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$64+ 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 12/9. Fares are subject to change and may not be available on all flights or dates of travel.
COS — ORD
oct. 11 — oct. 181
sáb. 10/11
sáb. 10/18
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 septiembre 11, 2025.

Round-trip from

$159
(United Airlines)

One-way from

$64
(United Airlines)

Popular in

May

Cheapest in

October

Average price

$165

Good round-trip deal

$283 or less

Good one-way deal

$178 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. 10% potential increase in price ($23 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($3 potential savings vs. average RT price).
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Average for round-trip flights in September 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 septiembre 11, 2025.

This United Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” 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.
dom. 11/166:20 pmCOS - ORD
1 stop4h 39mUnited Airlines
mar. 11/189:20 amORD - COS
Nonstop3h 06mUnited Airlines
Deal found 9/11$156
This United Airlines deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” 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.
sáb. 11/86:20 pmCOS - ORD
1 stop4h 39mUnited Airlines
sáb. 11/159:20 amORD - COS
Nonstop3h 06mUnited Airlines
Deal found 9/9$159
This American Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” 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.
jue. 10/234:54 pmCOS - STL
1 stop5h 55mAmerican Airlines
mié. 10/295:20 amSTL - COS
1 stop5h 26mAmerican Airlines
Deal found 9/11$172
This United Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” 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.
vie. 10/246:00 amCOS - ORD
Nonstop2h 41mUnited Airlines
lun. 10/278:00 pmORD - COS
1 stop4h 59mUnited Airlines
Deal found 9/11$175
This United Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” 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.
mié. 10/812:00 pmCOS - STL
1 stop5h 57mUnited Airlines
sáb. 10/115:15 amSTL - COS
1 stop6h 25mUnited Airlines
Deal found 9/11$185
This United Airlines deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” 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.
mar. 10/2112:54 pmCOS - ORD
1 stop6h 01mUnited Airlines
sáb. 10/256:28 pmORD - COS
1 stop4h 26mUnited Airlines
Deal found 9/10$185
This American Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” 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.
sáb. 11/812:40 pmCOS - ORD
Nonstop2h 46mAmerican Airlines
lun. 11/105:18 amORD - COS
1 stop7h 30mAmerican Airlines
Deal found 9/11$197
This Southwest deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” 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.
sáb. 10/258:20 amCOS - MDW
Nonstop2h 25mSouthwest
lun. 10/2712:00 pmMDW - COS
Nonstop2h 35mSouthwest
Deal found 9/10$205
This United Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” 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.
vie. 10/176:20 pmCOS - ORD
1 stop4h 39mUnited Airlines
dom. 10/195:01 amORD - COS
1 stop5h 04mUnited Airlines
Deal found 9/11$213
This Delta deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” 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.
lun. 10/205:49 pmCOS - STL
1 stop5h 35mDelta
vie. 10/242:29 pmSTL - COS
1 stop8h 41mDelta
Deal found 9/11$217
This United Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” 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.
jue. 10/306:00 amCOS - ORD
1 stop4h 23mUnited Airlines
sáb. 11/17:45 pmORD - COS
Nonstop3h 02mUnited Airlines
Deal found 9/11$220
This Delta deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” 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.
jue. 10/236:00 amCOS - STL
1 stop7h 43mDelta
mié. 10/2911:21 amSTL - COS
2 stops11h 49mDelta
Deal found 9/11$222

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 septiembre 11, 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 SpringsSt. Louis

COS - STL

COSSTL

Colorado Springs

jue. 1/8

12:13 pm-9:04 pm

1 stop7h 51m

Lambert-St Louis

dom. 1/11

5:54 pm-9:44 pm

1 stop4h 50m

$185

Colorado SpringsSt. Louis

COS - STL

COSSTL

Colorado Springs

mié. 10/8

12:00 pm-6:57 pm

1 stop5h 57m

Lambert-St Louis

sáb. 10/11

5:15 am-10:40 am

1 stop6h 25m

$185

Colorado SpringsChicago

COS - ORD

COSORD

Colorado Springs

mar. 10/21

12:54 pm-7:55 pm

1 stop6h 01m

Chicago O'Hare Intl

sáb. 10/25

6:28 pm-9:54 pm

1 stop4h 26m

$185

Colorado SpringsChicago

COS - ORD

COSORD

Colorado Springs

mié. 10/22

12:54 pm-7:55 pm

1 stop6h 01m

Chicago O'Hare Intl

sáb. 10/25

6:28 pm-9:54 pm

1 stop4h 26m

$185

Colorado SpringsChicago

COS - MDW

COSMDW

Colorado Springs

sáb. 10/25

8:20 am-11:45 am

Nonstop2h 25m

Chicago Midway

lun. 10/27

12:00 pm-1:35 pm

Nonstop2h 35m

$205

Colorado SpringsSt. Louis

COS - STL

COSSTL

Colorado Springs

lun. 10/20

5:49 pm-12:24 am

1 stop5h 35m

Lambert-St Louis

vie. 10/24

2:29 pm-10:10 pm

1 stop8h 41m

$217

Colorado SpringsSt. Louis

COS - STL

COSSTL

Colorado Springs

jue. 10/23

6:00 am-2:43 pm

1 stop7h 43m

Lambert-St Louis

mié. 10/29

2:29 pm-10:10 pm

1 stop8h 41m

$217

Colorado SpringsChicago

COS - ORD

COSORD

Colorado Springs

sáb. 11/8

6:00 am-2:58 pm

1 stop7h 58m

Chicago O'Hare Intl

sáb. 11/15

2:30 pm-10:23 pm

2 stops8h 53m

$222

Colorado SpringsChicago

COS - ORD

COSORD

Colorado Springs

jue. 10/2

3:40 pm-11:59 pm

1 stop7h 19m

Chicago O'Hare Intl

sáb. 10/4

7:51 pm-9:41 pm

Nonstop2h 50m

$226

Colorado SpringsChicago

COS - MDW

COSMDW

Colorado Springs

sáb. 11/8

8:09 am-10:14 pm

2 stops13h 05m

Chicago Midway

sáb. 11/15

9:32 am-6:22 pm

2 stops9h 50m

$227

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Showing 1-10 of 60 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 septiembre 11, 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 septiembre 11, 2025.

The most flights from COS to USIL are scheduled on a Wednesday (5 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (3 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 septiembre 11, 2025.
Read reviews from past customers who have flown Southwest, United Airlines, and American 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
4,248 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Crew

8.6

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Crew

8.6

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
United Airlines
7.4
Good
8,937 reviews
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Crew

8.6

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Crew

8.6

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

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.

  • How long is the flight from Colorado Springs to Illinois?

    American Airlines, United Airlines, and Southwest can get you from Colorado Springs to Illinois in just under 2h 25m. Your travel time can differ by up to 5h 26m. Colorado Springs and Illinois are separated by a distance of 915 mi. This flight may include one or multiple stops.

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

    The cheapest airline one-way is United Airlines, with whom users have recently found tickets for as low as $67. However, be on the lookout for offers from Southwest 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 United Airlines (87%), Emirates (75%) or SkyWest Airlines (72%) 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 $108. On average you can expect to pay $452. The most popular route, (Colorado Springs - Chicago O'Hare Intl), can usually be booked for $159.

  • 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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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 septiembre 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$166Average$408FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$233Average$337FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$290Average$445FlexibilityNo cancel feeOn-time69%

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