What is the cheapest airline that flies from Chicago to Illinois?

Contour, Southwest, and United Airlines are the most popular carriers operating from Chicago to Illinois

How many flights depart from Chicago to Illinois on average per day?

As of August 2026, there are 88 flights per day flying from Chicago to Illinois. The most common time of day flights depart is 11:00PM, with 40% of flights taking off in the afternoon.

How many flights depart from Chicago to Illinois on average per week?

619 flights are operational weekly from Chicago to Illinois as of August 2026. The most popular departure day for this route is Sun, with 21% of flights per week taking off on this day.

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?

The number of operators available for flights from Chicago to Illinois is 5 as of August 2026.

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.

$48 Cheap Flights from Chicago to Illinois in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Chicago 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

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

1h 35mnonstop

$94Contour

Fri, Nov 6 - Mon, Nov 9

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

$95Contour

Sun, Oct 25 - Wed, Oct 28

5:59 am - 7:09 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

$149United Airlines

Wed, Sep 2 - Wed, Sep 9

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

$159United Airlines

Fri, Aug 21 - Tue, Aug 25

8:29 am - 1:53 pmORD Chicago O'Hare Intl-STL Lambert-St Louis

5h 24m1 stop Detroit Metropolitan Wayne County

10:14 am - 1:59 pmSTL Lambert-St Louis-ORD Chicago O'Hare Intl

3h 45m1 stop Detroit Metropolitan Wayne County

$164Delta

Thu, Oct 29 - Thu, Nov 26

6:00 pm - 10:03 pmORD Chicago O'Hare Intl-STL Lambert-St Louis

4h 03m1 stop Minneapolis St Paul

6:30 am - 10:42 amSTL Lambert-St Louis-ORD Chicago O'Hare Intl

4h 12m1 stop Detroit Metropolitan Wayne County

$164Delta

Sat, Sep 5 - Sun, Sep 6

12:35 pm - 4:45 pmMDW Chicago Midway-STL Lambert-St Louis

4h 10m1 stop Nashville Intl

10:20 am - 2:15 pmSTL Lambert-St Louis-MDW Chicago Midway

3h 55m1 stop Pittsburgh

$171Southwest

Tue, Sep 29 - Thu, Oct 1

7:40 am - 1:30 pmMDW Chicago Midway-STL Lambert-St Louis

5h 50m1 stop Raleigh-Durham

3:00 pm - 7:35 pmSTL Lambert-St Louis-MDW Chicago Midway

4h 35m1 stop Washington, D.C. Reagan-National

$171Southwest

Sat, Aug 29 - Sat, Aug 29

2:56 pm - 4:20 pmORD Chicago O'Hare Intl-STL Lambert-St Louis

1h 24mnonstop

9:32 am - 11:00 amSTL Lambert-St Louis-ORD Chicago O'Hare Intl

1h 28mnonstop

$184American Airlines

Fri, Sep 4 - Sun, Sep 6

8:55 am - 10:18 amORD Chicago O'Hare Intl-STL Lambert-St Louis

1h 23mnonstop

7:27 am - 9:05 amSTL Lambert-St Louis-ORD Chicago O'Hare Intl

1h 38mnonstop

$200American Airlines

Fri, Sep 25 - Sat, Sep 26

Cheap last minute flights

Enter your travel dates to find the best prices.

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

$195Contour

Fri, Aug 14 - Sun, Aug 16

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

$197Contour

Thu, Aug 13 - Fri, Aug 14

1:55 pm - 3:09 pmORD Chicago O'Hare Intl-MLI Moline Quad-City

1h 14mnonstop

5:40 am - 6:58 amMLI Moline Quad-City-ORD Chicago O'Hare Intl

1h 18mnonstop

$294United Airlines

Fri, Aug 14 - Fri, Aug 21

11:00 pm - 12:08 amORD Chicago O'Hare Intl-MLI Moline Quad-City

1h 08mnonstop

6:45 pm - 8:15 pmMLI Moline Quad-City-ORD Chicago O'Hare Intl

1h 30mnonstop

$294American Airlines

Sat, Aug 15 - Sun, Aug 23

9:57 pm - 7:23 pmORD Chicago O'Hare Intl-STL Lambert-St Louis

21h 26m1 stop Denver Intl

2:29 pm - 6:23 pmSTL Lambert-St Louis-ORD Chicago O'Hare Intl

27h 54m1 stop Atlanta Hartsfield-Jackson

$308Frontier

Wed, Aug 12 - Fri, Sep 18

5:13 pm - 11:59 pmORD Chicago O'Hare Intl-STL Lambert-St Louis

6h 46m1 stop Orlando

7:10 pm - 5:37 amSTL Lambert-St Louis-ORD Chicago O'Hare Intl

10h 27m1 stop Las Vegas Harry Reid Intl

$320Frontier

Sat, Aug 15 - Sun, Aug 16

8:45 am - 10:06 amORD Chicago O'Hare Intl-PIA Greater Peoria

1h 21mnonstop

5:45 am - 6:58 amPIA Greater Peoria-ORD Chicago O'Hare Intl

1h 13mnonstop

$359United Airlines

Fri, Aug 14 - Mon, Aug 17

10:10 am - 11:20 amMDW Chicago Midway-STL Lambert-St Louis

1h 10mnonstop

8:50 pm - 10:00 pmSTL Lambert-St Louis-MDW Chicago Midway

1h 10mnonstop

$368Southwest

Wed, Aug 12 - Fri, Sep 18

11:53 am - 4:25 pmORD Chicago O'Hare Intl-STL Lambert-St Louis

4h 32m1 stop Charlotte Douglas

5:00 am - 6:29 amSTL Lambert-St Louis-ORD Chicago O'Hare Intl

1h 29mnonstop

$378American Airlines

Wed, Aug 12 - Fri, Sep 18

8:15 am - 9:35 amMDW Chicago Midway-STL Lambert-St Louis

1h 20mnonstop

2:25 pm - 6:55 pmSTL Lambert-St Louis-MDW Chicago Midway

4h 30m1 stop Kansas City

$378Southwest

Wed, Aug 12 - Fri, Sep 18

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

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

1h 35mnonstop

$94Contour

Fri, Nov 6 - Mon, Nov 9

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

$95Contour

Sun, Oct 25 - Wed, Oct 28

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

$95Contour

Sun, Nov 1 - Mon, Nov 30

5:59 am - 7:09 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

$149United Airlines

Wed, Sep 2 - Wed, Sep 9

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

$159United Airlines

Fri, Aug 21 - Tue, Aug 25

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

1h 14mnonstop

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

1h 17mnonstop

$160United Airlines

Sat, Sep 12 - Sun, Sep 13

2:56 pm - 4:20 pmORD Chicago O'Hare Intl-STL Lambert-St Louis

1h 24mnonstop

9:32 am - 11:00 amSTL Lambert-St Louis-ORD Chicago O'Hare Intl

1h 28mnonstop

$184American Airlines

Fri, Sep 4 - Sun, Sep 6

8:55 am - 10:18 amORD Chicago O'Hare Intl-STL Lambert-St Louis

1h 23mnonstop

5:18 pm - 7:13 pmSTL Lambert-St Louis-ORD Chicago O'Hare Intl

1h 55mnonstop

$200American Airlines

Fri, Sep 18 - Tue, Sep 22

6:30 am - 7:45 amMDW Chicago Midway-STL Lambert-St Louis

1h 15mnonstop

10:55 am - 12:05 pmSTL Lambert-St Louis-MDW Chicago Midway

1h 10mnonstop

$200Southwest

Fri, Nov 13 - Tue, Nov 17

10:05 pm - 11:15 pmMDW Chicago Midway-STL Lambert-St Louis

1h 10mnonstop

5:25 am - 6:30 amSTL Lambert-St Louis-MDW Chicago Midway

1h 05mnonstop

$200Southwest

Fri, Oct 16 - Mon, Oct 19

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Southwest flights from Chicago to Illinois

Our best Southwest deals on Chicago to Illinois flight tickets

Southwest

Aug 29

MDW7:40 amChicago Midway

5h 50m

1 stop

STL1:30 pmLambert-St Louis

Aug 29

STL3:00 pmLambert-St Louis

4h 35m

1 stop

MDW7:35 pmChicago Midway

$171

Southwest

Sep 25

MDW8:55 pmChicago Midway

1h 15m

STL10:10 pmLambert-St Louis

Sep 26

STL8:25 amLambert-St Louis

1h 05m

MDW9:30 amChicago Midway

$200

Southwest

Sep 4

MDW4:25 pmChicago Midway

3h 30m

1 stop

STL7:55 pmLambert-St Louis

Sep 11

STL5:30 pmLambert-St Louis

5h 25m

1 stop

MDW10:55 pmChicago Midway

$203

Frontier flights from Chicago to Illinois

Our best Frontier deals on Chicago to Illinois flight tickets

Frontier

Sep 18

ORD8:55 pmChicago O'Hare Intl

14h 37m

1 stop

STL11:32 amLambert-St Louis

Sep 22

STL12:17 pmLambert-St Louis

17h 21m

1 stop

ORD5:38 amChicago O'Hare Intl

$166

Frontier

Oct 7

ORD7:28 pmChicago O'Hare Intl

14h 12m

1 stop

STL9:40 amLambert-St Louis

Oct 12

STL10:35 amLambert-St Louis

21h 40m

1 stop

ORD8:15 amChicago O'Hare Intl

$183

Frontier

Oct 7

ORD7:28 pmChicago O'Hare Intl

14h 12m

1 stop

STL9:40 amLambert-St Louis

Oct 15

STL10:35 amLambert-St Louis

9h 53m

1 stop

ORD8:28 pmChicago O'Hare Intl

$185

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 11/6

12:20 pm-1:45 pm

Nonstop1h 25m

Burlington

Mon 11/9

3:45 pm-5:20 pm

Nonstop1h 35m

$94

ChicagoBurlington

ORD Chicago O'Hare Intl - BRL Burlington

ORDBRL

Chicago O'Hare Intl

Sun 10/25

12:20 pm-1:45 pm

Nonstop1h 25m

Burlington

Wed 10/28

9:00 am-10:35 am

Nonstop1h 35m

$95

Quickest round-trip

ChicagoDecatur

ORD Chicago O'Hare Intl - DEC Decatur Arpt

ORDDEC

Chicago O'Hare Intl

Wed 9/2

5:59 am-7:09 am

Nonstop1h 10m

Decatur Arpt

Wed 9/9

9:13 am-10:30 am

Nonstop1h 17m

$149

ChicagoDecatur

ORD Chicago O'Hare Intl - DEC Decatur Arpt

ORDDEC

Chicago O'Hare Intl

Fri 8/21

4:45 pm-5:59 pm

Nonstop1h 14m

Decatur Arpt

Tue 8/25

7:20 pm-8:37 pm

Nonstop1h 17m

$159

ChicagoSt. Louis

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

ORDSTL

Chicago O'Hare Intl

Thu 10/29

8:29 am-1:53 pm

1 stop5h 24m

Lambert-St Louis

Thu 11/26

10:14 am-1:59 pm

1 stop3h 45m

$164

ChicagoSt. Louis

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

ORDSTL

Chicago O'Hare Intl

Sat 9/5

6:00 pm-10:03 pm

1 stop4h 03m

Lambert-St Louis

Sun 9/6

6:30 am-10:42 am

1 stop4h 12m

$164

ChicagoSt. Louis

MDW Chicago Midway - STL Lambert-St Louis

MDWSTL

Chicago Midway

Tue 9/29

12:35 pm-4:45 pm

1 stop4h 10m

Lambert-St Louis

Thu 10/1

10:20 am-2:15 pm

1 stop3h 55m

$171

ChicagoSt. Louis

MDW Chicago Midway - STL Lambert-St Louis

MDWSTL

Chicago Midway

Sat 8/29

7:40 am-1:30 pm

1 stop5h 50m

Lambert-St Louis

Sat 8/29

3:00 pm-7:35 pm

1 stop4h 35m

$171

ChicagoSt. Louis

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

ORDSTL

Chicago O'Hare Intl

Fri 9/4

2:56 pm-4:20 pm

Nonstop1h 24m

Lambert-St Louis

Sun 9/6

9:32 am-11:00 am

Nonstop1h 28m

$184

ChicagoSt. Louis

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

ORDSTL

Chicago O'Hare Intl

Fri 9/25

8:55 am-10:18 am

Nonstop1h 23m

Lambert-St Louis

Sat 9/26

7:27 am-9:05 am

Nonstop1h 38m

$200

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 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 is in December. Flight prices, which tend to average around $149, 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 December, then flying in August is also cheap. Prices for this month can be found on momondo for an average of $179.

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 3 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	$83
Fastest flight time	0h 56m
Direct flights	Every day
Airports in Illinois	98 airports

The best one-way flight to Illinois from Chicago in the past 72 hours is $83. The best round-trip flight deal from Chicago to Illinois found on momondo in the last 72 hours is $225.

The fastest flight from Chicago to Illinois takes 0h 56m

Direct flights go from Chicago to Illinois every day.

There are 98 airports in Illinois. From Chicago there are direct flights to Decatur Arpt (DEC), Greater Peoria (PIA), Lambert-St Louis (STL), Moline Quad-City (MLI) and 2 more.

Search flight deals

Frequently asked questions about flying from Chicago to Illinois

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?
The number of operators available for flights from Chicago to Illinois is 5 as of August 2026.
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?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Chicago to Illinois is Airbus A321neo (12.85% of total bookings). The next most popular plane models are Airbus A320-100/200 (11.76%), Boeing 737 MAX 8 (7.20%), and Airbus A321 (sharklets) (6.48%).

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
American Airlines	PriceFrom $168	Free Cancellation	Rating 7.1 11,897 reviews		Search American Airlines flights
United Airlines	PriceFrom $179	Free Cancellation	Rating 7.4 10,095 reviews		Search United 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.