What is the cheapest airline that flies from Chicago O'Hare Intl to Illinois?

Contour, United Airlines, and Delta are the most popular carriers operating from Chicago O'Hare Intl to Illinois

How many flights depart from Chicago O'Hare Intl Airport to Illinois on average per day?

93 flights are operational daily from Chicago O'Hare Intl Airport to Illinois as of August 2026. The most popular departure time for this route is 11:00PM, with 43% of flights per day taking off in the evening.

How many flights depart from Chicago O'Hare Intl Airport to Illinois on average per week?

As of August 2026, 653 flights take off from Chicago O'Hare Intl Airport and land in Illinois each week. The most common flight departure day for this route is Mon, with 20% of weekly flights taking off on this day.

When did momondo last update prices for flights from Chicago O'Hare Intl Airport to Illinois?

Prices for flights from Chicago O'Hare Intl Airport to Illinois are updated daily.

How many operators does momondo search for flights from Chicago O'Hare Intl Airport to Illinois?

There are 4 operators available for flights from Chicago O'Hare Intl Airport to Illinois as of August 2026.

How old do you have to be to fly from Chicago O'Hare Intl Airport to Illinois?

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Chicago O'Hare Intl Airport to Illinois.

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

The travel and health documents you'll need for your trip to Illinois may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Illinois. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$48 Cheap Flights from Chicago O'Hare Intl Airport to Illinois in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Chicago O'Hare Intl Airport to Illinois

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

12:20 pm - 1:45 pmORD Chicago O'Hare Intl-BRL Burlington

1h 25mnonstop

9:00 am - 10:35 amBRL Burlington-ORD Chicago O'Hare Intl

1h 35mnonstop

$90Contour

Fri, Sep 11 - Fri, Sep 18

5:50 pm - 7:15 pmORD Chicago O'Hare Intl-BRL Burlington

1h 25mnonstop

3:35 pm - 5:10 pmBRL Burlington-ORD Chicago O'Hare Intl

1h 35mnonstop

$91Contour

Wed, Sep 16 - Wed, Sep 23

6:00 pm - 7:25 pmORD Chicago O'Hare Intl-BRL Burlington

1h 25mnonstop

3:45 pm - 5:20 pmBRL Burlington-ORD Chicago O'Hare Intl

1h 35mnonstop

$91Contour

Fri, Oct 2 - Mon, Oct 5

5:30 pm - 6:44 pmORD Chicago O'Hare Intl-DEC Decatur Arpt

1h 14mnonstop

7:20 pm - 8:37 pmDEC Decatur Arpt-ORD Chicago O'Hare Intl

1h 17mnonstop

$149United Airlines

Tue, Sep 15 - Tue, Sep 22

5:29 pm - 6:43 pmORD Chicago O'Hare Intl-DEC Decatur Arpt

1h 14mnonstop

7:20 pm - 8:37 pmDEC Decatur Arpt-ORD Chicago O'Hare Intl

1h 17mnonstop

$149United Airlines

Mon, Sep 14 - Mon, Sep 21

6:55 am - 8:05 amORD Chicago O'Hare Intl-DEC Decatur Arpt

1h 10mnonstop

9:13 am - 10:30 amDEC Decatur Arpt-ORD Chicago O'Hare Intl

1h 17mnonstop

$159United Airlines

Sun, Sep 13 - Sun, Sep 20

11:19 am - 5:19 pmORD Chicago O'Hare Intl-STL Lambert-St Louis

6h 00m1 stop Detroit Metropolitan Wayne County

6:47 am - 12:59 pmSTL Lambert-St Louis-ORD Chicago O'Hare Intl

6h 12m1 stop Detroit Metropolitan Wayne County

$164Delta

Wed, Oct 28 - Fri, Oct 30

7:05 am - 5:22 pmORD Chicago O'Hare Intl-STL Lambert-St Louis

10h 17m1 stop Atlanta Hartsfield-Jackson

6:17 pm - 7:53 amSTL Lambert-St Louis-ORD Chicago O'Hare Intl

13h 36m1 stop Atlanta Hartsfield-Jackson

$176Frontier

Thu, Sep 3 - Sun, Sep 6

9:30 am - 10:51 amORD Chicago O'Hare Intl-STL Lambert-St Louis

1h 21mnonstop

5:00 am - 6:26 amSTL Lambert-St Louis-ORD Chicago O'Hare Intl

1h 26mnonstop

$186American Airlines

Mon, Jan 18 - Tue, Jan 26

9:30 am - 10:51 amORD Chicago O'Hare Intl-STL Lambert-St Louis

1h 21mnonstop

11:31 am - 12:59 pmSTL Lambert-St Louis-ORD Chicago O'Hare Intl

1h 28mnonstop

$186American Airlines

Mon, Jan 18 - Sat, Jan 23

Cheap last minute flights

Enter your travel dates to find the best prices.

4:45 pm - 5:59 pmORD Chicago O'Hare Intl-DEC Decatur Arpt

1h 14mnonstop

7:20 pm - 8:37 pmDEC Decatur Arpt-ORD Chicago O'Hare Intl

1h 17mnonstop

$174United Airlines

Sat, Aug 22 - Sat, Aug 29

5:50 pm - 7:15 pmORD Chicago O'Hare Intl-BRL Burlington

1h 25mnonstop

9:00 am - 10:35 amBRL Burlington-ORD Chicago O'Hare Intl

1h 35mnonstop

$189Contour

Fri, Aug 21 - Sun, Aug 23

12:20 pm - 1:45 pmORD Chicago O'Hare Intl-BRL Burlington

1h 25mnonstop

3:35 pm - 5:10 pmBRL Burlington-ORD Chicago O'Hare Intl

1h 35mnonstop

$208Contour

Fri, Aug 21 - Fri, Aug 28

4:45 pm - 5:59 pmORD Chicago O'Hare Intl-DEC Decatur Arpt

1h 14mnonstop

7:20 pm - 8:37 pmDEC Decatur Arpt-ORD Chicago O'Hare Intl

1h 17mnonstop

$291United Airlines

Fri, Aug 21 - Sat, Aug 22

9:30 pm - 10:43 pmORD Chicago O'Hare Intl-PIA Greater Peoria

1h 13mnonstop

3:35 pm - 5:05 pmPIA Greater Peoria-ORD Chicago O'Hare Intl

1h 30mnonstop

$294United Airlines

Sat, Aug 22 - Sat, Aug 29

8:11 pm - 5:50 pmORD Chicago O'Hare Intl-STL Lambert-St Louis

21h 39m1 stop Las Vegas Harry Reid Intl

7:58 pm - 1:36 pmSTL Lambert-St Louis-ORD Chicago O'Hare Intl

17h 38m1 stop Denver Intl

$330Frontier

Sun, Aug 23 - Sun, Aug 30

7:05 am - 5:22 pmORD Chicago O'Hare Intl-STL Lambert-St Louis

10h 17m1 stop Atlanta Hartsfield-Jackson

4:23 pm - 11:08 pmSTL Lambert-St Louis-ORD Chicago O'Hare Intl

6h 45m1 stop Orlando

$340Frontier

Fri, Aug 21 - Mon, Aug 24

9:10 pm - 4:11 pmORD Chicago O'Hare Intl-STL Lambert-St Louis

19h 01m1 stop Orlando

7:58 pm - 1:36 pmSTL Lambert-St Louis-ORD Chicago O'Hare Intl

17h 38m1 stop Denver Intl

$360Frontier

Fri, Aug 21 - Sun, Aug 23

7:22 pm - 8:28 pmORD Chicago O'Hare Intl-CMI Champaign University-Willard

1h 06mnonstop

6:41 pm - 8:18 pmCMI Champaign University-Willard-ORD Chicago O'Hare Intl

1h 37mnonstop

$454American Airlines

Sat, Aug 22 - Fri, Sep 18

7:00 am - 8:24 amORD Chicago O'Hare Intl-STL Lambert-St Louis

1h 24mnonstop

1:25 pm - 3:01 pmSTL Lambert-St Louis-ORD Chicago O'Hare Intl

1h 36mnonstop

$456American Airlines

Mon, Aug 24 - Wed, Aug 26

Cheap direct flights

Enter your travel dates to find the best prices.

12:20 pm - 1:45 pmORD Chicago O'Hare Intl-BRL Burlington

1h 25mnonstop

9:00 am - 10:35 amBRL Burlington-ORD Chicago O'Hare Intl

1h 35mnonstop

$90Contour

Fri, Sep 11 - Fri, Sep 18

6:00 pm - 7:25 pmORD Chicago O'Hare Intl-BRL Burlington

1h 25mnonstop

3:45 pm - 5:20 pmBRL Burlington-ORD Chicago O'Hare Intl

1h 35mnonstop

$91Contour

Fri, Oct 2 - Mon, Oct 5

5:50 pm - 7:15 pmORD Chicago O'Hare Intl-BRL Burlington

1h 25mnonstop

3:35 pm - 5:10 pmBRL Burlington-ORD Chicago O'Hare Intl

1h 35mnonstop

$91Contour

Wed, Sep 16 - Wed, Sep 23

5:50 pm - 7:15 pmORD Chicago O'Hare Intl-BRL Burlington

1h 25mnonstop

3:35 pm - 5:10 pmBRL Burlington-ORD Chicago O'Hare Intl

1h 35mnonstop

$98Contour

Thu, Sep 3 - Sun, Sep 6

5:30 pm - 6:44 pmORD Chicago O'Hare Intl-DEC Decatur Arpt

1h 14mnonstop

7:20 pm - 8:37 pmDEC Decatur Arpt-ORD Chicago O'Hare Intl

1h 17mnonstop

$149United Airlines

Tue, Sep 15 - Tue, Sep 22

5:29 pm - 6:43 pmORD Chicago O'Hare Intl-DEC Decatur Arpt

1h 14mnonstop

7:20 pm - 8:37 pmDEC Decatur Arpt-ORD Chicago O'Hare Intl

1h 17mnonstop

$149United Airlines

Mon, Sep 14 - Mon, Sep 21

4:45 pm - 5:59 pmORD Chicago O'Hare Intl-DEC Decatur Arpt

1h 14mnonstop

9:12 am - 10:29 amDEC Decatur Arpt-ORD Chicago O'Hare Intl

1h 17mnonstop

$159United Airlines

Sat, Sep 5 - Sun, Sep 6

9:30 am - 10:51 amORD Chicago O'Hare Intl-STL Lambert-St Louis

1h 21mnonstop

5:00 am - 6:26 amSTL Lambert-St Louis-ORD Chicago O'Hare Intl

1h 26mnonstop

$186American Airlines

Mon, Jan 18 - Thu, Jan 21

9:30 am - 10:51 amORD Chicago O'Hare Intl-STL Lambert-St Louis

1h 21mnonstop

5:00 am - 6:26 amSTL Lambert-St Louis-ORD Chicago O'Hare Intl

1h 26mnonstop

$186American Airlines

Mon, Jan 18 - Wed, Jan 20

11:00 pm - 12:08 amORD Chicago O'Hare Intl-PIA Greater Peoria

1h 08mnonstop

5:33 pm - 6:57 pmPIA Greater Peoria-ORD Chicago O'Hare Intl

1h 24mnonstop

$249American Airlines

Mon, Sep 28 - Mon, Oct 5

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United Airlines flights from Chicago O'Hare Intl Airport to Illinois

Our best United Airlines deals on Chicago O'Hare Intl Airport to Illinois flight tickets

United Airlines

Sep 14

ORD5:29 pmChicago O'Hare Intl

1h 14m

DEC6:43 pmDecatur Arpt

Sep 21

DEC7:20 pmDecatur Arpt

1h 17m

ORD8:37 pmChicago O'Hare Intl

$149

United Airlines

Sep 5

ORD4:45 pmChicago O'Hare Intl

1h 14m

DEC5:59 pmDecatur Arpt

Sep 6

DEC9:12 amDecatur Arpt

1h 17m

ORD10:29 amChicago O'Hare Intl

$159

United Airlines

Aug 22

ORD4:45 pmChicago O'Hare Intl

1h 14m

DEC5:59 pmDecatur Arpt

Aug 29

DEC7:20 pmDecatur Arpt

1h 17m

ORD8:37 pmChicago O'Hare Intl

$174

Frontier flights from Chicago O'Hare Intl Airport to Illinois

Our best Frontier deals on Chicago O'Hare Intl Airport to Illinois flight tickets

Frontier

Sep 3

ORD7:05 amChicago O'Hare Intl

10h 17m

1 stop

STL5:22 pmLambert-St Louis

Sep 6

STL6:17 pmLambert-St Louis

13h 36m

1 stop

ORD7:53 amChicago O'Hare Intl

$176

Frontier

Oct 9

ORD10:26 amChicago O'Hare Intl

7h 14m

1 stop

STL5:40 pmLambert-St Louis

Oct 14

STL4:19 pmLambert-St Louis

8h 05m

1 stop

ORD12:24 amChicago O'Hare Intl

$180

Frontier

Sep 14

ORD12:26 pmChicago O'Hare Intl

6h 51m

1 stop

STL7:17 pmLambert-St Louis

Sep 21

STL8:10 pmLambert-St Louis

28h 13m

1 stop

ORD12:23 amChicago O'Hare Intl

$181

momondo Fare Finder

Use the filters below to find and compare flights from Chicago O'Hare Intl Airport to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoBurlington

ORD Chicago O'Hare Intl - BRL Burlington

ORDBRL

Chicago O'Hare Intl

Fri 9/11

12:20 pm-1:45 pm

Nonstop1h 25m

Burlington

Fri 9/18

9:00 am-10:35 am

Nonstop1h 35m

$90

ChicagoBurlington

ORD Chicago O'Hare Intl - BRL Burlington

ORDBRL

Chicago O'Hare Intl

Wed 9/16

5:50 pm-7:15 pm

Nonstop1h 25m

Burlington

Wed 9/23

3:35 pm-5:10 pm

Nonstop1h 35m

$91

ChicagoBurlington

ORD Chicago O'Hare Intl - BRL Burlington

ORDBRL

Chicago O'Hare Intl

Fri 10/2

6:00 pm-7:25 pm

Nonstop1h 25m

Burlington

Mon 10/5

3:45 pm-5:20 pm

Nonstop1h 35m

$91

ChicagoDecatur

ORD Chicago O'Hare Intl - DEC Decatur Arpt

ORDDEC

Chicago O'Hare Intl

Tue 9/15

5:30 pm-6:44 pm

Nonstop1h 14m

Decatur Arpt

Tue 9/22

7:20 pm-8:37 pm

Nonstop1h 17m

$149

ChicagoDecatur

ORD Chicago O'Hare Intl - DEC Decatur Arpt

ORDDEC

Chicago O'Hare Intl

Mon 9/14

5:29 pm-6:43 pm

Nonstop1h 14m

Decatur Arpt

Mon 9/21

7:20 pm-8:37 pm

Nonstop1h 17m

$149

Quickest round-trip

ChicagoDecatur

ORD Chicago O'Hare Intl - DEC Decatur Arpt

ORDDEC

Chicago O'Hare Intl

Sun 9/13

6:55 am-8:05 am

Nonstop1h 10m

Decatur Arpt

Sun 9/20

9:13 am-10:30 am

Nonstop1h 17m

$159

ChicagoSt. Louis

ORD Chicago O'Hare Intl - STL Lambert-St Louis

ORDSTL

Chicago O'Hare Intl

Wed 10/28

11:19 am-5:19 pm

1 stop6h 00m

Lambert-St Louis

Fri 10/30

6:47 am-12:59 pm

1 stop6h 12m

$164

ChicagoSt. Louis

ORD Chicago O'Hare Intl - STL Lambert-St Louis

ORDSTL

Chicago O'Hare Intl

Thu 9/3

7:05 am-5:22 pm

1 stop10h 17m

Lambert-St Louis

Sun 9/6

6:17 pm-7:53 am

1 stop13h 36m

$176

ChicagoSt. Louis

ORD Chicago O'Hare Intl - STL Lambert-St Louis

ORDSTL

Chicago O'Hare Intl

Mon 1/18

9:30 am-10:51 am

Nonstop1h 21m

Lambert-St Louis

Tue 1/26

5:00 am-6:26 am

Nonstop1h 26m

$186

ChicagoSt. Louis

ORD Chicago O'Hare Intl - STL Lambert-St Louis

ORDSTL

Chicago O'Hare Intl

Mon 1/18

9:30 am-10:51 am

Nonstop1h 21m

Lambert-St Louis

Sat 1/23

11:31 am-12:59 pm

Nonstop1h 28m

$186

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Chicago O'Hare Intl Airport 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

Prices

Airlines

Other information

What is the cheapest month to fly to Illinois?

The cheapest month to fly to Illinois from Chicago O'Hare Intl Airport is in April. Flight prices, which tend to average around $179, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of April, then flying in June is also cheap. Prices for this month can be found on momondo for an average of $238.

What is the cheapest Chicago O'Hare Intl to Illinois flight route?

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

What cabin class options are available on Chicago O'Hare Intl Airport to Illinois flights?

There are 3 cabin classes available to choose from on Chicago O'Hare Intl Airport 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 O'Hare Intl Airport to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Chicago O'Hare Intl Airport to Illinois

Best Price Found	$48
Fastest flight time	0h 58m
Direct flights	Every day
Airports in Illinois	98 airports

The best one-way flight to Illinois from Chicago O'Hare Intl Airport in the past 72 hours is $48. The best round-trip flight deal from Chicago O'Hare Intl Airport to Illinois found on momondo in the last 72 hours is $90.

The fastest flight from Chicago O'Hare Intl Airport to Illinois takes 0h 58m

Direct flights go from Chicago O'Hare Intl Airport to Illinois every day.

There are 98 airports in Illinois. From Chicago O'Hare Intl Airport there are direct flights to Decatur Arpt (DEC), Greater Peoria (PIA), Lambert-St Louis (STL), Moline Quad-City (MLI) and 3 more.

Search flight deals

Frequently asked questions about flying from Chicago O'Hare Intl Airport to Illinois

When did momondo last update prices for flights from Chicago O'Hare Intl Airport to Illinois?
Prices for flights from Chicago O'Hare Intl Airport to Illinois are updated daily.
How many operators does momondo search for flights from Chicago O'Hare Intl Airport to Illinois?
There are 4 operators available for flights from Chicago O'Hare Intl Airport to Illinois as of August 2026.
How old do you have to be to fly from Chicago O'Hare Intl Airport to Illinois?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Chicago O'Hare Intl Airport to Illinois.
What documentation or ID do you need to fly to Illinois?
The travel and health documents you'll need for your trip to Illinois may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Illinois. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Chicago O'Hare Intl Airport to Illinois?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Chicago O'Hare Intl Airport to Illinois is Canadair (Bombardier) Regional Jet (13.77% of total bookings). The next most popular plane models are Embraer 170 (12.15%), Airbus A319 (9.72%), and Embraer 175 (9.31%).

Best airlines flying from Chicago O'Hare Intl Airport to Illinois

Compare and see reviews for airlines that fly from Chicago O'Hare Intl Airport to Illinois with momondo

Airline	Rating	Free Cancellation	Price
American Airlines	PriceFrom $168	Free Cancellation	Rating 7.1 11,961 reviews		Search American Airlines flights
United Airlines	PriceFrom $179	Free Cancellation	Rating 7.4 10,104 reviews		Search United Airlines flights

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Chicago to Illinois for you.

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

Flights from Chicago to Illinois with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

momondo provides multiple filters to help you find the best flight to Illinois from Chicago. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Yes momondo offers price alerts on flights to Illinois from Chicago. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.