$107+ Cheap flights from Illinois to Denver (DEN)
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 11/18. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — DEN
Nov 24 — Dec 11
Round-trip
1 adult, Economy
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Find cheap flights from Illinois to Denver with Cheapflights
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Cheapest flights from Illinois to DenverExplore the most affordable flight options available from Illinois to Denver. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 25, 2026.
Explore the most affordable flight options available from Illinois to Denver. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 25, 2026.
This Travelocity deal was found by Cheapflights users on 10/21. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/510:40 am -
1 stop12h 15m
Tue 12/88:40 pm -
1 stop12h 05m
Deal found 10/21![Frontier logo]()
$164
This Frontier deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/165:15 pm -
1 stop7h 29m
Thu 11/196:00 am -
1 stop11h 45m
Deal found 10/21![Frontier logo]()
$164
This Southwest deal was found by Cheapflights users on 10/20. 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 11/196:05 am -
Nonstop2h 55m
Mon 11/238:40 pm -
Nonstop2h 15m
Deal found 10/20![Southwest logo]()
$165
This United Airlines deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/215:48 pm -
Nonstop2h 55m
Mon 11/237:45 am -
Nonstop2h 34m
Deal found 10/21![United Airlines logo]()
$165
This Cheapflightsfares deal was found by Cheapflights users on 10/21. 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.
Sat 11/215:15 am -
1 stop10h 46m
Sat 11/219:26 pm -
Nonstop2h 27m
Deal found 10/21![Frontier logo]()
$166
This Kiwi.com deal was found by Cheapflights users on 10/23. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/45:02 pm -
1 stop14h 27m
Mon 12/76:41 am -
1 stop9h 35m
Deal found 10/23![Frontier logo]()
$167
This Cheapflightsfares deal was found by Cheapflights users on 10/21. 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.
Sun 12/207:45 am -
Nonstop3h 04m
Sun 12/278:59 pm -
Nonstop2h 27m
Deal found 10/21![Frontier logo]()
$167
This Frontier deal was found by Cheapflights users on 10/22. 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.
Fri 12/1111:00 am -
1 stop5h 46m
Fri 12/118:40 pm -
1 stop12h 05m
Deal found 10/22![Frontier logo]()
$168
This Frontier deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/47:00 am -
Nonstop3h 02m
Wed 12/169:26 pm -
Nonstop2h 28m
Deal found 10/21![Frontier logo]()
$168
This Southwest deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” 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 11/125:55 am -
Nonstop2h 50m
Tue 11/172:25 pm -
1 stop4h 15m
Deal found 10/24![Southwest logo]()
$169
This Frontier deal was found by Cheapflights users on 10/20. 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.
Fri 12/255:40 am -
1 stop10h 16m
Thu 12/318:59 pm -
Nonstop2h 27m
Deal found 10/20![Frontier logo]()
$169
This Trip.com deal was found by Cheapflights users on 10/22. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/68:37 pm -
1 stop14h 12m
Sun 12/138:40 pm -
1 stop12h 05m
Deal found 10/22![Frontier logo]()
$170
Best flights from Illinois to DenverDiscover carefully curated flight deals from Illinois to Denver that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 25, 2026.
Discover carefully curated flight deals from Illinois to Denver that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 25, 2026.
This United Airlines deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/219:47 pm -
Nonstop2h 44m
Fri 11/278:25 pm -
Nonstop2h 34m
Deal found 10/21![United Airlines logo]()
$165
This Southwest deal was found by Cheapflights users on 10/22. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/1110:40 am -
Nonstop2h 45m
Fri 12/116:45 pm -
Nonstop2h 15m
Deal found 10/22![Southwest logo]()
$165
This Delta deal was found by Cheapflights users on 10/23. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1412:38 pm -
1 stop4h 24m
Sun 11/156:10 am -
1 stop6h 49m
Deal found 10/23![Delta logo]()
$199
This Kiwi.com deal was found by Cheapflights users on 10/21. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/151:08 pm -
1 stop29h 14m
Wed 11/1810:44 pm -
1 stop12h 03m
Deal found 10/21![Multiple Airlines logo]()
$326
This United Airlines deal was found by Cheapflights users on 10/22. 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 11/219:47 pm -
Nonstop2h 44m
Thu 11/266:00 am -
Nonstop2h 40m
Deal found 10/22![United Airlines logo]()
$165
This Southwest deal was found by Cheapflights users on 10/22. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/146:05 am -
Nonstop2h 55m
Mon 12/1411:05 am -
1 stop5h 00m
Deal found 10/22![Southwest logo]()
$171
This American Airlines deal was found by Cheapflights users on 10/23. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/133:58 pm -
1 stop7h 29m
Mon 11/166:11 pm -
1 stop4h 48m
Deal found 10/23![American Airlines logo]()
$359
This Sun Country Air deal was found by Cheapflights users on 10/20. 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 Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/2110:45 am -
1 stop7h 22m
Sun 12/277:20 pm -
1 stop22h 20m
Deal found 10/20![Sun Country Air logo]()
$365
This United Airlines deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/131:00 pm -
Nonstop2h 50m
Sun 11/158:25 pm -
Nonstop2h 34m
Deal found 10/23![United Airlines logo]()
$173
This Southwest deal was found by Cheapflights users on 10/20. 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 12/41:20 pm -
1 stop5h 05m
Fri 12/111:20 pm -
1 stop3h 25m
Deal found 10/20![Southwest logo]()
$176
This Delta deal was found by Cheapflights users on 10/21. 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.
Thu 11/1910:34 am -
1 stop6h 28m
Sun 11/2211:08 am -
1 stop4h 31m
Deal found 10/21![Delta logo]()
$199
This Southwest deal was found by Cheapflights users on 10/23. 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 11/1810:15 am -
1 stop4h 30m
Sun 11/228:40 pm -
Nonstop2h 15m
Deal found 10/23![Southwest logo]()
$178
This Southwest deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/101:20 pm -
1 stop5h 05m
Sun 12/136:30 am -
1 stop4h 10m
Deal found 10/23![Southwest logo]()
$187
This United Airlines deal was found by Cheapflights users on 10/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/259:00 pm -
Nonstop2h 44m
Sat 11/286:00 am -
Nonstop2h 40m
Deal found 10/20![United Airlines logo]()
$250
This Delta deal was found by Cheapflights users on 10/22. 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.
Sat 11/2112:30 pm -
1 stop4h 32m
Sat 11/286:10 am -
1 stop5h 41m
Deal found 10/22![Delta logo]()
$286
This Southwest deal was found by Cheapflights users on 10/23. 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.
Mon 11/3010:50 pm -
Nonstop2h 50m
Thu 12/37:05 am -
Nonstop2h 25m
Deal found 10/23![Southwest logo]()
$219
This Kiwi.com deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” 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 11/2412:22 pm -
1 stop13h 32m
Tue 12/110:36 pm -
1 stop15h 35m
Deal found 10/24![Multiple Airlines logo]()
$329
This Southwest deal was found by Cheapflights users on 10/21. 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 12/255:05 pm -
Nonstop2h 45m
Thu 12/317:05 am -
Nonstop2h 25m
Deal found 10/21![Southwest logo]()
$250
This Kiwi.com deal was found by Cheapflights users on 10/20. 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.
Sun 1/312:27 pm -
1 stop24h 51m
Wed 1/1310:50 pm -
1 stop12h 02m
Deal found 10/20![Multiple Airlines logo]()
$370
This Delta deal was found by Cheapflights users on 10/21. 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.
Mon 11/236:23 am -
1 stop6h 57m
Sat 11/286:10 am -
1 stop6h 54m
Deal found 10/21![Delta logo]()
$355
This Southwest deal was found by Cheapflights users on 10/20. 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 1/158:35 pm -
Nonstop2h 45m
Mon 1/1811:00 am -
1 stop4h 45m
Deal found 10/20![Southwest logo]()
$254
This United Airlines deal was found by Cheapflights users on 10/20. 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.
Thu 12/248:31 am -
Nonstop2h 49m
Tue 1/55:43 pm -
Nonstop2h 16m
Deal found 10/20![United Airlines logo]()
$339
This Kiwi.com deal was found by Cheapflights users on 10/23. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/97:36 pm -
1 stop26h 54m
Sat 12/126:41 am -
1 stop12h 17m
Deal found 10/23![Multiple Airlines logo]()
$379
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.
Thu 4/224:00 pm -
1 stop7h 17m
Mon 4/263:10 pm -
1 stop6h 13m
Deal found 10/25![Delta logo]()
$359
This American Airlines deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/46:00 am -
1 stop6h 41m
Tue 12/89:14 am -
1 stop4h 36m
Deal found 10/21![American Airlines logo]()
$487
This Kiwi.com deal was found by Cheapflights users on 10/23. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/229:02 pm -
1 stop13h 52m
Wed 12/3010:44 pm -
1 stop11h 53m
Deal found 10/23![Multiple Airlines logo]()
$379
This United Airlines deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” 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 12/2810:00 pm -
Nonstop2h 53m
Wed 1/68:25 pm -
Nonstop2h 33m
Deal found 10/24![United Airlines logo]()
$347
This Delta deal was found by Cheapflights users on 10/21. 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.
Mon 11/236:01 am -
1 stop7h 00m
Thu 11/267:10 am -
1 stop6h 44m
Deal found 10/21![Delta logo]()
$359
This Southwest deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/246:00 am -
Nonstop2h 45m
Fri 11/278:30 am -
1 stop5h 25m
Deal found 10/21![Southwest logo]()
$270
This American Airlines deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/96:00 am -
2 stops10h 33m
Sat 12/1212:24 pm -
2 stops10h 58m
Deal found 10/22![American Airlines logo]()
$488
Last-minute flights from Illinois to DenverDiscover last-minute flight deals from Illinois to Denver. Data last updated October 25, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Denver. Data last updated October 25, 2026 and is based on user searches.
This Cheapflightsfares deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” 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 stop11h 09m
Mon 11/98:55 pm -
Nonstop2h 26m
Deal found 10/24![Frontier logo]()
$167
This Frontier deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” 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 11/76:30 am -
Nonstop2h 56m
Mon 11/98:55 pm -
Nonstop2h 26m
Deal found 10/24![Frontier logo]()
$168
This Southwest deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” 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 11/125:55 am -
Nonstop2h 50m
Tue 11/172:25 pm -
1 stop4h 15m
Deal found 10/24![Southwest logo]()
$169
This Southwest deal was found by Cheapflights users on 10/21. 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 11/135:20 pm -
1 stop3h 45m
Mon 11/167:05 am -
Nonstop2h 25m
Deal found 10/21![Southwest logo]()
$171
This Frontier deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/165:15 pm -
1 stop7h 29m
Sat 11/217:50 pm -
1 stop8h 20m
Deal found 10/21![Frontier logo]()
$164
This Frontier deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/166:30 am -
Nonstop2h 56m
Mon 11/166:42 pm -
1 stop9h 31m
Deal found 10/21![Frontier logo]()
$169
This Southwest deal was found by Cheapflights users on 10/23. 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 11/188:55 pm -
Nonstop2h 45m
Sun 11/228:40 pm -
Nonstop2h 15m
Deal found 10/23![Southwest logo]()
$172
This Southwest deal was found by Cheapflights users on 10/20. 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 11/196:05 am -
Nonstop2h 55m
Mon 11/238:40 pm -
Nonstop2h 15m
Deal found 10/20![Southwest logo]()
$165
This United Airlines deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/215:48 pm -
Nonstop2h 55m
Mon 11/237:45 am -
Nonstop2h 34m
Deal found 10/21![United Airlines logo]()
$165
This Cheapflightsfares deal was found by Cheapflights users on 10/21. 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.
Sat 11/215:15 am -
1 stop10h 46m
Sat 11/219:26 pm -
Nonstop2h 27m
Deal found 10/21![Frontier logo]()
$166
This Priceline deal was found by Cheapflights users on 10/21. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/2310:00 pm -
1 stop12h 30m
Fri 11/279:26 pm -
Nonstop2h 27m
Deal found 10/21![Frontier logo]()
$171
This Kiwi.com deal was found by Cheapflights users on 10/22. 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.
Wed 11/256:40 am -
Nonstop2h 56m
Tue 12/19:26 pm -
Nonstop2h 27m
Deal found 10/22![Frontier logo]()
$170
One-way flights from Illinois to DenverSearch for one-way flight options from Illinois to Denver. Find affordable one-way fares based on user searches. Data last updated October 25, 2026.
Search for one-way flight options from Illinois to Denver. Find affordable one-way fares based on user searches. Data last updated October 25, 2026.
This Kiwi.com deal was found by Cheapflights users on 10/20. 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.
Wed 11/187:35 pm -
2 stops17h 33m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/20![Frontier logo]()
$107
This Southwest deal was found by Cheapflights users on 10/20. 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 11/2612:45 pm -
Nonstop2h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/20![Southwest logo]()
$107
This Priceline deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/256:40 am -
Nonstop2h 56m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/24![Frontier logo]()
$108
This Mytrip deal was found by Cheapflights users on 10/22. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/137:50 pm -
2 stops17h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/22![Frontier logo]()
$109
This Kiwi.com deal was found by Cheapflights users on 10/21. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1212:20 pm -
1 stop10h 14m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Frontier logo]()
$109
This Booking.com deal was found by Cheapflights users on 10/21. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/177:35 pm -
2 stops21h 18m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Frontier logo]()
$110
This Booking.com deal was found by Cheapflights users on 10/21. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/176:42 pm -
2 stops22h 11m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Frontier logo]()
$110
This Super.com deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/297:45 am -
Nonstop3h 04m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Frontier logo]()
$111
This Kiwi.com deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” 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 11/116:08 am -
2 stops18h 14m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/24![Frontier logo]()
$111
This Super.com deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” 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 11/246:40 am -
Nonstop2h 56m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/24![Frontier logo]()
$112
This Kiwi.com deal was found by Cheapflights users on 10/22. 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.
Thu 11/129:30 am -
2 stops37h 04m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/22![Multiple Airlines logo]()
$113
This Frontier deal was found by Cheapflights users on 10/22. 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.
Mon 11/167:50 pm -
2 stops21h 03m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/22![Frontier logo]()
$113
Find flight deals from Illinois to Denver
Keep the following information in mind while searching for Illinois to Denver flight deals. Data was last updated October 25, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $164 (Travelocity) |
One-way from | $107 (Kiwi.com) |
Popular in | July |
Cheapest in | January |
Average price | $283 |
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 Denver 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 25, 2026.
Use the filters below to find and compare flights from Illinois to Denver 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
Fri 11/20
5:55 am-7:45 am
Nonstop2h 50m
Denver Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$114
ChicagoDenver
ORD Chicago O'Hare Intl - DEN Denver Intl
ORDDEN
Chicago O'Hare Intl
Thu 11/26
10:55 am-12:45 pm
Nonstop2h 50m
Denver Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$122
ChicagoDenver
ORD Chicago O'Hare Intl - DEN Denver Intl
ORDDEN
Chicago O'Hare Intl
Mon 11/23
6:23 am-12:20 pm
1 stop6h 57m
Denver Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$132
ChicagoDenver
ORD Chicago O'Hare Intl - DEN Denver Intl
ORDDEN
Chicago O'Hare Intl
Sat 12/19
7:12 pm-11:15 pm
1 stop5h 03m
Denver Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$132
ChicagoDenver
ORD Chicago O'Hare Intl - DEN Denver Intl
ORDDEN
Chicago O'Hare Intl
Wed 11/18
9:47 pm-11:30 pm
Nonstop2h 43m
Denver Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$133
ChicagoDenver
RFD Chicago Greater Rockford - DEN Denver Intl
RFDDEN
Chicago Greater Rockford
Mon 11/16
7:03 pm-8:22 am
2 stops38h 19m
Denver Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$137
ChicagoDenver
MDW Chicago Midway - DEN Denver Intl
MDWDEN
Chicago Midway
Wed 11/25
9:30 am-3:14 pm
1 stop6h 44m
Denver Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$140
ChicagoDenver
RFD Chicago Greater Rockford - DEN Denver Intl
RFDDEN
Chicago Greater Rockford
Sun 12/13
12:47 pm-8:40 am
2 stops44h 53m
Denver Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$142
ChicagoDenver
MDW Chicago Midway - DEN Denver Intl
MDWDEN
Chicago Midway
Mon 11/30
4:20 pm-9:00 pm
1 stop5h 40m
Denver Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$153
ChicagoDenver
MDW Chicago Midway - DEN Denver Intl
MDWDEN
Chicago Midway
Sun 12/6
9:25 pm-11:15 pm
Nonstop2h 50m
Denver Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$159
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Illinois to Denver
Have a flexible travel schedule? Discover the best time to fly to Denver from Illinois with our price prediction graph.
ORD-DEN
MDW-DEN
RFD-DEN
BMI-DEN
MLI-DEN
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 Denver
USIL-DEN
ORD-DEN
MDW-DEN
RFD-DEN
BMI-DEN
What is the cheapest month to book a flight from Illinois to Denver?
Currently, January is the cheapest month in which you can book a flight from Illinois to Denver (average of $230). Flying from Illinois to Denver in June is currently the most expensive (average of $324). 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 DEN?
Find hourly flight availability from Illinois to Denver. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 25, 2026.
A simple way to save on the total cost of your ticket is to fly from Illinois to Denver in the evening. If you’re flexible enough to do this you can expect to save up to 31% on your trip compared to booking a flight in the morning.
Weekly flight availability from Illinois to Denver
Explore weekly flight availability from Illinois to Denver. 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 October 25, 2026.
The most flights from USIL to DEN are scheduled on a Friday (71 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (11 on average).
How much does it cost to fly round-trip from Illinois to Denver?
Airfare is below average for this route at the moment.
Illinois to Denver flights typically cost between $206 and $382 in November.The cheapest round-trip price found within the last 5 days was $164 on Frontier (Nov 16-Nov 18).
How far ahead should I book a flight from Illinois to Denver?
To ensure you get the cheapest price possible for a flight from Illinois to Denver, you should look to book at least 84 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
What is the cheapest day to fly from Illinois to Denver?
Use this chart to determine the cheapest time to fly round-trip from Illinois to Denver. Price data was last updated on October 24, 2026.
Travelers seeking maximum savings on their Illinois to Denver flight should consider departing on Monday at noon when fares are most often at their lowest. Monday mornings 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 Illinois to Denver. 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 Denver?
Book flights to Denver if you plan to visit one of these locationsThornton
Westminster
Lakewood
Centennial
Broomfield
Englewood
Golden
Black Hawk
Wheat Ridge
Silverthorne
Fort Morgan
Greeley
Frisco
Winter Park
Limon
Central City
Manitou Springs
Glendale
Cripple Creek
Evergreen
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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Alternative routes for Illinois to Denver
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Complete your trip
Complete your trip to Denver by adding a car rental and/or hotel reservation to your travel itinerary.
Other flights to Denver
Explore flights to Denver departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on October 25, 2026.
Search flights from Illinois to Denver by cabin class
Find flights from Illinois to Denver, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Illinois and Denver flights
Browse other Illinois and Denver flight options. Last updated on October 25, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Illinois to Denver flights
Consider these flights traveling from Illinois to Denver.
Top 7 airlines flying from Illinois to Denver
Discover the top 7 airlines that operate flights from Illinois to Denver. 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 25, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$70 | Average$194 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$98 | Average$280 | FlexibilityNo cancel fee | On-time88% | |
| Cheapest$105 | Average$323 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$145 | Average$223 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$176 | Average$406 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$178 | Average$397 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$187 | Average$323 | FlexibilityNo cancel fee | On-time63% |