$79+ 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 7/1. Fares are subject to change and may not be available on all flights or dates of travel.
STL — DEN
Jul 12 — Jul 191
Round-trip
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 June 12, 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 June 12, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/8. 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.
Thu 8/208:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Tue 8/254:12 pm
DEN
- STL
Nonstop2h 11m
Frontier
Deal found 6/8![Frontier logo]()
$142
This Frontier deal was found by Cheapflights users on 6/9. 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 7/18:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Wed 7/84:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Deal found 6/9![Frontier logo]()
$143
This Kiwi.com deal was found by Cheapflights users on 6/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/178:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Tue 8/189:25 pm
DEN
- STL
1 stop16h 23m
Frontier
Deal found 6/11![Frontier logo]()
$145
This Frontier deal was found by Cheapflights users on 6/9. 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 8/58:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Tue 8/114:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Deal found 6/9![Frontier logo]()
$147
This Kiwi.com deal was found by Cheapflights users on 6/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/268:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Wed 9/24:12 pm
DEN
- STL
Nonstop2h 11m
Frontier
Deal found 6/11![Frontier logo]()
$151
This Kiwi.com deal was found by Cheapflights users on 6/9. 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.
Tue 8/43:41 pm
STL
- DEN
1 stop8h 14m
Frontier
Tue 8/114:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Deal found 6/9![Frontier logo]()
$152
This Frontier deal was found by Cheapflights users on 6/11. 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.
Tue 7/218:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Sat 7/254:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Deal found 6/11![Frontier logo]()
$153
This Cheapflightsfares deal was found by Cheapflights users on 6/10. 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 8/108:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Thu 8/134:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Deal found 6/10![Frontier logo]()
$154
This Frontier deal was found by Cheapflights users on 6/9. 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.
Sat 8/88:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Mon 8/174:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Deal found 6/9![Frontier logo]()
$156
This Kiwi.com deal was found by Cheapflights users on 6/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/253:33 pm
STL
- DEN
1 stop9h 20m
Frontier
Tue 9/19:25 pm
DEN
- STL
1 stop16h 23m
Frontier
Deal found 6/11![Frontier logo]()
$160
This Cheapflightsfares deal was found by Cheapflights users on 6/10. 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.
Thu 8/68:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Wed 8/124:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Deal found 6/10![Frontier logo]()
$161
This Frontier deal was found by Cheapflights users on 6/9. 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.
Sat 8/88:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Tue 8/114:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Deal found 6/9![Frontier logo]()
$163
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 June 12, 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 June 12, 2026.
This Southwest deal was found by Cheapflights users on 6/9. 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.
Wed 9/238:45 pm
STL
- DEN
Nonstop2h 15m
Southwest
Mon 9/286:25 am
DEN
- STL
Nonstop2h 00m
Southwest
Deal found 6/9![Southwest logo]()
$252
This Delta deal was found by Cheapflights users on 6/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/2611:51 am
STL
- COS
2 stops11h 39m
Delta
Wed 12/25:55 pm
COS
- STL
1 stop5h 41m
Delta
Deal found 6/11![Delta logo]()
$269
This American Airlines deal was found by Cheapflights users on 6/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/268:36 am
STL
- MTJ
1 stop5h 54m
American Airlines
Wed 9/22:21 pm
MTJ
- STL
1 stop5h 05m
American Airlines
Deal found 6/11![American Airlines logo]()
$276
This United Airlines deal was found by Cheapflights users on 6/10. 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 10/279:13 am
STL
- HDN
1 stop4h 22m
United Airlines
Wed 10/281:29 pm
HDN
- STL
1 stop6h 30m
United Airlines
Deal found 6/10![United Airlines logo]()
$291
This Kiwi.com deal was found by Cheapflights users on 6/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/17:46 pm
STL
- GJT
1 stop17h 27m
Multiple Airlines
Sun 7/51:23 pm
GJT
- STL
1 stop27h 52m
Multiple Airlines
Deal found 6/11![Multiple Airlines logo]()
$389
This Southwest deal was found by Cheapflights users on 6/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2712:40 pm
STL
- DEN
Nonstop2h 15m
Southwest
Sat 10/318:10 am
DEN
- STL
1 stop5h 10m
Southwest
Deal found 6/11![Southwest logo]()
$262
This Delta deal was found by Cheapflights users on 6/8. 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 9/196:25 am
STL
- DEN
1 stop4h 38m
Delta
Wed 9/235:45 pm
DEN
- STL
1 stop4h 35m
Delta
Deal found 6/8![Delta logo]()
$271
This United Airlines deal was found by Cheapflights users on 6/10. 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.
Wed 7/84:48 pm
STL
- GJT
1 stop4h 46m
United Airlines
Wed 7/153:15 pm
GJT
- STL
1 stop7h 42m
United Airlines
Deal found 6/10![United Airlines logo]()
$299
This Southwest deal was found by Cheapflights users on 6/9. 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.
Wed 9/168:45 pm
STL
- DEN
Nonstop2h 15m
Southwest
Sun 9/206:05 am
DEN
- STL
Nonstop2h 00m
Southwest
Deal found 6/9![Southwest logo]()
$294
This United Airlines deal was found by Cheapflights users on 6/10. 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.
Wed 9/165:10 am
STL
- DEN
Nonstop2h 33m
United Airlines
Wed 9/235:32 pm
DEN
- STL
Nonstop2h 06m
United Airlines
Deal found 6/10![United Airlines logo]()
$301
This American Airlines deal was found by Cheapflights users on 6/8. 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.
Wed 7/227:07 am
STL
- GUC
1 stop5h 55m
American Airlines
Tue 7/2812:45 pm
GUC
- STL
1 stop8h 03m
American Airlines
Deal found 6/8![American Airlines logo]()
$359
This Southwest deal was found by Cheapflights users on 6/8. 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 11/185:30 pm
STL
- COS
1 stop5h 05m
Southwest
Sun 11/225:00 am
COS
- STL
1 stop6h 40m
Southwest
Deal found 6/8![Southwest logo]()
$314
This United Airlines deal was found by Cheapflights users on 6/10. 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 7/214:48 pm
STL
- DRO
1 stop4h 34m
United Airlines
Tue 7/286:05 pm
DRO
- STL
1 stop4h 52m
United Airlines
Deal found 6/10![United Airlines logo]()
$328
This Kiwi.com deal was found by Cheapflights users on 6/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/67:10 pm
STL
- GJT
1 stop18h 03m
Multiple Airlines
Sun 7/121:23 pm
GJT
- STL
1 stop27h 52m
Multiple Airlines
Deal found 6/11![Multiple Airlines logo]()
$400
This Southwest deal was found by Cheapflights users on 6/8. 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 7/88:35 am
STL
- DEN
2 stops6h 00m
Southwest
Tue 8/48:55 am
DEN
- STL
2 stops6h 30m
Southwest
Deal found 6/8![Southwest logo]()
$314
This Delta deal was found by Cheapflights users on 6/9. 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.
Sun 8/303:39 pm
STL
- COS
1 stop6h 59m
Delta
Thu 9/36:16 pm
COS
- STL
1 stop5h 25m
Delta
Deal found 6/9![Delta logo]()
$387
This American Airlines deal was found by Cheapflights users on 6/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/155:32 am
STL
- DRO
1 stop5h 19m
American Airlines
Wed 7/225:06 pm
DRO
- STL
1 stop5h 52m
American Airlines
Deal found 6/11![American Airlines logo]()
$387
This United Airlines deal was found by Cheapflights users on 6/8. 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.
Mon 9/144:40 pm
STL
- HDN
1 stop4h 44m
United Airlines
Fri 9/181:30 pm
HDN
- STL
1 stop6h 08m
United Airlines
Deal found 6/8![United Airlines logo]()
$340
This Southwest deal was found by Cheapflights users on 6/10. 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.
Wed 7/88:35 am
STL
- DEN
2 stops6h 00m
Southwest
Wed 7/157:00 am
DEN
- STL
1 stop5h 05m
Southwest
Deal found 6/10![Southwest logo]()
$317
This Delta deal was found by Cheapflights users on 6/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/97:05 pm
STL
- DEN
1 stop6h 18m
Delta
Sat 10/1012:59 am
DEN
- STL
1 stop6h 13m
Delta
Deal found 6/11![Delta logo]()
$387
This American Airlines deal was found by Cheapflights users on 6/8. 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.
Sun 7/55:32 am
STL
- ASE
1 stop5h 29m
American Airlines
Sat 7/117:25 am
ASE
- STL
1 stop5h 40m
American Airlines
Deal found 6/8![American Airlines logo]()
$394
This United Airlines deal was found by Cheapflights users on 6/8. 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 7/145:10 am
STL
- ASE
1 stop4h 36m
United Airlines
Fri 7/176:12 pm
ASE
- STL
1 stop4h 45m
United Airlines
Deal found 6/8![United Airlines logo]()
$347
This Southwest deal was found by Cheapflights users on 6/8. 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 7/16:20 pm
STL
- COS
1 stop5h 35m
Southwest
Sat 7/45:55 am
COS
- STL
2 stops7h 50m
Southwest
Deal found 6/8![Southwest logo]()
$322
This American Airlines deal was found by Cheapflights users on 6/10. 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 8/255:42 am
STL
- ASE
1 stop7h 38m
American Airlines
Sat 8/292:20 pm
ASE
- STL
1 stop5h 06m
American Airlines
Deal found 6/10![American Airlines logo]()
$394
This United Airlines deal was found by Cheapflights users on 6/11. 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 8/185:10 am
STL
- COS
1 stop6h 34m
United Airlines
Wed 8/191:03 pm
COS
- STL
2 stops7h 57m
United Airlines
Deal found 6/11![United Airlines logo]()
$354
This American Airlines deal was found by Cheapflights users on 6/7. 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.
Mon 7/135:27 am
STL
- GUC
1 stop7h 35m
American Airlines
Sat 7/1812:45 pm
GUC
- STL
1 stop6h 08m
American Airlines
Deal found 6/7![American Airlines logo]()
$411
This Southwest deal was found by Cheapflights users on 6/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/269:40 am
STL
- COS
2 stops8h 20m
Southwest
Wed 12/212:00 pm
COS
- STL
2 stops8h 20m
Southwest
Deal found 6/11![Southwest logo]()
$344
This United Airlines deal was found by Cheapflights users on 6/7. 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.
Thu 9/179:00 am
STL
- DEN
Nonstop2h 31m
United Airlines
Sun 9/205:32 pm
DEN
- STL
Nonstop2h 06m
United Airlines
Deal found 6/7![United Airlines logo]()
$367
This Southwest deal was found by Cheapflights users on 6/8. 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 9/103:45 pm
STL
- COS
1 stop5h 10m
Southwest
Sun 9/134:50 pm
COS
- STL
1 stop5h 35m
Southwest
Deal found 6/8![Southwest logo]()
$345
This American Airlines deal was found by Cheapflights users on 6/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/89:44 am
STL
- DRO
2 stops9h 28m
American Airlines
Tue 7/145:06 pm
DRO
- STL
1 stop5h 52m
American Airlines
Deal found 6/9![American Airlines logo]()
$440
Last-minute flights from St. Louis to ColoradoDiscover last-minute flight deals from St. Louis to Colorado. Data last updated June 12, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Colorado. Data last updated June 12, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 6/10. 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 6/308:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Sat 7/43:41 pm
DEN
- STL
Nonstop2h 12m
Frontier
Deal found 6/10![Frontier logo]()
$171
This Frontier deal was found by Cheapflights users on 6/9. 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 7/18:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Wed 7/84:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Deal found 6/9![Frontier logo]()
$143
This Expedia deal was found by Cheapflights users on 6/7. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/18:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Wed 7/294:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Deal found 6/7![Frontier logo]()
$165
This Cheapflightsfares deal was found by Cheapflights users on 6/11. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/18:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Tue 7/144:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Deal found 6/11![Frontier logo]()
$168
This Cheapflightsfares deal was found by Cheapflights users on 6/9. 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.
Wed 7/18:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Sat 7/43:41 pm
DEN
- STL
Nonstop2h 12m
Frontier
Deal found 6/9![Frontier logo]()
$169
This Cheapflightsfares deal was found by Cheapflights users on 6/11. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/27:38 pm
STL
- DEN
Nonstop2h 26m
Frontier
Wed 7/84:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Deal found 6/11![Frontier logo]()
$166
This Frontier deal was found by Cheapflights users on 6/11. 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 7/68:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Mon 7/134:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Deal found 6/11![Frontier logo]()
$178
This American Airlines deal was found by Cheapflights users on 6/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/85:32 am
STL
- COS
1 stop5h 20m
American Airlines
Wed 7/155:15 pm
COS
- STL
1 stop5h 43m
American Airlines
Deal found 6/11![American Airlines logo]()
$237
This Kiwi.com deal was found by Cheapflights users on 6/8. 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.
Tue 7/148:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Wed 7/154:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Deal found 6/8![Frontier logo]()
$177
This Cheapflightsfares deal was found by Cheapflights users on 6/7. 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.
Tue 7/148:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Sat 7/184:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Deal found 6/7![Frontier logo]()
$181
This Frontier deal was found by Cheapflights users on 6/11. 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.
Tue 7/218:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Sat 7/254:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Deal found 6/11![Frontier logo]()
$153
This Cheapflightsfares deal was found by Cheapflights users on 6/8. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/218:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Tue 7/284:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Deal found 6/8![Frontier logo]()
$170
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 June 12, 2026.
Search for one-way flight options from St. Louis to Colorado. Find affordable one-way fares based on user searches. Data last updated June 12, 2026.
This Frontier deal was found by Cheapflights users on 6/10. 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 7/18:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/10![Frontier logo]()
$79
This Frontier deal was found by Cheapflights users on 6/10. 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 8/58:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/10![Frontier logo]()
$81
This Kiwi.com deal was found by Cheapflights users on 6/10. 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.
Tue 8/43:41 pm
STL
- DEN
1 stop8h 14m
Frontier
Deal found 6/10![Frontier logo]()
$83
This Kiwi.com deal was found by Cheapflights users on 6/10. 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.
Mon 9/78:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/10![Frontier logo]()
$84
This Frontier deal was found by Cheapflights users on 6/11. 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 7/68:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/11![Frontier logo]()
$89
This Frontier deal was found by Cheapflights users on 6/11. 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.
Sat 7/118:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/11![Frontier logo]()
$90
This Kiwi.com deal was found by Cheapflights users on 6/10. 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 8/268:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/10![Frontier logo]()
$91
This Super.com deal was found by Cheapflights users on 6/10. 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 8/68:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/10![Frontier logo]()
$96
This Kiwi.com deal was found by Cheapflights users on 6/9. 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 8/37:10 pm
STL
- DEN
1 stop9h 38m
Frontier
Deal found 6/9![Frontier logo]()
$103
This Cheapflightsfares deal was found by Cheapflights users on 6/9. 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.
Tue 7/78:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/9![Frontier logo]()
$104
This United Airlines deal was found by Cheapflights users on 6/7. 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 7/15:10 am
STL
- COS
1 stop4h 31m
United Airlines
Deal found 6/7![United Airlines logo]()
$138
This Southwest deal was found by Cheapflights users on 6/10. 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 9/103:45 pm
STL
- COS
1 stop5h 10m
Southwest
Deal found 6/10![Southwest logo]()
$152
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 June 12, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $142 (Kiwi.com) |
One-way from | $79 (Frontier) |
Popular in | June |
Cheapest in | October |
Average price | $337 |
Good round-trip deal | $301 or less |
Good one-way deal | $167 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 June 12, 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
Quickest round-trip
St. LouisDenver
STL - DEN
STLDEN
Lambert-St Louis
Wed 9/23
8:45 pm-10:00 pm
Nonstop2h 15m
Denver Intl
Mon 9/28
6:25 am-9:25 am
Nonstop2h 00m
$252
St. LouisDenver
STL - DEN
STLDEN
Lambert-St Louis
Tue 10/27
12:40 pm-1:55 pm
Nonstop2h 15m
Denver Intl
Sat 10/31
8:10 am-2:20 pm
1 stop5h 10m
$262
St. LouisColorado Springs
STL - COS
STLCOS
Lambert-St Louis
Thu 11/26
11:51 am-10:30 pm
2 stops11h 39m
Colorado Springs
Wed 12/2
5:55 pm-12:36 am
1 stop5h 41m
$269
St. LouisDenver
STL - DEN
STLDEN
Lambert-St Louis
Sat 9/19
6:25 am-10:03 am
1 stop4h 38m
Denver Intl
Wed 9/23
5:45 pm-11:20 pm
1 stop4h 35m
$271
St. LouisMontrose
STL - MTJ
STLMTJ
Lambert-St Louis
Wed 8/26
8:36 am-1:30 pm
1 stop5h 54m
Montrose County
Wed 9/2
2:21 pm-8:26 pm
1 stop5h 05m
$276
St. LouisHayden
STL - HDN
STLHDN
Lambert-St Louis
Tue 10/27
9:13 am-12:35 pm
1 stop4h 22m
Hayden Yampa Valley
Wed 10/28
1:29 pm-8:59 pm
1 stop6h 30m
$291
St. LouisDenver
STL - DEN
STLDEN
Lambert-St Louis
Wed 9/16
8:45 pm-10:00 pm
Nonstop2h 15m
Denver Intl
Sun 9/20
6:05 am-9:05 am
Nonstop2h 00m
$294
St. LouisGrand Junction
STL - GJT
STLGJT
Lambert-St Louis
Wed 7/8
4:48 pm-8:34 pm
1 stop4h 46m
Grand Junction Regnl
Wed 7/15
3:15 pm-11:57 pm
1 stop7h 42m
$299
St. LouisDenver
STL - DEN
STLDEN
Lambert-St Louis
Wed 9/16
5:10 am-6:43 am
Nonstop2h 33m
Denver Intl
Wed 9/23
5:32 pm-8:38 pm
Nonstop2h 06m
$301
St. LouisColorado Springs
STL - COS
STLCOS
Lambert-St Louis
Wed 11/18
5:30 pm-9:35 pm
1 stop5h 05m
Colorado Springs
Sun 11/22
5:00 am-12:40 pm
1 stop6h 40m
$314
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-COS
STL-MTJ
STL-HDN
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-COS
STL-MTJ
STL-HDN
What is the cheapest month to book a flight from St. Louis to Colorado?
Currently, April is the cheapest month in which you can book a flight from St. Louis to Colorado (average of $34). Flying from St. Louis to Colorado in June is currently the most expensive (average of $88). 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 June 12, 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 52% 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 June 12, 2026.
The most flights from STL to USCO are scheduled on a Tuesday (16 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (6 on average).
How much does it cost to fly round-trip from St. Louis to Colorado?
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 June 8, 2026.
Travelers seeking maximum savings on their St. Louis to Colorado flight should consider departing on Saturday evenings when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
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 June 12, 2026.
Peruse reviews from past customers who have flown with Southwest,Delta, andUnited 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
Boarding
8.1
Crew
8.6
Entertainment
7.5
Overall
7.9
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Overall
7.9
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Overall
7.9
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Overall
7.9
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Overall
7.9
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Overall
7.9
Food
7.0
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
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Complete your trip
Complete your trip to Colorado by adding a car rental and/or hotel reservation to your travel itinerary.
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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 June 12, 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 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 June 12, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$56 | Average$145 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$163 | Average$331 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$170 | Average$387 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$178 | Average$334 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$228 | Average$399 | FlexibilityNo cancel fee | On-time71% |