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$109+ 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 9/9. Fares are subject to change and may not be available on all flights or dates of travel.
COS — ORD
août 4 — août 111
lun. 8/4
lun. 8/11
1 adult, Economy
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Cheap 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 juillet 30, 2025.

Round-trip from

$217
(Southwest)

One-way from

$109
(Southwest)

Popular in

May

Cheapest in

September

Average price

$221

Good round-trip deal

$275 or less

Good one-way deal

$171 or less
From Colorado Springs to Illinois
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One-way flight from Colorado Springs to Illinois
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Highest demand for flights based on searches. 11% potential increase in price ($25 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from Colorado Springs to Illinois.
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Price to beat on a one-way flight from Colorado Springs to Illinois.
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Find flight deals from Colorado Springs to Illinois

Cheapest flights from Colorado Springs to Illinois
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 juillet 30, 2025.

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.
mer. 9/1011:55 amCOS - MDW
Nonstop2h 20mSouthwest
sam. 9/135:35 pmMDW - COS
Nonstop2h 30mSouthwest
Deal found 7/28$217
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sam. 9/612:25 pmCOS - ORD
Nonstop2h 45mAmerican Airlines
mar. 9/99:56 amORD - COS
Nonstop2h 55mAmerican Airlines
Deal found 7/30$217
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.
sam. 9/1312:50 pmCOS - ORD
1 stop6h 07mUnited Airlines
mar. 9/167:50 pmORD - COS
Nonstop3h 04mUnited Airlines
Deal found 7/28$227
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.
mer. 8/275:55 pmCOS - STL
1 stop5h 43mDelta
mer. 9/36:00 amSTL - COS
1 stop5h 16mDelta
Deal found 7/30$237
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.
mar. 8/2611:11 amCOS - ORD
2 stops10h 26mDelta
mar. 9/26:10 amORD - COS
1 stop5h 06mDelta
Deal found 7/29$242
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.
sam. 9/611:05 amCOS - ORD
1 stop4h 40mSouthwest
lun. 9/83:10 pmORD - COS
1 stop7h 35mSouthwest
Deal found 7/28$243
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.
sam. 8/2312:02 pmCOS - PIA
1 stop7h 50mUnited Airlines
mar. 8/268:45 amPIA - COS
1 stop5h 29mUnited Airlines
Deal found 7/28$249
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.
sam. 9/133:40 pmCOS - STL
1 stop4h 06mUnited Airlines
lun. 10/134:50 pmSTL - COS
1 stop6h 04mUnited Airlines
Deal found 7/29$259
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.
ven. 9/121:11 pmCOS - MDW
1 stop7h 25mDelta
mar. 9/1612:43 pmMDW - COS
1 stop8h 56mDelta
Deal found 7/29$264
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.
lun. 10/204:54 pmCOS - STL
1 stop5h 50mAmerican Airlines
ven. 10/245:20 amSTL - COS
1 stop5h 26mAmerican Airlines
Deal found 7/29$272
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven. 10/35:59 pmCOS - ORD
2 stops26h 33mMultiple Airlines
dim. 10/55:46 pmORD - COS
1 stop16h 55mMultiple Airlines
Deal found 7/30$275
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.
lun. 12/85:10 pmCOS - STL
1 stop4h 10mSouthwest
lun. 12/155:55 amSTL - COS
1 stop6h 20mSouthwest
Deal found 7/29$281

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 juillet 30, 2025.
Use the filters below to find and compare flights from Colorado Springs to Illinois that are best for you.

Fly from

Colorado Springs

Fly to

Illinois

Route

Depart

Return

Price

Colorado SpringsChicago

COS - MDW

COSMDW

Colorado Springs

mer. 9/10

11:55 am-3:15 pm

Nonstop2h 20m

Chicago Midway

sam. 9/13

5:35 pm-7:05 pm

Nonstop2h 30m

$217

Colorado SpringsChicago

COS - ORD

COSORD

Colorado Springs

sam. 9/6

12:25 pm-4:10 pm

Nonstop2h 45m

Chicago O'Hare Intl

mar. 9/9

9:56 am-11:51 am

Nonstop2h 55m

$217

Colorado SpringsChicago

COS - ORD

COSORD

Colorado Springs

sam. 9/13

12:50 pm-7:57 pm

1 stop6h 07m

Chicago O'Hare Intl

mar. 9/16

7:50 pm-9:54 pm

Nonstop3h 04m

$227

Colorado SpringsSt. Louis

COS - STL

COSSTL

Colorado Springs

mer. 8/27

5:55 pm-12:38 am

1 stop5h 43m

Lambert-St Louis

mer. 9/3

6:00 am-10:16 am

1 stop5h 16m

$237

Colorado SpringsChicago

COS - ORD

COSORD

Colorado Springs

mar. 8/26

11:11 am-10:37 pm

2 stops10h 26m

Chicago O'Hare Intl

mar. 9/2

6:10 am-10:16 am

1 stop5h 06m

$242

Colorado SpringsChicago

COS - ORD

COSORD

Colorado Springs

sam. 9/6

11:05 am-4:45 pm

1 stop4h 40m

Chicago O'Hare Intl

lun. 9/8

3:10 pm-9:45 pm

1 stop7h 35m

$243

Colorado SpringsPeoria

COS - PIA

COSPIA

Colorado Springs

sam. 8/23

12:02 pm-8:52 pm

1 stop7h 50m

Greater Peoria

mar. 8/26

8:45 am-1:14 pm

1 stop5h 29m

$249

Colorado SpringsSt. Louis

COS - STL

COSSTL

Colorado Springs

sam. 9/13

3:40 pm-8:46 pm

1 stop4h 06m

Lambert-St Louis

lun. 10/13

4:50 pm-9:54 pm

1 stop6h 04m

$259

Colorado SpringsChicago

COS - MDW

COSMDW

Colorado Springs

ven. 9/12

1:11 pm-9:36 pm

1 stop7h 25m

Chicago Midway

mar. 9/16

12:43 pm-8:39 pm

1 stop8h 56m

$264

Colorado SpringsSt. Louis

COS - STL

COSSTL

Colorado Springs

lun. 10/20

4:54 pm-11:44 pm

1 stop5h 50m

Lambert-St Louis

ven. 10/24

5:20 am-9:46 am

1 stop5h 26m

$272

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Showing 1-10 of 30 results
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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.
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

What is the cheapest month to book a flight from Colorado Springs to Illinois?

Currently, August is the cheapest month in which you can book a flight from Colorado Springs to Illinois (average of $245). Flying from Colorado Springs to Illinois in March is currently the most expensive (average of $321). 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 juillet 30, 2025.

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 juillet 30, 2025.

The most flights from COS to USIL are scheduled on a Tuesday (5 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (2 on average).

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 juillet 30, 2025.
Read reviews from past customers who have flown Southwest, Delta, and United Airlines from Colorado Springs to Illinois. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,241 reviews

Entertainment

7.5

Food

7.0

Overall

8.0

Crew

8.6

Boarding

8.1

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Southwest
8.0
Very good
4,241 reviews
Southwest
8.0
Very good
4,241 reviews

Entertainment

7.5

Food

7.0

Overall

8.0

Crew

8.6

Boarding

8.1

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Delta
8.0
Very good
7,980 reviews
Southwest
8.0
Very good
4,241 reviews

Entertainment

7.5

Food

7.0

Overall

8.0

Crew

8.6

Boarding

8.1

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
United Airlines
7.4
Good
8,896 reviews
Southwest
8.0
Very good
4,241 reviews

Entertainment

7.5

Food

7.0

Overall

8.0

Crew

8.6

Boarding

8.1

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,241 reviews

Entertainment

7.5

Food

7.0

Overall

8.0

Crew

8.6

Boarding

8.1

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

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.

  • What airport do you fly from for flights from Colorado Springs to Illinois?

    If you book a flight to Illinois from Colorado Springs, you will be flying from Colorado Springs, which is the city’s only airport. Colorado Springs (COS) is located 6.7 mi from the center of Colorado Springs.

  • What are the cheapest airlines to fly from Colorado Springs to Illinois one-way?

    The cheapest airline one-way is Southwest, with whom users have recently found tickets for as low as $109. However, be on the lookout for offers from United Airlines and American Airlines, as they are both options that can get you from Colorado Springs to Illinois for a low price.

  • What are the most popular routes from Colorado Springs to Illinois?

    When deciding which route to take from Colorado Springs to Illinois consider Colorado Springs - Chicago O'Hare Intl, Colorado Springs - Chicago Midway or Colorado Springs - Lambert-St Louis as they are the most popular.

  • What are the most reliable airlines from Colorado Springs to Illinois?

    No one likes to see their flight delayed. When booking a flight from Colorado Springs to Illinois consider choosing Lufthansa (92%), United Airlines (91%) or Emirates (85%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Colorado Springs to Illinois?

    The cheapest flight price from Colorado Springs to Illinois is $135. On average you can expect to pay $543. The most popular route, (Colorado Springs - Chicago O'Hare Intl), can usually be booked for $217.

  • Can I find deals for flights from Colorado Springs to Illinois that include hotel bookings?

    Yes. In addition to deals on Colorado Springs to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Colorado Springs to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Colorado Springs to Illinois.

  • Can I find deals for business class flights from Colorado Springs to Illinois?

    Yes. Cheapflights offers flight deals from Colorado Springs to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Colorado Springs to Illinois?

    Currently, August is the cheapest month in which you can book a flight from Colorado Springs to Illinois (average of $245). Flying from Colorado Springs to Illinois in March is currently the most expensive (average of $321). 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.

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Alternative routes for Colorado Springs to Illinois

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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 juillet 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$217Average$404FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$274Average$470FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$281Average$336FlexibilityNo cancel feeOn-time63%

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