$43+ Cheap flights from Colorado to St. Louis (STL)
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 4/11. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — STL
Apr 22 — Apr 291
Round-trip
1 adult, Economy
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Find cheap flights from Colorado to St. Louis with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Cheapest flights from Colorado to St. LouisExplore the most affordable flight options available from Colorado to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 23, 2026.
Explore the most affordable flight options available from Colorado to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 23, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/18. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/16:40 am
DEN
- STL
Nonstop2h 08m
Frontier
Mon 4/68:19 pm
STL
- DEN
Nonstop2h 33m
Frontier
Deal found 3/18![Frontier logo]()
$107
This Kiwi.com deal was found by Cheapflights users on 3/19. 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 4/164:09 pm
DEN
- STL
Nonstop2h 12m
Frontier
Thu 4/238:06 pm
STL
- DEN
Nonstop2h 33m
Frontier
Deal found 3/19![Frontier logo]()
$111
This Cheapflightsfares deal was found by Cheapflights users on 3/22. 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.
Sat 5/24:20 pm
DEN
- STL
Nonstop2h 12m
Frontier
Wed 5/66:51 pm
STL
- DEN
1 stop9h 34m
Frontier
Deal found 3/22![Frontier logo]()
$113
This Gotogate deal was found by Cheapflights users on 3/20. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/184:20 pm
DEN
- STL
Nonstop2h 12m
Frontier
Mon 4/209:55 pm
STL
- DEN
1 stop7h 04m
Frontier
Deal found 3/20![Frontier logo]()
$114
This Booking.com deal was found by Cheapflights users on 3/20. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/511:54 pm
DEN
- STL
1 stop8h 01m
Frontier
Sat 5/98:08 pm
STL
- DEN
Nonstop2h 33m
Frontier
Deal found 3/20![Frontier logo]()
$115
This Frontier deal was found by Cheapflights users on 3/19. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/14:09 pm
DEN
- STL
Nonstop2h 12m
Frontier
Mon 5/48:17 pm
STL
- DEN
Nonstop2h 33m
Frontier
Deal found 3/19![Frontier logo]()
$120
This Super.com deal was found by Cheapflights users on 3/18. 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.
Fri 4/106:40 am
DEN
- STL
Nonstop2h 08m
Frontier
Mon 4/138:19 pm
STL
- DEN
Nonstop2h 33m
Frontier
Deal found 3/18![Frontier logo]()
$121
This Frontier deal was found by Cheapflights users on 3/20. 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.
Mon 5/44:20 pm
DEN
- STL
Nonstop2h 12m
Frontier
Wed 5/66:51 pm
STL
- DEN
1 stop9h 34m
Frontier
Deal found 3/20![Frontier logo]()
$126
This Cheapflightsfares deal was found by Cheapflights users on 3/22. 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.
Fri 5/14:09 pm
DEN
- STL
Nonstop2h 12m
Frontier
Sun 5/38:06 pm
STL
- DEN
Nonstop2h 33m
Frontier
Deal found 3/22![Frontier logo]()
$127
This Frontier deal was found by Cheapflights users on 3/22. 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.
Sat 4/254:20 pm
DEN
- STL
Nonstop2h 12m
Frontier
Mon 4/278:17 pm
STL
- DEN
Nonstop2h 33m
Frontier
Deal found 3/22![Frontier logo]()
$128
This Kiwi.com deal was found by Cheapflights users on 3/20. 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 5/74:15 pm
DEN
- STL
Nonstop2h 08m
Frontier
Sun 5/108:08 pm
STL
- DEN
Nonstop2h 33m
Frontier
Deal found 3/20![Frontier logo]()
$129
This Southwest deal was found by Cheapflights users on 3/18. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/154:45 pm
COS
- STL
1 stop5h 30m
Southwest
Wed 4/222:30 pm
STL
- COS
1 stop8h 50m
Southwest
Deal found 3/18![Southwest logo]()
$221
Best flights from Colorado to St. LouisDiscover carefully curated flight deals from Colorado to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 23, 2026.
Discover carefully curated flight deals from Colorado to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 23, 2026.
This Southwest deal was found by Cheapflights users on 3/19. 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 5/148:40 pm
DEN
- STL
Nonstop2h 10m
Southwest
Tue 5/196:35 am
STL
- DEN
Nonstop2h 20m
Southwest
Deal found 3/19![Southwest logo]()
$211
This United Airlines deal was found by Cheapflights users on 3/19. 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.
Sat 4/181:33 pm
COS
- STL
1 stop6h 21m
United Airlines
Sat 4/256:00 am
STL
- COS
1 stop6h 24m
United Airlines
Deal found 3/19![United Airlines logo]()
$241
This Delta deal was found by Cheapflights users on 3/22. 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.
Thu 4/235:25 pm
GJT
- STL
1 stop6h 00m
Delta
Tue 4/282:20 pm
STL
- GJT
1 stop5h 15m
Delta
Deal found 3/22![Delta logo]()
$339
This Southwest deal was found by Cheapflights users on 3/20. 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.
Tue 5/128:40 am
DEN
- STL
1 stop3h 20m
Southwest
Thu 5/149:40 pm
STL
- DEN
Nonstop2h 20m
Southwest
Deal found 3/20![Southwest logo]()
$217
This American Airlines deal was found by Cheapflights users on 3/19. 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.
Wed 6/2412:45 pm
GUC
- STL
1 stop7h 52m
American Airlines
Wed 7/15:25 am
STL
- GUC
1 stop7h 38m
American Airlines
Deal found 3/19![American Airlines logo]()
$459
This Southwest deal was found by Cheapflights users on 3/23. 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.
Wed 5/68:40 am
DEN
- STL
1 stop3h 20m
Southwest
Wed 5/64:35 pm
STL
- DEN
1 stop5h 05m
Southwest
Deal found 3/23![Southwest logo]()
$236
This United Airlines deal was found by Cheapflights users on 3/19. 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 6/31:20 pm
HDN
- STL
1 stop6h 23m
United Airlines
Fri 6/124:48 pm
STL
- HDN
1 stop4h 29m
United Airlines
Deal found 3/19![United Airlines logo]()
$277
This Southwest deal was found by Cheapflights users on 3/18. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/165:00 am
COS
- STL
1 stop6h 50m
Southwest
Mon 4/205:45 am
STL
- COS
1 stop5h 15m
Southwest
Deal found 3/18![Southwest logo]()
$241
This Southwest deal was found by Cheapflights users on 3/20. 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 4/164:05 pm
COS
- STL
1 stop5h 35m
Southwest
Sat 4/181:45 pm
STL
- COS
1 stop8h 05m
Southwest
Deal found 3/20![Southwest logo]()
$241
This United Airlines deal was found by Cheapflights users on 3/19. 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.
Sat 4/41:29 pm
GJT
- STL
1 stop6h 25m
United Airlines
Wed 4/86:05 pm
STL
- GJT
1 stop5h 12m
United Airlines
Deal found 3/19![United Airlines logo]()
$299
This Delta deal was found by Cheapflights users on 3/22. 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.
Fri 4/245:25 pm
GJT
- STL
1 stop6h 00m
Delta
Tue 4/282:20 pm
STL
- GJT
1 stop5h 15m
Delta
Deal found 3/22![Delta logo]()
$339
This Southwest deal was found by Cheapflights users on 3/19. 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.
Sat 4/182:15 pm
COS
- STL
1 stop7h 45m
Southwest
Sat 4/256:10 am
STL
- COS
2 stops8h 30m
Southwest
Deal found 3/19![Southwest logo]()
$246
This United Airlines deal was found by Cheapflights users on 3/22. 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.
Tue 6/29:28 am
GJT
- STL
1 stop6h 05m
United Airlines
Sat 6/65:10 am
STL
- GJT
1 stop4h 43m
United Airlines
Deal found 3/22![United Airlines logo]()
$299
This Delta deal was found by Cheapflights users on 3/21. 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.
Wed 7/12:15 pm
DEN
- STL
1 stop8h 41m
Delta
Mon 7/135:19 pm
STL
- DEN
1 stop8h 16m
Delta
Deal found 3/21![Delta logo]()
$367
This United Airlines deal was found by Cheapflights users on 3/19. 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.
Sun 5/1010:05 am
DEN
- STL
Nonstop2h 08m
United Airlines
Wed 5/135:59 pm
STL
- DEN
Nonstop2h 33m
United Airlines
Deal found 3/19![United Airlines logo]()
$309
This Southwest deal was found by Cheapflights users on 3/19. 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 4/246:20 am
DEN
- STL
Nonstop2h 05m
Southwest
Sun 4/266:15 am
STL
- DEN
Nonstop2h 20m
Southwest
Deal found 3/19![Southwest logo]()
$257
This Delta deal was found by Cheapflights users on 3/21. 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.
Fri 7/36:00 am
DEN
- STL
1 stop7h 40m
Delta
Tue 7/75:42 pm
STL
- DEN
1 stop6h 45m
Delta
Deal found 3/21![Delta logo]()
$367
This American Airlines deal was found by Cheapflights users on 3/19. 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.
Wed 6/105:06 pm
DRO
- STL
1 stop5h 53m
American Airlines
Wed 6/175:25 am
STL
- DRO
1 stop5h 29m
American Airlines
Deal found 3/19![American Airlines logo]()
$480
This United Airlines deal was found by Cheapflights users on 3/18. 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.
Fri 6/191:22 pm
ASE
- STL
1 stop6h 21m
United Airlines
Sun 6/215:10 am
STL
- ASE
1 stop4h 37m
United Airlines
Deal found 3/18![United Airlines logo]()
$329
This United Airlines deal was found by Cheapflights users on 3/18. 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.
Fri 6/193:25 pm
ASE
- STL
1 stop4h 18m
United Airlines
Mon 6/225:10 am
STL
- ASE
1 stop4h 36m
United Airlines
Deal found 3/18![United Airlines logo]()
$329
This Southwest deal was found by Cheapflights users on 3/20. 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.
Fri 4/248:40 pm
DEN
- STL
Nonstop2h 10m
Southwest
Tue 4/286:35 am
STL
- DEN
Nonstop2h 20m
Southwest
Deal found 3/20![Southwest logo]()
$302
This Delta deal was found by Cheapflights users on 3/21. 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 7/46:00 am
DEN
- STL
1 stop7h 30m
Delta
Wed 7/86:21 am
STL
- DEN
1 stop4h 42m
Delta
Deal found 3/21![Delta logo]()
$402
This United Airlines deal was found by Cheapflights users on 3/19. 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 4/81:40 pm
MTJ
- STL
1 stop6h 14m
United Airlines
Tue 4/149:10 am
STL
- MTJ
2 stops12h 10m
United Airlines
Deal found 3/19![United Airlines logo]()
$330
This Southwest deal was found by Cheapflights users on 3/19. 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 4/95:00 am
COS
- STL
1 stop6h 50m
Southwest
Sun 4/125:35 am
STL
- COS
1 stop6h 05m
Southwest
Deal found 3/19![Southwest logo]()
$330
This United Airlines deal was found by Cheapflights users on 3/19. 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.
Fri 6/53:20 pm
HDN
- STL
1 stop7h 37m
United Airlines
Sat 6/134:45 pm
STL
- HDN
1 stop4h 32m
United Airlines
Deal found 3/19![United Airlines logo]()
$341
This Southwest deal was found by Cheapflights users on 3/18. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/88:45 am
MTJ
- STL
1 stop4h 05m
Southwest
Tue 4/143:55 pm
STL
- MTJ
1 stop5h 00m
Southwest
Deal found 3/18![Southwest logo]()
$338
This United Airlines deal was found by Cheapflights users on 3/20. 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.
Sat 5/21:36 pm
GUC
- STL
1 stop6h 07m
United Airlines
Wed 5/62:35 pm
STL
- GUC
1 stop6h 59m
United Airlines
Deal found 3/20![United Airlines logo]()
$351
This United Airlines deal was found by Cheapflights users on 3/18. 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.
Sat 5/21:40 pm
HDN
- STL
1 stop6h 03m
United Airlines
Wed 5/68:46 am
STL
- HDN
1 stop4h 47m
United Airlines
Deal found 3/18![United Airlines logo]()
$351
This Southwest deal was found by Cheapflights users on 3/21. 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 4/245:20 pm
COS
- STL
1 stop5h 30m
Southwest
Sun 4/266:15 am
STL
- COS
1 stop4h 05m
Southwest
Deal found 3/21![Southwest logo]()
$360
This United Airlines deal was found by Cheapflights users on 3/22. 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.
Sat 5/21:43 pm
MTJ
- STL
1 stop6h 00m
United Airlines
Wed 5/62:35 pm
STL
- MTJ
1 stop6h 43m
United Airlines
Deal found 3/22![United Airlines logo]()
$351
Last-minute flights from Colorado to St. LouisDiscover last-minute flight deals from Colorado to St. Louis. Data last updated March 23, 2026 and is based on user searches.
Discover last-minute flight deals from Colorado to St. Louis. Data last updated March 23, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 3/18. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/16:40 am
DEN
- STL
Nonstop2h 08m
Frontier
Mon 4/68:19 pm
STL
- DEN
Nonstop2h 33m
Frontier
Deal found 3/18![Frontier logo]()
$107
This Super.com deal was found by Cheapflights users on 3/18. 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.
Fri 4/106:40 am
DEN
- STL
Nonstop2h 08m
Frontier
Mon 4/138:19 pm
STL
- DEN
Nonstop2h 33m
Frontier
Deal found 3/18![Frontier logo]()
$121
This Cheapflightsfares deal was found by Cheapflights users on 3/19. 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 4/1010:40 pm
DEN
- STL
1 stop12h 41m
Frontier
Sat 4/118:16 pm
STL
- DEN
Nonstop2h 33m
Frontier
Deal found 3/19![Frontier logo]()
$133
This Southwest deal was found by Cheapflights users on 3/18. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/154:45 pm
COS
- STL
1 stop5h 30m
Southwest
Wed 4/222:30 pm
STL
- COS
1 stop8h 50m
Southwest
Deal found 3/18![Southwest logo]()
$221
This Kiwi.com deal was found by Cheapflights users on 3/19. 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 4/164:09 pm
DEN
- STL
Nonstop2h 12m
Frontier
Thu 4/238:06 pm
STL
- DEN
Nonstop2h 33m
Frontier
Deal found 3/19![Frontier logo]()
$111
This Cheapflightsfares deal was found by Cheapflights users on 3/21. 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 4/169:00 pm
DEN
- STL
1 stop9h 54m
Frontier
Mon 4/208:17 pm
STL
- DEN
Nonstop2h 33m
Frontier
Deal found 3/21![Frontier logo]()
$143
This Southwest deal was found by Cheapflights users on 3/20. 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 4/164:05 pm
COS
- STL
1 stop5h 35m
Southwest
Sat 4/181:45 pm
STL
- COS
1 stop8h 05m
Southwest
Deal found 3/20![Southwest logo]()
$241
This Expedia deal was found by Cheapflights users on 3/18. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/174:09 pm
DEN
- STL
Nonstop2h 12m
Frontier
Fri 4/248:06 pm
STL
- DEN
Nonstop2h 33m
Frontier
Deal found 3/18![Frontier logo]()
$137
This Gotogate deal was found by Cheapflights users on 3/20. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/184:20 pm
DEN
- STL
Nonstop2h 12m
Frontier
Mon 4/209:55 pm
STL
- DEN
1 stop7h 04m
Frontier
Deal found 3/20![Frontier logo]()
$114
This Expedia deal was found by Cheapflights users on 3/19. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2011:59 pm
DEN
- STL
1 stop22h 20m
Frontier
Mon 4/278:17 pm
STL
- DEN
Nonstop2h 33m
Frontier
Deal found 3/19![Frontier logo]()
$134
This Frontier deal was found by Cheapflights users on 3/22. 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.
Sat 4/254:20 pm
DEN
- STL
Nonstop2h 12m
Frontier
Mon 4/278:17 pm
STL
- DEN
Nonstop2h 33m
Frontier
Deal found 3/22![Frontier logo]()
$128
This Kiwi.com deal was found by Cheapflights users on 3/22. 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.
Sun 4/264:09 pm
DEN
- STL
Nonstop2h 12m
Frontier
Mon 4/278:17 pm
STL
- DEN
Nonstop2h 33m
Frontier
Deal found 3/22![Frontier logo]()
$127
One-way flights from Colorado to St. LouisSearch for one-way flight options from Colorado to St. Louis. Find affordable one-way fares based on user searches. Data last updated March 23, 2026.
Search for one-way flight options from Colorado to St. Louis. Find affordable one-way fares based on user searches. Data last updated March 23, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/18. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/116:40 am
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 3/18![Frontier logo]()
$43
This Frontier deal was found by Cheapflights users on 3/19. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/174:09 pm
DEN
- STL
Nonstop2h 12m
Frontier
Deal found 3/19![Frontier logo]()
$44
This Cheapflightsfares deal was found by Cheapflights users on 3/20. 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.
Sat 4/184:20 pm
DEN
- STL
Nonstop2h 12m
Frontier
Deal found 3/20![Frontier logo]()
$54
This Kiwi.com deal was found by Cheapflights users on 3/19. 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 4/164:09 pm
DEN
- STL
Nonstop2h 12m
Frontier
Deal found 3/19![Frontier logo]()
$55
This Frontier deal was found by Cheapflights users on 3/20. 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.
Mon 5/184:15 pm
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 3/20![Frontier logo]()
$56
This Super.com deal was found by Cheapflights users on 3/18. 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.
Fri 5/14:09 pm
DEN
- STL
Nonstop2h 12m
Frontier
Deal found 3/18![Frontier logo]()
$63
This Frontier deal was found by Cheapflights users on 3/22. 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 4/234:09 pm
DEN
- STL
Nonstop2h 12m
Frontier
Deal found 3/22![Frontier logo]()
$64
This Super.com deal was found by Cheapflights users on 3/20. 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.
Tue 5/1911:54 pm
DEN
- STL
1 stop8h 01m
Frontier
Deal found 3/20![Frontier logo]()
$69
This Expedia deal was found by Cheapflights users on 3/22. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/1711:54 pm
DEN
- STL
1 stop8h 01m
Frontier
Deal found 3/22![Frontier logo]()
$70
This Kiwi.com deal was found by Cheapflights users on 3/22. 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.
Fri 5/84:15 pm
DEN
- STL
Nonstop2h 08m
Frontier
Deal found 3/22![Frontier logo]()
$73
This United Airlines deal was found by Cheapflights users on 3/19. 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.
Sat 4/183:26 pm
COS
- STL
1 stop4h 28m
United Airlines
Deal found 3/19![United Airlines logo]()
$121
This Delta deal was found by Cheapflights users on 3/19. 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.
Sat 4/187:59 am
COS
- STL
2 stops7h 51m
Delta
Deal found 3/19![Delta logo]()
$126
Find flight deals from Colorado to St. Louis
Keep the following information in mind while searching for Colorado to St. Louis flight deals. Data was last updated March 23, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $111 (Kiwi.com) |
One-way from | $43 (Kiwi.com) |
Popular in | June |
Cheapest in | January |
Average price | $299 |
Good round-trip deal | $216 or less |
Good one-way deal | $168 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Colorado to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 23, 2026.
Use the filters below to find and compare flights from Colorado to St. Louis that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
Thu 5/14
8:40 pm-11:50 pm
Nonstop2h 10m
Lambert-St Louis
Tue 5/19
6:35 am-7:55 am
Nonstop2h 20m
$211
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
Tue 5/12
8:40 am-1:00 pm
1 stop3h 20m
Lambert-St Louis
Thu 5/14
9:40 pm-11:00 pm
Nonstop2h 20m
$217
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
Wed 5/6
8:40 am-1:00 pm
1 stop3h 20m
Lambert-St Louis
Wed 5/6
4:35 pm-8:40 pm
1 stop5h 05m
$236
Colorado SpringsSt. Louis
COS - STL
COSSTL
Colorado Springs
Sat 4/18
1:33 pm-8:54 pm
1 stop6h 21m
Lambert-St Louis
Sat 4/25
6:00 am-11:24 am
1 stop6h 24m
$241
Colorado SpringsSt. Louis
COS - STL
COSSTL
Colorado Springs
Thu 4/16
5:00 am-12:50 pm
1 stop6h 50m
Lambert-St Louis
Mon 4/20
5:45 am-10:00 am
1 stop5h 15m
$241
Colorado SpringsSt. Louis
COS - STL
COSSTL
Colorado Springs
Thu 4/16
4:05 pm-10:40 pm
1 stop5h 35m
Lambert-St Louis
Sat 4/18
1:45 pm-8:50 pm
1 stop8h 05m
$241
Colorado SpringsSt. Louis
COS - STL
COSSTL
Colorado Springs
Sat 4/18
2:15 pm-11:00 pm
1 stop7h 45m
Lambert-St Louis
Sat 4/25
6:10 am-1:40 pm
2 stops8h 30m
$246
Quickest round-trip
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
Fri 4/24
6:20 am-9:25 am
Nonstop2h 05m
Lambert-St Louis
Sun 4/26
6:15 am-7:35 am
Nonstop2h 20m
$257
HaydenSt. Louis
HDN - STL
HDNSTL
Hayden Yampa Valley
Wed 6/3
1:20 pm-8:43 pm
1 stop6h 23m
Lambert-St Louis
Fri 6/12
4:48 pm-8:17 pm
1 stop4h 29m
$277
Grand JunctionSt. Louis
GJT - STL
GJTSTL
Grand Junction Regnl
Sat 4/4
1:29 pm-8:54 pm
1 stop6h 25m
Lambert-St Louis
Wed 4/8
6:05 pm-10:17 pm
1 stop5h 12m
$299
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Colorado to St. Louis
Have a flexible travel schedule? Discover the best time to fly to St. Louis from Colorado with our price prediction graph.
DEN-STL
COS-STL
GJT-STL
GUC-STL
HDN-STL
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Colorado to St. Louis
USCO-STL
DEN-STL
COS-STL
GJT-STL
GUC-STL
What is the cheapest month to book a flight from Colorado to St. Louis?
Currently, February is the cheapest month in which you can book a flight from Colorado to St. Louis (average of $55). Flying from Colorado to St. Louis in June is currently the most expensive (average of $135). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from CO to STL?
Find hourly flight availability from Colorado to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated March 23, 2026.
It’s optimal to fly from Colorado to St. Louis in the morning. By choosing this option you can save up to 11% on the cost of your flight, compared to a flight at noon.
What is the cheapest day to fly from Colorado to St. Louis?
Use this chart to determine the cheapest time to fly round-trip from Colorado to St. Louis. Price data was last updated on March 14, 2026.
Travelers seeking maximum savings on their Colorado to St. Louis flight should consider departing on Saturday afternoons when fares are most often at their lowest. Monday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
Weekly flight availability from Colorado to St. Louis
Explore weekly flight availability from Colorado to St. Louis. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated March 23, 2026.
The most flights from USCO to STL are scheduled on a Monday (19 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (6 on average).
Related info for your journey
Find useful and relevant information for your journey from Colorado to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near St. Louis?
Book flights to St. Louis if you plan to visit one of these locationsEdwardsville
O'Fallon
Fenton
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Wentzville
Glencoe
Chesterfield
Alton
Farmington
Festus
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.
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St. Louis flight routes
Top destinations
Alternative routes for Colorado to St. Louis
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to St. Louis by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Colorado to St. Louis by cabin class
Find flights from Colorado to St. Louis, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Colorado and St. Louis flights
Browse other Colorado and St. Louis flight options. Last updated on March 23, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to St. Louis
Explore flights to St. Louis departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on March 23, 2026.
Colorado to St. Louis flights
Consider these flights traveling from Colorado to St. Louis.
Top 4 airlines flying from Colorado to St. Louis
Discover the top 4 airlines that operate flights from Colorado to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 23, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$59 | Average$168 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$169 | Average$394 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$177 | Average$355 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$248 | Average$427 | FlexibilityNo cancel fee | On-time71% |