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$119+ 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 11/17. Fares are subject to change and may not be available on all flights or dates of travel.
COS — ORD
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 June 12, 2025.

Round-trip from

$217
(Southwest)

One-way from

$124
(Mytrip)

Popular in

May

Cheapest in

September

Average price

$213

Good round-trip deal

$291 or less

Good one-way deal

$158 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. 12% potential increase in price ($27 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 June 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 June 12, 2025.

This Delta deal was found by Cheapflights users on 6/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/305:55 pmCOS - STL
1 stop5h 42mDelta
Tue 10/77:20 amSTL - COS
1 stop6h 37mDelta
Deal found 6/10$217
This Southwest deal was found by Cheapflights users on 6/10. 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.
Mon 8/115:30 amCOS - STL
1 stop7h 05mSouthwest
Sat 8/165:45 amSTL - COS
1 stop5h 35mSouthwest
Deal found 6/10$234
This Southwest deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/611:55 amCOS - MDW
Nonstop2h 20mSouthwest
Sat 8/95:35 pmMDW - COS
Nonstop2h 30mSouthwest
Deal found 6/12$251
This American Airlines deal was found by Cheapflights users on 6/11. 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.
Sat 8/3012:07 pmCOS - ORD
Nonstop2h 43mAmerican Airlines
Sat 9/69:56 amORD - COS
Nonstop2h 55mAmerican Airlines
Deal found 6/11$251
This American Airlines deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/612:13 pmCOS - STL
1 stop6h 47mAmerican Airlines
Sun 11/97:49 amSTL - COS
1 stop4h 41mAmerican Airlines
Deal found 6/12$253
This American Airlines deal was found by Cheapflights users on 6/11. 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.
Thu 6/2612:01 pmCOS - PIA
1 stop4h 55mAmerican Airlines
Mon 6/304:43 pmPIA - COS
1 stop6h 39mAmerican Airlines
Deal found 6/11$259
This United Airlines deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/612:05 pmCOS - ORD
Nonstop2h 40mUnited Airlines
Sat 8/99:15 amORD - COS
Nonstop2h 53mUnited Airlines
Deal found 6/12$259
This Delta deal was found by Cheapflights users on 6/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/96:00 amCOS - MDW
1 stop8h 27mDelta
Wed 8/2012:43 pmMDW - COS
1 stop8h 58mDelta
Deal found 6/10$271
This Delta deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/66:00 amCOS - ORD
2 stops9h 33mDelta
Sat 8/96:00 amORD - COS
1 stop4h 59mDelta
Deal found 6/12$276
This Southwest deal was found by Cheapflights users on 6/9. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/115:30 amCOS - ORD
1 stop8h 50mSouthwest
Wed 8/133:00 pmORD - COS
1 stop8h 40mSouthwest
Deal found 6/9$278
This United Airlines deal was found by Cheapflights users on 6/10. 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.
Mon 9/2912:54 pmCOS - STL
1 stop6h 52mUnited Airlines
Mon 10/63:23 pmSTL - COS
1 stop7h 18mUnited Airlines
Deal found 6/10$287
This Mytrip deal was found by Cheapflights users on 6/11. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/115:09 pmCOS - ORD
2 stops11h 54mMultiple Airlines
Fri 7/187:08 amORD - COS
2 stops10h 11mMultiple Airlines
Deal found 6/11$297

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 June 12, 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

Tue 8/5

10:54 am-4:42 pm

1 stop4h 48m

Lambert-St Louis

Tue 8/12

6:00 am-10:16 am

1 stop5h 16m

$217

Colorado SpringsSt. Louis

COS - STL

COSSTL

Colorado Springs

Mon 8/11

5:30 am-1:35 pm

1 stop7h 05m

Lambert-St Louis

Sat 8/16

5:45 am-10:20 am

1 stop5h 35m

$234

Colorado SpringsChicago

COS - ORD

COSORD

Colorado Springs

Sat 8/30

12:07 pm-3:50 pm

Nonstop2h 43m

Chicago O'Hare Intl

Sat 9/6

9:56 am-11:51 am

Nonstop2h 55m

$251

Colorado SpringsChicago

COS - MDW

COSMDW

Colorado Springs

Wed 8/6

11:55 am-3:15 pm

Nonstop2h 20m

Chicago Midway

Sat 8/9

5:35 pm-7:05 pm

Nonstop2h 30m

$251

Colorado SpringsChicago

COS - ORD

COSORD

Colorado Springs

Wed 8/6

12:05 pm-3:45 pm

Nonstop2h 40m

Chicago O'Hare Intl

Sat 8/9

9:15 am-11:08 am

Nonstop2h 53m

$259

Colorado SpringsPeoria

COS - PIA

COSPIA

Colorado Springs

Thu 6/26

12:01 pm-5:56 pm

1 stop4h 55m

Greater Peoria

Mon 6/30

4:43 pm-10:22 pm

1 stop6h 39m

$259

Colorado SpringsChicago

COS - MDW

COSMDW

Colorado Springs

Sat 8/9

6:00 am-3:27 pm

1 stop8h 27m

Chicago Midway

Wed 8/20

12:43 pm-8:41 pm

1 stop8h 58m

$271

Colorado SpringsChicago

COS - ORD

COSORD

Colorado Springs

Wed 8/6

6:00 am-4:33 pm

2 stops9h 33m

Chicago O'Hare Intl

Sat 8/9

6:00 am-9:59 am

1 stop4h 59m

$276

Colorado SpringsChicago

COS - ORD

COSORD

Colorado Springs

Fri 7/11

5:09 pm-6:03 am

2 stops11h 54m

Chicago O'Hare Intl

Fri 7/18

7:08 am-4:19 pm

2 stops10h 11m

$297

Colorado SpringsMoline

COS - MLI

COSMLI

Colorado Springs

Wed 7/9

5:30 am-3:07 pm

2 stops8h 37m

Moline Quad-City

Wed 7/16

5:20 pm-9:44 pm

1 stop5h 24m

$302

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/12

Showing 1-10 of 33 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 June 12, 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 June 12, 2025.

The most flights from COS to USIL are scheduled on a Wednesday (5 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (3 on average).

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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 June 12, 2025.
See what other customers who have flown with Southwest, Delta and United Airlines from Colorado Springs to Illinois have to say. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,287 reviews

Boarding

8.2

Food

7.1

Crew

8.6

Comfort

8.0

Overall

8.0

Entertainment

7.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Southwest
8.0
Very good
4,287 reviews
Southwest
8.0
Very good
4,287 reviews

Boarding

8.2

Food

7.1

Crew

8.6

Comfort

8.0

Overall

8.0

Entertainment

7.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Delta
8.0
Very good
7,950 reviews
Southwest
8.0
Very good
4,287 reviews

Boarding

8.2

Food

7.1

Crew

8.6

Comfort

8.0

Overall

8.0

Entertainment

7.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
United Airlines
7.4
Good
8,790 reviews
Southwest
8.0
Very good
4,287 reviews

Boarding

8.2

Food

7.1

Crew

8.6

Comfort

8.0

Overall

8.0

Entertainment

7.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Allegiant Air
7.3
Good
725 reviews
Southwest
8.0
Very good
4,287 reviews

Boarding

8.2

Food

7.1

Crew

8.6

Comfort

8.0

Overall

8.0

Entertainment

7.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,287 reviews

Boarding

8.2

Food

7.1

Crew

8.6

Comfort

8.0

Overall

8.0

Entertainment

7.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

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 $126. However, be on the lookout for offers from American Airlines and Delta, 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 Emirates (95%), United Airlines (94%) or SkyWest Airlines (93%) 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 $127. On average you can expect to pay $1,393. The most popular route, (Colorado Springs - Chicago O'Hare Intl), can usually be booked for $255.

  • 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$217Average$367FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$268Average$430FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$283Average$336FlexibilityNo cancel feeOn-time63%

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