$43+ Cheap flights from Colorado to St. Louis (STL)
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 10/7. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — STL
Oct 9 — Oct 161
Round-trip
1 adult, Economy
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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
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Cheapest flights from Colorado to St. LouisExplore 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 September 9, 2026.
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 September 9, 2026.
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.
Wed 10/78:50 pm -
Nonstop2h 09m
Wed 10/144:19 pm -
Nonstop2h 33m
Deal found 9/9![Frontier logo]()
$137
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/96:30 am -
1 stop9h 28m
Sat 10/107:42 pm -
Nonstop2h 27m
Deal found 9/8![Frontier logo]()
$140
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.
Fri 10/234:12 pm -
Nonstop2h 03m
Mon 10/266:35 pm -
1 stop27h 57m
Deal found 9/9![Frontier logo]()
$145
This Priceline 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/166:30 am -
1 stop9h 28m
Fri 10/168:00 pm -
Nonstop2h 39m
Deal found 9/8![Frontier logo]()
$147
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 9/256:40 am -
1 stop8h 54m
Wed 9/308:10 pm -
Nonstop2h 29m
Deal found 9/9![Frontier logo]()
$150
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1510:40 am -
1 stop5h 18m
Mon 10/198:00 pm -
Nonstop2h 39m
Deal found 9/5![Frontier logo]()
$155
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/297:30 am -
1 stop28h 03m
Mon 11/21:28 pm -
1 stop24h 14m
Deal found 9/9![Frontier logo]()
$156
This Expedia 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/86:30 am -
1 stop9h 28m
Mon 10/121:30 pm -
1 stop21h 19m
Deal found 9/9![Frontier logo]()
$158
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 10/173:54 pm -
Nonstop2h 03m
Mon 10/196:35 pm -
1 stop14h 31m
Deal found 9/9![Frontier logo]()
$159
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 10/24:12 pm -
Nonstop2h 05m
Mon 10/52:29 pm -
1 stop18h 35m
Deal found 9/8![Frontier logo]()
$162
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.
Fri 10/231:44 pm -
1 stop5h 52m
Mon 10/264:39 pm -
1 stop4h 52m
Deal found 9/9![United Airlines logo]()
$261
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.
Fri 10/233:31 pm -
1 stop4h 05m
Sun 10/258:50 am -
1 stop4h 36m
Deal found 9/9![United Airlines logo]()
$275
Best flights from Colorado to St. LouisDiscover carefully curated flight deals from Colorado to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 9, 2026.
Discover carefully curated flight deals from Colorado to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 9, 2026.
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.
Thu 10/291:55 pm -
Nonstop2h 02m
Mon 11/21:40 pm -
Nonstop2h 29m
Deal found 9/9![United Airlines logo]()
$177
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 10/88:45 pm -
Nonstop2h 05m
Tue 10/138:30 am -
1 stop3h 55m
Deal found 9/8![Southwest logo]()
$187
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/237:55 am -
Nonstop2h 08m
Sat 11/285:15 pm -
1 stop8h 39m
Deal found 9/9![Frontier logo]()
$287
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/225:08 pm -
1 stop5h 34m
Sun 10/255:40 am -
1 stop5h 18m
Deal found 9/8![American Airlines logo]()
$318
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.
Thu 11/57:40 am -
1 stop5h 35m
Sat 11/72:55 pm -
Nonstop2h 25m
Deal found 9/7![Southwest logo]()
$187
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/28:15 am -
1 stop8h 22m
Sat 10/31:40 pm -
1 stop7h 16m
Deal found 9/6![Delta logo]()
$407
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.
Fri 10/231:44 pm -
1 stop5h 52m
Mon 10/264:39 pm -
1 stop4h 52m
Deal found 9/9![United Airlines logo]()
$261
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.
Fri 10/233:31 pm -
1 stop4h 05m
Sun 10/258:50 am -
1 stop4h 36m
Deal found 9/9![United Airlines logo]()
$275
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 10/155:00 am -
1 stop5h 00m
Sun 10/186:20 am -
Nonstop2h 20m
Deal found 9/8![Southwest logo]()
$297
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 9/3012:01 pm -
1 stop7h 51m
Wed 10/75:40 am -
1 stop5h 51m
Deal found 9/5![American Airlines logo]()
$329
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.
Fri 10/305:52 pm -
Nonstop2h 07m
Tue 11/31:08 pm -
1 stop6h 05m
Deal found 9/9![United Airlines logo]()
$284
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/46:11 pm -
1 stop5h 33m
Tue 10/62:25 pm -
1 stop6h 51m
Deal found 9/6![Delta logo]()
$407
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.
Wed 10/78:10 pm -
Nonstop2h 05m
Thu 10/84:50 pm -
Nonstop2h 20m
Deal found 9/7![Southwest logo]()
$351
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.
Fri 2/191:20 pm -
2 stops8h 59m
Fri 2/264:30 pm -
1 stop4h 57m
Deal found 9/8![United Airlines logo]()
$334
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 10/231:14 pm -
1 stop7h 45m
Sun 10/256:32 am -
1 stop6h 51m
Deal found 9/5![American Airlines logo]()
$406
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/106:00 am -
1 stop6h 20m
Mon 10/122:25 pm -
1 stop6h 51m
Deal found 9/9![Delta logo]()
$417
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.
Thu 10/88:45 pm -
Nonstop2h 05m
Sun 10/119:45 pm -
Nonstop2h 25m
Deal found 9/7![Southwest logo]()
$351
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/26:11 pm -
1 stop5h 33m
Wed 10/77:00 am -
1 stop6h 30m
Deal found 9/6![Delta logo]()
$422
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 10/247:10 am -
2 stops7h 33m
Mon 10/268:50 am -
1 stop4h 36m
Deal found 9/9![United Airlines logo]()
$355
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/236:03 am -
2 stops11h 01m
Sun 9/275:43 am -
1 stop7h 14m
Deal found 9/7![American Airlines logo]()
$442
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.
Sun 10/189:05 pm -
1 stop11h 55m
Thu 10/226:05 am -
1 stop4h 30m
Deal found 9/8![Southwest logo]()
$380
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.
Wed 9/301:43 pm -
1 stop5h 53m
Wed 10/79:00 am -
1 stop4h 41m
Deal found 9/6![United Airlines logo]()
$383
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/22:05 pm -
1 stop8h 10m
Tue 10/68:30 am -
2 stops7h 15m
Deal found 9/6![Southwest logo]()
$393
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 10/108:28 pm -
Nonstop2h 16m
Tue 10/139:00 am -
Nonstop2h 30m
Deal found 9/6![United Airlines logo]()
$385
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.
Fri 11/206:30 am -
Nonstop2h 05m
Sun 11/226:10 am -
Nonstop2h 30m
Deal found 9/8![Southwest logo]()
$397
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 10/247:05 am -
1 stop4h 35m
Wed 10/288:50 am -
1 stop4h 49m
Deal found 9/8![United Airlines logo]()
$399
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.
Sun 10/48:00 am -
1 stop4h 20m
Sun 10/47:00 pm -
Nonstop2h 20m
Deal found 9/9![Southwest logo]()
$403
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 12/51:36 pm -
2 stops8h 38m
Wed 12/99:13 am -
1 stop4h 11m
Deal found 9/9![United Airlines logo]()
$404
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 11/244:35 pm -
2 stops6h 35m
Fri 11/275:10 am -
1 stop7h 25m
Deal found 9/8![Southwest logo]()
$432
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.
Wed 9/303:31 pm -
1 stop4h 05m
Fri 10/24:39 pm -
1 stop4h 54m
Deal found 9/7![United Airlines logo]()
$405
Last-minute flights from Colorado to St. LouisDiscover last-minute flight deals from Colorado to St. Louis. Data last updated September 9, 2026 and is based on user searches.
Discover last-minute flight deals from Colorado to St. Louis. Data last updated September 9, 2026 and is based on user searches.
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 9/256:40 am -
1 stop8h 54m
Wed 9/308:10 pm -
Nonstop2h 29m
Deal found 9/9![Frontier logo]()
$150
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 10/24:12 pm -
Nonstop2h 05m
Mon 10/52:29 pm -
1 stop18h 35m
Deal found 9/8![Frontier logo]()
$162
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.
Wed 10/78:50 pm -
Nonstop2h 09m
Wed 10/144:19 pm -
Nonstop2h 33m
Deal found 9/9![Frontier logo]()
$137
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/86:30 am -
1 stop9h 28m
Mon 10/121:30 pm -
1 stop11h 13m
Deal found 9/8![Frontier logo]()
$158
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/96:30 am -
1 stop9h 28m
Sat 10/107:42 pm -
Nonstop2h 27m
Deal found 9/8![Frontier logo]()
$140
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1510:40 am -
1 stop5h 18m
Mon 10/198:00 pm -
Nonstop2h 39m
Deal found 9/5![Frontier logo]()
$155
This Priceline 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/166:30 am -
1 stop9h 28m
Fri 10/168:00 pm -
Nonstop2h 39m
Deal found 9/8![Frontier logo]()
$147
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 10/173:54 pm -
Nonstop2h 03m
Mon 10/196:35 pm -
1 stop14h 31m
Deal found 9/9![Frontier logo]()
$159
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.
Fri 10/234:12 pm -
Nonstop2h 03m
Mon 10/266:35 pm -
1 stop27h 57m
Deal found 9/9![Frontier logo]()
$145
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.
Fri 10/231:44 pm -
1 stop5h 52m
Mon 10/264:39 pm -
1 stop4h 52m
Deal found 9/9![United Airlines logo]()
$261
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.
Fri 10/233:31 pm -
1 stop4h 05m
Sun 10/258:50 am -
1 stop4h 36m
Deal found 9/9![United Airlines logo]()
$275
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/297:30 am -
1 stop28h 03m
Mon 11/21:28 pm -
1 stop24h 14m
Deal found 9/9![Frontier logo]()
$156
One-way flights from Colorado to St. LouisSearch for one-way flight options from Colorado to St. Louis. Find affordable one-way fares based on user searches. Data last updated September 9, 2026.
Search for one-way flight options from Colorado to St. Louis. Find affordable one-way fares based on user searches. Data last updated September 9, 2026.
This Super.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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/78:50 pm -
Nonstop2h 09m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![Frontier logo]()
$43
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/53:50 pm -
Nonstop2h 04m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![Frontier logo]()
$54
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 10/24:12 pm -
Nonstop2h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/9![Frontier logo]()
$60
This Super.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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/64:09 pm -
Nonstop2h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![Frontier logo]()
$61
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.
Mon 12/73:50 pm -
Nonstop2h 04m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/5![Frontier logo]()
$66
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 10/164:12 pm -
Nonstop2h 03m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/9![Frontier logo]()
$70
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/93:50 pm -
Nonstop2h 04m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![Frontier logo]()
$71
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.
Wed 11/410:43 am -
1 stop5h 57m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/5![Frontier logo]()
$77
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 10/143:23 pm -
1 stop7h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![United Airlines logo]()
$163
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/112:56 pm -
1 stop6h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![American Airlines logo]()
$167
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.
Tue 12/16:05 pm -
2 stops13h 51m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![Delta logo]()
$172
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.
Fri 10/24:20 pm -
1 stop7h 15m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/9![Southwest logo]()
$178
Find 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 September 9, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $137 (Super.com) |
One-way from | $43 (Super.com) |
Popular in | June |
Cheapest in | January |
Average price | $255 |
Good round-trip deal | $218 or less |
Good one-way deal | $106 or less |
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 7,457,451 searches. Data last updated September 9, 2026.
Use the filters below to find and compare flights from Colorado to St. Louis that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
DenverSt. Louis
DEN Denver Intl - STL Lambert-St Louis
DENSTL
Denver Intl
Wed 10/7
8:28 pm-11:44 pm
Nonstop2h 16m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$89
DenverSt. Louis
DEN Denver Intl - STL Lambert-St Louis
DENSTL
Denver Intl
Tue 10/6
8:28 pm-11:44 pm
Nonstop2h 16m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$89
DenverSt. Louis
DEN Denver Intl - STL Lambert-St Louis
DENSTL
Denver Intl
Tue 12/8
12:49 pm-9:28 pm
1 stop7h 39m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$99
DenverSt. Louis
DEN Denver Intl - STL Lambert-St Louis
DENSTL
Denver Intl
Fri 10/9
8:45 pm-11:50 pm
Nonstop2h 05m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$106
DenverSt. Louis
DEN Denver Intl - STL Lambert-St Louis
DENSTL
Denver Intl
Fri 11/27
7:45 am-2:34 pm
1 stop5h 49m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$116
DenverSt. Louis
DEN Denver Intl - STL Lambert-St Louis
DENSTL
Denver Intl
Tue 10/20
8:00 am-4:28 pm
1 stop7h 28m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$126
DenverSt. Louis
DEN Denver Intl - STL Lambert-St Louis
DENSTL
Denver Intl
Sun 11/8
10:44 pm-12:33 pm
1 stop12h 49m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$149
Quickest round-trip
DenverSt. Louis
DEN Denver Intl - STL Lambert-St Louis
DENSTL
Denver Intl
Thu 11/26
11:15 am-2:10 pm
Nonstop1h 55m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$153
DenverSt. Louis
DEN Denver Intl - STL Lambert-St Louis
DENSTL
Denver Intl
Fri 10/9
12:59 am-9:49 am
1 stop7h 50m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$163
MontroseSt. Louis
MTJ Montrose County - STL Lambert-St Louis
MTJSTL
Montrose County
Wed 10/14
3:23 pm-11:44 pm
1 stop7h 21m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$163
Showing 1-10 of 60 resultsSorted by cheapest first
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.
DEN-STL
EGE-STL
MTJ-STL
COS-STL
GUC-STL
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
USCO-STL
DEN-STL
EGE-STL
MTJ-STL
COS-STL
What is the cheapest month to book a flight from Colorado to St. Louis?
Currently, January is the cheapest month in which you can book a flight from Colorado to St. Louis (average of $185). Flying from Colorado to St. Louis in June is currently the most expensive (average of $359). 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 September 9, 2026.
It’s optimal to fly from Colorado to St. Louis in the afternoon. By choosing this option you can save up to 20% on the cost of your flight, compared to a flight at noon.
Weekly flight availability from Colorado to St. Louis
Explore weekly flight availability from Colorado to St. Louis. 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 9, 2026.
The most flights from USCO to STL are scheduled on a Monday (14 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (6 on average).
How much does it cost to fly round-trip from Colorado to St. Louis?
Airfare is below average for this route at the moment.
Colorado to St. Louis flights typically cost between $188 and $321 in October.The cheapest round-trip price found within the last 5 days was $137 on Frontier (Oct 7-Oct 14).
How far ahead should I book a flight from Colorado to St. Louis?
The best time to book flights from Colorado to St. Louis is 50 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 Colorado to St. Louis?
Use this chart to determine the cheapest time to fly round-trip from Colorado to St. Louis. Price data was last updated on September 5, 2026.
Travelers seeking maximum savings on their Colorado to St. Louis flight should consider departing on Saturday afternoons when fares are most often at their lowest. Monday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
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.
Traveling to a place near St. Louis?
Book flights to St. Louis if you plan to visit one of these locationsFairview Heights
O'Fallon
Fenton
Swansea
Eureka
Maryland Heights
Collinsville
Wentzville
Edwardsville
Glencoe
Chesterfield
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Alternative routes for Colorado to St. Louis
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Colorado and St. Louis flights
Browse other Colorado and St. Louis flight options. Last updated on September 9, 2026.
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Check out other popular destinations found by fellow travelers in 2026
Other flights to St. Louis
Explore flights to St. Louis departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 9, 2026.
Colorado to St. Louis flights
Consider these flights traveling from Colorado to St. Louis.
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 7,457,451 searches. Data last updated September 9, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$58 | Average$205 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$182 | Average$402 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$198 | Average$383 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$268 | Average$442 | FlexibilityNo cancel fee | On-time71% |