$122+ 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 8/25. Fares are subject to change and may not be available on all flights or dates of travel.
COS — ORD
Aug 29 — Sep 51
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 Juli 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 Juli 30, 2026.
This Southwest deal was found by Cheapflights users on 7/29. 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.
Mo 8/241:15 pm
COS
- MDW
Nonstop2h 20m
Southwest
Mi 8/263:35 pm
MDW
- COS
Nonstop2h 25m
Southwest
Deal found 7/29![Southwest logo]()
$243
This American Airlines deal was found by Cheapflights users on 7/25. 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.
Mo 9/145:01 am
COS
- ORD
Nonstop2h 49m
American Airlines
Mi 9/2310:55 am
ORD
- COS
Nonstop2h 53m
American Airlines
Deal found 7/25![American Airlines logo]()
$243
This Southwest deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Di 10/2712:40 pm
COS
- MDW
Nonstop2h 20m
Southwest
Fr 10/3011:50 am
MDW
- COS
Nonstop2h 35m
Southwest
Deal found 7/28![Southwest logo]()
$248
This American Airlines deal was found by Cheapflights users on 7/28. 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.
Sa 8/2912:36 pm
COS
- ORD
Nonstop2h 53m
American Airlines
So 9/611:00 am
ORD
- COS
Nonstop2h 51m
American Airlines
Deal found 7/28![American Airlines logo]()
$248
This Southwest deal was found by Cheapflights users on 7/27. 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.
Di 8/256:15 am
COS
- MDW
1 stop4h 45m
Southwest
Di 9/13:35 pm
MDW
- COS
Nonstop2h 25m
Southwest
Deal found 7/27![Southwest logo]()
$249
This American Airlines deal was found by Cheapflights users on 7/26. 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.
Di 8/2512:37 pm
COS
- ORD
Nonstop2h 53m
American Airlines
Di 9/15:00 am
ORD
- COS
1 stop5h 18m
American Airlines
Deal found 7/26![American Airlines logo]()
$253
This Delta deal was found by Cheapflights users on 7/29. 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.
Mi 8/1911:27 am
COS
- MDW
1 stop5h 34m
Delta
Di 8/256:05 am
MDW
- COS
1 stop7h 10m
Delta
Deal found 7/29![Delta logo]()
$263
This American Airlines deal was found by Cheapflights users on 7/26. 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.
Di 8/251:17 pm
COS
- ORD
1 stop6h 59m
American Airlines
Di 9/85:00 am
ORD
- COS
1 stop5h 18m
American Airlines
Deal found 7/26![American Airlines logo]()
$263
This Delta deal was found by Cheapflights users on 7/29. 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.
Fr 12/251:40 pm
COS
- MDW
1 stop7h 30m
Delta
Mi 1/66:00 am
MDW
- COS
1 stop7h 58m
Delta
Deal found 7/29![Delta logo]()
$268
This Delta deal was found by Cheapflights users on 7/28. 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.
Di 8/258:10 am
COS
- ORD
1 stop9h 09m
Delta
Sa 8/2911:22 am
ORD
- COS
2 stops11h 16m
Delta
Deal found 7/28![Delta logo]()
$268
This United Airlines deal was found by Cheapflights users on 7/26. 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.
Sa 10/1711:57 am
COS
- ORD
Nonstop2h 45m
United Airlines
Do 10/225:00 am
ORD
- COS
1 stop4h 40m
United Airlines
Deal found 7/26![United Airlines logo]()
$271
This Delta deal was found by Cheapflights users on 7/29. 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.
Di 8/256:00 am
COS
- MDW
2 stops11h 33m
Delta
Sa 8/291:25 pm
MDW
- COS
2 stops9h 13m
Delta
Deal found 7/29![Delta logo]()
$273
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 Juli 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 Juli 30, 2026.
This United Airlines deal was found by Cheapflights users on 7/29. 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.
Mi 8/2611:55 am
COS
- ORD
Nonstop2h 43m
United Airlines
Di 9/17:45 pm
ORD
- COS
Nonstop3h 09m
United Airlines
Deal found 7/29![United Airlines logo]()
$243
This American Airlines deal was found by Cheapflights users on 7/25. 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.
Sa 9/1212:37 pm
COS
- ORD
Nonstop2h 53m
American Airlines
Sa 9/1910:55 am
ORD
- COS
Nonstop2h 53m
American Airlines
Deal found 7/25![American Airlines logo]()
$243
This Delta deal was found by Cheapflights users on 7/29. 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.
Mi 8/191:20 pm
COS
- ORD
1 stop6h 35m
Delta
Sa 8/221:50 pm
ORD
- COS
1 stop8h 48m
Delta
Deal found 7/29![Delta logo]()
$263
This Southwest deal was found by Cheapflights users on 7/29. 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.
Do 9/35:30 am
COS
- STL
1 stop7h 10m
Southwest
Mo 9/76:25 am
STL
- COS
1 stop4h 20m
Southwest
Deal found 7/29![Southwest logo]()
$333
This United Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sa 8/295:01 pm
COS
- ORD
1 stop4h 45m
United Airlines
Mo 8/317:45 pm
ORD
- COS
Nonstop3h 09m
United Airlines
Deal found 7/30![United Airlines logo]()
$253
This Delta deal was found by Cheapflights users on 7/28. 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.
Di 8/181:20 pm
COS
- MDW
1 stop8h 16m
Delta
Di 8/259:59 am
MDW
- COS
2 stops8h 37m
Delta
Deal found 7/28![Delta logo]()
$268
This Delta deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Di 8/258:10 am
COS
- ORD
1 stop9h 09m
Delta
Di 9/111:22 am
ORD
- COS
2 stops11h 16m
Delta
Deal found 7/26![Delta logo]()
$268
This American Airlines deal was found by Cheapflights users on 7/28. 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.
Di 10/63:58 pm
COS
- MLI
1 stop6h 19m
American Airlines
Sa 10/1011:21 am
MLI
- COS
2 stops12h 38m
American Airlines
Deal found 7/28![American Airlines logo]()
$324
This United Airlines deal was found by Cheapflights users on 7/28. 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.
Mi 8/2611:55 am
COS
- ORD
Nonstop2h 43m
United Airlines
Mo 8/317:45 pm
ORD
- COS
Nonstop3h 09m
United Airlines
Deal found 7/28![United Airlines logo]()
$323
This Southwest deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fr 8/281:30 pm
COS
- MDW
2 stops9h 15m
Southwest
So 8/306:10 am
MDW
- COS
1 stop5h 10m
Southwest
Deal found 7/28![Southwest logo]()
$361
This American Airlines deal was found by Cheapflights users on 7/29. 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.
Mo 8/173:51 pm
COS
- PIA
1 stop6h 28m
American Airlines
Mo 8/244:43 pm
PIA
- COS
1 stop7h 10m
American Airlines
Deal found 7/29![American Airlines logo]()
$334
This United Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mi 9/231:03 pm
COS
- MLI
2 stops6h 57m
United Airlines
Di 9/296:32 am
MLI
- COS
1 stop5h 23m
United Airlines
Deal found 7/30![United Airlines logo]()
$324
This Southwest deal was found by Cheapflights users on 7/29. 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.
Fr 9/41:15 pm
COS
- STL
1 stop4h 50m
Southwest
Di 9/82:45 pm
STL
- COS
1 stop6h 30m
Southwest
Deal found 7/29![Southwest logo]()
$362
This American Airlines deal was found by Cheapflights users on 7/27. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Di 8/113:51 pm
COS
- PIA
1 stop6h 28m
American Airlines
Sa 8/154:43 pm
PIA
- COS
1 stop7h 10m
American Airlines
Deal found 7/27![American Airlines logo]()
$349
This Delta deal was found by Cheapflights users on 7/25. 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.
Fr 10/308:17 am
COS
- STL
1 stop8h 27m
Delta
Sa 10/317:00 am
STL
- COS
2 stops11h 32m
Delta
Deal found 7/25![Delta logo]()
$353
This Southwest deal was found by Cheapflights users on 7/26. 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.
Sa 8/156:20 am
COS
- MDW
1 stop6h 55m
Southwest
Mo 8/175:30 am
MDW
- COS
1 stop8h 05m
Southwest
Deal found 7/26![Southwest logo]()
$363
This American Airlines deal was found by Cheapflights users on 7/26. 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.
Di 8/113:51 pm
COS
- MLI
1 stop5h 20m
American Airlines
Sa 8/154:32 pm
MLI
- COS
1 stop7h 21m
American Airlines
Deal found 7/26![American Airlines logo]()
$349
This United Airlines deal was found by Cheapflights users on 7/26. 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.
Fr 10/165:08 pm
COS
- ORD
1 stop4h 38m
United Airlines
So 10/185:00 am
ORD
- COS
1 stop4h 40m
United Airlines
Deal found 7/26![United Airlines logo]()
$356
This Southwest deal was found by Cheapflights users on 7/27. 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.
Fr 10/94:20 pm
COS
- STL
1 stop5h 25m
Southwest
Mo 10/126:20 pm
STL
- COS
1 stop6h 50m
Southwest
Deal found 7/27![Southwest logo]()
$365
This Delta deal was found by Cheapflights users on 7/25. 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.
So 8/166:00 am
COS
- STL
1 stop7h 33m
Delta
Mo 8/243:39 pm
STL
- COS
1 stop6h 59m
Delta
Deal found 7/25![Delta logo]()
$385
This United Airlines deal was found by Cheapflights users on 7/28. 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.
Mi 8/1911:55 am
COS
- ORD
Nonstop2h 43m
United Airlines
Mo 8/248:46 am
ORD
- COS
Nonstop2h 47m
United Airlines
Deal found 7/28![United Airlines logo]()
$357
This American Airlines deal was found by Cheapflights users on 7/28. 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.
Di 9/2910:17 am
COS
- MLI
2 stops12h 48m
American Airlines
Sa 10/36:00 am
MLI
- COS
2 stops9h 39m
American Airlines
Deal found 7/28![American Airlines logo]()
$363
This Southwest deal was found by Cheapflights users on 7/29. 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.
Do 8/2710:25 am
COS
- STL
1 stop6h 40m
Southwest
Do 9/35:55 am
STL
- COS
1 stop7h 50m
Southwest
Deal found 7/29![Southwest logo]()
$365
This Delta deal was found by Cheapflights users on 7/27. 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.
Mo 10/126:07 pm
COS
- ORD
2 stops14h 18m
Delta
Mi 10/142:03 pm
ORD
- COS
1 stop9h 19m
Delta
Deal found 7/27![Delta logo]()
$400
This American Airlines deal was found by Cheapflights users on 7/26. 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.
Fr 9/113:54 pm
COS
- STL
1 stop6h 49m
American Airlines
So 9/135:43 am
STL
- COS
1 stop4h 39m
American Airlines
Deal found 7/26![American Airlines logo]()
$370
This Southwest deal was found by Cheapflights users on 7/27. 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.
Do 10/85:00 am
COS
- STL
1 stop6h 45m
Southwest
So 10/118:30 am
STL
- COS
2 stops6h 40m
Southwest
Deal found 7/27![Southwest logo]()
$370
This United Airlines deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Di 11/31:28 pm
COS
- MLI
2 stops8h 31m
United Airlines
Sa 11/73:39 pm
MLI
- COS
1 stop7h 18m
United Airlines
Deal found 7/27![United Airlines logo]()
$404
This Southwest deal was found by Cheapflights users on 7/25. 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.
Mo 8/1011:20 am
COS
- MDW
2 stops7h 25m
Southwest
Sa 9/52:25 pm
MDW
- COS
2 stops7h 15m
Southwest
Deal found 7/25![Southwest logo]()
$373
This Delta deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Do 9/241:25 pm
COS
- MLI
1 stop8h 05m
Delta
So 9/276:00 am
MLI
- COS
1 stop7h 14m
Delta
Deal found 7/26![Delta logo]()
$425
This United Airlines deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sa 10/3111:34 am
COS
- PIA
2 stops10h 24m
United Airlines
Di 11/310:43 am
PIA
- COS
2 stops11h 06m
United Airlines
Deal found 7/27![United Airlines logo]()
$409
Last-minute flights from Colorado Springs to IllinoisDiscover last-minute flight deals from Colorado Springs to Illinois. Data last updated Juli 30, 2026 and is based on user searches.
Discover last-minute flight deals from Colorado Springs to Illinois. Data last updated Juli 30, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 7/27. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Di 8/113:51 pm
COS
- PIA
1 stop6h 28m
American Airlines
Sa 8/154:43 pm
PIA
- COS
1 stop7h 10m
American Airlines
Deal found 7/27![American Airlines logo]()
$349
This American Airlines deal was found by Cheapflights users on 7/26. 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.
Di 8/113:51 pm
COS
- MLI
1 stop5h 20m
American Airlines
Sa 8/154:32 pm
MLI
- COS
1 stop7h 21m
American Airlines
Deal found 7/26![American Airlines logo]()
$349
This American Airlines deal was found by Cheapflights users on 7/27. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mo 8/173:51 pm
COS
- PIA
1 stop6h 28m
American Airlines
Mo 8/244:43 pm
PIA
- COS
1 stop7h 10m
American Airlines
Deal found 7/27![American Airlines logo]()
$334
This Delta deal was found by Cheapflights users on 7/28. 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.
Di 8/181:20 pm
COS
- MDW
1 stop8h 16m
Delta
Di 8/259:59 am
MDW
- COS
2 stops8h 37m
Delta
Deal found 7/28![Delta logo]()
$268
This Delta deal was found by Cheapflights users on 7/29. 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.
Mi 8/1911:27 am
COS
- MDW
1 stop5h 34m
Delta
Di 8/256:05 am
MDW
- COS
1 stop7h 10m
Delta
Deal found 7/29![Delta logo]()
$263
This Southwest deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Do 8/204:20 pm
COS
- STL
1 stop5h 50m
Southwest
Mi 8/268:35 am
STL
- COS
1 stop5h 05m
Southwest
Deal found 7/30![Southwest logo]()
$333
This Southwest deal was found by Cheapflights users on 7/29. 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.
Fr 8/211:15 pm
COS
- MDW
Nonstop2h 20m
Southwest
Mo 8/245:30 am
MDW
- COS
1 stop8h 05m
Southwest
Deal found 7/29![Southwest logo]()
$287
This Southwest deal was found by Cheapflights users on 7/29. 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.
Mo 8/241:15 pm
COS
- MDW
Nonstop2h 20m
Southwest
Mi 8/263:35 pm
MDW
- COS
Nonstop2h 25m
Southwest
Deal found 7/29![Southwest logo]()
$243
This Delta deal was found by Cheapflights users on 7/28. 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.
Mo 8/2411:27 am
COS
- MDW
1 stop5h 34m
Delta
Di 8/256:05 am
MDW
- COS
1 stop7h 10m
Delta
Deal found 7/28![Delta logo]()
$297
This Southwest deal was found by Cheapflights users on 7/27. 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.
Di 8/256:15 am
COS
- MDW
1 stop4h 45m
Southwest
Di 9/13:35 pm
MDW
- COS
Nonstop2h 25m
Southwest
Deal found 7/27![Southwest logo]()
$249
This Delta deal was found by Cheapflights users on 7/29. 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.
Di 8/256:00 am
COS
- MDW
2 stops11h 33m
Delta
Sa 8/291:25 pm
MDW
- COS
2 stops9h 13m
Delta
Deal found 7/29![Delta logo]()
$273
This Delta deal was found by Cheapflights users on 7/29. 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.
Di 8/251:20 pm
COS
- MDW
1 stop8h 16m
Delta
Fr 8/281:25 pm
MDW
- COS
2 stops9h 13m
Delta
Deal found 7/29![Delta logo]()
$302
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 Juli 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 Juli 30, 2026.
This Southwest deal was found by Cheapflights users on 7/27. 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.
Di 8/251:15 pm
COS
- MDW
Nonstop2h 20m
Southwest
Deal found 7/27![Southwest logo]()
$122
This United Airlines deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Di 8/2511:55 am
COS
- ORD
Nonstop2h 43m
United Airlines
Deal found 7/27![United Airlines logo]()
$122
This Delta deal was found by Cheapflights users on 7/29. 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.
Mi 8/261:20 pm
COS
- MDW
1 stop8h 16m
Delta
Deal found 7/29![Delta logo]()
$132
This Delta deal was found by Cheapflights users on 7/29. 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.
Do 8/278:10 am
COS
- ORD
1 stop9h 09m
Delta
Deal found 7/29![Delta logo]()
$132
This Delta deal was found by Cheapflights users on 7/29. 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.
Di 8/256:00 am
COS
- MDW
2 stops11h 33m
Delta
Deal found 7/29![Delta logo]()
$137
This Delta deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mi 10/286:07 pm
COS
- ORD
2 stops14h 18m
Delta
Deal found 7/30![Delta logo]()
$137
This Delta deal was found by Cheapflights users on 7/25. 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.
Do 10/226:00 am
COS
- ORD
2 stops11h 29m
Delta
Deal found 7/25![Delta logo]()
$142
This Southwest deal was found by Cheapflights users on 7/29. 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.
Fr 8/281:15 pm
COS
- MDW
Nonstop2h 20m
Southwest
Deal found 7/29![Southwest logo]()
$156
This United Airlines deal was found by Cheapflights users on 7/29. 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.
Fr 8/287:55 am
COS
- ORD
Nonstop3h 04m
United Airlines
Deal found 7/29![United Airlines logo]()
$156
This American Airlines deal was found by Cheapflights users on 7/26. 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.
Di 10/2712:46 pm
COS
- ORD
Nonstop2h 45m
American Airlines
Deal found 7/26![American Airlines logo]()
$162
This Delta deal was found by Cheapflights users on 7/29. 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.
Fr 8/288:10 am
COS
- ORD
1 stop9h 09m
Delta
Deal found 7/29![Delta logo]()
$166
This Southwest deal was found by Cheapflights users on 7/29. 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.
Do 9/34:20 pm
COS
- STL
1 stop5h 55m
Southwest
Deal found 7/29![Southwest 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 Juli 30, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $243 (Southwest) |
One-way from | $122 (Southwest) |
Popular in | July |
Cheapest in | January |
Average price | $440 |
Good round-trip deal | $361 or less |
Good one-way deal | $216 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 Juli 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 SpringsChicago
COS - ORD
COSORD
Colorado Springs
Mi 8/26
11:55 am-3:38 pm
Nonstop2h 43m
Chicago O'Hare Intl
Di 9/1
7:45 pm-9:54 pm
Nonstop3h 09m
$243
Colorado SpringsChicago
COS - ORD
COSORD
Colorado Springs
Sa 9/12
12:37 pm-4:30 pm
Nonstop2h 53m
Chicago O'Hare Intl
Sa 9/19
10:55 am-12:48 pm
Nonstop2h 53m
$243
Colorado SpringsChicago
COS - ORD
COSORD
Colorado Springs
Sa 8/29
5:01 pm-10:46 pm
1 stop4h 45m
Chicago O'Hare Intl
Mo 8/31
7:45 pm-9:54 pm
Nonstop3h 09m
$253
Colorado SpringsChicago
COS - ORD
COSORD
Colorado Springs
Mi 8/19
1:20 pm-8:55 pm
1 stop6h 35m
Chicago O'Hare Intl
Sa 8/22
1:50 pm-9:38 pm
1 stop8h 48m
$263
Colorado SpringsChicago
COS - MDW
COSMDW
Colorado Springs
Di 8/18
1:20 pm-10:36 pm
1 stop8h 16m
Chicago Midway
Di 8/25
9:59 am-5:36 pm
2 stops8h 37m
$268
Colorado SpringsChicago
COS - ORD
COSORD
Colorado Springs
Di 8/25
8:10 am-6:19 pm
1 stop9h 09m
Chicago O'Hare Intl
Di 9/1
11:22 am-9:38 pm
2 stops11h 16m
$268
Colorado SpringsChicago
COS - ORD
COSORD
Colorado Springs
Mi 8/26
11:55 am-3:38 pm
Nonstop2h 43m
Chicago O'Hare Intl
Mo 8/31
7:45 pm-9:54 pm
Nonstop3h 09m
$323
Colorado SpringsMoline
COS - MLI
COSMLI
Colorado Springs
Di 10/6
3:58 pm-11:17 pm
1 stop6h 19m
Moline Quad-City
Sa 10/10
11:21 am-10:59 pm
2 stops12h 38m
$324
Colorado SpringsMoline
COS - MLI
COSMLI
Colorado Springs
Mi 9/23
1:03 pm-9:00 pm
2 stops6h 57m
Moline Quad-City
Di 9/29
6:32 am-10:55 am
1 stop5h 23m
$324
Colorado SpringsSt. Louis
COS - STL
COSSTL
Colorado Springs
Do 9/3
5:30 am-1:40 pm
1 stop7h 10m
Lambert-St Louis
Mo 9/7
6:25 am-9:45 am
1 stop4h 20m
$333
Showing 1-10 of 58 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-ORD
COS-STL
COS-MDW
COS-MLI
COS-PIA
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-ORD
COS-STL
COS-MDW
COS-MLI
What is the cheapest month to book a flight from Colorado Springs to Illinois?
Currently, January is the cheapest month in which you can book a flight from Colorado Springs to Illinois (average of $286). Flying from Colorado Springs to Illinois in December is currently the most expensive (average of $453). 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 Juli 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 Juli 30, 2026.
The most flights from COS to USIL are scheduled on a Monday (5 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (3 on average).
How much does it cost to fly round-trip from Colorado Springs to Illinois?
Airfare is below average for this route at the moment.
Colorado Springs to Illinois flights typically cost between $373 and $382 in September.The cheapest round-trip price found within the last 5 days was $243 on American Airlines (Sep 14-Sep 23).
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 74 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
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 Juli 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.
Crew
8.6
Entertainment
7.5
Food
7.0
Comfort
8.0
Overall
8.0
Boarding
8.1
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Crew
8.6
Entertainment
7.5
Food
7.0
Comfort
8.0
Overall
8.0
Boarding
8.1
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Crew
8.6
Entertainment
7.5
Food
7.0
Comfort
8.0
Overall
8.0
Boarding
8.1
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Crew
8.6
Entertainment
7.5
Food
7.0
Comfort
8.0
Overall
8.0
Boarding
8.1
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
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
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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 Juli 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 Juli 30, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$166 | Average$483 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$227 | Average$381 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$234 | Average$411 | FlexibilityNo cancel fee | On-time69% |