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$63+ Cheap flights from Chicago (CHI) 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 5/20. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — ORD
Mar 15 — Mar 221
Sat 3/15
Sat 3/22
1 adult, Economy
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Cheap flight deals from Chicago to Illinois

Keep the following information in mind while searching for Chicago to Illinois flight deals. Data was last updated March 10, 2025.

Round-trip from

$83
(Trip.com)

One-way from

$63
(Southwest)

Good round-trip deal

$180 or less

Good one-way deal

$107 or less
From Chicago (CHI) to Illinois
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One-way flight from Chicago (CHI) to Illinois
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Price to beat on a round-trip flight from Chicago (CHI) to Illinois.
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Price to beat on a one-way flight from Chicago (CHI) to Illinois.
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Find flight deals from Chicago to Illinois

Cheapest flights from Chicago to Illinois
Explore the most affordable flight options available from Chicago to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 10, 2025.

This Trip.com deal was found by Cheapflights users on 3/9. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/88:25 amORD - BRL
Nonstop1h 40mSouthern / Mokulele
Tue 4/156:00 amBRL - ORD
Nonstop1h 40mSouthern / Mokulele
Deal found 3/9$83
This Southwest deal was found by Cheapflights users on 3/9. 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.
Wed 4/910:35 amMDW - STL
Nonstop1h 15mSouthwest
Wed 4/237:10 amSTL - MDW
Nonstop1h 05mSouthwest
Deal found 3/9$95
This United Airlines deal was found by Cheapflights users on 3/10. 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.
Thu 4/32:20 pmORD - STL
Nonstop1h 27mUnited Airlines
Mon 4/73:40 pmSTL - ORD
Nonstop1h 21mUnited Airlines
Deal found 3/10$95
This American Airlines deal was found by Cheapflights users on 3/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/39:57 amORD - STL
Nonstop1h 27mAmerican Airlines
Mon 4/77:35 amSTL - ORD
Nonstop1h 20mAmerican Airlines
Deal found 3/10$96
This Kiwi.com deal was found by Cheapflights users on 3/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/248:25 amORD - STL
1 stop11h 45mSouthern / Mokulele
Mon 3/3112:15 pmSTL - ORD
1 stop3h 35mSouthern / Mokulele
Deal found 3/10$115
This United Airlines deal was found by Cheapflights users on 3/9. 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.
Sun 4/67:45 amORD - DEC
Nonstop1h 09mUnited Airlines
Sun 4/132:35 pmDEC - ORD
Nonstop1h 05mUnited Airlines
Deal found 3/9$149
This Southwest deal was found by Cheapflights users on 3/9. 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.
Wed 4/97:00 amORD - STL
2 stops10h 45mSouthwest
Wed 4/238:00 amSTL - ORD
1 stop6h 00mSouthwest
Deal found 3/9$150
This Booking.com deal was found by Cheapflights users on 3/10. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/154:40 pmMDW - STL
1 stop7h 06mFrontier
Wed 4/164:57 pmSTL - MDW
1 stop16h 27mFrontier
Deal found 3/10$160
This Booking.com deal was found by Cheapflights users on 3/10. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/159:44 amORD - STL
1 stop14h 02mFrontier
Wed 4/166:51 pmSTL - ORD
1 stop5h 46mFrontier
Deal found 3/10$160
This Trip.com deal was found by Cheapflights users on 3/9. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/276:45 amORD - STL
1 stop26h 31mMultiple Airlines
Sun 3/3012:15 pmSTL - ORD
1 stop3h 35mMultiple Airlines
Deal found 3/9$161
This Delta deal was found by Cheapflights users on 3/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/239:20 amMDW - STL
1 stop3h 41mDelta
Wed 4/305:32 pmSTL - MDW
1 stop4h 50mDelta
Deal found 3/9$177
This Delta deal was found by Cheapflights users on 3/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/57:05 amORD - STL
1 stop4h 51mDelta
Sat 4/55:00 pmSTL - ORD
1 stop4h 45mDelta
Deal found 3/9$177

Find flights from Chicago to Illinois within your budget

Customize your flight search to find flights from Chicago 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 March 10, 2025.

Fly from

Chicago

Fly to

Illinois

Route

Depart

Return

Price

ChicagoBurlington

ORD - BRL

ORDBRL

Chicago O'Hare Intl

Tue 4/8

8:25 am-10:05 am

Nonstop1h 40m

Burlington

Tue 4/15

6:00 am-7:40 am

Nonstop1h 40m

$83

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Wed 4/9

10:35 am-11:50 am

Nonstop1h 15m

Lambert-St Louis

Wed 4/23

7:10 am-8:15 am

Nonstop1h 05m

$95

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 4/3

2:20 pm-3:47 pm

Nonstop1h 27m

Lambert-St Louis

Mon 4/7

3:40 pm-5:01 pm

Nonstop1h 21m

$95

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 4/3

9:57 am-11:24 am

Nonstop1h 27m

Lambert-St Louis

Mon 4/7

7:35 am-8:55 am

Nonstop1h 20m

$96

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Mon 3/24

8:25 am-8:10 pm

1 stop11h 45m

Lambert-St Louis

Mon 3/31

12:15 pm-3:50 pm

1 stop3h 35m

$115

ChicagoDecatur

ORD - DEC

ORDDEC

Chicago O'Hare Intl

Sun 4/6

7:45 am-8:54 am

Nonstop1h 09m

Decatur Arpt

Sun 4/13

2:35 pm-3:40 pm

Nonstop1h 05m

$149

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Wed 4/9

7:00 am-5:45 pm

2 stops10h 45m

Lambert-St Louis

Wed 4/23

8:00 am-2:00 pm

1 stop6h 00m

$150

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Tue 4/15

4:40 pm-11:46 pm

1 stop7h 06m

Lambert-St Louis

Wed 4/16

4:57 pm-9:24 am

1 stop16h 27m

$160

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 4/15

9:44 am-11:46 pm

1 stop14h 02m

Lambert-St Louis

Wed 4/16

6:51 pm-12:37 am

1 stop5h 46m

$160

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 3/27

6:45 am-9:16 am

1 stop26h 31m

Lambert-St Louis

Sun 3/30

12:15 pm-3:50 pm

1 stop3h 35m

$161

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/9

Showing 1-10 of 52 results
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Best time to book a flight from Chicago to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Chicago 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.

Travel insights for flights from Chicago to Illinois

Get recent, data-driven insights about flights from Chicago to Illinois including ideal travel times, pricing trends, and more.

What is the cheapest time of day to fly from CHI to IL?

Find hourly flight availability from Chicago 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 March 10, 2025.

When flying from Chicago to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 March 10, 2025.
To help decide which airline to fly from Chicago to Illinois, see what other customers have to say about Southwest, Delta and United Airlines. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,300 reviews

Food

7.1

Boarding

8.2

Crew

8.7

Overall

8.1

Comfort

8.1

Entertainment

7.6

Reviews

1 / 20

8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Southwest
8.1
Very good
4,300 reviews
Southwest
8.1
Very good
4,300 reviews

Food

7.1

Boarding

8.2

Crew

8.7

Overall

8.1

Comfort

8.1

Entertainment

7.6

Reviews

1 / 20

8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Delta
8.0
Very good
7,973 reviews
Southwest
8.1
Very good
4,300 reviews

Food

7.1

Boarding

8.2

Crew

8.7

Overall

8.1

Comfort

8.1

Entertainment

7.6

Reviews

1 / 20

8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

United Airlines
7.4
Good
8,631 reviews
Southwest
8.1
Very good
4,300 reviews

Food

7.1

Boarding

8.2

Crew

8.7

Overall

8.1

Comfort

8.1

Entertainment

7.6

Reviews

1 / 20

8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,300 reviews

Food

7.1

Boarding

8.2

Crew

8.7

Overall

8.1

Comfort

8.1

Entertainment

7.6

Reviews

1 / 20

8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Related info for your journey

Find useful and relevant information for your journey from Chicago to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

    The cheapest airline one-way is Southwest, with whom users have recently found tickets for as low as $63. However, be on the lookout for offers from Southern / Mokulele and United Airlines, as they are both options that can get you from Chicago to Illinois for a low price.

  • What are the most popular routes from Chicago to Illinois?

    Most travelers choose Chicago O'Hare Intl - Lambert-St Louis, Chicago Midway - Lambert-St Louis or Chicago O'Hare Intl - Evansville Dress Regional when deciding on the best route from Chicago to Illinois.

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

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

  • How can I find direct flights from Chicago to Illinois?

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

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

    Yes. Cheapflights offers flight deals from Chicago 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 Chicago to Illinois?

    Currently, August is the cheapest month in which you can book a flight from Chicago to Illinois (average of $245). Flying from Chicago to Illinois in March is currently the most expensive (average of $327). 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.

See more FAQs

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Alternative routes for Chicago to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 2 airlines flying from Chicago to Illinois

Discover the top 2 airlines that operate flights from Chicago 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 March 10, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$179Average$396FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$179Average$309FlexibilityNo cancel feeOn-time69%
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