
Deal found 9/9![Frontier logo]()
$138
This American Airlines deal was found by Cheapflights users on 9/6. 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 11/72:54 pm -
1 stop8h 12m
Sat 11/147:00 am -
1 stop6h 04m
Deal found 9/6![American Airlines logo]()
$318
Best flights from St. Louis to ColoradoDiscover carefully curated flight deals from St. Louis to Colorado that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 11, 2026.
Discover carefully curated flight deals from St. Louis to Colorado that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 11, 2026.
This Southwest deal was found by Cheapflights users on 9/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/89:50 pm -
Nonstop2h 25m
Thu 10/158:45 pm -
Nonstop2h 05m
Deal found 9/10![Southwest logo]()
$241
This United Airlines deal was found by Cheapflights users on 9/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/105:36 pm -
1 stop7h 18m
Tue 10/135:30 pm -
Nonstop2h 06m
Deal found 9/10![United Airlines logo]()
$267
This American Airlines deal was found by Cheapflights users on 9/5. 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 10/75:40 am -
1 stop5h 51m
Sun 10/115:00 pm -
1 stop5h 42m
Deal found 9/5![American Airlines logo]()
$329
This Delta deal was found by Cheapflights users on 9/8. 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.
Sat 10/31:40 pm -
1 stop7h 16m
Tue 10/136:07 pm -
1 stop5h 37m
Deal found 9/8![Delta logo]()
$333
This Southwest deal was found by Cheapflights users on 9/8. 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 10/215:50 am -
2 stops6h 10m
Mon 10/265:25 pm -
1 stop4h 25m
Deal found 9/8![Southwest logo]()
$266
This Alaska Airlines deal was found by Cheapflights users on 9/7. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/23:24 pm -
1 stop30h 06m
Mon 12/77:02 pm -
2 stops27h 57m
Deal found 9/7![Alaska Airlines logo]()
$553
This Southwest deal was found by Cheapflights users on 9/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/256:20 am -
Nonstop2h 20m
Sat 10/312:05 pm -
Nonstop2h 00m
Deal found 9/10![Southwest logo]()
$287
This United Airlines deal was found by Cheapflights users on 9/8. 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 10/74:39 pm -
1 stop4h 58m
Wed 10/143:23 pm -
1 stop4h 13m
Deal found 9/8![United Airlines logo]()
$325
This Southwest deal was found by Cheapflights users on 9/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/29:50 pm -
Nonstop2h 20m
Sun 10/46:20 am -
Nonstop2h 00m
Deal found 9/10![Southwest logo]()
$304
This United Airlines deal was found by Cheapflights users on 9/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/294:39 pm -
1 stop4h 50m
Sat 10/31:31 pm -
2 stops8h 27m
Deal found 9/10![United Airlines logo]()
$339
This American Airlines deal was found by Cheapflights users on 9/5. 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.
Sun 12/62:54 pm -
1 stop6h 23m
Thu 12/1012:54 pm -
1 stop6h 25m
Deal found 9/5![American Airlines logo]()
$377
This Delta deal was found by Cheapflights users on 9/7. 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.
Mon 10/57:05 am -
1 stop6h 09m
Mon 10/126:07 pm -
1 stop5h 37m
Deal found 9/7![Delta logo]()
$387
This Southwest deal was found by Cheapflights users on 9/5. 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 9/294:05 pm -
Nonstop2h 15m
Fri 10/98:45 pm -
Nonstop2h 05m
Deal found 9/5![Southwest logo]()
$305
This United Airlines deal was found by Cheapflights users on 9/8. 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 1/510:50 am -
1 stop8h 41m
Thu 1/71:30 pm -
1 stop6h 29m
Deal found 9/8![United Airlines logo]()
$341
This American Airlines deal was found by Cheapflights users on 9/5. 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 10/95:40 am -
1 stop4h 57m
Fri 10/93:58 pm -
1 stop6h 44m
Deal found 9/5![American Airlines logo]()
$397
This United Airlines deal was found by Cheapflights users on 9/6. 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.
Sat 11/78:50 am -
1 stop4h 43m
Sat 11/145:00 am -
2 stops9h 43m
Deal found 9/6![United Airlines logo]()
$344
This Southwest deal was found by Cheapflights users on 9/8. 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 10/271:25 pm -
2 stops7h 30m
Thu 10/295:30 am -
1 stop5h 50m
Deal found 9/8![Southwest logo]()
$338
This Southwest deal was found by Cheapflights users on 9/5. 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.
Sun 9/276:45 am -
Nonstop2h 15m
Fri 10/98:45 pm -
Nonstop2h 05m
Deal found 9/5![Southwest logo]()
$351
This United Airlines deal was found by Cheapflights users on 9/7. 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.
Sat 10/249:00 am -
1 stop4h 35m
Fri 10/307:15 am -
1 stop4h 23m
Deal found 9/7![United Airlines logo]()
$395
This American Airlines deal was found by Cheapflights users on 9/6. 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 9/175:43 am -
1 stop5h 05m
Tue 9/2211:26 am -
2 stops11h 17m
Deal found 9/6![American Airlines logo]()
$487
This United Airlines deal was found by Cheapflights users on 9/9. 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 10/74:39 pm -
1 stop4h 50m
Wed 10/143:15 pm -
1 stop4h 21m
Deal found 9/9![United Airlines logo]()
$399
This Southwest deal was found by Cheapflights users on 9/8. 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.
Sat 10/31:45 pm -
2 stops8h 45m
Tue 10/1311:15 am -
2 stops7h 30m
Deal found 9/8![Southwest logo]()
$365
This American Airlines deal was found by Cheapflights users on 9/6. 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 9/175:43 am -
1 stop5h 05m
Sun 9/206:03 am -
1 stop6h 37m
Deal found 9/6![American Airlines logo]()
$495
This United Airlines deal was found by Cheapflights users on 9/8. 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 11/178:50 am -
1 stop4h 35m
Wed 11/181:27 pm -
1 stop6h 32m
Deal found 9/8![United Airlines logo]()
$405
This Southwest deal was found by Cheapflights users on 9/8. 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.
Thu 10/152:30 pm -
2 stops8h 00m
Sat 10/172:50 pm -
1 stop7h 50m
Deal found 9/8![Southwest logo]()
$370
This United Airlines deal was found by Cheapflights users on 9/9. 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.
Tue 11/178:50 am -
1 stop4h 46m
Wed 11/187:15 am -
1 stop4h 23m
Deal found 9/9![United Airlines logo]()
$405
This Southwest deal was found by Cheapflights users on 9/7. 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.
Fri 2/195:50 pm -
1 stop6h 10m
Tue 2/239:10 am -
1 stop6h 20m
Deal found 9/7![Southwest logo]()
$382
This United Airlines deal was found by Cheapflights users on 9/8. 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.
Sat 11/74:39 pm -
1 stop6h 20m
Tue 11/103:11 pm -
1 stop4h 48m
Deal found 9/8![United Airlines logo]()
$409
This Southwest deal was found by Cheapflights users on 9/7. 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 10/262:20 pm -
1 stop7h 00m
Wed 10/2810:25 am -
1 stop6h 20m
Deal found 9/7![Southwest logo]()
$382
This United Airlines deal was found by Cheapflights users on 9/9. 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.
Sat 1/239:13 am -
1 stop6h 25m
Wed 1/273:16 pm -
1 stop4h 43m
Deal found 9/9![United Airlines logo]()
$409
Last-minute flights from St. Louis to ColoradoDiscover last-minute flight deals from St. Louis to Colorado. Data last updated September 11, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Colorado. Data last updated September 11, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 9/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/308:10 pm -
Nonstop2h 29m
Mon 10/56:40 am -
1 stop8h 54m
Deal found 9/10![Frontier logo]()
$135
This Kiwi.com deal was found by Cheapflights users on 9/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/308:10 pm -
Nonstop2h 29m
Thu 10/86:30 am -
1 stop9h 28m
Deal found 9/10![Frontier logo]()
$143
This Frontier deal was found by Cheapflights users on 9/10. 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.
Fri 10/28:10 pm -
Nonstop2h 29m
Mon 10/56:40 am -
1 stop8h 54m
Deal found 9/10![Frontier logo]()
$141
This American Airlines deal was found by Cheapflights users on 9/10. 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.
Sat 10/35:43 am -
1 stop5h 42m
Wed 10/75:00 pm -
1 stop5h 42m
Deal found 9/10![American Airlines logo]()
$329
This United Airlines deal was found by Cheapflights users on 9/8. 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 10/74:39 pm -
1 stop4h 58m
Wed 10/143:23 pm -
1 stop4h 13m
Deal found 9/8![United Airlines logo]()
$325
This Frontier deal was found by Cheapflights users on 9/9. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/168:00 pm -
Nonstop2h 39m
Mon 10/194:12 pm -
Nonstop2h 03m
Deal found 9/9![Frontier logo]()
$138
This Kiwi.com deal was found by Cheapflights users on 9/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/177:42 pm -
Nonstop2h 27m
Tue 10/206:57 pm -
1 stop21h 43m
Deal found 9/9![Frontier logo]()
$127
This FlightHub deal was found by Cheapflights users on 9/8. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/191:30 pm -
1 stop24h 18m
Sat 10/243:54 pm -
Nonstop2h 03m
Deal found 9/8![Frontier logo]()
$132
This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/214:19 pm -
Nonstop2h 33m
Sat 10/314:09 pm -
Nonstop2h 05m
Deal found 9/10![Frontier logo]()
$136
This Super.com deal was found by Cheapflights users on 9/10. 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 10/214:19 pm -
Nonstop2h 33m
Wed 10/2812:21 pm -
Nonstop2h 02m
Deal found 9/10![Frontier logo]()
$137
This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/231:30 pm -
1 stop7h 20m
Mon 10/264:12 pm -
Nonstop2h 03m
Deal found 9/10![Frontier logo]()
$128
This Frontier deal was found by Cheapflights users on 9/9. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/284:18 pm -
Nonstop2h 30m
Sat 10/3110:40 am -
1 stop11h 36m
Deal found 9/9![Frontier logo]()
$133
One-way flights from St. Louis to ColoradoSearch for one-way flight options from St. Louis to Colorado. Find affordable one-way fares based on user searches. Data last updated September 11, 2026.
Search for one-way flight options from St. Louis to Colorado. Find affordable one-way fares based on user searches. Data last updated September 11, 2026.
This Super.com deal was found by Cheapflights users on 9/10. 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.
Thu 11/191:28 pm -
1 stop11h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/10![Frontier logo]()
$84
This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/91:28 pm -
1 stop11h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/10![Frontier logo]()
$85
This Kiwi.com deal was found by Cheapflights users on 9/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/126:35 pm -
1 stop14h 31m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/9![Frontier logo]()
$87
This Southwest deal was found by Cheapflights users on 9/9. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/129:50 pm -
Nonstop2h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/9![Southwest logo]()
$89
This Kiwi.com deal was found by Cheapflights users on 9/8. 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.
Fri 12/42:59 pm -
1 stop18h 27m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![Frontier logo]()
$90
This Super.com deal was found by Cheapflights users on 9/9. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/94:30 pm -
1 stop28h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/9![Frontier logo]()
$91
This Kiwi.com deal was found by Cheapflights users on 9/7. 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.
Fri 10/306:44 pm -
1 stop14h 38m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![Frontier logo]()
$92
This Frontier deal was found by Cheapflights users on 9/10. 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.
Mon 12/77:49 pm -
Nonstop2h 31m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/10![Frontier logo]()
$94
This Kiwi.com deal was found by Cheapflights users on 9/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/104:30 pm -
1 stop16h 37m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/9![Frontier logo]()
$96
This Kiwi.com deal was found by Cheapflights users on 9/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/84:30 pm -
1 stop16h 37m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/9![Frontier logo]()
$97
This United Airlines deal was found by Cheapflights users on 9/8. 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.
Sat 10/109:00 am -
1 stop4h 41m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![United Airlines logo]()
$163
This Southwest deal was found by Cheapflights users on 9/9. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/56:20 pm -
1 stop6h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/9![Southwest logo]()
$167
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 September 11, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $126 (Frontier) |
One-way from | $84 (Super.com) |
Popular in | June |
Cheapest in | October |
Average price | $273 |
Good round-trip deal | $297 or less |
Good one-way deal | $191 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 7,457,451 searches. Data last updated September 11, 2026.
Use the filters below to find and compare flights from St. Louis to Colorado that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
St. LouisDenver
STL Lambert-St Louis - DEN Denver Intl
STLDEN
Lambert-St Louis
Mon 10/12
9:50 pm-11:15 pm
Nonstop2h 25m
Denver Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$89
St. LouisDenver
STL Lambert-St Louis - DEN Denver Intl
STLDEN
Lambert-St Louis
Wed 10/14
8:50 pm-10:15 pm
Nonstop2h 25m
Denver Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$89
Quickest round-trip
St. LouisDenver
STL Lambert-St Louis - DEN Denver Intl
STLDEN
Lambert-St Louis
Tue 10/20
6:10 pm-7:30 pm
Nonstop2h 20m
Denver Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$89
St. LouisDenver
STL Lambert-St Louis - DEN Denver Intl
STLDEN
Lambert-St Louis
Wed 12/9
7:03 am-1:24 pm
1 stop7h 21m
Denver Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$99
St. LouisDenver
STL Lambert-St Louis - DEN Denver Intl
STLDEN
Lambert-St Louis
Mon 10/5
5:47 pm-11:35 pm
1 stop6h 48m
Denver Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$99
St. LouisDenver
STL Lambert-St Louis - DEN Denver Intl
STLDEN
Lambert-St Louis
Tue 10/27
5:50 am-11:00 am
2 stops6h 10m
Denver Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$104
St. LouisDenver
STL Lambert-St Louis - DEN Denver Intl
STLDEN
Lambert-St Louis
Fri 10/9
9:50 pm-11:15 pm
Nonstop2h 25m
Denver Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$106
St. LouisDenver
STL Lambert-St Louis - DEN Denver Intl
STLDEN
Lambert-St Louis
Tue 12/8
6:05 pm-8:23 am
1 stop15h 18m
Denver Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$115
St. LouisDenver
STL Lambert-St Louis - DEN Denver Intl
STLDEN
Lambert-St Louis
Thu 11/5
6:10 am-7:40 am
Nonstop2h 30m
Denver Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$153
St. LouisDenver
STL Lambert-St Louis - DEN Denver Intl
STLDEN
Lambert-St Louis
Tue 12/1
8:20 pm-9:40 pm
Nonstop2h 20m
Denver Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$153
Showing 1-10 of 60 resultsSorted by cheapest first
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.
STL-DEN
STL-HDN
STL-COS
STL-MTJ
STL-GJT
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
STL-USCO
STL-DEN
STL-HDN
STL-COS
STL-MTJ
What is the cheapest month to book a flight from St. Louis to Colorado?
Currently, October is the cheapest month in which you can book a flight from St. Louis to Colorado (average of $216). Flying from St. Louis to Colorado in July is currently the most expensive (average of $360). 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 September 11, 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 in the morning tend to be the most expensive. A flight in the evening could potentially save you up to 48% on airfare.
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 September 11, 2026.
The most flights from STL to USCO are scheduled on a Wednesday (15 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (4 on average).
How much does it cost to fly round-trip from St. Louis to Colorado?
Airfare is below average for this route at the moment.
St. Louis to Colorado flights typically cost between $188 and $368 in December.The cheapest round-trip price found within the last 5 days was $126 on Frontier (Dec 14-Dec 17).
How far ahead should I book a flight from St. Louis to Colorado?
The best time to book flights from St. Louis to Colorado is 34 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
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 September 5, 2026.
Travelers seeking maximum savings on their St. Louis to Colorado flight should consider departing on Tuesday 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.
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 September 11, 2026.
Peruse reviews from past customers who have flown with Southwest,United Airlines, andAmerican 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.
Comfort
8.0
Crew
8.6
Food
7.0
Overall
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Crew
8.6
Food
7.0
Overall
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Crew
8.6
Food
7.0
Overall
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Crew
8.6
Food
7.0
Overall
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Crew
8.6
Food
7.0
Overall
8.0
Boarding
8.1
Entertainment
7.5
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.
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
Complete your trip
Flights by cabin class
Other flight options
Popular flights
Top destinations
Alternative routes for St. Louis to Colorado
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Colorado by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from St. Louis to Colorado by cabin class
Find flights from St. Louis to Colorado, based on your preferred cabin class, be it economy, premium economy, business, or first class.
St. Louis and Colorado flights
Browse other St. Louis and Colorado flight options. Last updated on September 11, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
St. Louis to Colorado flights
Consider these flights traveling from St. Louis to Colorado.
Top 4 airlines flying from St. Louis to Colorado
Discover the top 4 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 7,457,451 searches. Data last updated September 11, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$56 | Average$175 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$158 | Average$464 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$178 | Average$390 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$190 | Average$367 | FlexibilityNo cancel fee | On-time63% |