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

United Airlines, Frontier, and Southwest 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?

134 flights are operational daily from Chicago O'Hare Intl Airport to Illinois as of May 2026. The most popular departure time for this route is 10:00PM, with 39% 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 May 2026, 944 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 Fri, with 16% 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 May 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.

$59 Cheap Flights from Chicago O'Hare Intl Airport to Illinois in 2026

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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.

12:15 pm - 1:35 pm

ORD

BRL

1h 20mnonstop

9:10 am - 10:35 am

BRL

ORD

1h 25mnonstop

$78Contour

Thu, Jun 11 - Wed, Jun 17

6:45 pm - 8:05 pm

ORD

BRL

1h 20mnonstop

4:40 pm - 6:05 pm

BRL

ORD

1h 25mnonstop

$79Contour

Wed, May 27 - Sun, May 31

12:00 pm - 1:20 pm

ORD

BRL

1h 20mnonstop

9:10 am - 10:35 am

BRL

ORD

1h 25mnonstop

$80Contour

Wed, May 27 - Sun, May 31

7:45 am - 8:57 am

ORD

DEC

1h 12mnonstop

6:45 pm - 7:53 pm

DEC

ORD

1h 08mnonstop

$149United Airlines

Thu, Jun 11 - Thu, Jun 18

7:45 am - 8:57 am

ORD

DEC

1h 12mnonstop

6:45 pm - 7:53 pm

DEC

ORD

1h 08mnonstop

$159United Airlines

Thu, Jul 2 - Sat, Jul 4

10:05 am - 11:11 am

ORD

CMI

1h 06mnonstop

6:40 pm - 8:12 pm

CMI

ORD

1h 32mnonstop

$228American Airlines

Tue, Aug 18 - Sat, Aug 22

10:00 am - 11:07 am

ORD

CMI

1h 07mnonstop

6:12 am - 7:30 am

CMI

ORD

1h 18mnonstop

$229American Airlines

Sun, May 31 - Sat, Jun 6

5:11 pm - 11:57 pm

ORD

STL

6h 46m

1 stop

4:19 pm - 11:13 pm

STL

ORD

6h 54m

1 stop

$250Frontier

Thu, May 28 - Fri, May 29

9:37 pm - 7:23 pm

ORD

STL

21h 46m

1 stop

11:24 am - 11:13 pm

STL

ORD

11h 49m

1 stop

$251Frontier

Thu, May 28 - Mon, Jun 1

2:07 pm - 8:39 pm

ORD

STL

6h 32m

1 stop

1:59 pm - 8:31 pm

STL

ORD

6h 32m

1 stop

$257Delta

Fri, Jun 12 - Tue, Jun 16

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

Jun 18

ORD6:55 amChicago O'Hare Intl

10h 35m

1 stop

STL5:30 pmLambert-St Louis

Jun 25

STL2:56 pmLambert-St Louis

14h 11m

1 stop

ORD5:07 amChicago O'Hare Intl

$249

Frontier

May 28

ORD5:11 pmChicago O'Hare Intl

6h 46m

1 stop

STL11:57 pmLambert-St Louis

May 29

STL4:19 pmLambert-St Louis

6h 54m

1 stop

ORD11:13 pmChicago O'Hare Intl

$250

Frontier

May 28

ORD9:37 pmChicago O'Hare Intl

21h 46m

1 stop

STL7:23 pmLambert-St Louis

Jun 1

STL11:24 amLambert-St Louis

11h 49m

1 stop

ORD11:13 pmChicago O'Hare Intl

$251

Delta flights from Chicago O'Hare Intl Airport to Illinois

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

Delta

Jun 17

ORD8:52 amChicago O'Hare Intl

4h 17m

1 stop

STL1:09 pmLambert-St Louis

Jun 21

STL6:30 amLambert-St Louis

4h 20m

1 stop

ORD10:50 amChicago O'Hare Intl

$257

Delta

May 28

ORD9:25 amChicago O'Hare Intl

7h 21m

2 stops

STL4:46 pmLambert-St Louis

Jun 10

STL8:49 amLambert-St Louis

9h 40m

2 stops

ORD6:29 pmChicago O'Hare Intl

$267

Delta

Jun 10

ORD8:52 amChicago O'Hare Intl

4h 17m

1 stop

STL1:09 pmLambert-St Louis

Jun 11

STL10:20 amLambert-St Louis

6h 06m

1 stop

ORD4:26 pmChicago O'Hare Intl

$268

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 - BRL

ORDBRL

Chicago O'Hare Intl

Thu 6/11

12:15 pm-1:35 pm

Nonstop1h 20m

Burlington

Wed 6/17

9:10 am-10:35 am

Nonstop1h 25m

$78

ChicagoBurlington

ORD - BRL

ORDBRL

Chicago O'Hare Intl

Wed 5/27

6:45 pm-8:05 pm

Nonstop1h 20m

Burlington

Sun 5/31

4:40 pm-6:05 pm

Nonstop1h 25m

$79

ChicagoBurlington

ORD - BRL

ORDBRL

Chicago O'Hare Intl

Wed 5/27

12:00 pm-1:20 pm

Nonstop1h 20m

Burlington

Sun 5/31

9:10 am-10:35 am

Nonstop1h 25m

$80

Quickest round-trip

ChicagoDecatur

ORD - DEC

ORDDEC

Chicago O'Hare Intl

Thu 6/11

7:45 am-8:57 am

Nonstop1h 12m

Decatur Arpt

Thu 6/18

6:45 pm-7:53 pm

Nonstop1h 08m

$149

ChicagoDecatur

ORD - DEC

ORDDEC

Chicago O'Hare Intl

Thu 7/2

7:45 am-8:57 am

Nonstop1h 12m

Decatur Arpt

Sat 7/4

6:45 pm-7:53 pm

Nonstop1h 08m

$159

ChicagoChampaign

ORD - CMI

ORDCMI

Chicago O'Hare Intl

Tue 8/18

10:05 am-11:11 am

Nonstop1h 06m

Champaign University-Willard

Sat 8/22

6:40 pm-8:12 pm

Nonstop1h 32m

$228

ChicagoChampaign

ORD - CMI

ORDCMI

Chicago O'Hare Intl

Sun 5/31

10:00 am-11:07 am

Nonstop1h 07m

Champaign University-Willard

Sat 6/6

6:12 am-7:30 am

Nonstop1h 18m

$229

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 5/28

5:11 pm-11:57 pm

1 stop6h 46m

Lambert-St Louis

Fri 5/29

4:19 pm-11:13 pm

1 stop6h 54m

$250

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 5/28

9:37 pm-7:23 pm

1 stop21h 46m

Lambert-St Louis

Mon 6/1

11:24 am-11:13 pm

1 stop11h 49m

$251

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Fri 6/12

2:07 pm-8:39 pm

1 stop6h 32m

Lambert-St Louis

Tue 6/16

1:59 pm-8:31 pm

1 stop6h 32m

$257

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 $121, 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 January is also cheap. Prices for this month can be found on momondo for an average of $128.

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

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	$181
Fastest flight time	1h 01m
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 $181. The best round-trip flight deal from Chicago O'Hare Intl Airport to Illinois found on momondo in the last 72 hours is $146.

The fastest flight from Chicago O'Hare Intl Airport to Illinois takes 1h 01m

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), Evansville Dress Regional (EVV), Greater Peoria (PIA), Lambert-St Louis (STL) and 5 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 May 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 (18.75% of total bookings). The next most popular plane models are Embraer 170 (13.28%), Canadair (Bombardier) Regional Jet 700 (10.94%), and Airbus A319 (10.55%).

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 11,662 reviews		Search American Airlines flights
United Airlines	PriceFrom $179	Free Cancellation	Rating 7.4 9,717 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.