$102+ 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 6/27. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — STL
Jul 9 — Jul 161
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
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
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 Colorado to St. Louis
Cheapest
Best
Last-minute
One-way
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 June 9, 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 June 9, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/294:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Wed 8/58:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/8![Frontier logo]()
$163
This Cheapflightsfares deal was found by Cheapflights users on 6/6. 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.
Sat 6/273:41 pm
DEN
- STL
Nonstop2h 12m
Frontier
Tue 6/308:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/6![Frontier logo]()
$166
This Kiwi.com deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/264:12 pm
DEN
- STL
Nonstop2h 11m
Frontier
Sun 8/306:33 pm
STL
- DEN
1 stop15h 25m
Frontier
Deal found 6/4![Frontier logo]()
$167
This Cheapflightsfares deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/74:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Tue 7/148:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/7![Frontier logo]()
$168
This Frontier deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/84:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Wed 7/158:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/7![Frontier logo]()
$170
This Kiwi.com deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/254:12 pm
DEN
- STL
Nonstop2h 11m
Frontier
Sun 8/306:33 pm
STL
- DEN
1 stop20h 26m
Frontier
Deal found 6/4![Frontier logo]()
$172
This Kiwi.com deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/104:12 pm
DEN
- STL
Nonstop2h 03m
Frontier
Mon 9/148:10 pm
STL
- DEN
Nonstop2h 39m
Frontier
Deal found 6/8![Frontier logo]()
$175
This Kiwi.com deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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 7/304:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Mon 8/34:57 pm
STL
- DEN
1 stop30h 08m
Frontier
Deal found 6/4![Frontier logo]()
$176
This Cheapflightsfares deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/133:41 pm
DEN
- STL
Nonstop2h 12m
Frontier
Tue 6/308:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/8![Frontier logo]()
$177
This Kiwi.com deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/117:00 am
DEN
- STL
2 stops24h 57m
Frontier
Tue 8/188:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/8![Frontier logo]()
$179
This Southwest deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/1610:45 am
COS
- STL
1 stop8h 10m
Southwest
Wed 9/307:05 am
STL
- COS
1 stop6h 35m
Southwest
Deal found 6/8![Southwest logo]()
$240
This Delta deal was found by Cheapflights users on 6/5. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/296:30 am
COS
- STL
1 stop7h 03m
Delta
Sat 9/56:20 am
STL
- COS
1 stop5h 27m
Delta
Deal found 6/5![Delta logo]()
$252
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 June 9, 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 June 9, 2026.
This Southwest deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/18:45 pm
DEN
- STL
Nonstop2h 10m
Southwest
Tue 7/79:15 pm
STL
- DEN
Nonstop2h 25m
Southwest
Deal found 6/8![Southwest logo]()
$217
This Delta deal was found by Cheapflights users on 6/5. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/14:43 pm
DEN
- STL
1 stop6h 13m
Delta
Wed 7/85:36 pm
STL
- DEN
1 stop6h 51m
Delta
Deal found 6/5![Delta logo]()
$247
This United Airlines deal was found by Cheapflights users on 6/5. 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.
Tue 7/75:34 pm
DEN
- STL
Nonstop2h 09m
United Airlines
Sat 7/119:06 am
STL
- DEN
Nonstop2h 24m
United Airlines
Deal found 6/5![United Airlines logo]()
$292
This American Airlines deal was found by Cheapflights users on 6/6. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/277:00 am
ASE
- STL
1 stop8h 23m
American Airlines
Mon 8/318:36 am
STL
- ASE
1 stop6h 14m
American Airlines
Deal found 6/6![American Airlines logo]()
$329
This Kiwi.com deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/2812:53 pm
GJT
- STL
2 stops29h 30m
Multiple Airlines
Sat 8/17:10 pm
STL
- GJT
1 stop18h 33m
Multiple Airlines
Deal found 6/9![Multiple Airlines logo]()
$364
This Southwest deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/286:15 am
DEN
- STL
Nonstop2h 05m
Southwest
Tue 8/48:50 pm
STL
- DEN
Nonstop2h 15m
Southwest
Deal found 6/8![Southwest logo]()
$219
This Southwest deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/161:15 pm
COS
- STL
1 stop7h 25m
Southwest
Wed 9/302:45 pm
STL
- COS
2 stops8h 00m
Southwest
Deal found 6/8![Southwest logo]()
$246
This United Airlines deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/247:05 am
HDN
- STL
1 stop4h 35m
United Airlines
Tue 10/279:13 am
STL
- HDN
1 stop4h 22m
United Airlines
Deal found 6/8![United Airlines logo]()
$293
This United Airlines deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/2510:27 am
COS
- STL
1 stop5h 07m
United Airlines
Wed 8/265:10 am
STL
- COS
1 stop6h 34m
United Airlines
Deal found 6/4![United Airlines logo]()
$317
This Delta deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/216:05 am
DEN
- STL
1 stop6h 00m
Delta
Tue 7/216:58 pm
STL
- DEN
1 stop6h 25m
Delta
Deal found 6/7![Delta logo]()
$367
This American Airlines deal was found by Cheapflights users on 6/5. 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.
Thu 6/255:06 pm
DRO
- STL
1 stop5h 53m
American Airlines
Sun 6/285:29 am
STL
- DRO
1 stop5h 25m
American Airlines
Deal found 6/5![American Airlines logo]()
$368
This Southwest deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/85:10 pm
COS
- STL
1 stop5h 45m
Southwest
Sun 7/126:00 am
STL
- COS
1 stop5h 25m
Southwest
Deal found 6/4![Southwest logo]()
$312
This United Airlines deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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 7/166:12 pm
ASE
- STL
1 stop4h 45m
United Airlines
Sun 7/195:10 am
STL
- ASE
1 stop4h 37m
United Airlines
Deal found 6/4![United Airlines logo]()
$329
This Delta deal was found by Cheapflights users on 6/5. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/186:14 pm
COS
- STL
1 stop5h 20m
Delta
Sun 9/2012:00 pm
STL
- COS
1 stop8h 36m
Delta
Deal found 6/5![Delta logo]()
$397
This United Airlines deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/156:12 pm
ASE
- STL
1 stop4h 45m
United Airlines
Sat 7/185:10 am
STL
- ASE
1 stop4h 36m
United Airlines
Deal found 6/4![United Airlines logo]()
$329
This Southwest deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/201:15 pm
COS
- STL
1 stop4h 50m
Southwest
Thu 8/2711:55 am
STL
- COS
2 stops10h 50m
Southwest
Deal found 6/4![Southwest logo]()
$330
This American Airlines deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/108:00 am
EGE
- STL
2 stops12h 25m
American Airlines
Mon 9/147:00 am
STL
- EGE
1 stop6h 17m
American Airlines
Deal found 6/9![American Airlines logo]()
$416
This United Airlines deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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 7/162:22 pm
ASE
- STL
1 stop5h 21m
United Airlines
Mon 7/205:10 am
STL
- ASE
1 stop4h 36m
United Airlines
Deal found 6/4![United Airlines logo]()
$329
This Southwest deal was found by Cheapflights users on 6/6. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/1611:40 am
DEN
- STL
Nonstop2h 10m
Southwest
Thu 7/1610:35 pm
STL
- DEN
Nonstop2h 20m
Southwest
Deal found 6/6![Southwest logo]()
$367
This American Airlines deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/247:50 am
EGE
- STL
1 stop7h 38m
American Airlines
Tue 7/285:32 am
STL
- EGE
1 stop5h 21m
American Airlines
Deal found 6/9![American Airlines logo]()
$454
This United Airlines deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/198:45 pm
DEN
- STL
Nonstop2h 12m
United Airlines
Tue 7/214:48 pm
STL
- DEN
Nonstop2h 35m
United Airlines
Deal found 6/7![United Airlines logo]()
$357
This Southwest deal was found by Cheapflights users on 6/6. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/34:40 pm
COS
- STL
1 stop6h 55m
Southwest
Mon 7/65:35 am
STL
- COS
1 stop4h 20m
Southwest
Deal found 6/6![Southwest logo]()
$378
This United Airlines deal was found by Cheapflights users on 6/5. 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 8/201:42 pm
MTJ
- STL
1 stop6h 04m
United Airlines
Mon 8/244:40 pm
STL
- MTJ
1 stop4h 45m
United Airlines
Deal found 6/5![United Airlines logo]()
$361
This Southwest deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/511:15 am
DEN
- STL
2 stops5h 40m
Southwest
Sat 8/84:20 pm
STL
- DEN
1 stop5h 55m
Southwest
Deal found 6/7![Southwest logo]()
$382
This United Airlines deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/233:20 pm
HDN
- STL
1 stop4h 50m
United Airlines
Sat 6/274:45 pm
STL
- HDN
1 stop4h 22m
United Airlines
Deal found 6/8![United Airlines logo]()
$369
This Southwest deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/242:35 pm
COS
- STL
1 stop6h 00m
Southwest
Mon 7/277:20 pm
STL
- COS
1 stop7h 05m
Southwest
Deal found 6/8![Southwest logo]()
$387
This United Airlines deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/256:07 pm
GJT
- STL
1 stop4h 33m
United Airlines
Sat 8/291:36 pm
STL
- GJT
1 stop4h 50m
United Airlines
Deal found 6/4![United Airlines logo]()
$379
This Southwest deal was found by Cheapflights users on 6/5. 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 7/37:40 am
DEN
- STL
2 stops5h 30m
Southwest
Sun 7/56:00 am
STL
- DEN
1 stop4h 20m
Southwest
Deal found 6/5![Southwest logo]()
$388
This Southwest deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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 7/319:35 am
COS
- STL
1 stop6h 25m
Southwest
Mon 8/38:10 am
STL
- COS
2 stops8h 50m
Southwest
Deal found 6/4![Southwest logo]()
$392
This United Airlines deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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 11/117:30 am
HDN
- STL
2 stops14h 55m
United Airlines
Sat 11/149:13 am
STL
- HDN
1 stop4h 22m
United Airlines
Deal found 6/4![United Airlines logo]()
$398
Last-minute flights from Colorado to St. LouisDiscover last-minute flight deals from Colorado to St. Louis. Data last updated June 9, 2026 and is based on user searches.
Discover last-minute flight deals from Colorado to St. Louis. Data last updated June 9, 2026 and is based on user searches.
This Cheapflightsfares deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/133:41 pm
DEN
- STL
Nonstop2h 12m
Frontier
Tue 6/308:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/8![Frontier logo]()
$177
This Cheapflightsfares deal was found by Cheapflights users on 6/6. 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.
Sat 6/273:41 pm
DEN
- STL
Nonstop2h 12m
Frontier
Tue 6/308:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/6![Frontier logo]()
$166
This Super.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/293:41 pm
DEN
- STL
Nonstop2h 12m
Frontier
Wed 7/18:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/7![Frontier logo]()
$191
This Cheapflightsfares deal was found by Cheapflights users on 6/6. 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.
Wed 7/14:12 pm
DEN
- STL
Nonstop2h 11m
Frontier
Tue 7/78:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/6![Frontier logo]()
$181
This American Airlines deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/17:50 am
EGE
- STL
1 stop7h 43m
American Airlines
Tue 7/75:32 am
STL
- EGE
1 stop5h 21m
American Airlines
Deal found 6/4![American Airlines logo]()
$276
This Frontier deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/43:41 pm
DEN
- STL
Nonstop2h 12m
Frontier
Wed 7/158:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/7![Frontier logo]()
$188
This Cheapflightsfares deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/74:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Tue 7/148:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/7![Frontier logo]()
$168
This Kiwi.com deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/712:53 pm
GJT
- STL
1 stop28h 12m
Multiple Airlines
Mon 7/137:10 pm
STL
- GJT
1 stop18h 03m
Multiple Airlines
Deal found 6/8![Multiple Airlines logo]()
$278
This Frontier deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/84:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Wed 7/158:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/7![Frontier logo]()
$170
This Cheapflightsfares deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/84:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Sat 7/118:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/4![Frontier logo]()
$186
This Cheapflightsfares deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/294:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Wed 8/58:08 pm
STL
- DEN
Nonstop2h 36m
Frontier
Deal found 6/8![Frontier logo]()
$163
This Kiwi.com deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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 7/304:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Mon 8/34:57 pm
STL
- DEN
1 stop30h 08m
Frontier
Deal found 6/4![Frontier logo]()
$176
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 June 9, 2026.
Search for one-way flight options from Colorado to St. Louis. Find affordable one-way fares based on user searches. Data last updated June 9, 2026.
This Super.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/273:41 pm
DEN
- STL
Nonstop2h 12m
Frontier
Deal found 6/7![Frontier logo]()
$102
This Cheapflightsfares deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/74:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Deal found 6/8![Frontier logo]()
$104
This Frontier deal was found by Cheapflights users on 6/6. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/304:12 pm
DEN
- STL
Nonstop2h 11m
Frontier
Deal found 6/6![Frontier logo]()
$106
This Southwest deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/16:15 am
DEN
- STL
Nonstop2h 05m
Southwest
Deal found 6/4![Southwest logo]()
$109
This Kiwi.com deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/2911:46 pm
DEN
- STL
1 stop16h 51m
Frontier
Deal found 6/8![Frontier logo]()
$118
This Southwest deal was found by Cheapflights users on 6/5. 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 7/86:10 pm
COS
- STL
1 stop4h 35m
Southwest
Deal found 6/5![Southwest logo]()
$119
This Delta deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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 6/303:55 pm
DEN
- STL
1 stop7h 48m
Delta
Deal found 6/4![Delta logo]()
$119
This Southwest deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/48:40 am
DEN
- STL
1 stop3h 15m
Southwest
Deal found 6/8![Southwest logo]()
$120
This Kiwi.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/25:05 am
DEN
- STL
1 stop8h 43m
Frontier
Deal found 6/7![Frontier logo]()
$122
This Frontier deal was found by Cheapflights users on 6/6. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/43:41 pm
DEN
- STL
Nonstop2h 12m
Frontier
Deal found 6/6![Frontier logo]()
$124
This Frontier deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/74:10 pm
DEN
- STL
Nonstop2h 13m
Frontier
Deal found 6/8![Frontier logo]()
$125
This Delta deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/81:40 pm
COS
- STL
1 stop7h 35m
Delta
Deal found 6/9![Delta logo]()
$150
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 June 9, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $163 (Cheapflightsfares) |
One-way from | $102 (Super.com) |
Popular in | March |
Cheapest in | January |
Average price | $292 |
Good round-trip deal | $255 or less |
Good one-way deal | $149 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 June 9, 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
Wed 7/1
8:45 pm-11:55 pm
Nonstop2h 10m
Lambert-St Louis
Tue 7/7
9:15 pm-10:40 pm
Nonstop2h 25m
$217
Quickest round-trip
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
Tue 7/28
6:15 am-9:20 am
Nonstop2h 05m
Lambert-St Louis
Tue 8/4
8:50 pm-10:05 pm
Nonstop2h 15m
$219
Colorado SpringsSt. Louis
COS - STL
COSSTL
Colorado Springs
Wed 9/16
1:15 pm-9:40 pm
1 stop7h 25m
Lambert-St Louis
Wed 9/30
2:45 pm-9:45 pm
2 stops8h 00m
$246
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
Wed 7/1
4:43 pm-11:56 pm
1 stop6h 13m
Lambert-St Louis
Wed 7/8
5:36 pm-11:27 pm
1 stop6h 51m
$247
DenverSt. Louis
DEN - STL
DENSTL
Denver Intl
Tue 7/7
5:34 pm-8:43 pm
Nonstop2h 09m
Lambert-St Louis
Sat 7/11
9:06 am-10:30 am
Nonstop2h 24m
$292
HaydenSt. Louis
HDN - STL
HDNSTL
Hayden Yampa Valley
Sat 10/24
7:05 am-12:40 pm
1 stop4h 35m
Lambert-St Louis
Tue 10/27
9:13 am-12:35 pm
1 stop4h 22m
$293
Colorado SpringsSt. Louis
COS - STL
COSSTL
Colorado Springs
Wed 7/8
5:10 pm-11:55 pm
1 stop5h 45m
Lambert-St Louis
Sun 7/12
6:00 am-10:25 am
1 stop5h 25m
$312
Colorado SpringsSt. Louis
COS - STL
COSSTL
Colorado Springs
Tue 8/25
10:27 am-4:34 pm
1 stop5h 07m
Lambert-St Louis
Wed 8/26
5:10 am-10:44 am
1 stop6h 34m
$317
AspenSt. Louis
ASE - STL
ASESTL
Aspen Pitkin County
Thu 8/27
7:00 am-4:23 pm
1 stop8h 23m
Lambert-St Louis
Mon 8/31
8:36 am-1:50 pm
1 stop6h 14m
$329
AspenSt. Louis
ASE - STL
ASESTL
Aspen Pitkin County
Thu 7/16
6:12 pm-11:57 pm
1 stop4h 45m
Lambert-St Louis
Sun 7/19
5:10 am-8:47 am
1 stop4h 37m
$329
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
ASE-STL
GJT-STL
COS-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
ASE-STL
GJT-STL
COS-STL
What is the cheapest month to book a flight from Colorado to St. Louis?
Currently, December is the cheapest month in which you can book a flight from Colorado to St. Louis (average of $33). Flying from Colorado to St. Louis in July is currently the most expensive (average of $79). 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 June 9, 2026.
It’s optimal to fly from Colorado to St. Louis in the afternoon. By choosing this option you can save up to 19% on the cost of your flight, compared to a flight at noon.
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 June 9, 2026.
The most flights from USCO to STL are scheduled on a Tuesday (17 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 Colorado to St. Louis?
How far ahead should I book a flight from Colorado to St. Louis?
The best time to book flights from Colorado to St. Louis is 50 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
What is the cheapest day to fly from 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 May 30, 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 at noon flights should be avoided if possible as fares are typically the most expensive at this time.
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 locationsO'Fallon
Edwardsville
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.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Popular flights
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 June 9, 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 June 9, 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 June 9, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$59 | Average$181 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$177 | Average$374 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$180 | Average$400 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$248 | Average$416 | FlexibilityNo cancel fee | On-time71% |