$35+ 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 6/6. Fares are subject to change and may not be available on all flights or dates of travel.
STL — DEN
May 23 — May 301
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from St. Louis to Colorado with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from St. Louis to Colorado
Cheapest
Best
Last-minute
One-way
Cheapest flights from St. Louis to ColoradoExplore the most affordable flight options available from St. Louis to Colorado. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 23, 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 April 23, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/19. 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 5/98:08 pm
STL
- DEN
Nonstop2h 33m
Frontier
Mon 5/184:15 pm
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 4/19![Frontier logo]()
$97
This Cheapflightsfares deal was found by Cheapflights users on 4/22. 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 5/268:08 pm
STL
- DEN
Nonstop2h 33m
Frontier
Wed 5/274:15 pm
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 4/22![Frontier logo]()
$98
This Cheapflightsfares deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” 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 5/1412:36 pm
STL
- DEN
1 stop15h 49m
Frontier
Sat 5/234:15 pm
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 4/18![Frontier logo]()
$104
This Cheapflightsfares deal was found by Cheapflights users on 4/19. 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.
Sat 5/28:17 pm
STL
- DEN
Nonstop2h 33m
Frontier
Sat 5/94:15 pm
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 4/19![Frontier logo]()
$107
This Cheapflightsfares deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” 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 5/88:08 pm
STL
- DEN
Nonstop2h 33m
Frontier
Mon 5/114:15 pm
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 4/18![Frontier logo]()
$108
This Cheapflightsfares deal was found by Cheapflights users on 4/19. 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.
Sat 5/98:08 pm
STL
- DEN
Nonstop2h 33m
Frontier
Tue 5/1211:54 pm
DEN
- STL
1 stop8h 01m
Frontier
Deal found 4/19![Frontier logo]()
$113
This Super.com deal was found by Cheapflights users on 4/19. 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.
Sat 5/98:08 pm
STL
- DEN
Nonstop2h 33m
Frontier
Sat 5/164:15 pm
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 4/19![Frontier logo]()
$117
This Cheapflightsfares deal was found by Cheapflights users on 4/21. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/48:08 pm
STL
- DEN
Nonstop2h 33m
Frontier
Sat 6/64:15 pm
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 4/21![Frontier logo]()
$119
This Super.com deal was found by Cheapflights users on 4/21. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/288:08 pm
STL
- DEN
Nonstop2h 33m
Frontier
Wed 6/34:15 pm
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 4/21![Frontier logo]()
$120
This Cheapflightsfares deal was found by Cheapflights users on 4/20. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/148:08 pm
STL
- DEN
Nonstop2h 33m
Frontier
Mon 5/184:15 pm
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 4/20![Frontier logo]()
$121
This American Airlines deal was found by Cheapflights users on 4/21. 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 5/126:11 pm
STL
- COS
1 stop5h 14m
American Airlines
Tue 5/195:13 pm
COS
- STL
1 stop4h 46m
American Airlines
Deal found 4/21![American Airlines logo]()
$239
This Delta deal was found by Cheapflights users on 4/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/186:30 am
STL
- COS
1 stop4h 32m
Delta
Thu 8/205:55 pm
COS
- STL
1 stop5h 41m
Delta
Deal found 4/20![Delta logo]()
$240
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 April 23, 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 April 23, 2026.
This United Airlines deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” 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 5/68:46 am
STL
- HDN
1 stop4h 47m
United Airlines
Sat 5/233:20 pm
HDN
- STL
1 stop7h 37m
United Airlines
Deal found 4/18![United Airlines logo]()
$285
This Southwest deal was found by Cheapflights users on 4/21. 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 8/182:45 pm
STL
- COS
2 stops8h 00m
Southwest
Thu 8/2011:20 am
COS
- STL
2 stops7h 50m
Southwest
Deal found 4/21![Southwest logo]()
$287
This American Airlines deal was found by Cheapflights users on 4/22. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/75:20 am
STL
- DRO
1 stop7h 51m
American Airlines
Mon 5/115:04 pm
DRO
- STL
1 stop4h 55m
American Airlines
Deal found 4/22![American Airlines logo]()
$288
This Delta deal was found by Cheapflights users on 4/21. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/293:50 pm
STL
- COS
2 stops7h 39m
Delta
Sun 8/306:00 am
COS
- STL
1 stop7h 38m
Delta
Deal found 4/21![Delta logo]()
$302
This United Airlines deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” 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 5/62:35 pm
STL
- HDN
1 stop6h 42m
United Airlines
Sat 5/91:40 pm
HDN
- STL
2 stops8h 39m
United Airlines
Deal found 4/18![United Airlines logo]()
$290
This American Airlines deal was found by Cheapflights users on 4/21. 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.
Mon 8/176:42 am
STL
- GUC
1 stop6h 28m
American Airlines
Sat 8/2212:56 pm
GUC
- STL
1 stop6h 30m
American Airlines
Deal found 4/21![American Airlines logo]()
$290
This Southwest deal was found by Cheapflights users on 4/21. 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.
Thu 5/149:40 pm
STL
- DEN
Nonstop2h 20m
Southwest
Sun 5/176:25 am
DEN
- STL
1 stop5h 00m
Southwest
Deal found 4/21![Southwest logo]()
$314
This Delta deal was found by Cheapflights users on 4/19. 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 6/243:57 pm
STL
- GJT
2 stops6h 53m
Delta
Mon 6/296:56 pm
GJT
- STL
1 stop4h 43m
Delta
Deal found 4/19![Delta logo]()
$314
This United Airlines deal was found by Cheapflights users on 4/20. 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 5/58:46 am
STL
- HDN
1 stop4h 47m
United Airlines
Sat 5/91:40 pm
HDN
- STL
1 stop6h 03m
United Airlines
Deal found 4/20![United Airlines logo]()
$299
This American Airlines deal was found by Cheapflights users on 4/21. 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 5/612:27 pm
STL
- GJT
2 stops11h 15m
American Airlines
Tue 5/1211:46 am
GJT
- STL
2 stops10h 13m
American Airlines
Deal found 4/21![American Airlines logo]()
$309
This Southwest deal was found by Cheapflights users on 4/19. 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.
Tue 5/126:35 am
STL
- DEN
Nonstop2h 20m
Southwest
Sat 5/1611:55 pm
DEN
- STL
1 stop6h 45m
Southwest
Deal found 4/19![Southwest logo]()
$322
This United Airlines deal was found by Cheapflights users on 4/22. 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.
Wed 5/62:35 pm
STL
- MTJ
1 stop6h 43m
United Airlines
Sat 5/91:43 pm
MTJ
- STL
1 stop6h 00m
United Airlines
Deal found 4/22![United Airlines logo]()
$299
This American Airlines deal was found by Cheapflights users on 4/22. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/217:03 am
STL
- EGE
1 stop7h 28m
American Airlines
Tue 5/262:12 pm
EGE
- STL
1 stop6h 30m
American Airlines
Deal found 4/22![American Airlines logo]()
$325
This Southwest deal was found by Cheapflights users on 4/20. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/172:15 pm
STL
- COS
1 stop6h 40m
Southwest
Sun 9/206:05 am
COS
- STL
1 stop5h 55m
Southwest
Deal found 4/20![Southwest logo]()
$325
This United Airlines deal was found by Cheapflights users on 4/19. 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 6/244:48 pm
STL
- GJT
1 stop4h 46m
United Airlines
Mon 6/296:10 pm
GJT
- STL
1 stop4h 47m
United Airlines
Deal found 4/19![United Airlines logo]()
$299
This Delta deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” 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 8/57:08 am
STL
- COS
1 stop7h 06m
Delta
Sun 8/96:00 am
COS
- STL
1 stop7h 35m
Delta
Deal found 4/18![Delta logo]()
$386
This American Airlines deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” 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 6/242:33 pm
STL
- ASE
1 stop7h 41m
American Airlines
Sat 6/277:00 am
ASE
- STL
1 stop6h 03m
American Airlines
Deal found 4/18![American Airlines logo]()
$329
This United Airlines deal was found by Cheapflights users on 4/20. 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 5/198:46 am
STL
- HDN
1 stop4h 47m
United Airlines
Tue 5/263:20 pm
HDN
- STL
1 stop7h 37m
United Airlines
Deal found 4/20![United Airlines logo]()
$301
This Southwest deal was found by Cheapflights users on 4/21. 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.
Sat 7/253:50 pm
STL
- COS
1 stop5h 45m
Southwest
Sat 8/15:00 am
COS
- STL
1 stop5h 25m
Southwest
Deal found 4/21![Southwest logo]()
$333
This American Airlines deal was found by Cheapflights users on 4/19. 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 6/307:00 am
STL
- ASE
1 stop7h 15m
American Airlines
Wed 7/811:20 am
ASE
- STL
1 stop8h 09m
American Airlines
Deal found 4/19![American Airlines logo]()
$329
This Southwest deal was found by Cheapflights users on 4/19. 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.
Sun 6/287:35 pm
STL
- COS
1 stop6h 10m
Southwest
Sat 7/410:30 am
COS
- STL
1 stop6h 35m
Southwest
Deal found 4/19![Southwest logo]()
$333
This United Airlines deal was found by Cheapflights users on 4/20. 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.
Fri 5/224:48 pm
STL
- EGE
1 stop4h 42m
United Airlines
Wed 5/273:25 pm
EGE
- STL
1 stop7h 32m
United Airlines
Deal found 4/20![United Airlines logo]()
$320
This Southwest deal was found by Cheapflights users on 4/23. 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.
Thu 6/45:40 am
STL
- COS
1 stop9h 20m
Southwest
Sun 6/78:55 pm
COS
- STL
1 stop11h 55m
Southwest
Deal found 4/23![Southwest logo]()
$356
This United Airlines deal was found by Cheapflights users on 4/20. 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 9/215:10 am
STL
- DEN
Nonstop2h 27m
United Airlines
Wed 9/235:34 pm
DEN
- STL
Nonstop2h 05m
United Airlines
Deal found 4/20![United Airlines logo]()
$324
This American Airlines deal was found by Cheapflights users on 4/20. 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.
Thu 5/217:03 am
STL
- EGE
1 stop7h 28m
American Airlines
Wed 5/277:50 am
EGE
- STL
1 stop7h 43m
American Airlines
Deal found 4/20![American Airlines logo]()
$387
This Southwest deal was found by Cheapflights users on 4/21. 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.
Thu 5/78:25 am
STL
- DEN
Nonstop2h 20m
Southwest
Fri 5/88:40 pm
DEN
- STL
Nonstop2h 10m
Southwest
Deal found 4/21![Southwest logo]()
$357
This United Airlines deal was found by Cheapflights users on 4/20. 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 5/124:06 pm
STL
- GJT
1 stop7h 12m
United Airlines
Thu 5/216:09 pm
GJT
- STL
1 stop4h 48m
United Airlines
Deal found 4/20![United Airlines logo]()
$325
This Southwest deal was found by Cheapflights users on 4/21. 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.
Fri 5/85:15 pm
STL
- DEN
Nonstop2h 20m
Southwest
Fri 5/88:40 pm
DEN
- STL
Nonstop2h 10m
Southwest
Deal found 4/21![Southwest logo]()
$357
This United Airlines deal was found by Cheapflights users on 4/19. 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.
Mon 5/42:35 pm
STL
- MTJ
1 stop6h 43m
United Airlines
Fri 5/81:43 pm
MTJ
- STL
1 stop6h 00m
United Airlines
Deal found 4/19![United Airlines logo]()
$326
This American Airlines deal was found by Cheapflights users on 4/22. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/297:12 am
STL
- GJT
1 stop6h 00m
American Airlines
Tue 5/54:58 pm
GJT
- STL
1 stop5h 01m
American Airlines
Deal found 4/22![American Airlines logo]()
$399
Last-minute flights from St. Louis to ColoradoDiscover last-minute flight deals from St. Louis to Colorado. Data last updated April 23, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Colorado. Data last updated April 23, 2026 and is based on user searches.
This Cheapflightsfares deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” 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 5/17:01 pm
STL
- DEN
1 stop5h 43m
Frontier
Sat 5/94:15 pm
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 4/18![Frontier logo]()
$145
This Cheapflightsfares deal was found by Cheapflights users on 4/19. 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.
Sat 5/28:17 pm
STL
- DEN
Nonstop2h 33m
Frontier
Sat 5/94:15 pm
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 4/19![Frontier logo]()
$107
This Frontier deal was found by Cheapflights users on 4/21. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/28:17 pm
STL
- DEN
Nonstop2h 33m
Frontier
Thu 5/75:05 am
DEN
- STL
1 stop8h 43m
Frontier
Deal found 4/21![Frontier logo]()
$154
This Kiwi.com deal was found by Cheapflights users on 4/22. 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 5/28:17 pm
STL
- DEN
Nonstop2h 33m
Frontier
Tue 5/510:33 am
DEN
- STL
1 stop6h 33m
Frontier
Deal found 4/22![Frontier logo]()
$173
This United Airlines deal was found by Cheapflights users on 4/20. 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 5/62:35 pm
STL
- HDN
1 stop6h 42m
United Airlines
Tue 5/261:20 pm
HDN
- STL
1 stop6h 50m
United Airlines
Deal found 4/20![United Airlines logo]()
$258
This American Airlines deal was found by Cheapflights users on 4/22. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/75:20 am
STL
- DRO
1 stop7h 51m
American Airlines
Mon 5/115:04 pm
DRO
- STL
1 stop4h 55m
American Airlines
Deal found 4/22![American Airlines logo]()
$288
This United Airlines deal was found by Cheapflights users on 4/23. 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.
Mon 5/115:59 pm
STL
- COS
1 stop4h 58m
United Airlines
Tue 5/121:25 pm
COS
- STL
1 stop6h 18m
United Airlines
Deal found 4/23![United Airlines logo]()
$296
This American Airlines deal was found by Cheapflights users on 4/21. 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 5/126:11 pm
STL
- COS
1 stop5h 14m
American Airlines
Tue 5/195:13 pm
COS
- STL
1 stop4h 46m
American Airlines
Deal found 4/21![American Airlines logo]()
$239
This United Airlines deal was found by Cheapflights users on 4/21. 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.
Tue 5/126:30 am
STL
- COS
1 stop5h 17m
United Airlines
Tue 5/191:25 pm
COS
- STL
2 stops6h 48m
United Airlines
Deal found 4/21![United Airlines logo]()
$280
This United Airlines deal was found by Cheapflights users on 4/21. 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.
Thu 5/148:46 am
STL
- COS
1 stop6h 37m
United Airlines
Tue 5/193:25 pm
COS
- STL
1 stop4h 18m
United Airlines
Deal found 4/21![United Airlines logo]()
$297
This United Airlines deal was found by Cheapflights users on 4/20. 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 5/264:48 pm
STL
- MTJ
1 stop4h 22m
United Airlines
Thu 5/2812:31 pm
MTJ
- STL
1 stop7h 50m
United Airlines
Deal found 4/20![United Airlines logo]()
$292
This United Airlines deal was found by Cheapflights users on 4/20. 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.
Fri 5/296:00 am
STL
- MTJ
1 stop6h 43m
United Airlines
Sun 5/313:25 pm
MTJ
- STL
1 stop7h 32m
United Airlines
Deal found 4/20![United Airlines logo]()
$285
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 April 23, 2026.
Search for one-way flight options from St. Louis to Colorado. Find affordable one-way fares based on user searches. Data last updated April 23, 2026.
This Super.com deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/68:08 pm
STL
- DEN
Nonstop2h 33m
Frontier
Deal found 4/18![Frontier logo]()
$35
This Super.com deal was found by Cheapflights users on 4/20. 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.
Wed 5/278:08 pm
STL
- DEN
Nonstop2h 33m
Frontier
Deal found 4/20![Frontier logo]()
$63
This Super.com deal was found by Cheapflights users on 4/23. 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.
Tue 5/268:08 pm
STL
- DEN
Nonstop2h 33m
Frontier
Deal found 4/23![Frontier logo]()
$64
This eDestinos deal was found by Cheapflights users on 4/21. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/159:18 pm
STL
- DEN
1 stop7h 07m
Frontier
Deal found 4/21![Frontier logo]()
$65
This Super.com deal was found by Cheapflights users on 4/20. 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.
Thu 6/48:08 pm
STL
- DEN
Nonstop2h 33m
Frontier
Deal found 4/20![Frontier logo]()
$66
This Frontier deal was found by Cheapflights users on 4/20. 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.
Sat 5/236:30 pm
STL
- DEN
1 stop6h 39m
Frontier
Deal found 4/20![Frontier logo]()
$70
This Super.com deal was found by Cheapflights users on 4/20. 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 6/58:08 pm
STL
- DEN
Nonstop2h 33m
Frontier
Deal found 4/20![Frontier logo]()
$73
This deal was found by Cheapflights users on 4/19. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/148:08 pm
STL
- DEN
Nonstop2h 33m
Frontier
Deal found 4/19![Frontier logo]()
$74
This United Airlines deal was found by Cheapflights users on 4/23. 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.
Thu 5/286:00 am
STL
- COS
1 stop6h 10m
United Airlines
Deal found 4/23![United Airlines logo]()
$131
This United Airlines deal was found by Cheapflights users on 4/23. 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 5/275:10 am
STL
- COS
1 stop6h 36m
United Airlines
Deal found 4/23![United Airlines logo]()
$150
This Delta deal was found by Cheapflights users on 4/19. 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.
Tue 6/303:45 pm
STL
- COS
1 stop7h 09m
Delta
Deal found 4/19![Delta logo]()
$167
This United Airlines deal was found by Cheapflights users on 4/23. 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.
Sat 5/306:00 am
STL
- COS
1 stop6h 10m
United Airlines
Deal found 4/23![United Airlines logo]()
$171
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 April 23, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $97 (Kiwi.com) |
One-way from | $35 (Super.com) |
Popular in | June |
Cheapest in | October |
Average price | $254 |
Good round-trip deal | $273 or less |
Good one-way deal | $183 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 April 23, 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. LouisHayden
STL - HDN
STLHDN
Lambert-St Louis
Wed 5/6
8:46 am-12:33 pm
1 stop4h 47m
Hayden Yampa Valley
Sat 5/23
3:20 pm-11:57 pm
1 stop7h 37m
$285
St. LouisColorado Springs
STL - COS
STLCOS
Lambert-St Louis
Tue 8/18
2:45 pm-9:45 pm
2 stops8h 00m
Colorado Springs
Thu 8/20
11:20 am-8:10 pm
2 stops7h 50m
$287
St. LouisDurango
STL - DRO
STLDRO
Lambert-St Louis
Thu 5/7
5:20 am-12:11 pm
1 stop7h 51m
Durango La Plata County
Mon 5/11
5:04 pm-10:59 pm
1 stop4h 55m
$288
St. LouisHayden
STL - HDN
STLHDN
Lambert-St Louis
Wed 5/6
2:35 pm-8:17 pm
1 stop6h 42m
Hayden Yampa Valley
Sat 5/9
1:40 pm-11:19 pm
2 stops8h 39m
$290
St. LouisGunnison
STL - GUC
STLGUC
Lambert-St Louis
Mon 8/17
6:42 am-12:10 pm
1 stop6h 28m
Gunnison
Sat 8/22
12:56 pm-8:26 pm
1 stop6h 30m
$290
St. LouisHayden
STL - HDN
STLHDN
Lambert-St Louis
Tue 5/5
8:46 am-12:33 pm
1 stop4h 47m
Hayden Yampa Valley
Sat 5/9
1:40 pm-8:43 pm
1 stop6h 03m
$299
St. LouisMontrose
STL - MTJ
STLMTJ
Lambert-St Louis
Wed 5/6
2:35 pm-8:18 pm
1 stop6h 43m
Montrose County
Sat 5/9
1:43 pm-8:43 pm
1 stop6h 00m
$299
St. LouisGrand Junction
STL - GJT
STLGJT
Lambert-St Louis
Wed 6/24
4:48 pm-8:34 pm
1 stop4h 46m
Grand Junction Regnl
Mon 6/29
6:10 pm-11:57 pm
1 stop4h 47m
$299
St. LouisHayden
STL - HDN
STLHDN
Lambert-St Louis
Tue 5/19
8:46 am-12:33 pm
1 stop4h 47m
Hayden Yampa Valley
Tue 5/26
3:20 pm-11:57 pm
1 stop7h 37m
$301
St. LouisColorado Springs
STL - COS
STLCOS
Lambert-St Louis
Sat 8/29
3:50 pm-10:29 pm
2 stops7h 39m
Colorado Springs
Sun 8/30
6:00 am-2:38 pm
1 stop7h 38m
$302
Showing 1-10 of 58 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-GJT
STL-DRO
STL-HDN
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-GJT
STL-DRO
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 55 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 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 $105). 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 April 23, 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 at noon tend to be the most expensive. A flight in the evening could potentially save you up to 55% on airfare.
What is the cheapest day to fly from St. Louis to Colorado?
Use this chart to determine the cheapest time to fly round-trip from St. Louis to Colorado. Price data was last updated on April 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. Tuesday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Weekly flight availability from St. Louis to Colorado
Explore weekly flight availability from St. Louis to Colorado. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated April 23, 2026.
The most flights from STL to USCO are scheduled on a Thursday (15 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (2 on average).
How much does it cost to fly round-trip from St. Louis to Colorado?
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 April 23, 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
Crew
8.6
Food
7.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Crew
8.6
Food
7.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Crew
8.6
Food
7.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Crew
8.6
Food
7.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Crew
8.6
Food
7.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Crew
8.6
Food
7.0
Entertainment
7.5
Overall
8.0
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.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Popular flights
Top destinations
Alternative routes for St. Louis to Colorado
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Colorado by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from St. Louis to Colorado by cabin class
Find flights from St. Louis to Colorado, based on your preferred cabin class, be it economy, premium economy, business, or first class.
St. Louis and Colorado flights
Browse other St. Louis and Colorado flight options. Last updated on April 23, 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 April 23, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$56 | Average$134 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$128 | Average$333 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$161 | Average$396 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$170 | Average$328 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$201 | Average$388 | FlexibilityNo cancel fee | On-time71% |