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Cheap flights from Chicago to Illinois from $46

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Chicago to Illinois departing on 9/30. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Chicago to Illinois

Cheap round-trip flights

Southwest Logo
6:35 am - 7:45 amMDW-STL
1h 10mnonstop
Southwest Logo
1:55 pm - 3:05 pmSTL-MDW
1h 10mnonstop
$91Southwest
Find Deal
Sat, Sep 20 - Sat, Oct 4
United Airlines Logo
1:05 pm - 2:33 pmORD-STL
1h 28mnonstop
United Airlines Logo
6:35 am - 8:05 amSTL-ORD
1h 30mnonstop
$91United Airlines
Find Deal
Wed, Aug 27 - Wed, Sep 3
American Airlines Logo
8:31 pm - 9:53 pmORD-STL
1h 22mnonstop
American Airlines Logo
6:10 am - 7:30 amSTL-ORD
1h 20mnonstop
$92American Airlines
Find Deal
Sat, Sep 13 - Sat, Sep 20
Contour Logo
12:50 pm - 2:10 pmORD-BRL
1h 20mnonstop
Contour Logo
3:25 pm - 4:45 pmBRL-ORD
1h 20mnonstop
$103Contour
Find Deal
Wed, Sep 24 - Mon, Sep 29
Contour Logo
5:35 pm - 6:55 pmORD-BRL
1h 20mnonstop
Contour Logo
3:25 pm - 4:45 pmBRL-ORD
1h 20mnonstop
$104Contour
Find Deal
Thu, Aug 21 - Sun, Aug 24
American Airlines Logo
6:00 pm - 7:21 pmORD-STL
1h 21mnonstop
American Airlines Logo
7:23 am - 8:48 amSTL-ORD
1h 25mnonstop
$120American Airlines
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Sat, Aug 23 - Sun, Aug 24
Southern / Mokulele Logo
8:15 am - 12:00 pmORD-STL
3h 45m1 stop
Southern / Mokulele Logo
9:20 am - 4:19 pmSTL-ORD
6h 59m1 stop
$167Southern / Mokulele
Find Deal
Fri, Sep 12 - Fri, Sep 19
Southern / Mokulele Logo
1:10 pm - 12:10 pmORD-STL
23h 00m1 stop
Southern / Mokulele Logo
5:15 pm - 7:37 amSTL-ORD
14h 22m1 stop
$168Southern / Mokulele
Find Deal
Sat, Aug 23 - Sun, Aug 24
Delta Logo
9:20 am - 4:14 pmMDW-STL
6h 54m1 stop
Delta Logo
3:55 pm - 9:10 pmSTL-MDW
5h 15m1 stop
$177Delta
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Sat, Sep 20 - Sat, Oct 4
Delta Logo
9:47 am - 2:41 pmORD-STL
4h 54m1 stop
Delta Logo
5:11 pm - 11:56 pmSTL-ORD
6h 45m1 stop
$177Delta
Find Deal
Tue, Aug 19 - Thu, Aug 21

Southwest flights from Chicago to Illinois

Our best Southwest deals on Chicago to Illinois flight tickets
Southwest
Sep 20
MDW6:35 amChicago Midway
1h 10m
STL7:45 amLambert-St Louis
Oct 4
STL1:55 pmLambert-St Louis
1h 10m
MDW3:05 pmChicago Midway
$91
Find similar
Southwest
Oct 16
MDW7:40 amChicago Midway
1h 10m
STL8:50 amLambert-St Louis
Oct 18
STL1:55 pmLambert-St Louis
1h 10m
MDW3:05 pmChicago Midway
$94
Find similar
Southwest
Aug 27
MDW6:00 amChicago Midway
5h 30m
1 stop
STL11:30 amLambert-St Louis
Sep 3
STL4:35 pmLambert-St Louis
1h 10m
MDW5:45 pmChicago Midway
$101
Find similar

Delta flights from Chicago to Illinois

Our best Delta deals on Chicago to Illinois flight tickets
Delta
Aug 19
ORD9:47 amChicago O'Hare Intl
4h 54m
1 stop
STL2:41 pmLambert-St Louis
Aug 21
STL5:11 pmLambert-St Louis
6h 45m
1 stop
ORD11:56 pmChicago O'Hare Intl
$177
Find similar
Delta
Aug 23
MDW9:31 amChicago Midway
9h 36m
2 stops
STL7:07 pmLambert-St Louis
Aug 24
STL5:11 pmLambert-St Louis
4h 33m
1 stop
MDW9:44 pmChicago Midway
$181
Find similar
Delta
Aug 27
MDW4:25 pmChicago Midway
5h 37m
1 stop
STL10:02 pmLambert-St Louis
Sep 3
STL6:00 amLambert-St Louis
6h 28m
2 stops
MDW12:28 pmChicago Midway
$182
Find similar

momondo 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, momondo users made 832,500 searches. Data last updated July 31, 2025.
Use the filters below to find and compare flights from Chicago to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Sat 9/20

6:35 am-7:45 am

Nonstop1h 10m

Lambert-St Louis

Sat 10/4

1:55 pm-3:05 pm

Nonstop1h 10m

$91

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Wed 8/27

1:05 pm-2:33 pm

Nonstop1h 28m

Lambert-St Louis

Wed 9/3

6:35 am-8:05 am

Nonstop1h 30m

$91

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Sat 9/13

8:31 pm-9:53 pm

Nonstop1h 22m

Lambert-St Louis

Sat 9/20

6:10 am-7:30 am

Nonstop1h 20m

$92

ChicagoBurlington

ORD - BRL

ORDBRL

Chicago O'Hare Intl

Wed 9/24

12:50 pm-2:10 pm

Nonstop1h 20m

Burlington

Mon 9/29

3:25 pm-4:45 pm

Nonstop1h 20m

$103

ChicagoBurlington

ORD - BRL

ORDBRL

Chicago O'Hare Intl

Thu 8/21

5:35 pm-6:55 pm

Nonstop1h 20m

Burlington

Sun 8/24

3:25 pm-4:45 pm

Nonstop1h 20m

$104

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Sat 8/23

6:00 pm-7:21 pm

Nonstop1h 21m

Lambert-St Louis

Sun 8/24

7:23 am-8:48 am

Nonstop1h 25m

$120

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Fri 9/12

8:15 am-12:00 pm

1 stop3h 45m

Lambert-St Louis

Fri 9/19

9:20 am-4:19 pm

1 stop6h 59m

$167

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Sat 8/23

1:10 pm-12:10 pm

1 stop23h 00m

Lambert-St Louis

Sun 8/24

5:15 pm-7:37 am

1 stop14h 22m

$168

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Sat 9/20

9:20 am-4:14 pm

1 stop6h 54m

Lambert-St Louis

Sat 10/4

3:55 pm-9:10 pm

1 stop5h 15m

$177

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 8/19

9:47 am-2:41 pm

1 stop4h 54m

Lambert-St Louis

Thu 8/21

5:11 pm-11:56 pm

1 stop6h 45m

$177

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Illinois from

How to get the cheapest flight ticket from Chicago to Illinois

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest Chicago to Illinois flight route?

Fly from Chicago O'Hare Intl to Greater Peoria for the best Chicago - Illinois flight prices

What cabin class options are available on Chicago to Illinois flights?

There are 4 cabin classes available to choose from on Chicago to Illinois flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Cheap Chicago to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Chicago to Illinois

Best Price Found

$46

Fastest flight time

0h 56m

Direct flights

Every day

Airports in Illinois

8 airports
The best one-way flight to Illinois from Chicago in the past 72 hours is $46. The best round-trip flight deal from Chicago to Illinois found on momondo in the last 72 hours is $91.
The fastest flight from Chicago to Illinois takes 0h 56m
Direct flights go from Chicago to Illinois every day.
There are 8 airports near Illinois: Decatur Arpt (DEC), Evansville Dress Regional (EVV), Greater Peoria (PIA), Lambert-St Louis (STL), Moline Quad-City (MLI), Burlington (BRL), Springfield Capital (SPI), Champaign University-Willard (CMI)
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  • When did momondo last update prices for flights from Chicago to Illinois?

    Prices for flights from Chicago to Illinois were last updated today.

  • How many operators does momondo search for flights from Chicago to Illinois?

  • How old do you have to be to fly from Chicago to Illinois?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Chicago to Illinois.

  • What documentation or ID do you need to fly to Illinois?

    The travel and health documents required for your trip to Illinois can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Illinois. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular plane model from Chicago to Illinois?

Best airlines flying from Chicago to Illinois

Compare and see reviews for airlines that fly from Chicago to Illinois with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $179Free CancellationRating
7.4
8,900 reviews
Search United Airlines flights
American AirlinesPriceFrom $295Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Chicago to Illinois?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Chicago to Illinois. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Chicago to Illinois with flexible booking policies on momondo?

momondo does allow users to show only those flights to Illinois from Chicago which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Chicago to Illinois?

momondo helps you find the best flight between Chicago and Illinois by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Chicago to Illinois right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Chicago to Illinois flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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