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Cheap flights from Chicago to Illinois from $34

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 1/22. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
Contour Logo
6:25 pm - 7:45 pm
ORD
-
BRL
1h 20mnonstop
Contour Logo
4:25 pm - 5:45 pm
BRL
-
ORD
1h 20mnonstop
$68Contour
Mon, Jan 12 - Fri, Jan 16
Contour Logo
10:50 am - 12:10 pm
ORD
-
BRL
1h 20mnonstop
Contour Logo
4:25 pm - 5:45 pm
BRL
-
ORD
1h 20mnonstop
$69Contour
Wed, Dec 24 - Sun, Dec 28
Contour Logo
10:50 am - 12:10 pm
ORD
-
BRL
1h 20mnonstop
Contour Logo
9:00 am - 10:10 am
BRL
-
ORD
1h 10mnonstop
$77Contour
Thu, Jan 1 - Sat, Jan 31
United Airlines Logo
4:50 pm - 5:59 pm
ORD
-
DEC
1h 09mnonstop
United Airlines Logo
7:09 pm - 8:25 pm
DEC
-
ORD
1h 16mnonstop
$149United Airlines
Mon, Dec 22 - Fri, Dec 26
Frontier Logo
11:45 am - 11:33 pm
ORD
-
STL
11h 48m1 stop
Frontier Logo
5:42 pm - 10:41 am
STL
-
ORD
16h 59m1 stop
$152Frontier
Fri, Jan 23 - Sun, Jan 25
Multiple Airlines Logo
5:50 am - 2:48 pm
ORD
-
STL
8h 58m1 stop
Multiple Airlines Logo
5:11 pm - 1:13 pm
STL
-
ORD
20h 02m1 stop
$154Multiple Airlines
Thu, Jan 8 - Mon, Jan 12
Frontier Logo
6:10 am - 2:48 pm
MDW
-
STL
8h 38m1 stop
Frontier Logo
8:50 am - 11:09 pm
STL
-
MDW
14h 19m1 stop
$155Frontier
Thu, Jan 8 - Mon, Jan 12
United Airlines Logo
4:52 pm - 6:01 pm
ORD
-
DEC
1h 09mnonstop
United Airlines Logo
9:49 am - 11:05 am
DEC
-
ORD
1h 16mnonstop
$158United Airlines
Sat, Jan 17 - Sun, Jan 18
Multiple Airlines Logo
8:27 pm - 7:50 am
ORD
-
STL
11h 23m1 stop
Multiple Airlines Logo
5:11 pm - 1:13 pm
STL
-
ORD
20h 02m1 stop
$158Multiple Airlines
Thu, Jan 8 - Mon, Jan 12
Southwest Logo
1:50 pm - 3:00 pm
MDW
-
STL
1h 10mnonstop
Southwest Logo
8:20 am - 9:30 am
STL
-
MDW
1h 10mnonstop
$171Southwest
Thu, Jan 8 - Mon, Jan 12

Southwest flights from Chicago to Illinois

Our best Southwest deals on Chicago to Illinois flight tickets
Southwest
Jan 8
MDW1:50 pmChicago Midway
1h 10m
STL3:00 pmLambert-St Louis
Jan 12
STL8:20 amLambert-St Louis
1h 10m
MDW9:30 amChicago Midway
$171
Find similar
Southwest
Jan 8
MDW1:50 pmChicago Midway
1h 10m
STL3:00 pmLambert-St Louis
Jan 12
STL8:20 amLambert-St Louis
4h 50m
1 stop
MDW1:10 pmChicago Midway
$181
Find similar
Southwest
Jan 8
MDW1:20 pmChicago Midway
7h 15m
2 stops
STL8:35 pmLambert-St Louis
Jan 12
STL6:50 amLambert-St Louis
7h 05m
2 stops
MDW1:55 pmChicago Midway
$201
Find similar

Frontier flights from Chicago to Illinois

Our best Frontier deals on Chicago to Illinois flight tickets
Frontier
Jan 23
ORD11:45 amChicago O'Hare Intl
11h 48m
1 stop
STL11:33 pmLambert-St Louis
Jan 25
STL5:42 pmLambert-St Louis
16h 59m
1 stop
ORD10:41 amChicago O'Hare Intl
$152
Find similar
Frontier
Jan 6
ORD5:29 pmChicago O'Hare Intl
29h 04m
1 stop
STL10:33 pmLambert-St Louis
Jan 13
STL5:11 pmLambert-St Louis
18h 57m
2 stops
ORD12:08 pmChicago O'Hare Intl
$154
Find similar
Frontier
Jan 8
MDW6:10 amChicago Midway
8h 38m
1 stop
STL2:48 pmLambert-St Louis
Jan 12
STL8:50 amLambert-St Louis
14h 19m
1 stop
MDW11:09 pmChicago Midway
$155
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 December 9, 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

ChicagoBurlington

ORD - BRL

ORDBRL

Chicago O'Hare Intl

Mon 1/12

6:25 pm-7:45 pm

Nonstop1h 20m

Burlington

Fri 1/16

4:25 pm-5:45 pm

Nonstop1h 20m

$68

ChicagoBurlington

ORD - BRL

ORDBRL

Chicago O'Hare Intl

Wed 12/24

10:50 am-12:10 pm

Nonstop1h 20m

Burlington

Sun 12/28

4:25 pm-5:45 pm

Nonstop1h 20m

$69

ChicagoBurlington

ORD - BRL

ORDBRL

Chicago O'Hare Intl

Thu 1/1

10:50 am-12:10 pm

Nonstop1h 20m

Burlington

Sat 1/31

9:00 am-10:10 am

Nonstop1h 10m

$77

ChicagoDecatur

ORD - DEC

ORDDEC

Chicago O'Hare Intl

Mon 12/22

4:50 pm-5:59 pm

Nonstop1h 09m

Decatur Arpt

Fri 12/26

7:09 pm-8:25 pm

Nonstop1h 16m

$149

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Fri 1/23

11:45 am-11:33 pm

1 stop11h 48m

Lambert-St Louis

Sun 1/25

5:42 pm-10:41 am

1 stop16h 59m

$152

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 1/8

5:50 am-2:48 pm

1 stop8h 58m

Lambert-St Louis

Mon 1/12

5:11 pm-1:13 pm

1 stop20h 02m

$154

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Thu 1/8

6:10 am-2:48 pm

1 stop8h 38m

Lambert-St Louis

Mon 1/12

8:50 am-11:09 pm

1 stop14h 19m

$155

ChicagoDecatur

ORD - DEC

ORDDEC

Chicago O'Hare Intl

Sat 1/17

4:52 pm-6:01 pm

Nonstop1h 09m

Decatur Arpt

Sun 1/18

9:49 am-11:05 am

Nonstop1h 16m

$158

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 1/8

8:27 pm-7:50 am

1 stop11h 23m

Lambert-St Louis

Mon 1/12

5:11 pm-1:13 pm

1 stop20h 02m

$158

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Thu 1/8

1:50 pm-3:00 pm

Nonstop1h 10m

Lambert-St Louis

Mon 1/12

8:20 am-9:30 am

Nonstop1h 10m

$171

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 Greater Rockford to Chicago O'Hare Intl 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

$44

Fastest flight time

0h 54m

Direct flights

Every day

Airports in Illinois

7 airports
The best one-way flight to Illinois from Chicago in the past 72 hours is $44. The best round-trip flight deal from Chicago to Illinois found on momondo in the last 72 hours is $138.
The fastest flight from Chicago to Illinois takes 0h 54m
Direct flights go from Chicago to Illinois every day.
There are 7 airports near Illinois: Decatur Arpt (DEC), Greater Peoria (PIA), Lambert-St Louis (STL), Moline Quad-City (MLI), Springfield Capital (SPI), Champaign University-Willard (CMI), Bloomington-Normal (BMI)
Search flight deals

  • 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
9,089 reviews
Search United Airlines flights
American AirlinesPriceFrom $363Free CancellationRating
7.2
11,045 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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