$136+ 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 8/19. Fares are subject to change and may not be available on all flights or dates of travel.
COS — ORD
May 30 — Jun 61
Round-trip
1 adult, Economy
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Find cheap flights from Colorado Springs to Illinois with Cheapflights
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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 April 30, 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 April 30, 2026.
This Delta deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/255:55 pm
COS
- STL
1 stop5h 41m
Delta
Wed 8/266:30 am
STL
- COS
1 stop4h 32m
Delta
Deal found 4/27![Delta logo]()
$221
This Delta deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/2711:55 am
COS
- STL
1 stop6h 08m
Delta
Tue 6/23:11 pm
STL
- COS
2 stops8h 11m
Delta
Deal found 4/29![Delta logo]()
$226
This American Airlines deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/263:45 pm
COS
- STL
1 stop7h 14m
American Airlines
Tue 6/29:41 am
STL
- COS
1 stop7h 53m
American Airlines
Deal found 4/28![American Airlines logo]()
$275
This Delta deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/256:00 am
COS
- STL
1 stop5h 53m
Delta
Thu 8/276:30 am
STL
- COS
1 stop4h 32m
Delta
Deal found 4/27![Delta logo]()
$277
This American Airlines deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/2512:07 pm
COS
- ORD
Nonstop2h 43m
American Airlines
Sat 8/299:45 am
ORD
- COS
Nonstop2h 51m
American Airlines
Deal found 4/25![American Airlines logo]()
$279
This Delta deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/2811:55 am
COS
- STL
1 stop6h 08m
Delta
Tue 6/23:11 pm
STL
- COS
2 stops8h 11m
Delta
Deal found 4/29![Delta logo]()
$280
This United Airlines deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/205:12 pm
COS
- ORD
1 stop5h 44m
United Airlines
Wed 5/279:06 am
ORD
- COS
Nonstop3h 04m
United Airlines
Deal found 4/25![United Airlines logo]()
$281
This Delta deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/2610:57 am
COS
- STL
2 stops8h 34m
Delta
Sun 8/306:30 am
STL
- COS
1 stop4h 32m
Delta
Deal found 4/27![Delta logo]()
$282
This Delta deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/2510:57 am
COS
- STL
2 stops11h 40m
Delta
Sat 8/293:50 pm
STL
- COS
2 stops7h 39m
Delta
Deal found 4/27![Delta logo]()
$287
This American Airlines deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/191:39 pm
COS
- ORD
1 stop7h 41m
American Airlines
Wed 5/275:00 am
ORD
- COS
1 stop5h 54m
American Airlines
Deal found 4/28![American Airlines logo]()
$291
This United Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/3012:16 pm
COS
- ORD
Nonstop2h 46m
United Airlines
Tue 6/29:06 am
ORD
- COS
Nonstop3h 04m
United Airlines
Deal found 4/29![United Airlines logo]()
$295
This American Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/263:45 pm
COS
- ORD
1 stop7h 57m
American Airlines
Sat 5/308:19 am
ORD
- COS
1 stop7h 28m
American Airlines
Deal found 4/29![American Airlines logo]()
$301
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 April 30, 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 April 30, 2026.
This Southwest deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/176:10 pm
COS
- STL
1 stop4h 30m
Southwest
Sun 6/217:35 pm
STL
- COS
1 stop6h 10m
Southwest
Deal found 4/29![Southwest logo]()
$277
This United Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/33:42 pm
COS
- ORD
1 stop6h 07m
United Airlines
Sat 6/69:06 am
ORD
- COS
Nonstop3h 04m
United Airlines
Deal found 4/29![United Airlines logo]()
$291
This Delta deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/31:55 pm
COS
- ORD
1 stop6h 58m
Delta
Sat 6/61:44 pm
ORD
- COS
2 stops9h 38m
Delta
Deal found 4/29![Delta logo]()
$306
This American Airlines deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/18:00 am
COS
- PIA
1 stop6h 53m
American Airlines
Sun 9/64:43 pm
PIA
- COS
1 stop7h 10m
American Airlines
Deal found 4/26![American Airlines logo]()
$329
This Southwest deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/39:10 am
COS
- STL
2 stops7h 45m
Southwest
Sun 6/77:35 pm
STL
- COS
1 stop6h 10m
Southwest
Deal found 4/27![Southwest logo]()
$311
This United Airlines deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/15:45 am
COS
- PIA
1 stop5h 59m
United Airlines
Sun 9/65:45 am
PIA
- COS
1 stop6h 14m
United Airlines
Deal found 4/25![United Airlines logo]()
$329
This Delta deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/225:55 pm
COS
- STL
1 stop5h 41m
Delta
Sun 8/307:20 am
STL
- COS
1 stop6h 28m
Delta
Deal found 4/27![Delta logo]()
$333
This United Airlines deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/236:30 pm
COS
- STL
1 stop4h 27m
United Airlines
Sat 5/305:10 am
STL
- COS
1 stop4h 31m
United Airlines
Deal found 4/25![United Airlines logo]()
$329
This Southwest deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/124:40 pm
COS
- STL
1 stop6h 55m
Southwest
Sat 6/134:55 pm
STL
- COS
1 stop7h 35m
Southwest
Deal found 4/26![Southwest logo]()
$333
This Delta deal was found by Cheapflights users on 4/25. 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.
Mon 6/156:20 pm
COS
- STL
1 stop5h 23m
Delta
Fri 6/193:57 pm
STL
- COS
1 stop6h 10m
Delta
Deal found 4/25![Delta logo]()
$333
This American Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/2212:10 pm
COS
- MLI
1 stop5h 16m
American Airlines
Wed 5/274:46 pm
MLI
- COS
1 stop6h 39m
American Airlines
Deal found 4/29![American Airlines logo]()
$397
This United Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/16:32 pm
COS
- STL
1 stop4h 18m
United Airlines
Wed 9/26:00 am
STL
- COS
1 stop5h 59m
United Airlines
Deal found 4/29![United Airlines logo]()
$330
This Southwest deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/164:35 pm
COS
- STL
1 stop7h 00m
Southwest
Sun 7/197:35 pm
STL
- COS
1 stop6h 10m
Southwest
Deal found 4/29![Southwest logo]()
$333
This Delta deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/2510:57 am
COS
- ORD
2 stops12h 00m
Delta
Fri 8/281:15 pm
ORD
- COS
1 stop9h 00m
Delta
Deal found 4/29![Delta logo]()
$336
This United Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/412:16 pm
COS
- ORD
Nonstop2h 46m
United Airlines
Fri 6/55:00 am
ORD
- COS
1 stop4h 41m
United Airlines
Deal found 4/29![United Airlines logo]()
$331
This Southwest deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/34:45 pm
COS
- MDW
1 stop11h 15m
Southwest
Sat 6/64:35 pm
MDW
- COS
1 stop7h 55m
Southwest
Deal found 4/29![Southwest logo]()
$336
This Delta deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/2510:57 am
COS
- MDW
2 stops9h 49m
Delta
Sat 8/299:20 am
MDW
- COS
2 stops8h 54m
Delta
Deal found 4/29![Delta logo]()
$342
This American Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/145:13 pm
COS
- PIA
1 stop5h 00m
American Airlines
Mon 5/185:40 pm
PIA
- COS
1 stop6h 52m
American Airlines
Deal found 4/29![American Airlines logo]()
$414
This Southwest deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/285:30 am
COS
- ORD
1 stop7h 25m
Southwest
Sun 5/314:50 pm
ORD
- COS
1 stop8h 40m
Southwest
Deal found 4/25![Southwest logo]()
$341
This Delta deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/48:15 am
COS
- ORD
2 stops12h 38m
Delta
Fri 6/57:07 am
ORD
- COS
1 stop6h 41m
Delta
Deal found 4/29![Delta logo]()
$346
This United Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1112:45 pm
COS
- ORD
Nonstop2h 44m
United Airlines
Wed 8/129:06 am
ORD
- COS
Nonstop2h 53m
United Airlines
Deal found 4/29![United Airlines logo]()
$351
This Southwest deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/34:45 pm
COS
- MDW
1 stop11h 15m
Southwest
Fri 6/52:05 pm
MDW
- COS
2 stops7h 10m
Southwest
Deal found 4/29![Southwest logo]()
$342
This United Airlines deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/1612:16 pm
COS
- ORD
Nonstop2h 46m
United Airlines
Tue 7/219:06 am
ORD
- COS
Nonstop3h 03m
United Airlines
Deal found 4/25![United Airlines logo]()
$351
This Delta deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/2610:57 am
COS
- EVV
2 stops10h 06m
Delta
Sat 8/296:00 am
EVV
- COS
1 stop7h 48m
Delta
Deal found 4/27![Delta logo]()
$372
This Southwest deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/1612:20 pm
COS
- MDW
1 stop10h 05m
Southwest
Tue 7/214:05 pm
MDW
- COS
Nonstop2h 30m
Southwest
Deal found 4/25![Southwest logo]()
$361
This Delta deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/2810:57 am
COS
- MDW
2 stops9h 49m
Delta
Sun 8/309:20 am
MDW
- COS
2 stops8h 54m
Delta
Deal found 4/28![Delta logo]()
$382
This American Airlines deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/283:45 pm
COS
- PIA
1 stop6h 53m
American Airlines
Thu 6/49:53 am
PIA
- COS
2 stops13h 31m
American Airlines
Deal found 4/28![American Airlines logo]()
$566
This Southwest deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/243:00 pm
COS
- MDW
2 stops5h 55m
Southwest
Sat 8/2910:10 am
MDW
- COS
Nonstop2h 30m
Southwest
Deal found 4/25![Southwest logo]()
$366
This United Airlines deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/123:25 pm
COS
- PIA
1 stop4h 54m
United Airlines
Sat 5/166:30 am
PIA
- COS
1 stop5h 17m
United Airlines
Deal found 4/26![United Airlines logo]()
$419
This American Airlines deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/121:39 pm
COS
- SPI
2 stops9h 04m
American Airlines
Sat 5/165:45 am
SPI
- COS
1 stop7h 07m
American Airlines
Deal found 4/26![American Airlines logo]()
$578
Last-minute flights from Colorado Springs to IllinoisDiscover last-minute flight deals from Colorado Springs to Illinois. Data last updated April 30, 2026 and is based on user searches.
Discover last-minute flight deals from Colorado Springs to Illinois. Data last updated April 30, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/191:39 pm
COS
- ORD
1 stop7h 41m
American Airlines
Wed 5/275:00 am
ORD
- COS
1 stop5h 54m
American Airlines
Deal found 4/28![American Airlines logo]()
$291
This United Airlines deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/205:12 pm
COS
- ORD
1 stop5h 44m
United Airlines
Wed 5/279:06 am
ORD
- COS
Nonstop3h 04m
United Airlines
Deal found 4/25![United Airlines logo]()
$281
This American Airlines deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/205:13 pm
COS
- ORD
1 stop5h 35m
American Airlines
Sun 5/249:40 am
ORD
- COS
Nonstop3h 00m
American Airlines
Deal found 4/26![American Airlines logo]()
$321
This United Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/233:42 pm
COS
- ORD
1 stop4h 57m
United Airlines
Mon 5/255:00 am
ORD
- COS
1 stop4h 41m
United Airlines
Deal found 4/29![United Airlines logo]()
$311
This American Airlines deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/263:45 pm
COS
- STL
1 stop7h 14m
American Airlines
Tue 6/29:41 am
STL
- COS
1 stop7h 53m
American Airlines
Deal found 4/28![American Airlines logo]()
$275
This American Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/263:45 pm
COS
- ORD
1 stop7h 57m
American Airlines
Sat 5/308:19 am
ORD
- COS
1 stop7h 28m
American Airlines
Deal found 4/29![American Airlines logo]()
$301
This American Airlines deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/263:45 pm
COS
- ORD
1 stop14h 47m
American Airlines
Wed 5/279:40 am
ORD
- COS
Nonstop3h 00m
American Airlines
Deal found 4/26![American Airlines logo]()
$319
This Delta deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/2711:55 am
COS
- STL
1 stop6h 08m
Delta
Tue 6/23:11 pm
STL
- COS
2 stops8h 11m
Delta
Deal found 4/29![Delta logo]()
$226
This Delta deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/2811:55 am
COS
- STL
1 stop6h 08m
Delta
Tue 6/23:11 pm
STL
- COS
2 stops8h 11m
Delta
Deal found 4/29![Delta logo]()
$280
This Southwest deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/285:30 am
COS
- ORD
1 stop12h 05m
Southwest
Mon 6/14:50 pm
ORD
- COS
1 stop8h 00m
Southwest
Deal found 4/27![Southwest logo]()
$316
This United Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/3012:16 pm
COS
- ORD
Nonstop2h 46m
United Airlines
Tue 6/29:06 am
ORD
- COS
Nonstop3h 04m
United Airlines
Deal found 4/29![United Airlines logo]()
$295
This United Airlines deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/309:00 am
COS
- ORD
Nonstop3h 03m
United Airlines
Mon 6/19:06 am
ORD
- COS
Nonstop3h 04m
United Airlines
Deal found 4/28![United Airlines logo]()
$317
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 April 30, 2026.
Search for one-way flight options from Colorado Springs to Illinois. Find affordable one-way fares based on user searches. Data last updated April 30, 2026.
This Southwest deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/191:15 pm
COS
- MDW
Nonstop2h 20m
Southwest
Deal found 4/29![Southwest logo]()
$136
This American Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/1912:36 pm
COS
- ORD
Nonstop2h 54m
American Airlines
Deal found 4/29![American Airlines logo]()
$136
This Delta deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/176:00 am
COS
- ORD
1 stop7h 16m
Delta
Deal found 4/28![Delta logo]()
$146
This Delta deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/196:00 am
COS
- MDW
2 stops11h 31m
Delta
Deal found 4/29![Delta logo]()
$151
This Southwest deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2210:40 am
COS
- MDW
Nonstop2h 20m
Southwest
Deal found 4/26![Southwest logo]()
$152
This American Airlines deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/183:45 pm
COS
- ORD
1 stop7h 46m
American Airlines
Deal found 4/25![American Airlines logo]()
$154
This American Airlines deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/233:45 pm
COS
- ORD
1 stop6h 52m
American Airlines
Deal found 4/25![American Airlines logo]()
$156
This Delta deal was found by Cheapflights users on 4/25. 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.
Sat 5/168:15 am
COS
- ORD
2 stops12h 05m
Delta
Deal found 4/25![Delta logo]()
$161
This Delta deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/2111:55 am
COS
- STL
1 stop6h 08m
Delta
Deal found 4/27![Delta logo]()
$165
This KAYAK deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK 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
Deal found 4/28![Delta logo]()
$166
This KAYAK deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/31:55 pm
COS
- ORD
1 stop6h 58m
Delta
Deal found 4/28![Delta logo]()
$166
This American Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/83:45 pm
COS
- STL
1 stop7h 13m
American Airlines
Deal found 4/29![American Airlines logo]()
$167
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 April 30, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $221 (Delta) |
One-way from | $136 (Southwest) |
Popular in | November |
Cheapest in | January |
Average price | $370 |
Good round-trip deal | $361 or less |
Good one-way deal | $215 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 April 30, 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
Wed 6/17
6:10 pm-11:40 pm
1 stop4h 30m
Lambert-St Louis
Sun 6/21
7:35 pm-12:45 am
1 stop6h 10m
$277
Colorado SpringsChicago
COS - ORD
COSORD
Colorado Springs
Wed 6/3
3:42 pm-10:49 pm
1 stop6h 07m
Chicago O'Hare Intl
Sat 6/6
9:06 am-11:10 am
Nonstop3h 04m
$291
Colorado SpringsChicago
COS - ORD
COSORD
Colorado Springs
Wed 6/3
1:55 pm-9:53 pm
1 stop6h 58m
Chicago O'Hare Intl
Sat 6/6
1:44 pm-10:22 pm
2 stops9h 38m
$306
Colorado SpringsSt. Louis
COS - STL
COSSTL
Colorado Springs
Wed 6/3
9:10 am-5:55 pm
2 stops7h 45m
Lambert-St Louis
Sun 6/7
7:35 pm-12:45 am
1 stop6h 10m
$311
Colorado SpringsPeoria
COS - PIA
COSPIA
Colorado Springs
Tue 9/1
8:00 am-3:53 pm
1 stop6h 53m
Greater Peoria
Sun 9/6
4:43 pm-10:53 pm
1 stop7h 10m
$329
Colorado SpringsPeoria
COS - PIA
COSPIA
Colorado Springs
Tue 9/1
5:45 am-12:44 pm
1 stop5h 59m
Greater Peoria
Sun 9/6
5:45 am-10:59 am
1 stop6h 14m
$329
Colorado SpringsSt. Louis
COS - STL
COSSTL
Colorado Springs
Sat 5/23
6:30 pm-11:57 pm
1 stop4h 27m
Lambert-St Louis
Sat 5/30
5:10 am-8:41 am
1 stop4h 31m
$329
Colorado SpringsSt. Louis
COS - STL
COSSTL
Colorado Springs
Tue 9/1
6:32 pm-11:50 pm
1 stop4h 18m
Lambert-St Louis
Wed 9/2
6:00 am-10:59 am
1 stop5h 59m
$330
Colorado SpringsChicago
COS - ORD
COSORD
Colorado Springs
Thu 6/4
12:16 pm-4:02 pm
Nonstop2h 46m
Chicago O'Hare Intl
Fri 6/5
5:00 am-8:41 am
1 stop4h 41m
$331
Colorado SpringsSt. Louis
COS - STL
COSSTL
Colorado Springs
Sat 8/22
5:55 pm-12:36 am
1 stop5h 41m
Lambert-St Louis
Sun 8/30
7:20 am-12:48 pm
1 stop6h 28m
$333
Showing 1-10 of 57 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
How far ahead should I book a flight from Colorado Springs to Illinois?
The price you pay for your flight from Colorado Springs to Illinois may vary depending on when you book. For the best chance of a lower fare, look to book 62 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
What is the cheapest month to book a flight from Colorado Springs to Illinois?
Currently, October is the cheapest month in which you can book a flight from Colorado Springs to Illinois (average of $149). Flying from Colorado Springs to Illinois in November is currently the most expensive (average of $283). 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 April 30, 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 April 30, 2026.
The most flights from COS to USIL are scheduled on a Monday (3 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 April 30, 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.
Boarding
8.1
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Boarding
8.1
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Boarding
8.1
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Boarding
8.1
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
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 April 30, 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 April 30, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$227 | Average$371 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$228 | Average$453 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$229 | Average$397 | FlexibilityNo cancel fee | On-time69% |