$111+ Cheap flights from Colorado Springs (COS) to Illinois
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/16. Fares are subject to change and may not be available on all flights or dates of travel.
COS — ORD
Apr 16 — Apr 231
Round-trip
1 adult, Economy
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Cheapest flights from Colorado Springs to IllinoisExplore the most affordable flight options available from Colorado Springs to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 17, 2026.
Explore the most affordable flight options available from Colorado Springs to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 17, 2026.
This American Airlines deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” 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.
Sat 5/212:22 pm
COS
- ORD
Nonstop2h 47m
American Airlines
Sat 5/99:53 am
ORD
- COS
Nonstop2h 59m
American Airlines
Deal found 3/13![American Airlines logo]()
$221
This Kiwi.com deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/306:46 pm
COS
- ORD
1 stop21h 14m
Multiple Airlines
Sun 5/37:45 am
ORD
- COS
1 stop11h 11m
Multiple Airlines
Deal found 3/12![Multiple Airlines logo]()
$230
This Kiwi.com deal was found by Cheapflights users on 3/16. 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.
Thu 4/306:46 pm
COS
- MDW
1 stop18h 48m
Multiple Airlines
Sun 5/36:20 am
MDW
- COS
1 stop12h 36m
Multiple Airlines
Deal found 3/16![Multiple Airlines logo]()
$239
This Southwest deal was found by Cheapflights users on 3/15. 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 5/74:05 pm
COS
- STL
1 stop7h 10m
Southwest
Sat 5/95:50 pm
STL
- COS
1 stop3h 55m
Southwest
Deal found 3/15![Southwest logo]()
$241
This Southwest deal was found by Cheapflights users on 3/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/296:30 am
COS
- MDW
1 stop7h 55m
Southwest
Sat 5/25:10 am
MDW
- COS
1 stop8h 25m
Southwest
Deal found 3/16![Southwest logo]()
$241
This Southwest deal was found by Cheapflights users on 3/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/296:00 am
COS
- ORD
1 stop6h 55m
Southwest
Sat 5/27:00 am
ORD
- COS
1 stop6h 35m
Southwest
Deal found 3/16![Southwest logo]()
$241
This American Airlines deal was found by Cheapflights users on 3/15. 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 4/2912:22 pm
COS
- ORD
Nonstop2h 47m
American Airlines
Wed 5/69:53 am
ORD
- COS
Nonstop2h 59m
American Airlines
Deal found 3/15![American Airlines logo]()
$242
This American Airlines deal was found by Cheapflights users on 3/16. 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.
Wed 4/2912:22 pm
COS
- ORD
Nonstop2h 47m
American Airlines
Sat 5/29:53 am
ORD
- COS
Nonstop2h 59m
American Airlines
Deal found 3/16![American Airlines logo]()
$245
This Southwest deal was found by Cheapflights users on 3/15. 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 4/64:45 pm
COS
- STL
1 stop6h 20m
Southwest
Thu 4/95:40 am
STL
- COS
1 stop8h 55m
Southwest
Deal found 3/15![Southwest logo]()
$246
This Southwest deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” 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 4/217:05 am
COS
- STL
2 stops4h 55m
Southwest
Tue 4/281:45 pm
STL
- COS
2 stops7h 30m
Southwest
Deal found 3/14![Southwest logo]()
$251
This Southwest deal was found by Cheapflights users on 3/15. 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.
Sat 5/99:50 am
COS
- MDW
2 stops9h 15m
Southwest
Sat 5/161:55 pm
MDW
- COS
1 stop7h 50m
Southwest
Deal found 3/15![Southwest logo]()
$252
This Southwest deal was found by Cheapflights users on 3/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/166:15 am
COS
- ORD
1 stop11h 35m
Southwest
Sat 4/182:05 pm
ORD
- COS
2 stops7h 40m
Southwest
Deal found 3/16![Southwest logo]()
$252
Best flights from Colorado Springs to IllinoisDiscover carefully curated flight deals from Colorado Springs to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 17, 2026.
Discover carefully curated flight deals from Colorado Springs to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 17, 2026.
This American Airlines deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/75:13 pm
COS
- STL
1 stop4h 46m
American Airlines
Sat 5/97:05 am
STL
- COS
1 stop5h 47m
American Airlines
Deal found 3/13![American Airlines logo]()
$241
This Southwest deal was found by Cheapflights users on 3/15. 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 5/74:05 pm
COS
- STL
1 stop7h 10m
Southwest
Sat 5/95:50 pm
STL
- COS
1 stop3h 55m
Southwest
Deal found 3/15![Southwest logo]()
$241
This United Airlines deal was found by Cheapflights users on 3/16. 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.
Sat 5/21:25 pm
COS
- ORD
1 stop5h 59m
United Airlines
Tue 5/58:46 am
ORD
- COS
Nonstop3h 01m
United Airlines
Deal found 3/16![United Airlines logo]()
$301
This Delta deal was found by Cheapflights users on 3/15. 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.
Tue 5/191:55 pm
COS
- ORD
1 stop7h 32m
Delta
Wed 5/2711:09 am
ORD
- COS
2 stops11h 18m
Delta
Deal found 3/15![Delta logo]()
$305
This Southwest deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/234:05 pm
COS
- STL
1 stop7h 10m
Southwest
Thu 4/305:45 am
STL
- COS
1 stop5h 15m
Southwest
Deal found 3/12![Southwest logo]()
$241
This Southwest deal was found by Cheapflights users on 3/15. 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.
Wed 4/292:30 pm
COS
- MDW
1 stop4h 50m
Southwest
Wed 5/66:30 am
MDW
- COS
1 stop4h 15m
Southwest
Deal found 3/15![Southwest logo]()
$241
This Southwest deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” 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 4/211:10 pm
COS
- STL
2 stops9h 00m
Southwest
Tue 4/285:40 pm
STL
- COS
1 stop4h 40m
Southwest
Deal found 3/14![Southwest logo]()
$246
This American Airlines deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” 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 4/145:13 pm
COS
- PIA
1 stop5h 00m
American Airlines
Tue 4/215:40 pm
PIA
- COS
1 stop5h 45m
American Airlines
Deal found 3/14![American Airlines logo]()
$309
This Delta deal was found by Cheapflights users on 3/16. 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.
Tue 8/258:00 am
COS
- ORD
1 stop9h 01m
Delta
Sat 8/291:15 pm
ORD
- COS
1 stop9h 00m
Delta
Deal found 3/16![Delta logo]()
$309
This United Airlines deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” 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 4/141:33 pm
COS
- PIA
2 stops8h 24m
United Airlines
Tue 4/215:35 pm
PIA
- COS
1 stop5h 19m
United Airlines
Deal found 3/14![United Airlines logo]()
$334
This Delta deal was found by Cheapflights users on 3/16. 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.
Wed 6/31:55 pm
COS
- MDW
1 stop6h 14m
Delta
Thu 6/41:22 pm
MDW
- COS
2 stops9h 05m
Delta
Deal found 3/16![Delta logo]()
$315
This American Airlines deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” 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 3/274:48 pm
COS
- MLI
1 stop5h 05m
American Airlines
Tue 3/313:31 pm
MLI
- COS
1 stop7h 39m
American Airlines
Deal found 3/12![American Airlines logo]()
$319
This Delta deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” 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 4/18:15 am
COS
- ORD
1 stop8h 50m
Delta
Wed 4/1511:00 am
ORD
- COS
2 stops10h 20m
Delta
Deal found 3/14![Delta logo]()
$315
This Southwest deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” 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.
Sun 4/196:00 pm
COS
- MDW
1 stop5h 50m
Southwest
Mon 4/203:40 pm
MDW
- COS
1 stop9h 10m
Southwest
Deal found 3/12![Southwest logo]()
$289
This American Airlines deal was found by Cheapflights users on 3/15. 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 6/2412:10 pm
COS
- STL
1 stop7h 20m
American Airlines
Tue 6/306:00 am
STL
- COS
1 stop6h 40m
American Airlines
Deal found 3/15![American Airlines logo]()
$333
This United Airlines deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” 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 8/2612:45 pm
COS
- PIA
1 stop5h 40m
United Airlines
Sat 8/295:45 am
PIA
- COS
1 stop6h 14m
United Airlines
Deal found 3/12![United Airlines logo]()
$379
This Southwest deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” 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 4/275:20 pm
COS
- MDW
1 stop5h 20m
Southwest
Fri 5/16:25 pm
MDW
- COS
1 stop6h 25m
Southwest
Deal found 3/12![Southwest logo]()
$289
This Delta deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” 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 4/96:20 am
COS
- MDW
2 stops10h 34m
Delta
Tue 4/141:24 pm
MDW
- COS
2 stops7h 56m
Delta
Deal found 3/12![Delta logo]()
$319
This United Airlines deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/255:45 am
COS
- MLI
1 stop6h 13m
United Airlines
Sat 8/291:33 pm
MLI
- COS
2 stops11h 16m
United Airlines
Deal found 3/12![United Airlines logo]()
$384
This Southwest deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/164:05 pm
COS
- STL
2 stops6h 50m
Southwest
Sun 4/196:15 am
STL
- COS
1 stop4h 05m
Southwest
Deal found 3/13![Southwest logo]()
$292
This Delta deal was found by Cheapflights users on 3/16. 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.
Wed 5/201:55 pm
COS
- MDW
1 stop6h 14m
Delta
Fri 5/296:23 am
MDW
- COS
1 stop7h 25m
Delta
Deal found 3/16![Delta logo]()
$326
This Southwest deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” 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.
Sun 4/196:00 pm
COS
- MDW
1 stop5h 50m
Southwest
Thu 4/2310:05 am
MDW
- COS
2 stops9h 40m
Southwest
Deal found 3/12![Southwest logo]()
$294
This United Airlines deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” 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 3/271:32 pm
COS
- MLI
2 stops8h 04m
United Airlines
Tue 3/318:54 am
MLI
- COS
1 stop4h 42m
United Airlines
Deal found 3/12![United Airlines logo]()
$394
This American Airlines deal was found by Cheapflights users on 3/15. 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.
Fri 8/143:51 pm
COS
- BMI
1 stop5h 56m
American Airlines
Sun 8/164:33 pm
BMI
- COS
1 stop7h 24m
American Airlines
Deal found 3/15![American Airlines logo]()
$423
This Southwest deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” 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 4/275:00 am
COS
- ORD
1 stop9h 30m
Southwest
Fri 5/16:15 pm
ORD
- COS
1 stop5h 00m
Southwest
Deal found 3/12![Southwest logo]()
$294
This United Airlines deal was found by Cheapflights users on 3/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/2512:45 pm
COS
- PIA
1 stop5h 40m
United Airlines
Sat 8/295:45 am
PIA
- COS
1 stop6h 14m
United Airlines
Deal found 3/15![United Airlines logo]()
$399
This Southwest deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/96:15 am
COS
- ORD
1 stop11h 35m
Southwest
Thu 4/168:00 am
ORD
- COS
2 stops15h 15m
Southwest
Deal found 3/12![Southwest logo]()
$305
This American Airlines deal was found by Cheapflights users on 3/16. 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.
Tue 3/3112:29 pm
COS
- SPI
1 stop6h 16m
American Airlines
Sat 4/45:00 am
SPI
- COS
1 stop7h 41m
American Airlines
Deal found 3/16![American Airlines logo]()
$487
This United Airlines deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” 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 8/2612:51 pm
COS
- BMI
2 stops10h 21m
United Airlines
Sat 8/296:00 am
BMI
- COS
1 stop5h 59m
United Airlines
Deal found 3/12![United Airlines logo]()
$447
This Southwest deal was found by Cheapflights users on 3/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/86:15 am
COS
- MDW
1 stop6h 30m
Southwest
Mon 5/116:25 pm
MDW
- COS
1 stop6h 25m
Southwest
Deal found 3/16![Southwest logo]()
$306
Last-minute flights from Colorado Springs to IllinoisDiscover last-minute flight deals from Colorado Springs to Illinois. Data last updated March 17, 2026 and is based on user searches.
Discover last-minute flight deals from Colorado Springs to Illinois. Data last updated March 17, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 3/15. 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 4/64:45 pm
COS
- STL
1 stop6h 20m
Southwest
Thu 4/95:40 am
STL
- COS
1 stop8h 55m
Southwest
Deal found 3/15![Southwest logo]()
$246
This American Airlines deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/95:13 pm
COS
- ORD
1 stop5h 35m
American Airlines
Tue 4/149:53 am
ORD
- COS
Nonstop2h 59m
American Airlines
Deal found 3/13![American Airlines logo]()
$255
This American Airlines deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” 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.
Sat 4/115:13 pm
COS
- STL
1 stop4h 46m
American Airlines
Sat 4/186:11 pm
STL
- COS
1 stop6h 21m
American Airlines
Deal found 3/14![American Airlines logo]()
$241
This Southwest deal was found by Cheapflights users on 3/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/166:15 am
COS
- ORD
1 stop11h 35m
Southwest
Sat 4/182:05 pm
ORD
- COS
2 stops7h 40m
Southwest
Deal found 3/16![Southwest logo]()
$252
This Southwest deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” 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 4/217:05 am
COS
- STL
2 stops4h 55m
Southwest
Tue 4/281:45 pm
STL
- COS
2 stops7h 30m
Southwest
Deal found 3/14![Southwest logo]()
$251
This Southwest deal was found by Cheapflights users on 3/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/296:30 am
COS
- MDW
1 stop7h 55m
Southwest
Sat 5/25:10 am
MDW
- COS
1 stop8h 25m
Southwest
Deal found 3/16![Southwest logo]()
$241
This Southwest deal was found by Cheapflights users on 3/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/296:00 am
COS
- ORD
1 stop6h 55m
Southwest
Sat 5/27:00 am
ORD
- COS
1 stop6h 35m
Southwest
Deal found 3/16![Southwest logo]()
$241
This American Airlines deal was found by Cheapflights users on 3/15. 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 4/2912:22 pm
COS
- ORD
Nonstop2h 47m
American Airlines
Wed 5/69:53 am
ORD
- COS
Nonstop2h 59m
American Airlines
Deal found 3/15![American Airlines logo]()
$242
This American Airlines deal was found by Cheapflights users on 3/16. 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.
Wed 4/2912:22 pm
COS
- ORD
Nonstop2h 47m
American Airlines
Sat 5/29:53 am
ORD
- COS
Nonstop2h 59m
American Airlines
Deal found 3/16![American Airlines logo]()
$245
This Kiwi.com deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/306:46 pm
COS
- ORD
1 stop21h 14m
Multiple Airlines
Sun 5/37:45 am
ORD
- COS
1 stop11h 11m
Multiple Airlines
Deal found 3/12![Multiple Airlines logo]()
$230
This Kiwi.com deal was found by Cheapflights users on 3/16. 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.
Thu 4/306:46 pm
COS
- MDW
1 stop18h 48m
Multiple Airlines
Sun 5/36:20 am
MDW
- COS
1 stop12h 36m
Multiple Airlines
Deal found 3/16![Multiple Airlines logo]()
$239
This Southwest deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/304:05 pm
COS
- MDW
1 stop6h 50m
Southwest
Sun 5/36:55 am
MDW
- COS
1 stop5h 05m
Southwest
Deal found 3/13![Southwest logo]()
$260
One-way flights from Colorado Springs to IllinoisSearch for one-way flight options from Colorado Springs to Illinois. Find affordable one-way fares based on user searches. Data last updated March 17, 2026.
Search for one-way flight options from Colorado Springs to Illinois. Find affordable one-way fares based on user searches. Data last updated March 17, 2026.
This American Airlines deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” 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.
Sat 5/1612:22 pm
COS
- ORD
Nonstop2h 47m
American Airlines
Deal found 3/13![American Airlines logo]()
$111
This Delta deal was found by Cheapflights users on 3/16. 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.
Tue 4/78:15 am
COS
- STL
1 stop7h 52m
Delta
Deal found 3/16![Delta logo]()
$121
This Southwest deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” 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 5/166:20 am
COS
- MDW
1 stop7h 45m
Southwest
Deal found 3/13![Southwest logo]()
$121
This Southwest deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” 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 5/162:15 pm
COS
- ORD
1 stop8h 10m
Southwest
Deal found 3/13![Southwest logo]()
$121
This Southwest deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” 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 5/21:10 pm
COS
- STL
2 stops6h 10m
Southwest
Deal found 3/14![Southwest logo]()
$126
This Delta deal was found by Cheapflights users on 3/16. 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.
Tue 5/121:55 pm
COS
- MDW
1 stop6h 14m
Delta
Deal found 3/16![Delta logo]()
$131
This Delta deal was found by Cheapflights users on 3/16. 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.
Mon 5/111:55 pm
COS
- ORD
1 stop6h 58m
Delta
Deal found 3/16![Delta logo]()
$131
This American Airlines deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” 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 5/1512:22 pm
COS
- ORD
Nonstop2h 47m
American Airlines
Deal found 3/12![American Airlines logo]()
$135
This United Airlines deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” 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 5/1211:43 am
COS
- ORD
Nonstop2h 44m
United Airlines
Deal found 3/13![United Airlines logo]()
$136
This Southwest deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” 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 5/154:05 pm
COS
- MDW
1 stop6h 50m
Southwest
Deal found 3/13![Southwest logo]()
$145
This American Airlines deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” 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.
Mon 4/271:39 pm
COS
- ORD
1 stop8h 06m
American Airlines
Deal found 3/12![American Airlines logo]()
$145
This American Airlines deal was found by Cheapflights users on 3/16. 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.
Mon 5/1112:22 pm
COS
- ORD
Nonstop2h 47m
American Airlines
Deal found 3/16![American Airlines logo]()
$146
Find flight deals from Colorado Springs to Illinois
Keep the following information in mind while searching for Colorado Springs to Illinois flight deals. Data was last updated March 17, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $221 (American Airlines) |
One-way from | $111 (American Airlines) |
Popular in | March |
Cheapest in | August |
Average price | $275 |
Good round-trip deal | $360 or less |
Good one-way deal | $189 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Colorado Springs 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 2,558,603 searches. Data last updated March 17, 2026.
Use the filters below to find and compare flights from Colorado Springs to Illinois that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Colorado SpringsSt. Louis
COS - STL
COSSTL
Colorado Springs
Thu 5/7
5:13 pm-10:59 pm
1 stop4h 46m
Lambert-St Louis
Sat 5/9
7:05 am-11:52 am
1 stop5h 47m
$241
Colorado SpringsSt. Louis
COS - STL
COSSTL
Colorado Springs
Thu 5/7
4:05 pm-12:15 am
1 stop7h 10m
Lambert-St Louis
Sat 5/9
5:50 pm-8:45 pm
1 stop3h 55m
$241
Colorado SpringsSt. Louis
COS - STL
COSSTL
Colorado Springs
Thu 4/23
4:05 pm-12:15 am
1 stop7h 10m
Lambert-St Louis
Thu 4/30
5:45 am-10:00 am
1 stop5h 15m
$241
Colorado SpringsChicago
COS - MDW
COSMDW
Colorado Springs
Wed 4/29
2:30 pm-8:20 pm
1 stop4h 50m
Chicago Midway
Wed 5/6
6:30 am-9:45 am
1 stop4h 15m
$241
Colorado SpringsSt. Louis
COS - STL
COSSTL
Colorado Springs
Tue 4/21
1:10 pm-11:10 pm
2 stops9h 00m
Lambert-St Louis
Tue 4/28
5:40 pm-9:20 pm
1 stop4h 40m
$246
Colorado SpringsChicago
COS - MDW
COSMDW
Colorado Springs
Sun 4/19
6:00 pm-12:50 am
1 stop5h 50m
Chicago Midway
Mon 4/20
3:40 pm-11:50 pm
1 stop9h 10m
$289
Colorado SpringsChicago
COS - MDW
COSMDW
Colorado Springs
Mon 4/27
5:20 pm-11:40 pm
1 stop5h 20m
Chicago Midway
Fri 5/1
6:25 pm-11:50 pm
1 stop6h 25m
$289
Colorado SpringsSt. Louis
COS - STL
COSSTL
Colorado Springs
Thu 4/16
4:05 pm-11:55 pm
2 stops6h 50m
Lambert-St Louis
Sun 4/19
6:15 am-9:20 am
1 stop4h 05m
$292
Colorado SpringsChicago
COS - MDW
COSMDW
Colorado Springs
Sun 4/19
6:00 pm-12:50 am
1 stop5h 50m
Chicago Midway
Thu 4/23
10:05 am-6:45 pm
2 stops9h 40m
$294
Colorado SpringsChicago
COS - ORD
COSORD
Colorado Springs
Mon 4/27
5:00 am-3:30 pm
1 stop9h 30m
Chicago O'Hare Intl
Fri 5/1
6:15 pm-10:15 pm
1 stop5h 00m
$294
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Colorado Springs to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from Colorado Springs with our price prediction graph.
COS-STL
COS-ORD
COS-MDW
COS-PIA
COS-MLI
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Colorado Springs to Illinois
COS-USIL
COS-STL
COS-ORD
COS-MDW
COS-PIA
What is the cheapest month to book a flight from Colorado Springs to Illinois?
Currently, July is the cheapest month in which you can book a flight from Colorado Springs to Illinois (average of $46). Flying from Colorado Springs to Illinois in June is currently the most expensive (average of $140). 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 COS to IL?
Find hourly flight availability from Colorado Springs 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 March 17, 2026.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Colorado Springs to Illinois as you normally would.
Weekly flight availability from Colorado Springs to Illinois
Explore weekly flight availability from Colorado Springs 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 March 17, 2026.
The most flights from COS to USIL are scheduled on a Monday (4 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (2 on average).
How much does it cost to fly round-trip from Colorado Springs to Illinois?
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 March 17, 2026.
Read reviews from past customers who have flown Southwest,United Airlines, andAmerican Airlines from Colorado Springs to Illinois. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Comfort
8.0
Food
7.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Comfort
8.0
Food
7.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Comfort
8.0
Food
7.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Comfort
8.0
Food
7.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Related info for your journey
Find useful and relevant information for your journey from Colorado Springs 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 Colorado Springs 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.
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Find flights from Colorado Springs to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Colorado Springs and Illinois flights
Browse other Colorado Springs and Illinois flight options. Last updated on March 17, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Colorado Springs to Illinois flights
Consider these flights traveling from Colorado Springs to Illinois.
Top 3 airlines flying from Colorado Springs to Illinois
Discover the top 3 airlines that operate flights from Colorado Springs 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 2,558,603 searches. Data last updated March 17, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$166 | Average$442 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$227 | Average$343 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$256 | Average$411 | FlexibilityNo cancel fee | On-time69% |