$92+ 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 8/16. Fares are subject to change and may not be available on all flights or dates of travel.
STL — DEN
Aug 23 — Aug 301
Round-trip
1 adult, Economy
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Find cheap flights from St. Louis to Colorado with Cheapflights
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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 July 24, 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 July 24, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/22. 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 9/1910:35 am
STL
- DEN
1 stop12h 58m
Frontier
Thu 9/244:12 pm
DEN
- STL
Nonstop2h 03m
Frontier
Deal found 7/22![Frontier logo]()
$137
This Kiwi.com deal was found by Cheapflights users on 7/20. 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 10/210:35 am
STL
- DEN
1 stop23h 56m
Frontier
Sat 10/311:59 pm
DEN
- STL
1 stop8h 41m
Frontier
Deal found 7/20![Frontier logo]()
$138
This Kiwi.com deal was found by Cheapflights users on 7/21. 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 9/910:35 am
STL
- DEN
1 stop12h 58m
Frontier
Sat 9/1211:59 pm
DEN
- STL
1 stop8h 41m
Frontier
Deal found 7/21![Frontier logo]()
$139
This Kiwi.com deal was found by Cheapflights users on 7/22. 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 9/2610:35 am
STL
- DEN
1 stop12h 58m
Frontier
Mon 9/284:12 pm
DEN
- STL
Nonstop2h 03m
Frontier
Deal found 7/22![Frontier logo]()
$142
This Super.com deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/178:10 pm
STL
- DEN
Nonstop2h 39m
Frontier
Mon 9/214:12 pm
DEN
- STL
Nonstop2h 03m
Frontier
Deal found 7/23![Frontier logo]()
$144
This Kiwi.com deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/46:17 pm
STL
- DEN
1 stop16h 02m
Frontier
Sun 9/64:00 pm
DEN
- STL
Nonstop2h 13m
Frontier
Deal found 7/23![Frontier logo]()
$146
This Kiwi.com deal was found by Cheapflights users on 7/20. 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 8/136:34 pm
STL
- DEN
1 stop15h 29m
Frontier
Fri 8/216:30 am
DEN
- STL
1 stop9h 52m
Frontier
Deal found 7/20![Frontier logo]()
$147
This Kiwi.com deal was found by Cheapflights users on 7/20. 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 8/118:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Fri 8/1411:59 pm
DEN
- STL
1 stop7h 58m
Frontier
Deal found 7/20![Frontier logo]()
$148
This Kiwi.com deal was found by Cheapflights users on 7/19. 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 9/248:10 pm
STL
- DEN
Nonstop2h 39m
Frontier
Mon 9/284:12 pm
DEN
- STL
Nonstop2h 03m
Frontier
Deal found 7/19![Frontier logo]()
$150
This American Airlines deal was found by Cheapflights users on 7/19. 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 10/135:40 am
STL
- DRO
1 stop5h 18m
American Airlines
Tue 10/205:03 pm
DRO
- STL
1 stop5h 39m
American Airlines
Deal found 7/19![American Airlines logo]()
$308
This American Airlines deal was found by Cheapflights users on 7/20. 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 8/195:42 am
STL
- GUC
1 stop7h 28m
American Airlines
Sat 8/2212:55 pm
GUC
- STL
1 stop6h 31m
American Airlines
Deal found 7/20![American Airlines logo]()
$309
This United Airlines deal was found by Cheapflights users on 7/20. 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 8/199:30 am
STL
- GUC
2 stops12h 03m
United Airlines
Sat 8/223:15 pm
GUC
- STL
1 stop4h 31m
United Airlines
Deal found 7/20![United Airlines logo]()
$314
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 July 24, 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 July 24, 2026.
This United Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/21:36 pm
STL
- DEN
Nonstop2h 24m
United Airlines
Tue 9/85:32 pm
DEN
- STL
Nonstop2h 06m
United Airlines
Deal found 7/23![United Airlines logo]()
$187
This Southwest deal was found by Cheapflights users on 7/22. 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 9/268:55 am
STL
- DEN
Nonstop2h 15m
Southwest
Mon 9/287:00 am
DEN
- STL
Nonstop2h 00m
Southwest
Deal found 7/22![Southwest logo]()
$187
This American Airlines deal was found by Cheapflights users on 7/20. 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 8/266:36 am
STL
- GUC
1 stop6h 34m
American Airlines
Mon 8/3112:55 pm
GUC
- STL
1 stop6h 31m
American Airlines
Deal found 7/20![American Airlines logo]()
$309
This Delta deal was found by Cheapflights users on 7/22. 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 10/176:00 am
STL
- COS
1 stop7h 25m
Delta
Wed 10/288:00 am
COS
- STL
1 stop8h 34m
Delta
Deal found 7/22![Delta logo]()
$343
This Southwest deal was found by Cheapflights users on 7/22. 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 9/37:40 am
STL
- DEN
1 stop4h 45m
Southwest
Tue 9/811:15 am
DEN
- STL
2 stops5h 40m
Southwest
Deal found 7/22![Southwest logo]()
$212
This United Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/261:36 pm
STL
- DEN
Nonstop2h 24m
United Airlines
Sat 8/291:27 pm
DEN
- STL
Nonstop2h 07m
United Airlines
Deal found 7/23![United Airlines logo]()
$267
This United Airlines deal was found by Cheapflights users on 7/20. 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 8/174:40 pm
STL
- DEN
Nonstop2h 30m
United Airlines
Wed 8/195:35 pm
DEN
- STL
Nonstop2h 11m
United Airlines
Deal found 7/20![United Airlines logo]()
$267
This Southwest deal was found by Cheapflights users on 7/19. 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 9/256:05 pm
STL
- DEN
Nonstop2h 15m
Southwest
Mon 9/288:05 pm
DEN
- STL
Nonstop2h 05m
Southwest
Deal found 7/19![Southwest logo]()
$285
This United Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/155:30 pm
STL
- DEN
1 stop5h 43m
United Airlines
Sat 9/199:35 am
DEN
- STL
Nonstop2h 05m
United Airlines
Deal found 7/23![United Airlines logo]()
$277
This Southwest deal was found by Cheapflights users on 7/19. 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 9/186:05 pm
STL
- DEN
Nonstop2h 15m
Southwest
Mon 9/216:50 pm
DEN
- STL
Nonstop2h 05m
Southwest
Deal found 7/19![Southwest logo]()
$285
This Delta deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/212:25 pm
STL
- COS
1 stop6h 42m
Delta
Tue 10/276:10 pm
COS
- STL
2 stops13h 39m
Delta
Deal found 7/22![Delta logo]()
$348
This Delta deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/212:25 pm
STL
- COS
1 stop6h 42m
Delta
Wed 10/286:10 pm
COS
- STL
2 stops13h 39m
Delta
Deal found 7/22![Delta logo]()
$348
This American Airlines deal was found by Cheapflights users on 7/21. 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 1/65:00 am
STL
- EGE
2 stops12h 58m
American Airlines
Sun 1/108:10 am
EGE
- STL
1 stop5h 37m
American Airlines
Deal found 7/21![American Airlines logo]()
$398
This Southwest deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/198:25 am
STL
- DEN
2 stops5h 40m
Southwest
Thu 9/245:00 am
DEN
- STL
1 stop5h 50m
Southwest
Deal found 7/23![Southwest logo]()
$307
This United Airlines deal was found by Cheapflights users on 7/20. 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 8/199:30 am
STL
- GUC
2 stops12h 03m
United Airlines
Sat 8/223:15 pm
GUC
- STL
1 stop4h 31m
United Airlines
Deal found 7/20![United Airlines logo]()
$314
This United Airlines deal was found by Cheapflights users on 7/21. 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 8/2112:59 pm
STL
- DRO
2 stops10h 01m
United Airlines
Sun 8/237:00 am
DRO
- STL
1 stop4h 40m
United Airlines
Deal found 7/21![United Airlines logo]()
$314
This Delta deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/69:00 am
STL
- EGE
1 stop6h 34m
Delta
Mon 1/113:35 pm
EGE
- STL
1 stop7h 04m
Delta
Deal found 7/19![Delta logo]()
$399
This Southwest deal was found by Cheapflights users on 7/21. 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 8/196:00 am
STL
- COS
2 stops7h 40m
Southwest
Wed 8/261:15 pm
COS
- STL
1 stop6h 55m
Southwest
Deal found 7/21![Southwest logo]()
$338
This American Airlines deal was found by Cheapflights users on 7/20. 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 8/105:42 am
STL
- ASE
1 stop5h 19m
American Airlines
Thu 8/137:00 am
ASE
- STL
1 stop8h 23m
American Airlines
Deal found 7/20![American Airlines logo]()
$455
This United Airlines deal was found by Cheapflights users on 7/21. 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 8/1412:59 pm
STL
- DRO
2 stops10h 01m
United Airlines
Wed 8/197:00 am
DRO
- STL
1 stop4h 40m
United Airlines
Deal found 7/21![United Airlines logo]()
$314
This American Airlines deal was found by Cheapflights users on 7/20. 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 8/185:42 am
STL
- GUC
1 stop7h 28m
American Airlines
Mon 8/2412:55 pm
GUC
- STL
2 stops18h 29m
American Airlines
Deal found 7/20![American Airlines logo]()
$456
This United Airlines deal was found by Cheapflights users on 7/19. 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 8/264:40 pm
STL
- GJT
1 stop6h 19m
United Airlines
Sun 8/301:40 pm
GJT
- STL
1 stop6h 06m
United Airlines
Deal found 7/19![United Airlines logo]()
$319
This Southwest deal was found by Cheapflights users on 7/22. 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 8/173:45 pm
STL
- COS
1 stop5h 10m
Southwest
Fri 8/214:20 pm
COS
- STL
1 stop4h 35m
Southwest
Deal found 7/22![Southwest logo]()
$365
This American Airlines deal was found by Cheapflights users on 7/21. 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 8/45:32 am
STL
- MTJ
1 stop5h 13m
American Airlines
Tue 8/112:21 pm
MTJ
- STL
1 stop5h 05m
American Airlines
Deal found 7/21![American Airlines logo]()
$473
This Southwest deal was found by Cheapflights users on 7/19. 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 8/246:00 am
STL
- COS
1 stop5h 45m
Southwest
Thu 9/310:25 am
COS
- STL
1 stop6h 40m
Southwest
Deal found 7/19![Southwest logo]()
$379
This United Airlines deal was found by Cheapflights users on 7/20. 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.
Sun 8/166:59 pm
STL
- DEN
Nonstop2h 27m
United Airlines
Wed 8/199:35 am
DEN
- STL
Nonstop2h 05m
United Airlines
Deal found 7/20![United Airlines logo]()
$357
This Southwest deal was found by Cheapflights users on 7/19. 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 8/135:30 pm
STL
- COS
1 stop5h 15m
Southwest
Sat 8/152:00 pm
COS
- STL
1 stop7h 20m
Southwest
Deal found 7/19![Southwest logo]()
$379
This United Airlines deal was found by Cheapflights users on 7/22. 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 10/161:36 pm
STL
- GJT
1 stop4h 55m
United Airlines
Wed 10/211:34 pm
GJT
- STL
2 stops8h 25m
United Airlines
Deal found 7/22![United Airlines logo]()
$382
This Southwest deal was found by Cheapflights users on 7/19. 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 8/218:30 am
STL
- COS
2 stops8h 10m
Southwest
Sun 8/236:30 am
COS
- STL
1 stop7h 50m
Southwest
Deal found 7/19![Southwest logo]()
$392
This United Airlines deal was found by Cheapflights users on 7/20. 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 8/1812:59 pm
STL
- DRO
2 stops8h 55m
United Airlines
Mon 8/241:34 pm
DRO
- STL
1 stop6h 12m
United Airlines
Deal found 7/20![United Airlines logo]()
$384
Last-minute flights from St. Louis to ColoradoDiscover last-minute flight deals from St. Louis to Colorado. Data last updated July 24, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Colorado. Data last updated July 24, 2026 and is based on user searches.
This Cheapflightsfares deal was found by Cheapflights users on 7/22. 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 7/22![Frontier logo]()
$151
This Cheapflightsfares deal was found by Cheapflights users on 7/22. 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 8/118:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Sat 8/154:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Deal found 7/22![Frontier logo]()
$149
This Cheapflightsfares deal was found by Cheapflights users on 7/19. 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 8/128:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Sat 8/154:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Deal found 7/19![Frontier logo]()
$156
This Kiwi.com deal was found by Cheapflights users on 7/20. 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 8/136:34 pm
STL
- DEN
1 stop15h 29m
Frontier
Fri 8/216:30 am
DEN
- STL
1 stop9h 52m
Frontier
Deal found 7/20![Frontier logo]()
$147
This Kiwi.com deal was found by Cheapflights users on 7/20. 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 8/138:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Fri 8/1411:59 pm
DEN
- STL
1 stop7h 58m
Frontier
Deal found 7/20![Frontier logo]()
$148
This Kiwi.com deal was found by Cheapflights users on 7/20. 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 8/138:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Sun 8/1611:46 pm
DEN
- STL
1 stop8h 11m
Frontier
Deal found 7/20![Frontier logo]()
$150
This Kiwi.com deal was found by Cheapflights users on 7/19. 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 8/144:57 pm
STL
- DEN
1 stop17h 06m
Frontier
Sun 8/1611:46 pm
DEN
- STL
1 stop8h 11m
Frontier
Deal found 7/19![Frontier logo]()
$155
This American Airlines deal was found by Cheapflights users on 7/19. 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 8/185:42 am
STL
- DRO
1 stop5h 09m
American Airlines
Mon 8/244:47 pm
DRO
- STL
1 stop5h 55m
American Airlines
Deal found 7/19![American Airlines logo]()
$308
This American Airlines deal was found by Cheapflights users on 7/20. 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 8/195:42 am
STL
- GUC
1 stop7h 28m
American Airlines
Sat 8/2212:55 pm
GUC
- STL
1 stop6h 31m
American Airlines
Deal found 7/20![American Airlines logo]()
$309
This United Airlines deal was found by Cheapflights users on 7/20. 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 8/199:30 am
STL
- GUC
2 stops12h 03m
United Airlines
Sat 8/223:15 pm
GUC
- STL
1 stop4h 31m
United Airlines
Deal found 7/20![United Airlines logo]()
$314
This Kiwi.com deal was found by Cheapflights users on 7/21. 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 8/206:17 pm
STL
- DEN
1 stop20h 44m
Frontier
Mon 8/244:00 pm
DEN
- STL
Nonstop2h 13m
Frontier
Deal found 7/21![Frontier logo]()
$157
This Super.com deal was found by Cheapflights users on 7/19. 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 8/277:58 pm
STL
- DEN
Nonstop2h 27m
Frontier
Sun 8/304:00 pm
DEN
- STL
Nonstop2h 13m
Frontier
Deal found 7/19![Frontier logo]()
$159
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 July 24, 2026.
Search for one-way flight options from St. Louis to Colorado. Find affordable one-way fares based on user searches. Data last updated July 24, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/20. 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.
Sun 8/166:34 pm
STL
- DEN
1 stop20h 27m
Frontier
Deal found 7/20![Frontier logo]()
$92
This Southwest deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/225:20 pm
STL
- DEN
Nonstop2h 15m
Southwest
Deal found 7/23![Southwest logo]()
$94
This Frontier deal was found by Cheapflights users on 7/20. 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 9/178:10 pm
STL
- DEN
Nonstop2h 39m
Frontier
Deal found 7/20![Frontier logo]()
$95
This Kiwi.com deal was found by Cheapflights users on 7/19. 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 10/1510:35 am
STL
- DEN
1 stop23h 56m
Frontier
Deal found 7/19![Frontier logo]()
$96
This Kiwi.com deal was found by Cheapflights users on 7/21. 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 9/1910:35 am
STL
- DEN
1 stop12h 58m
Frontier
Deal found 7/21![Frontier logo]()
$97
This Kiwi.com deal was found by Cheapflights users on 7/19. 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 10/178:10 pm
STL
- DEN
Nonstop2h 39m
Frontier
Deal found 7/19![Frontier logo]()
$98
This Southwest deal was found by Cheapflights users on 7/21. 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 9/82:50 pm
STL
- DEN
1 stop3h 30m
Southwest
Deal found 7/21![Southwest logo]()
$99
This Kiwi.com deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/248:10 pm
STL
- DEN
Nonstop2h 39m
Frontier
Deal found 7/23![Frontier logo]()
$100
This Frontier deal was found by Cheapflights users on 7/22. 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 10/228:10 pm
STL
- DEN
Nonstop2h 39m
Frontier
Deal found 7/22![Frontier logo]()
$101
This Cheapflightsfares deal was found by Cheapflights users on 7/19. 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 9/47:58 pm
STL
- DEN
Nonstop2h 27m
Frontier
Deal found 7/19![Frontier logo]()
$102
This Super.com deal was found by Cheapflights users on 7/20. 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 8/78:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 7/20![Frontier logo]()
$103
This Frontier deal was found by Cheapflights users on 7/20. 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.
Sun 10/188:10 pm
STL
- DEN
Nonstop2h 39m
Frontier
Deal found 7/20![Frontier logo]()
$104
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 July 24, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $137 (Kiwi.com) |
One-way from | $92 (Kiwi.com) |
Popular in | June |
Cheapest in | October |
Average price | $326 |
Good round-trip deal | $314 or less |
Good one-way deal | $182 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 July 24, 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 - DEN
STLDEN
Lambert-St Louis
Wed 9/2
1:36 pm-3:00 pm
Nonstop2h 24m
Denver Intl
Tue 9/8
5:32 pm-8:38 pm
Nonstop2h 06m
$187
Quickest round-trip
St. LouisDenver
STL - DEN
STLDEN
Lambert-St Louis
Sat 9/26
8:55 am-10:10 am
Nonstop2h 15m
Denver Intl
Mon 9/28
7:00 am-10:00 am
Nonstop2h 00m
$187
St. LouisDenver
STL - DEN
STLDEN
Lambert-St Louis
Thu 9/3
7:40 am-11:25 am
1 stop4h 45m
Denver Intl
Tue 9/8
11:15 am-5:55 pm
2 stops5h 40m
$212
St. LouisDenver
STL - DEN
STLDEN
Lambert-St Louis
Wed 8/26
1:36 pm-3:00 pm
Nonstop2h 24m
Denver Intl
Sat 8/29
1:27 pm-4:34 pm
Nonstop2h 07m
$267
St. LouisDenver
STL - DEN
STLDEN
Lambert-St Louis
Mon 8/17
4:40 pm-6:10 pm
Nonstop2h 30m
Denver Intl
Wed 8/19
5:35 pm-8:46 pm
Nonstop2h 11m
$267
St. LouisDenver
STL - DEN
STLDEN
Lambert-St Louis
Tue 9/15
5:30 pm-10:13 pm
1 stop5h 43m
Denver Intl
Sat 9/19
9:35 am-12:40 pm
Nonstop2h 05m
$277
St. LouisDenver
STL - DEN
STLDEN
Lambert-St Louis
Fri 9/25
6:05 pm-7:20 pm
Nonstop2h 15m
Denver Intl
Mon 9/28
8:05 pm-11:10 pm
Nonstop2h 05m
$285
St. LouisDenver
STL - DEN
STLDEN
Lambert-St Louis
Fri 9/18
6:05 pm-7:20 pm
Nonstop2h 15m
Denver Intl
Mon 9/21
6:50 pm-9:55 pm
Nonstop2h 05m
$285
St. LouisDenver
STL - DEN
STLDEN
Lambert-St Louis
Sat 9/19
8:25 am-1:05 pm
2 stops5h 40m
Denver Intl
Thu 9/24
5:00 am-11:50 am
1 stop5h 50m
$307
St. LouisGunnison
STL - GUC
STLGUC
Lambert-St Louis
Wed 8/26
6:36 am-12:10 pm
1 stop6h 34m
Gunnison
Mon 8/31
12:55 pm-8:26 pm
1 stop6h 31m
$309
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-DRO
STL-GUC
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-DRO
STL-GUC
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 $198). Flying from St. Louis to Colorado in June is currently the most expensive (average of $356). 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 July 24, 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 51% 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 July 24, 2026.
The most flights from STL to USCO are scheduled on a Monday (16 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (5 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 $184 and $380 in September.The cheapest round-trip price found within the last 5 days was $137 on Frontier (Sep 19-Sep 24).
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 July 18, 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 July 24, 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.
Crew
8.6
Overall
8.0
Food
7.0
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Overall
8.0
Food
7.0
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Overall
8.0
Food
7.0
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Overall
8.0
Food
7.0
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Overall
8.0
Food
7.0
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Related info for your journey
Find useful and relevant information for your journey from St. Louis to Colorado. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for St. Louis to Colorado
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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 July 24, 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 2,558,603 searches. Data last updated July 24, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$56 | Average$156 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$158 | Average$418 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$168 | Average$392 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$177 | Average$354 | FlexibilityNo cancel fee | On-time63% |