$63+ 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 3/23. Fares are subject to change and may not be available on all flights or dates of travel.
STL — DEN
Apr 9 — Apr 161
Round-trip
1 adult, Economy
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Find cheap flights from St. Louis to Colorado with Cheapflights
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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
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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 March 10, 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 March 10, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 3/7. 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.
Sat 4/188:17 pm
STL
- DEN
Nonstop2h 33m
Frontier
Mon 4/204:20 pm
DEN
- STL
Nonstop2h 12m
Frontier
Deal found 3/7![Frontier logo]()
$79
This Kiwi.com deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/28:17 pm
STL
- DEN
Nonstop2h 33m
Frontier
Mon 5/44:20 pm
DEN
- STL
Nonstop2h 12m
Frontier
Deal found 3/9![Frontier logo]()
$80
This Cheapflightsfares deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/18:16 pm
STL
- DEN
Nonstop2h 33m
Frontier
Wed 4/86:40 am
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 3/10![Frontier logo]()
$81
This Cheapflightsfares deal was found by Cheapflights users on 3/10. 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 4/138:19 pm
STL
- DEN
Nonstop2h 33m
Frontier
Thu 4/164:09 pm
DEN
- STL
Nonstop2h 12m
Frontier
Deal found 3/10![Frontier logo]()
$86
This Kiwi.com deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/248:06 pm
STL
- DEN
Nonstop2h 33m
Frontier
Mon 4/274:20 pm
DEN
- STL
Nonstop2h 12m
Frontier
Deal found 3/6![Frontier logo]()
$87
This Cheapflightsfares deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/88:12 pm
STL
- DEN
Nonstop2h 33m
Frontier
Sun 5/104:00 pm
DEN
- STL
Nonstop2h 12m
Frontier
Deal found 3/6![Frontier logo]()
$88
This Frontier deal was found by Cheapflights users on 3/7. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/238:12 pm
STL
- DEN
Nonstop2h 37m
Frontier
Sat 3/286:35 am
DEN
- STL
Nonstop2h 14m
Frontier
Deal found 3/7![Frontier logo]()
$89
This Cheapflightsfares deal was found by Cheapflights users on 3/10. 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.
Sat 4/48:16 pm
STL
- DEN
Nonstop2h 33m
Frontier
Wed 4/86:40 am
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 3/10![Frontier logo]()
$90
This Super.com deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/308:12 pm
STL
- DEN
Nonstop2h 37m
Frontier
Wed 4/16:40 am
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 3/8![Frontier logo]()
$91
This Frontier deal was found by Cheapflights users on 3/9. 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.
Mon 3/308:12 pm
STL
- DEN
Nonstop2h 37m
Frontier
Wed 4/86:40 am
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 3/9![Frontier logo]()
$92
This Booking.com deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/48:16 pm
STL
- DEN
Nonstop2h 33m
Frontier
Sat 4/116:40 am
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 3/5![Frontier logo]()
$98
This Southwest deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/65:15 am
STL
- COS
1 stop6h 15m
Southwest
Mon 4/134:05 pm
COS
- STL
1 stop7h 10m
Southwest
Deal found 3/9![Southwest logo]()
$221
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 March 10, 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 March 10, 2026.
This Southwest deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/149:40 pm
STL
- DEN
Nonstop2h 20m
Southwest
Sun 5/176:20 am
DEN
- STL
Nonstop2h 05m
Southwest
Deal found 3/5![Southwest logo]()
$217
This Delta deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/154:41 pm
STL
- DEN
1 stop6h 25m
Delta
Sun 4/196:27 pm
DEN
- STL
1 stop4h 58m
Delta
Deal found 3/6![Delta logo]()
$229
This United Airlines deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/135:59 pm
STL
- DEN
Nonstop2h 33m
United Airlines
Tue 5/195:34 pm
DEN
- STL
Nonstop2h 09m
United Airlines
Deal found 3/5![United Airlines logo]()
$247
This American Airlines deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/207:00 am
STL
- ASE
1 stop8h 17m
American Airlines
Tue 3/243:46 pm
ASE
- STL
1 stop6h 58m
American Airlines
Deal found 3/5![American Airlines logo]()
$289
This Southwest deal was found by Cheapflights users on 3/9. 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.
Tue 5/121:25 pm
STL
- DEN
1 stop4h 55m
Southwest
Fri 5/156:20 am
DEN
- STL
Nonstop2h 05m
Southwest
Deal found 3/9![Southwest logo]()
$219
This Southwest deal was found by Cheapflights users on 3/8. 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.
Mon 3/307:30 pm
STL
- DEN
1 stop6h 10m
Southwest
Wed 4/12:35 pm
DEN
- STL
2 stops5h 50m
Southwest
Deal found 3/8![Southwest logo]()
$226
This Delta deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/126:00 am
STL
- COS
1 stop7h 48m
Delta
Sat 5/161:55 pm
COS
- STL
1 stop6h 34m
Delta
Deal found 3/8![Delta logo]()
$250
This United Airlines deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/284:48 pm
STL
- GUC
1 stop4h 43m
United Airlines
Mon 6/11:25 pm
GUC
- STL
1 stop6h 18m
United Airlines
Deal found 3/5![United Airlines logo]()
$258
This United Airlines deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/274:48 pm
STL
- GUC
1 stop4h 43m
United Airlines
Mon 6/11:25 pm
GUC
- STL
1 stop6h 18m
United Airlines
Deal found 3/8![United Airlines logo]()
$265
This Delta deal was found by Cheapflights users on 3/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/2512:04 pm
STL
- GJT
2 stops10h 49m
Delta
Sun 3/295:15 pm
GJT
- STL
1 stop6h 06m
Delta
Deal found 3/10![Delta logo]()
$284
This Southwest deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/105:45 am
STL
- COS
1 stop5h 15m
Southwest
Mon 4/134:05 pm
COS
- STL
1 stop7h 10m
Southwest
Deal found 3/7![Southwest logo]()
$267
This United Airlines deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/145:59 pm
STL
- DEN
Nonstop2h 34m
United Airlines
Tue 5/195:34 pm
DEN
- STL
Nonstop2h 09m
United Airlines
Deal found 3/5![United Airlines logo]()
$267
This American Airlines deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/245:20 am
STL
- GJT
1 stop7h 52m
American Airlines
Mon 4/274:58 pm
GJT
- STL
1 stop5h 01m
American Airlines
Deal found 3/5![American Airlines logo]()
$341
This United Airlines deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/78:54 am
STL
- DRO
1 stop4h 40m
United Airlines
Tue 4/141:36 pm
DRO
- STL
1 stop6h 18m
United Airlines
Deal found 3/9![United Airlines logo]()
$268
This Southwest deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/15:15 pm
STL
- COS
1 stop6h 00m
Southwest
Tue 5/59:10 am
COS
- STL
2 stops7h 45m
Southwest
Deal found 3/5![Southwest logo]()
$270
This Delta deal was found by Cheapflights users on 3/8. 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.
Fri 8/213:42 pm
STL
- COS
1 stop6h 33m
Delta
Mon 8/245:55 pm
COS
- STL
1 stop5h 41m
Delta
Deal found 3/8![Delta logo]()
$313
This American Airlines deal was found by Cheapflights users on 3/9. 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.
Fri 3/275:12 am
STL
- GJT
1 stop5h 53m
American Airlines
Tue 3/317:00 am
GJT
- STL
2 stops9h 13m
American Airlines
Deal found 3/9![American Airlines logo]()
$354
This United Airlines deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/285:15 am
STL
- COS
1 stop4h 34m
United Airlines
Sat 4/41:33 pm
COS
- STL
1 stop6h 21m
United Airlines
Deal found 3/7![United Airlines logo]()
$270
This Delta deal was found by Cheapflights users on 3/9. 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.
Tue 4/77:03 am
STL
- ASE
1 stop8h 10m
Delta
Sat 4/181:33 pm
ASE
- STL
1 stop9h 03m
Delta
Deal found 3/9![Delta logo]()
$334
This United Airlines deal was found by Cheapflights users on 3/10. 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 3/259:00 am
STL
- MTJ
1 stop4h 32m
United Airlines
Sun 3/291:40 pm
MTJ
- STL
1 stop6h 14m
United Airlines
Deal found 3/10![United Airlines logo]()
$279
This Southwest deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/295:10 am
STL
- DEN
1 stop5h 35m
Southwest
Wed 4/12:35 pm
DEN
- STL
2 stops5h 50m
Southwest
Deal found 3/8![Southwest logo]()
$319
This Delta deal was found by Cheapflights users on 3/9. 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.
Wed 4/87:03 am
STL
- ASE
1 stop8h 10m
Delta
Sat 4/181:33 pm
ASE
- STL
1 stop9h 03m
Delta
Deal found 3/9![Delta logo]()
$334
This United Airlines deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/105:10 am
STL
- ASE
1 stop6h 41m
United Airlines
Mon 7/136:12 pm
ASE
- STL
1 stop4h 45m
United Airlines
Deal found 3/8![United Airlines logo]()
$289
This Delta deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/206:00 am
STL
- GJT
2 stops11h 46m
Delta
Fri 4/245:25 pm
GJT
- STL
1 stop6h 00m
Delta
Deal found 3/7![Delta logo]()
$346
This United Airlines deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/215:15 am
STL
- EGE
1 stop5h 17m
United Airlines
Wed 3/251:35 pm
EGE
- STL
2 stops8h 24m
United Airlines
Deal found 3/5![United Airlines logo]()
$294
This Southwest deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/58:25 am
STL
- MTJ
1 stop4h 10m
Southwest
Tue 4/78:45 am
MTJ
- STL
2 stops8h 10m
Southwest
Deal found 3/10![Southwest logo]()
$365
This United Airlines deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/202:50 pm
STL
- ASE
1 stop4h 50m
United Airlines
Tue 3/242:27 pm
ASE
- STL
2 stops7h 32m
United Airlines
Deal found 3/5![United Airlines logo]()
$294
This United Airlines deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/137:09 pm
STL
- DEN
1 stop5h 41m
United Airlines
Sun 5/175:34 pm
DEN
- STL
Nonstop2h 09m
United Airlines
Deal found 3/5![United Airlines logo]()
$297
This Southwest deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/265:45 am
STL
- HDN
1 stop8h 05m
Southwest
Sun 3/2912:10 pm
HDN
- STL
2 stops5h 45m
Southwest
Deal found 3/7![Southwest logo]()
$414
This United Airlines deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/36:30 am
STL
- MTJ
1 stop6h 20m
United Airlines
Sun 4/127:15 am
MTJ
- STL
1 stop4h 53m
United Airlines
Deal found 3/9![United Airlines logo]()
$301
Last-minute flights from St. Louis to ColoradoDiscover last-minute flight deals from St. Louis to Colorado. Data last updated March 10, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Colorado. Data last updated March 10, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 3/7. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/238:12 pm
STL
- DEN
Nonstop2h 37m
Frontier
Sat 3/286:35 am
DEN
- STL
Nonstop2h 14m
Frontier
Deal found 3/7![Frontier logo]()
$89
This Super.com deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/308:12 pm
STL
- DEN
Nonstop2h 37m
Frontier
Wed 4/16:40 am
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 3/8![Frontier logo]()
$91
This Frontier deal was found by Cheapflights users on 3/9. 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.
Mon 3/308:12 pm
STL
- DEN
Nonstop2h 37m
Frontier
Wed 4/86:40 am
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 3/9![Frontier logo]()
$92
This Cheapflightsfares deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/18:16 pm
STL
- DEN
Nonstop2h 33m
Frontier
Wed 4/86:40 am
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 3/10![Frontier logo]()
$81
This Cheapflightsfares deal was found by Cheapflights users on 3/10. 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.
Sat 4/48:16 pm
STL
- DEN
Nonstop2h 33m
Frontier
Wed 4/86:40 am
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 3/10![Frontier logo]()
$90
This Booking.com deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/48:16 pm
STL
- DEN
Nonstop2h 33m
Frontier
Sat 4/116:40 am
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 3/5![Frontier logo]()
$98
This Southwest deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/65:15 am
STL
- COS
1 stop6h 15m
Southwest
Mon 4/134:05 pm
COS
- STL
1 stop7h 10m
Southwest
Deal found 3/9![Southwest logo]()
$221
This Delta deal was found by Cheapflights users on 3/9. 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.
Wed 4/812:28 pm
STL
- COS
2 stops10h 37m
Delta
Wed 4/1511:55 am
COS
- STL
2 stops10h 19m
Delta
Deal found 3/9![Delta logo]()
$231
This Cheapflightsfares deal was found by Cheapflights users on 3/10. 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 4/138:19 pm
STL
- DEN
Nonstop2h 33m
Frontier
Thu 4/164:09 pm
DEN
- STL
Nonstop2h 12m
Frontier
Deal found 3/10![Frontier logo]()
$86
This Kiwi.com deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/178:06 pm
STL
- DEN
Nonstop2h 33m
Frontier
Mon 4/204:20 pm
DEN
- STL
Nonstop2h 12m
Frontier
Deal found 3/9![Frontier logo]()
$99
This Cheapflightsfares deal was found by Cheapflights users on 3/7. 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.
Sat 4/188:17 pm
STL
- DEN
Nonstop2h 33m
Frontier
Mon 4/204:20 pm
DEN
- STL
Nonstop2h 12m
Frontier
Deal found 3/7![Frontier logo]()
$79
This Kiwi.com deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/248:06 pm
STL
- DEN
Nonstop2h 33m
Frontier
Mon 4/274:20 pm
DEN
- STL
Nonstop2h 12m
Frontier
Deal found 3/6![Frontier logo]()
$87
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 March 10, 2026.
Search for one-way flight options from St. Louis to Colorado. Find affordable one-way fares based on user searches. Data last updated March 10, 2026.
This Super.com deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/238:12 pm
STL
- DEN
Nonstop2h 37m
Frontier
Deal found 3/9![Frontier logo]()
$63
This Trip.com deal was found by Cheapflights users on 3/10. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/168:12 pm
STL
- DEN
Nonstop2h 37m
Frontier
Deal found 3/10![Frontier logo]()
$67
This Super.com deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/278:12 pm
STL
- DEN
Nonstop2h 37m
Frontier
Deal found 3/9![Frontier logo]()
$68
This Cheapflightsfares deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/138:12 pm
STL
- DEN
Nonstop2h 37m
Frontier
Deal found 3/6![Frontier logo]()
$69
This Kiwi.com deal was found by Cheapflights users on 3/10. 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.
Fri 5/158:12 pm
STL
- DEN
Nonstop2h 33m
Frontier
Deal found 3/10![Frontier logo]()
$73
This Cheapflightsfares deal was found by Cheapflights users on 3/9. 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.
Fri 4/108:16 pm
STL
- DEN
Nonstop2h 33m
Frontier
Deal found 3/9![Frontier logo]()
$74
This Kiwi.com deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/208:23 pm
STL
- DEN
1 stop16h 51m
Frontier
Deal found 3/6![Frontier logo]()
$77
This Kiwi.com deal was found by Cheapflights users on 3/10. 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.
Sat 5/238:08 pm
STL
- DEN
Nonstop2h 40m
Frontier
Deal found 3/10![Frontier logo]()
$78
This Cheapflightsfares deal was found by Cheapflights users on 3/10. 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.
Sat 5/168:12 pm
STL
- DEN
Nonstop2h 33m
Frontier
Deal found 3/10![Frontier logo]()
$79
This Cheapflightsfares deal was found by Cheapflights users on 3/10. 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.
Sat 5/24:16 pm
STL
- DEN
1 stop9h 03m
Frontier
Deal found 3/10![Frontier logo]()
$80
This American Airlines deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/227:12 am
STL
- COS
1 stop6h 37m
American Airlines
Deal found 3/5![American Airlines logo]()
$99
This Southwest deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/222:30 pm
STL
- COS
2 stops6h 45m
Southwest
Deal found 3/5![Southwest logo]()
$114
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 March 10, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $79 (Cheapflightsfares) |
One-way from | $63 (Super.com) |
Popular in | June |
Cheapest in | October |
Average price | $270 |
Good round-trip deal | $248 or less |
Good one-way deal | $130 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 March 10, 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
Thu 5/14
9:40 pm-11:00 pm
Nonstop2h 20m
Denver Intl
Sun 5/17
6:20 am-9:25 am
Nonstop2h 05m
$217
St. LouisDenver
STL - DEN
STLDEN
Lambert-St Louis
Tue 5/12
1:25 pm-5:20 pm
1 stop4h 55m
Denver Intl
Fri 5/15
6:20 am-9:25 am
Nonstop2h 05m
$219
St. LouisDenver
STL - DEN
STLDEN
Lambert-St Louis
Mon 3/30
7:30 pm-12:40 am
1 stop6h 10m
Denver Intl
Wed 4/1
2:35 pm-9:25 pm
2 stops5h 50m
$226
St. LouisDenver
STL - DEN
STLDEN
Lambert-St Louis
Wed 4/15
4:41 pm-10:06 pm
1 stop6h 25m
Denver Intl
Sun 4/19
6:27 pm-12:25 am
1 stop4h 58m
$229
St. LouisDenver
STL - DEN
STLDEN
Lambert-St Louis
Wed 5/13
5:59 pm-7:32 pm
Nonstop2h 33m
Denver Intl
Tue 5/19
5:34 pm-8:43 pm
Nonstop2h 09m
$247
St. LouisColorado Springs
STL - COS
STLCOS
Lambert-St Louis
Tue 5/12
6:00 am-12:48 pm
1 stop7h 48m
Colorado Springs
Sat 5/16
1:55 pm-9:29 pm
1 stop6h 34m
$250
St. LouisGunnison
STL - GUC
STLGUC
Lambert-St Louis
Thu 5/28
4:48 pm-8:31 pm
1 stop4h 43m
Gunnison
Mon 6/1
1:25 pm-8:43 pm
1 stop6h 18m
$258
St. LouisGunnison
STL - GUC
STLGUC
Lambert-St Louis
Wed 5/27
4:48 pm-8:31 pm
1 stop4h 43m
Gunnison
Mon 6/1
1:25 pm-8:43 pm
1 stop6h 18m
$265
St. LouisColorado Springs
STL - COS
STLCOS
Lambert-St Louis
Fri 4/10
5:45 am-10:00 am
1 stop5h 15m
Colorado Springs
Mon 4/13
4:05 pm-12:15 am
1 stop7h 10m
$267
St. LouisDenver
STL - DEN
STLDEN
Lambert-St Louis
Thu 5/14
5:59 pm-7:33 pm
Nonstop2h 34m
Denver Intl
Tue 5/19
5:34 pm-8:43 pm
Nonstop2h 09m
$267
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-ASE
STL-COS
STL-GUC
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-ASE
STL-COS
STL-GUC
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 $51). Flying from St. Louis to Colorado in June is currently the most expensive (average of $126). 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 March 10, 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 59% 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 February 21, 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 March 10, 2026.
The most flights from STL to USCO are scheduled on a Monday (15 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (6 on average).
How much does it cost to fly round-trip from 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 March 10, 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.
Overall
8.0
Crew
8.6
Comfort
8.0
Boarding
8.1
Food
7.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Crew
8.6
Comfort
8.0
Boarding
8.1
Food
7.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Crew
8.6
Comfort
8.0
Boarding
8.1
Food
7.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Crew
8.6
Comfort
8.0
Boarding
8.1
Food
7.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Crew
8.6
Comfort
8.0
Boarding
8.1
Food
7.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Crew
8.6
Comfort
8.0
Boarding
8.1
Food
7.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Related info for your journey
Find useful and relevant information for your journey from St. Louis to Colorado. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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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 March 10, 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 March 10, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$56 | Average$132 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$108 | Average$308 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$157 | Average$399 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$175 | Average$333 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$201 | Average$374 | FlexibilityNo cancel fee | On-time71% |