$96+ Cheap flights from Illinois to Colorado
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/16. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — DEN
Nov 29 — Dec 61
Round-trip
1 adult, Economy
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Find cheap flights from Illinois to Colorado with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Illinois to Colorado
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Cheapest flights from Illinois to ColoradoExplore the most affordable flight options available from Illinois to Colorado. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 30, 2026.
Explore the most affordable flight options available from Illinois to Colorado. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 30, 2026.
This Kiwi.com deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 12/43:55 pm -
1 stop7h 30m
Tue 12/89:26 pm -
Nonstop2h 28m
Deal found 10/29![Frontier logo]()
$157
This Cheapflightsfares deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” 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.
Sun 12/67:25 am -
Nonstop3h 04m
Sat 1/168:59 pm -
Nonstop2h 27m
Deal found 10/30![Frontier logo]()
$158
This Super.com deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 11/206:40 am -
Nonstop2h 56m
Tue 11/249:26 pm -
Nonstop2h 27m
Deal found 10/29![Frontier logo]()
$159
This Cheapflightsfares deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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 11/206:40 am -
Nonstop2h 56m
Fri 11/279:26 pm -
Nonstop2h 27m
Deal found 10/28![Frontier logo]()
$160
This Cheapflightsfares deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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 11/2312:05 pm -
1 stop13h 02m
Wed 11/259:26 pm -
Nonstop2h 27m
Deal found 10/28![Frontier logo]()
$161
This Kiwi.com deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 12/237:45 am -
Nonstop3h 04m
Mon 12/288:59 pm -
Nonstop2h 27m
Deal found 10/29![Frontier logo]()
$162
This CheapOair deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/247:00 am -
Nonstop3h 04m
Tue 12/298:59 pm -
Nonstop2h 27m
Deal found 10/30![Frontier logo]()
$163
This Kiwi.com deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 12/247:00 am -
Nonstop3h 04m
Mon 1/48:59 pm -
Nonstop2h 27m
Deal found 10/29![Frontier logo]()
$164
This Kiwi.com deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” 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 12/410:41 am -
1 stop6h 07m
Tue 12/88:40 pm -
1 stop12h 05m
Deal found 10/27![Frontier logo]()
$164
This Cheapflightsfares deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 11/206:40 am -
Nonstop2h 56m
Tue 12/18:25 am -
1 stop19h 34m
Deal found 10/29![Frontier logo]()
$165
This Mytrip deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1012:27 pm -
1 stop10h 07m
Wed 11/119:20 pm -
1 stop13h 05m
Deal found 10/25![Frontier logo]()
$165
This Cheapflightsfares deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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.
Sun 11/86:30 am -
Nonstop2h 56m
Wed 11/118:55 pm -
Nonstop2h 26m
Deal found 10/28![Frontier logo]()
$166
Best flights from Illinois to ColoradoDiscover carefully curated flight deals from Illinois to Colorado that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 30, 2026.
Discover carefully curated flight deals from Illinois to Colorado that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 30, 2026.
This Southwest deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 12/88:05 am -
Nonstop2h 55m
Tue 12/154:15 pm -
Nonstop2h 20m
Deal found 10/29![Southwest logo]()
$199
This United Airlines deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” 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 1/238:20 pm -
Nonstop2h 59m
Sat 2/67:40 am -
Nonstop2h 44m
Deal found 10/27![United Airlines logo]()
$243
This Delta deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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 12/75:30 am -
1 stop8h 03m
Thu 12/101:40 pm -
1 stop6h 13m
Deal found 10/28![Delta logo]()
$273
This Southwest deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” 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 12/210:50 am -
Nonstop2h 40m
Mon 12/72:25 pm -
1 stop4h 15m
Deal found 10/27![Southwest logo]()
$206
This Alaska Airlines deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/187:00 am -
2 stops13h 19m
Mon 11/237:24 am -
1 stop11h 39m
Deal found 10/28![Alaska Airlines logo]()
$417
This Southwest deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” 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 12/106:05 am -
Nonstop2h 55m
Tue 12/1511:05 am -
1 stop5h 00m
Deal found 10/26![Southwest logo]()
$206
This Delta deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 11/205:42 pm -
1 stop6h 52m
Fri 11/272:13 pm -
1 stop4h 26m
Deal found 10/29![Delta logo]()
$282
This Southwest deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 11/234:25 pm -
1 stop4h 25m
Fri 11/278:30 am -
1 stop5h 25m
Deal found 10/29![Southwest logo]()
$241
This United Airlines deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” 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 11/179:47 pm -
Nonstop2h 44m
Thu 11/197:45 am -
Nonstop2h 34m
Deal found 10/26![United Airlines logo]()
$296
This American Airlines deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” 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.
Sun 11/159:30 am -
2 stops10h 31m
Sun 11/228:00 am -
1 stop6h 59m
Deal found 10/25![American Airlines logo]()
$604
This Southwest deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” 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 11/219:35 pm -
Nonstop2h 50m
Sun 12/68:40 pm -
Nonstop2h 15m
Deal found 10/26![Southwest logo]()
$242
This United Airlines deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 12/37:52 pm -
Nonstop3h 07m
Sun 12/65:45 am -
Nonstop2h 51m
Deal found 10/29![United Airlines logo]()
$301
This Southwest deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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 12/199:35 pm -
Nonstop2h 50m
Wed 12/238:55 pm -
Nonstop2h 20m
Deal found 10/28![Southwest logo]()
$243
This Delta deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 11/2611:18 am -
1 stop5h 09m
Mon 11/3011:08 am -
1 stop4h 33m
Deal found 10/29![Delta logo]()
$328
This United Airlines deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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 11/257:57 pm -
1 stop5h 02m
Thu 12/35:45 am -
Nonstop2h 51m
Deal found 10/28![United Airlines logo]()
$322
This Southwest deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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 12/2210:50 pm -
Nonstop2h 50m
Thu 12/246:05 pm -
Nonstop2h 25m
Deal found 10/28![Southwest logo]()
$243
This Delta deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” 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 1/225:30 am -
1 stop8h 04m
Fri 1/298:06 am -
2 stops11h 26m
Deal found 10/26![Delta logo]()
$334
This Alaska Airlines deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/167:00 am -
2 stops17h 59m
Sat 11/218:00 pm -
1 stop26h 49m
Deal found 10/26![Alaska Airlines logo]()
$418
This Southwest deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” 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 12/115:40 pm -
Nonstop2h 45m
Mon 12/147:05 am -
Nonstop2h 25m
Deal found 10/25![Southwest logo]()
$243
This United Airlines deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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 12/45:30 pm -
1 stop5h 29m
Mon 12/75:25 pm -
Nonstop2h 21m
Deal found 10/28![United Airlines logo]()
$349
This Delta deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 2/235:55 am -
1 stop9h 21m
Mon 3/13:35 pm -
1 stop5h 55m
Deal found 10/29![Delta logo]()
$359
This Southwest deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 1/1510:05 am -
1 stop4h 25m
Sat 1/236:30 am -
Nonstop2h 25m
Deal found 10/29![Southwest logo]()
$249
This Alaska Airlines deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/127:20 am -
2 stops15h 06m
Tue 11/178:20 am -
1 stop27h 57m
Deal found 10/26![Alaska Airlines logo]()
$468
This United Airlines deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” 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 11/118:41 am -
Nonstop2h 54m
Tue 11/175:45 pm -
Nonstop2h 21m
Deal found 10/25![United Airlines logo]()
$359
This Delta deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 1/87:10 am -
1 stop6h 24m
Mon 2/11:29 pm -
1 stop6h 01m
Deal found 10/29![Delta logo]()
$360
This Southwest deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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 12/53:15 pm -
1 stop4h 35m
Sun 12/68:40 pm -
Nonstop2h 15m
Deal found 10/28![Southwest logo]()
$251
This Alaska Airlines deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/247:26 am -
1 stop27h 50m
Tue 12/17:40 am -
2 stops15h 19m
Deal found 10/26![Alaska Airlines logo]()
$474
This United Airlines deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/19:13 am -
Nonstop3h 17m
Thu 2/2512:45 pm -
Nonstop2h 56m
Deal found 10/29![United Airlines logo]()
$359
This Alaska Airlines deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/153:19 pm -
2 stops23h 48m
Mon 1/181:45 pm -
1 stop22h 30m
Deal found 10/28![Alaska Airlines logo]()
$474
This Delta deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” 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 11/185:30 am -
2 stops12h 58m
Wed 11/258:14 am -
1 stop8h 51m
Deal found 10/25![Delta logo]()
$399
Last-minute flights from Illinois to ColoradoDiscover last-minute flight deals from Illinois to Colorado. Data last updated October 30, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Colorado. Data last updated October 30, 2026 and is based on user searches.
This Cheapflightsfares deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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 11/49:51 am -
1 stop23h 22m
Wed 11/118:55 pm -
Nonstop2h 26m
Deal found 10/28![Frontier logo]()
$167
This Cheapflightsfares deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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.
Sun 11/86:30 am -
Nonstop2h 56m
Wed 11/118:55 pm -
Nonstop2h 26m
Deal found 10/28![Frontier logo]()
$166
This Frontier deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/86:30 am -
Nonstop2h 56m
Wed 11/188:55 pm -
Nonstop2h 26m
Deal found 10/28![Frontier logo]()
$168
This Mytrip deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1012:27 pm -
1 stop10h 07m
Wed 11/119:20 pm -
1 stop13h 05m
Deal found 10/25![Frontier logo]()
$165
This Frontier deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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 11/104:36 pm -
1 stop5h 58m
Tue 11/178:55 pm -
Nonstop2h 26m
Deal found 10/28![Frontier logo]()
$169
This Frontier deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” 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 11/146:30 am -
Nonstop2h 56m
Thu 11/198:55 pm -
Nonstop2h 26m
Deal found 10/25![Frontier logo]()
$164
This Super.com deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 11/206:40 am -
Nonstop2h 56m
Tue 11/249:26 pm -
Nonstop2h 27m
Deal found 10/29![Frontier logo]()
$159
This Cheapflightsfares deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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 11/206:40 am -
Nonstop2h 56m
Fri 11/279:26 pm -
Nonstop2h 27m
Deal found 10/28![Frontier logo]()
$160
This Cheapflightsfares deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 11/206:40 am -
Nonstop2h 56m
Tue 12/18:25 am -
1 stop19h 34m
Deal found 10/29![Frontier logo]()
$165
This Gotogate deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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 11/215:25 am -
1 stop20h 17m
Mon 11/239:26 pm -
Nonstop2h 27m
Deal found 10/28![Frontier logo]()
$162
This Cheapflightsfares deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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 11/2312:05 pm -
1 stop13h 02m
Wed 11/259:26 pm -
Nonstop2h 27m
Deal found 10/28![Frontier logo]()
$161
This Cheapflightsfares deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” 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 11/248:42 pm -
1 stop14h 31m
Tue 12/18:46 pm -
1 stop11h 40m
Deal found 10/27![Frontier logo]()
$167
One-way flights from Illinois to ColoradoSearch for one-way flight options from Illinois to Colorado. Find affordable one-way fares based on user searches. Data last updated October 30, 2026.
Search for one-way flight options from Illinois to Colorado. Find affordable one-way fares based on user searches. Data last updated October 30, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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 1/166:01 am -
1 stop6h 58m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/28![Frontier logo]()
$96
This Super.com deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/188:59 am -
1 stop7h 54m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/29![Frontier logo]()
$97
This Frontier deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 12/710:40 am -
1 stop12h 15m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/29![Frontier logo]()
$97
This Super.com deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” 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 12/195:40 am -
1 stop10h 16m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/27![Frontier logo]()
$98
This Super.com deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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 12/226:52 am -
1 stop7h 56m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/28![Frontier logo]()
$98
This Kiwi.com deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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 11/255:15 am -
1 stop7h 41m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/28![Frontier logo]()
$99
This Super.com deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 11/208:28 am -
1 stop8h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/29![Frontier logo]()
$99
This Super.com deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/245:58 am -
1 stop8h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/28![Frontier logo]()
$100
This Southwest deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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 12/56:25 pm -
Nonstop2h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/28![Southwest logo]()
$100
This United Airlines deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” 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 11/255:48 pm -
Nonstop2h 57m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/27![United Airlines logo]()
$101
This Southwest deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” 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 11/2510:50 pm -
Nonstop2h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/29![Southwest logo]()
$101
This Frontier deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” 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 12/114:08 pm -
1 stop7h 23m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/28![Frontier logo]()
$102
Find flight deals from Illinois to Colorado
Keep the following information in mind while searching for Illinois to Colorado flight deals. Data was last updated October 30, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $157 (Kiwi.com) |
One-way from | $96 (Cheapflightsfares) |
Popular in | July |
Cheapest in | January |
Average price | $286 |
Good round-trip deal | $260 or less |
Good one-way deal | $169 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Illinois 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 7,457,451 searches. Data last updated October 30, 2026.
Use the filters below to find and compare flights from Illinois to Colorado that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
ChicagoDenver
MDW Chicago Midway - DEN Denver Intl
MDWDEN
Chicago Midway
Sat 12/5
6:25 pm-8:15 pm
Nonstop2h 50m
Denver Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$100
ChicagoDenver
MDW Chicago Midway - DEN Denver Intl
MDWDEN
Chicago Midway
Tue 11/24
10:50 pm-12:40 am
Nonstop2h 50m
Denver Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$101
ChicagoDenver
MDW Chicago Midway - DEN Denver Intl
MDWDEN
Chicago Midway
Mon 12/14
8:55 pm-10:40 pm
Nonstop2h 45m
Denver Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$101
ChicagoDenver
ORD Chicago O'Hare Intl - DEN Denver Intl
ORDDEN
Chicago O'Hare Intl
Tue 12/1
5:33 pm-11:49 pm
1 stop7h 16m
Denver Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$110
ChicagoDenver
MDW Chicago Midway - DEN Denver Intl
MDWDEN
Chicago Midway
Tue 12/1
5:30 pm-11:49 pm
1 stop7h 19m
Denver Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$110
Quickest round-trip
ChicagoDenver
MDW Chicago Midway - DEN Denver Intl
MDWDEN
Chicago Midway
Thu 11/26
12:45 pm-2:25 pm
Nonstop2h 40m
Denver Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$122
ChicagoDenver
MDW Chicago Midway - DEN Denver Intl
MDWDEN
Chicago Midway
Sat 11/21
4:50 pm-6:35 pm
Nonstop2h 45m
Denver Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$122
ChicagoDenver
MDW Chicago Midway - DEN Denver Intl
MDWDEN
Chicago Midway
Mon 1/4
5:40 pm-7:25 pm
Nonstop2h 45m
Denver Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$122
ChicagoDenver
MDW Chicago Midway - DEN Denver Intl
MDWDEN
Chicago Midway
Sat 1/16
4:10 pm-5:50 pm
Nonstop2h 40m
Denver Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$122
ChicagoDenver
MDW Chicago Midway - DEN Denver Intl
MDWDEN
Chicago Midway
Thu 12/31
8:55 pm-10:40 pm
Nonstop2h 45m
Denver Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$122
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Illinois to Colorado
Have a flexible travel schedule? Discover the best time to fly to Colorado from Illinois with our price prediction graph.
MDW-DEN
ORD-DEN
ORD-COS
MLI-DEN
ORD-HDN
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Illinois to Colorado
USIL-USCO
MDW-DEN
ORD-DEN
ORD-COS
MLI-DEN
What is the cheapest month to book a flight from Illinois to Colorado?
Currently, January is the cheapest month in which you can book a flight from Illinois to Colorado (average of $253). Flying from Illinois to Colorado in June is currently the most expensive (average of $345). 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 IL to CO?
Find hourly flight availability from Illinois 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 October 30, 2026.
It’s optimal to fly from Illinois to Colorado in the afternoon. By choosing this option you can save up to 15% on the cost of your flight, compared to a flight in the evening.
How much does it cost to fly round-trip from Illinois to Colorado?
Airfare is below average for this route at the moment.
Illinois to Colorado flights typically cost between $186 and $372 in December.The cheapest round-trip price found within the last 5 days was $157 on Frontier (Dec 4-Dec 8).
How far ahead should I book a flight from Illinois to Colorado?
Booking 84 days in advance of your planned departure date is, on average, the best time to get cheap flights from Illinois to Colorado. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
What is the cheapest day to fly from Illinois to Colorado?
Use this chart to determine the cheapest time to fly round-trip from Illinois to Colorado. Price data was last updated on October 24, 2026.
Travelers seeking maximum savings on their Illinois to Colorado flight should consider departing on Monday at noon when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Reviews of airlines servicing Colorado
Get insights into the airlines that provide service to Colorado. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Colorado. Reviews last updated October 30, 2026.
Read reviews from past customers who have flown Southwest,United Airlines, andAllegiant Air from Illinois to Colorado. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Food
7.0
Overall
7.9
Comfort
8.0
Crew
8.6
Entertainment
7.4
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Food
7.0
Overall
7.9
Comfort
8.0
Crew
8.6
Entertainment
7.4
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Food
7.0
Overall
7.9
Comfort
8.0
Crew
8.6
Entertainment
7.4
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Food
7.0
Overall
7.9
Comfort
8.0
Crew
8.6
Entertainment
7.4
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Food
7.0
Overall
7.9
Comfort
8.0
Crew
8.6
Entertainment
7.4
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Food
7.0
Overall
7.9
Comfort
8.0
Crew
8.6
Entertainment
7.4
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Related info for your journey
Find useful and relevant information for your journey from Illinois 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 Illinois to Colorado
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Colorado by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Illinois to Colorado by cabin class
Find flights from Illinois to Colorado, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Illinois and Colorado flights
Browse other Illinois and Colorado flight options. Last updated on October 30, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Find a return flight route from Colorado
Find the right flight back to Illinois after your stay in Colorado
Illinois to Colorado flights
Consider these flights traveling from Illinois to Colorado.
Top 7 airlines flying from Illinois to Colorado
Discover the top 7 airlines that operate flights from Illinois 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 7,457,451 searches. Data last updated October 30, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$71 | Average$192 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$98 | Average$280 | FlexibilityNo cancel fee | On-time88% | |
| Cheapest$105 | Average$348 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$145 | Average$223 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$176 | Average$414 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$178 | Average$447 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$187 | Average$362 | FlexibilityNo cancel fee | On-time63% |