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$46+ 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 9/13. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — ORD
jul. 8 — jul. 151
mar. 7/8
mar. 7/15
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 julio 3, 2025.

Round-trip from

$91
(Southwest)

One-way from

$46
(Southwest)

Good round-trip deal

$178 or less

Good one-way deal

$100 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 julio 3, 2025.

This Southwest deal was found by Cheapflights users on 7/2. 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.
mar. 8/511:25 amMDW - STL
Nonstop1h 10mSouthwest
mié. 8/68:40 amSTL - MDW
Nonstop1h 10mSouthwest
Deal found 7/2$91
This United Airlines deal was found by Cheapflights users on 7/2. 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. 8/129:20 pmORD - STL
Nonstop1h 25mUnited Airlines
mar. 8/195:30 pmSTL - ORD
Nonstop1h 25mUnited Airlines
Deal found 7/2$91
This American Airlines deal was found by Cheapflights users on 7/2. 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. 8/1610:08 pmORD - STL
Nonstop1h 16mAmerican Airlines
sáb. 8/234:19 pmSTL - ORD
Nonstop1h 26mAmerican Airlines
Deal found 7/2$92
This Mytrip deal was found by Cheapflights users on 7/2. 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.
sáb. 8/1611:30 amORD - BRL
Nonstop1h 20mContour
sáb. 8/239:20 amBRL - ORD
Nonstop1h 10mContour
Deal found 7/2$95
This Southwest deal was found by Cheapflights users on 7/1. 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. 8/162:55 pmORD - STL
1 stop5h 35mSouthwest
lun. 8/187:15 amSTL - ORD
1 stop8h 05mSouthwest
Deal found 7/1$114
This United Airlines deal was found by Cheapflights users on 7/1. 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. 8/57:45 amORD - DEC
Nonstop1h 03mUnited Airlines
mar. 8/129:45 amDEC - ORD
Nonstop1h 10mUnited Airlines
Deal found 7/1$149
This Jettzy deal was found by Cheapflights users on 7/1. 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 Jettzy is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 8/138:15 amORD - STL
1 stop3h 55mSouthern / Mokulele
mié. 8/201:00 pmSTL - ORD
1 stop18h 37mSouthern / Mokulele
Deal found 7/1$165
This Delta deal was found by Cheapflights users on 7/2. 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.
sáb. 8/167:17 pmMDW - STL
1 stop4h 05mDelta
sáb. 8/238:46 amSTL - MDW
1 stop4h 17mDelta
Deal found 7/2$177
This Delta deal was found by Cheapflights users on 7/2. 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.
sáb. 8/26:00 amORD - STL
1 stop4h 33mDelta
lun. 8/45:37 pmSTL - ORD
1 stop3h 57mDelta
Deal found 7/2$177
This American Airlines deal was found by Cheapflights users on 7/2. 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.
mar. 7/295:09 pmORD - MLI
Nonstop0h 57mAmerican Airlines
sáb. 8/26:37 pmMLI - ORD
Nonstop1h 13mAmerican Airlines
Deal found 7/2$179
This Expedia deal was found by Cheapflights users on 7/2. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 8/22:23 pmORD - STL
Nonstop1h 24mMultiple Airlines
lun. 8/41:00 pmSTL - ORD
1 stop3h 32mMultiple Airlines
Deal found 7/2$179
This United Airlines deal was found by Cheapflights users on 7/2. 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. 7/308:20 pmORD - PIA
Nonstop1h 12mUnited Airlines
mié. 8/63:39 pmPIA - ORD
Nonstop1h 11mUnited Airlines
Deal found 7/2$179

Cheapflights Fare Finder

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 julio 3, 2025.
Use the filters below to find and compare flights from Chicago to Illinois that are best for you.

Fly from

Chicago

Fly to

Illinois

Route

Depart

Return

Price

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

mar. 8/5

11:25 am-12:35 pm

Nonstop1h 10m

Lambert-St Louis

mié. 8/6

8:40 am-9:50 am

Nonstop1h 10m

$91

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

mar. 8/12

9:20 pm-10:45 pm

Nonstop1h 25m

Lambert-St Louis

mar. 8/19

5:30 pm-6:55 pm

Nonstop1h 25m

$91

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

sáb. 8/16

10:08 pm-11:24 pm

Nonstop1h 16m

Lambert-St Louis

sáb. 8/23

4:19 pm-5:45 pm

Nonstop1h 26m

$92

ChicagoBurlington

ORD - BRL

ORDBRL

Chicago O'Hare Intl

sáb. 8/16

11:30 am-12:50 pm

Nonstop1h 20m

Burlington

sáb. 8/23

9:20 am-10:30 am

Nonstop1h 10m

$95

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

sáb. 8/16

2:55 pm-8:30 pm

1 stop5h 35m

Lambert-St Louis

lun. 8/18

7:15 am-3:20 pm

1 stop8h 05m

$114

ChicagoDecatur

ORD - DEC

ORDDEC

Chicago O'Hare Intl

mar. 8/5

7:45 am-8:48 am

Nonstop1h 03m

Decatur Arpt

mar. 8/12

9:45 am-10:55 am

Nonstop1h 10m

$149

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

mié. 8/13

8:15 am-12:10 pm

1 stop3h 55m

Lambert-St Louis

mié. 8/20

1:00 pm-7:37 am

1 stop18h 37m

$165

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

sáb. 8/16

6:17 pm-9:55 pm

1 stop3h 38m

Lambert-St Louis

sáb. 8/23

6:40 am-12:28 pm

1 stop5h 48m

$177

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

sáb. 8/2

6:00 am-10:33 am

1 stop4h 33m

Lambert-St Louis

lun. 8/4

5:37 pm-9:34 pm

1 stop3h 57m

$177

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

sáb. 8/2

2:23 pm-3:47 pm

Nonstop1h 24m

Lambert-St Louis

lun. 8/4

1:00 pm-4:32 pm

1 stop3h 32m

$179

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

Showing 1-10 of 49 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.

Cheapflights Insights

Everything you need to know about your flight from Chicago to Illinois

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 $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 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 julio 3, 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.

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 julio 3, 2025.
Read reviews from past customers who have flown Southwest, Delta, and United Airlines from Chicago to Illinois. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,266 reviews

Boarding

8.2

Food

7.0

Crew

8.6

Comfort

8.0

Entertainment

7.6

Overall

8.0

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
4,266 reviews
Southwest
8.0
Very good
4,266 reviews

Boarding

8.2

Food

7.0

Crew

8.6

Comfort

8.0

Entertainment

7.6

Overall

8.0

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
7,982 reviews
Southwest
8.0
Very good
4,266 reviews

Boarding

8.2

Food

7.0

Crew

8.6

Comfort

8.0

Entertainment

7.6

Overall

8.0

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
8,861 reviews
Southwest
8.0
Very good
4,266 reviews

Boarding

8.2

Food

7.0

Crew

8.6

Comfort

8.0

Entertainment

7.6

Overall

8.0

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
4,266 reviews

Boarding

8.2

Food

7.0

Crew

8.6

Comfort

8.0

Entertainment

7.6

Overall

8.0

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 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 $46. However, be on the lookout for offers from United Airlines and Contour, 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 - Decatur Arpt 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 $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.

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 julio 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$169Average$379FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$179Average$294FlexibilityNo cancel feeOn-time69%

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