$95+ Cheap flights from Denver (DEN) to Illinois
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 11/1. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — ORD
Nov 19 — Nov 261
Round-trip
1 adult, Economy
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Find cheap flights from Denver to Illinois with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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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 Denver to Illinois
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Cheapest flights from Denver to IllinoisExplore the most affordable flight options available from Denver to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 20, 2026.
Explore the most affordable flight options available from Denver to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 20, 2026.
This Frontier deal was found by Cheapflights users on 10/17. Clicking the “Pick Dates” 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 11/237:50 pm -
1 stop8h 20m
Fri 12/47:00 am -
Nonstop3h 02m
Deal found 10/17![Frontier logo]()
$197
This Cheapflightsfares deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” 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 11/91:05 pm -
1 stop15h 08m
Fri 11/136:30 am -
Nonstop2h 56m
Deal found 10/16![Frontier logo]()
$198
This Frontier deal was found by Cheapflights users on 10/17. Clicking the “Pick Dates” 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 11/249:26 pm -
1 stop9h 21m
Mon 12/77:25 am -
Nonstop3h 04m
Deal found 10/17![Frontier logo]()
$199
This Southwest deal was found by Cheapflights users on 10/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/24:15 pm -
Nonstop2h 20m
Wed 12/96:05 am -
Nonstop2h 55m
Deal found 10/18![Southwest logo]()
$199
This Kiwi.com deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” 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 11/58:55 pm -
Nonstop2h 26m
Sat 11/74:36 pm -
1 stop5h 58m
Deal found 10/15![Frontier logo]()
$200
This Frontier deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/257:20 pm -
1 stop11h 54m
Wed 12/210:21 am -
1 stop12h 29m
Deal found 10/19![Frontier logo]()
$200
This Kiwi.com deal was found by Cheapflights users on 10/17. Clicking the “Pick Dates” 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 11/229:26 pm -
Nonstop2h 27m
Mon 12/77:25 am -
Nonstop3h 04m
Deal found 10/17![Frontier logo]()
$201
This Kiwi.com deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/178:55 pm -
Nonstop2h 26m
Wed 11/256:40 am -
Nonstop2h 56m
Deal found 10/19![Frontier logo]()
$202
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 12/48:46 pm -
1 stop11h 59m
Sun 12/68:37 pm -
1 stop14h 12m
Deal found 10/20![Frontier logo]()
$202
This Frontier deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” 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 10/318:55 pm -
Nonstop2h 26m
Wed 11/46:30 am -
Nonstop2h 56m
Deal found 10/16![Frontier logo]()
$203
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/219:26 pm -
Nonstop2h 27m
Fri 11/2712:05 pm -
1 stop13h 02m
Deal found 10/20![Frontier logo]()
$204
This Cheapflightsfares deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/88:40 pm -
1 stop12h 05m
Wed 12/1610:40 am -
1 stop6h 03m
Deal found 10/19![Frontier logo]()
$204
Best flights from Denver to IllinoisDiscover carefully curated flight deals from Denver to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 20, 2026.
Discover carefully curated flight deals from Denver to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 20, 2026.
This Southwest deal was found by Cheapflights users on 10/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/511:45 am -
1 stop4h 20m
Mon 12/78:55 pm -
Nonstop2h 45m
Deal found 10/18![Southwest logo]()
$245
This Kiwi.com deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/38:55 pm -
1 stop15h 45m
Sat 11/73:35 pm -
1 stop17h 51m
Deal found 10/19![Multiple Airlines logo]()
$254
This United Airlines deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/197:09 pm -
Nonstop2h 33m
Mon 12/2810:00 pm -
Nonstop2h 53m
Deal found 10/19![United Airlines logo]()
$280
This Delta deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” 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 11/66:20 am -
1 stop5h 39m
Sun 11/86:20 am -
1 stop4h 42m
Deal found 10/16![Delta logo]()
$327
This American Airlines deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” 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 11/66:11 pm -
1 stop4h 48m
Mon 11/93:58 pm -
1 stop7h 22m
Deal found 10/16![American Airlines logo]()
$359
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 1/46:00 am -
1 stop10h 59m
Mon 1/48:59 pm -
2 stops18h 08m
Deal found 10/20![Alaska Airlines logo]()
$519
This Southwest deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/107:05 am -
Nonstop2h 25m
Sun 12/1310:05 am -
1 stop4h 20m
Deal found 10/19![Southwest logo]()
$265
This Southwest deal was found by Cheapflights users on 10/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/134:10 pm -
1 stop4h 50m
Mon 11/161:20 pm -
1 stop5h 05m
Deal found 10/18![Southwest logo]()
$301
This Delta deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” 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 12/181:26 pm -
1 stop5h 19m
Tue 12/227:10 pm -
1 stop5h 06m
Deal found 10/16![Delta logo]()
$337
This United Airlines deal was found by Cheapflights users on 10/17. Clicking the “Pick Dates” 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 12/45:40 pm -
Nonstop2h 22m
Sun 12/68:53 am -
Nonstop2h 42m
Deal found 10/17![United Airlines logo]()
$339
This American Airlines deal was found by Cheapflights users on 10/17. Clicking the “Pick Dates” 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.
Tue 11/246:46 am -
1 stop6h 13m
Fri 11/272:44 pm -
2 stops9h 15m
Deal found 10/17![American Airlines logo]()
$364
This Southwest deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” 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 12/46:05 pm -
Nonstop2h 20m
Sun 12/68:55 am -
Nonstop2h 50m
Deal found 10/15![Southwest logo]()
$307
This United Airlines deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” 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 12/233:50 pm -
Nonstop2h 40m
Mon 12/2810:00 pm -
Nonstop2h 53m
Deal found 10/16![United Airlines logo]()
$346
This Delta deal was found by Cheapflights users on 10/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/147:10 am -
1 stop7h 35m
Tue 11/176:01 am -
1 stop7h 00m
Deal found 10/18![Delta logo]()
$359
This Southwest deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” 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 11/66:30 pm -
1 stop5h 40m
Mon 11/99:25 pm -
Nonstop2h 50m
Deal found 10/15![Southwest logo]()
$307
This Delta deal was found by Cheapflights users on 10/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/132:24 pm -
1 stop7h 07m
Tue 11/176:01 am -
1 stop8h 18m
Deal found 10/18![Delta logo]()
$359
This Delta deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” 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 11/72:36 pm -
1 stop7h 00m
Mon 11/94:28 pm -
1 stop7h 47m
Deal found 10/16![Delta logo]()
$359
This Southwest deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” 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 11/56:30 pm -
1 stop5h 40m
Sun 11/85:55 am -
Nonstop2h 50m
Deal found 10/15![Southwest logo]()
$327
This American Airlines deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” 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 11/1812:24 pm -
1 stop4h 54m
Tue 11/242:29 pm -
1 stop6h 30m
Deal found 10/15![American Airlines logo]()
$452
This United Airlines deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/248:30 pm -
1 stop10h 41m
Sat 2/276:55 pm -
1 stop24h 15m
Deal found 10/19![United Airlines logo]()
$420
This Delta deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” 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 11/128:10 am -
1 stop6h 35m
Sun 11/154:28 pm -
1 stop7h 47m
Deal found 10/15![Delta logo]()
$359
This Southwest deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” 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 11/94:10 pm -
1 stop4h 50m
Sat 11/1410:20 am -
2 stops8h 10m
Deal found 10/15![Southwest logo]()
$332
This Alaska Airlines deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/2612:19 pm -
2 stops23h 49m
Mon 11/309:01 pm -
2 stops18h 23m
Deal found 10/19![Alaska Airlines logo]()
$563
This Delta deal was found by Cheapflights users on 10/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/142:24 pm -
1 stop7h 07m
Mon 11/164:28 pm -
1 stop7h 47m
Deal found 10/18![Delta logo]()
$359
This United Airlines deal was found by Cheapflights users on 10/17. Clicking the “Pick Dates” 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 11/199:35 am -
Nonstop2h 40m
Thu 11/199:00 pm -
Nonstop2h 44m
Deal found 10/17![United Airlines logo]()
$435
This American Airlines deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/188:07 am -
1 stop5h 30m
Wed 11/253:01 pm -
2 stops10h 38m
Deal found 10/19![American Airlines logo]()
$482
This Southwest deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/199:30 pm -
Nonstop2h 20m
Mon 12/2810:50 pm -
Nonstop2h 50m
Deal found 10/19![Southwest logo]()
$351
This Alaska Airlines deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” 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.
Sat 11/216:51 pm -
2 stops10h 05m
Fri 11/276:00 am -
1 stop12h 53m
Deal found 10/16![Alaska Airlines logo]()
$568
This Delta deal was found by Cheapflights users on 10/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/132:24 pm -
1 stop7h 07m
Mon 11/164:28 pm -
1 stop6h 39m
Deal found 10/18![Delta logo]()
$359
This American Airlines deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/235:30 am -
1 stop7h 32m
Tue 12/296:43 pm -
1 stop6h 49m
Deal found 10/19![American Airlines logo]()
$484
Last-minute flights from Denver to IllinoisDiscover last-minute flight deals from Denver to Illinois. Data last updated October 20, 2026 and is based on user searches.
Discover last-minute flight deals from Denver to Illinois. Data last updated October 20, 2026 and is based on user searches.
This Cheapflightsfares deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/288:55 pm -
Nonstop2h 26m
Wed 11/46:30 am -
Nonstop2h 56m
Deal found 10/19![Frontier logo]()
$201
This Frontier deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/288:55 pm -
Nonstop2h 26m
Fri 11/66:30 am -
Nonstop2h 56m
Deal found 10/19![Frontier logo]()
$203
This Frontier deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/288:55 pm -
Nonstop2h 26m
Tue 11/36:30 am -
Nonstop2h 56m
Deal found 10/19![Frontier logo]()
$208
This Frontier deal was found by Cheapflights users on 10/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/298:55 pm -
Nonstop2h 26m
Wed 11/46:30 am -
Nonstop2h 56m
Deal found 10/17![Frontier logo]()
$213
This Cheapflightsfares deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” 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 10/308:55 pm -
Nonstop2h 26m
Tue 11/36:30 am -
Nonstop2h 56m
Deal found 10/16![Frontier logo]()
$216
This Frontier deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/910:41 am -
1 stop12h 06m
Thu 11/1212:20 pm -
1 stop10h 14m
Deal found 10/19![Frontier logo]()
$210
This Southwest deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/95:45 pm -
1 stop5h 25m
Sat 11/146:25 pm -
Nonstop2h 55m
Deal found 10/19![Southwest logo]()
$217
This Kiwi.com deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/169:19 pm -
1 stop13h 03m
Mon 11/238:42 pm -
1 stop14h 31m
Deal found 10/19![Frontier logo]()
$208
This Delta deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/226:10 am -
1 stop5h 41m
Wed 12/25:30 pm -
1 stop7h 19m
Deal found 10/19![Delta logo]()
$199
This Southwest deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/238:40 pm -
Nonstop2h 15m
Mon 11/3010:50 pm -
Nonstop2h 50m
Deal found 10/19![Southwest logo]()
$213
This Southwest deal was found by Cheapflights users on 10/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/245:05 am -
Nonstop2h 15m
Tue 12/18:55 pm -
Nonstop2h 45m
Deal found 10/18![Southwest logo]()
$214
This Frontier deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/257:20 pm -
1 stop11h 54m
Wed 12/210:21 am -
1 stop12h 29m
Deal found 10/19![Frontier logo]()
$200
One-way flights from Denver to IllinoisSearch for one-way flight options from Denver to Illinois. Find affordable one-way fares based on user searches. Data last updated October 20, 2026.
Search for one-way flight options from Denver to Illinois. Find affordable one-way fares based on user searches. Data last updated October 20, 2026.
This Super.com deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/110:20 am -
Nonstop1h 59m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/19![Allegiant Air logo]()
$95
This Super.com deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2910:20 am -
Nonstop1h 59m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/19![Allegiant Air logo]()
$104
This Super.com deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/174:09 pm -
1 stop6h 04m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/19![Frontier logo]()
$107
This Southwest deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/37:05 am -
Nonstop2h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/19![Southwest logo]()
$107
This Super.com deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” 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 11/217:50 pm -
1 stop8h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/16![Frontier logo]()
$108
This Super.com deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” 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 11/1810:41 am -
1 stop6h 06m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/15![Frontier logo]()
$108
This Kiwi.com deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” 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 12/278:59 pm -
Nonstop2h 27m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/16![Frontier logo]()
$109
This Kiwi.com deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” 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 11/259:26 pm -
Nonstop2h 27m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/16![Frontier logo]()
$110
This Delta deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/186:30 am -
1 stop4h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/19![Delta logo]()
$110
This Super.com deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” 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.
Sun 11/88:55 pm -
Nonstop2h 26m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/16![Frontier logo]()
$111
This CheapOair deal was found by Cheapflights users on 10/17. Clicking the “Pick Dates” 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.
Wed 11/1110:41 am -
1 stop6h 06m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/17![Frontier logo]()
$113
This Super.com deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” 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 11/107:10 pm -
1 stop20h 57m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/16![Frontier logo]()
$114
Find flight deals from Denver to Illinois
Keep the following information in mind while searching for Denver to Illinois flight deals. Data was last updated October 20, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $197 (Frontier) |
One-way from | $95 (Super.com) |
Popular in | July |
Cheapest in | January |
Average price | $289 |
Good round-trip deal | $315 or less |
Good one-way deal | $187 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Denver to Illinois 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 20, 2026.
Use the filters below to find and compare flights from Denver to Illinois that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
DenverChicago
DEN Denver Intl - MDW Chicago Midway
DENMDW
Denver Intl
Thu 12/31
6:05 pm-9:30 pm
Nonstop2h 25m
Chicago Midway
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$107
DenverChicago
DEN Denver Intl - MDW Chicago Midway
DENMDW
Denver Intl
Sun 12/27
12:55 am-8:50 am
1 stop6h 55m
Chicago Midway
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$117
Quickest round-trip
DenverChicago
DEN Denver Intl - MDW Chicago Midway
DENMDW
Denver Intl
Sun 12/20
6:45 pm-10:00 pm
Nonstop2h 15m
Chicago Midway
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$139
DenverChicago
DEN Denver Intl - MDW Chicago Midway
DENMDW
Denver Intl
Thu 12/24
11:05 am-5:05 pm
1 stop5h 00m
Chicago Midway
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$144
DenverChicago
DEN Denver Intl - MDW Chicago Midway
DENMDW
Denver Intl
Sat 12/5
5:30 pm-8:50 pm
Nonstop2h 20m
Chicago Midway
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$149
DenverChicago
DEN Denver Intl - ORD Chicago O'Hare Intl
DENORD
Denver Intl
Sun 11/8
10:44 pm-5:13 am
1 stop29h 29m
Chicago O'Hare Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$151
DenverChicago
DEN Denver Intl - MDW Chicago Midway
DENMDW
Denver Intl
Wed 12/30
8:55 pm-12:15 am
Nonstop2h 20m
Chicago Midway
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$158
DenverChicago
DEN Denver Intl - MDW Chicago Midway
DENMDW
Denver Intl
Mon 12/14
6:30 am-11:59 am
1 stop4h 29m
Chicago Midway
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$159
DenverChicago
DEN Denver Intl - MDW Chicago Midway
DENMDW
Denver Intl
Tue 12/29
6:45 pm-11:20 pm
1 stop3h 35m
Chicago Midway
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$159
DenverChicago
DEN Denver Intl - MDW Chicago Midway
DENMDW
Denver Intl
Thu 11/26
5:50 am-2:50 pm
2 stops8h 00m
Chicago Midway
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$164
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Denver to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from Denver with our price prediction graph.
DEN-PIA
DEN-ORD
DEN-MDW
DEN-SPI
DEN-BMI
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 Denver to Illinois
DEN-USIL
DEN-PIA
DEN-ORD
DEN-MDW
DEN-SPI
What is the cheapest month to book a flight from Denver to Illinois?
Currently, January is the cheapest month in which you can book a flight from Denver to Illinois (average of $238). Flying from Denver to Illinois in July 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 DEN to IL?
Find hourly flight availability from Denver to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 20, 2026.
It’s optimal to fly from Denver to Illinois in the morning. By choosing this option you can save up to 18% on the cost of your flight, compared to a flight at noon.
Weekly flight availability from Denver to Illinois
Explore weekly flight availability from Denver to Illinois. 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 20, 2026.
The most flights from DEN to USIL are scheduled on a Friday (77 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (60 on average).
How much does it cost to fly round-trip from Denver to Illinois?
Airfare is below average for this route at the moment.
Denver to Illinois flights typically cost between $239 and $405 in November.The cheapest round-trip price found within the last 5 days was $197 on Frontier (Nov 23-Dec 4).
How far ahead should I book a flight from Denver to Illinois?
To ensure you get the cheapest price possible for a flight from Denver to Illinois, you should look to book at least 89 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 Denver to Illinois?
Use this chart to determine the cheapest time to fly round-trip from Denver to Illinois. Price data was last updated on October 17, 2026.
Travelers seeking maximum savings on their Denver to Illinois flight should consider departing on Friday at noon when fares are most often at their lowest. Saturday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Reviews of airlines servicing Illinois
Get insights into the airlines that provide service to Illinois. 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 Illinois. Reviews last updated October 20, 2026.
Read through reviews of airlines operating flights from Denver to Illinois, such as Southwest,United Airlines, andAllegiant Air. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Overall
7.9
Reviews
1 / 20
10.0
ExcellentCourtney,Sep 2026
DEN - STL
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Overall
7.9
Reviews
1 / 20
10.0
ExcellentCourtney,Sep 2026
DEN - STL
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Overall
7.9
Reviews
1 / 20
10.0
ExcellentCourtney,Sep 2026
DEN - STL
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Overall
7.9
Reviews
1 / 20
10.0
ExcellentCourtney,Sep 2026
DEN - STL
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Overall
7.9
Reviews
1 / 20
10.0
ExcellentCourtney,Sep 2026
DEN - STL
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Overall
7.9
Reviews
1 / 20
10.0
ExcellentCourtney,Sep 2026
DEN - STL
Related info for your journey
Find useful and relevant information for your journey from Denver to Illinois. 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 Denver to Illinois
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Complete your trip
Complete your trip to Illinois by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Denver to Illinois by cabin class
Find flights from Denver to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Denver and Illinois flights
Browse other Denver and Illinois flight options. Last updated on October 20, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Denver to Illinois flights
Consider these flights traveling from Denver to Illinois.
Top 6 airlines flying from Denver to Illinois
Discover the top 6 airlines that operate flights from Denver to Illinois. 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 20, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$81 | Average$202 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$100 | Average$232 | FlexibilityNo cancel fee | On-time88% | |
| Cheapest$138 | Average$281 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$170 | Average$329 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$176 | Average$399 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$190 | Average$378 | FlexibilityNo cancel fee | On-time69% |