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Cheap flights from Illinois to Chicago from $45

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to Chicago departing on 3/27. 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
1 adult, Economy, 0 bags

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Cheap round-trip flights

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Contour Logo
5:25 pm - 7:00 pm
UIN
-
ORD
1h 35mnonstop
Contour Logo
2:45 pm - 4:05 pm
ORD
-
UIN
1h 20mnonstop
$85Contour
Wed, Apr 8 - Tue, Apr 21
Contour Logo
4:20 pm - 5:45 pm
BRL
-
ORD
1h 25mnonstop
Contour Logo
6:45 pm - 8:05 pm
ORD
-
BRL
1h 20mnonstop
$85Contour
Thu, Mar 26 - Mon, Mar 30
United Airlines Logo
9:50 am - 11:00 am
DEC
-
ORD
1h 10mnonstop
United Airlines Logo
7:45 am - 8:58 am
ORD
-
DEC
1h 13mnonstop
$149United Airlines
Thu, Mar 26 - Mon, Mar 30
United Airlines Logo
9:42 am - 10:55 am
DEC
-
ORD
1h 13mnonstop
United Airlines Logo
7:45 am - 8:58 am
ORD
-
DEC
1h 13mnonstop
$159United Airlines
Thu, Apr 30 - Mon, May 4
American Airlines Logo
8:00 am - 9:31 am
STL
-
ORD
1h 31mnonstop
American Airlines Logo
10:34 pm - 12:05 am
ORD
-
STL
1h 31mnonstop
$171American Airlines
Thu, Apr 2 - Mon, Apr 6
American Airlines Logo
8:00 am - 9:31 am
STL
-
ORD
1h 31mnonstop
American Airlines Logo
10:34 pm - 12:05 am
ORD
-
STL
1h 31mnonstop
$173American Airlines
Thu, Apr 2 - Mon, Apr 6
Delta Logo
1:39 pm - 8:17 pm
STL
-
ORD
6h 38m
1 stop
Delta Logo
9:50 am - 4:40 pm
ORD
-
STL
6h 50m
1 stop
$174Delta
Wed, Apr 1 - Sat, Apr 4
Delta Logo
6:48 am - 12:45 pm
STL
-
ORD
5h 57m
1 stop
Delta Logo
5:04 pm - 8:44 pm
ORD
-
STL
3h 40m
1 stop
$177Delta
Tue, Apr 14 - Tue, Apr 14
Frontier Logo
8:16 pm - 12:38 am
STL
-
ORD
28h 22m
1 stop
Frontier Logo
6:08 pm - 10:30 am
ORD
-
STL
16h 22m
1 stop
$178Frontier
Fri, Apr 10 - Wed, Apr 15
Frontier Logo
4:19 pm - 11:13 pm
STL
-
ORD
6h 54m
1 stop
Frontier Logo
5:30 pm - 12:21 am
ORD
-
STL
6h 51m
1 stop
$180Frontier
Thu, May 7 - Fri, May 8

Delta flights from Illinois to Chicago O'Hare Intl Airport

Our best Delta deals on Illinois to Chicago O'Hare Intl Airport flight tickets
Delta
Apr 1
STL1:39 pmLambert-St Louis
6h 38m
1 stop
ORD8:17 pmChicago O'Hare Intl
Apr 4
ORD9:50 amChicago O'Hare Intl
6h 50m
1 stop
STL4:40 pmLambert-St Louis
$174
Delta
Apr 14
STL6:48 amLambert-St Louis
5h 57m
1 stop
ORD12:45 pmChicago O'Hare Intl
Apr 14
ORD5:04 pmChicago O'Hare Intl
3h 40m
1 stop
STL8:44 pmLambert-St Louis
$177
Delta
Apr 22
STL11:42 amLambert-St Louis
6h 53m
1 stop
ORD6:35 pmChicago O'Hare Intl
Apr 25
ORD7:00 amChicago O'Hare Intl
9h 50m
2 stops
STL4:50 pmLambert-St Louis
$179

Southwest flights from Illinois to Chicago O'Hare Intl Airport

Our best Southwest deals on Illinois to Chicago O'Hare Intl Airport flight tickets
Southwest
Apr 18
STL6:10 amLambert-St Louis
8h 10m
2 stops
ORD2:20 pmChicago O'Hare Intl
Apr 25
ORD1:55 pmChicago O'Hare Intl
5h 15m
1 stop
STL7:10 pmLambert-St Louis
$196
Southwest
Apr 27
STL6:20 amLambert-St Louis
8h 40m
1 stop
ORD3:00 pmChicago O'Hare Intl
Apr 28
ORD10:30 amChicago O'Hare Intl
7h 35m
1 stop
STL6:05 pmLambert-St Louis
$214
Southwest
Apr 2
STL5:45 amLambert-St Louis
5h 25m
1 stop
ORD11:10 amChicago O'Hare Intl
Apr 6
ORD2:40 pmChicago O'Hare Intl
9h 25m
1 stop
STL12:05 amLambert-St Louis
$236

momondo Fare Finder

 
Customize your flight search to find flights from Illinois to Chicago O'Hare Intl Airport 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 March 14, 2026.
Use the filters below to find and compare flights from Illinois to Chicago O'Hare Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

QuincyChicago

UIN - ORD

UINORD

Quincy Regional

Wed 4/8

5:25 pm-7:00 pm

Nonstop1h 35m

Chicago O'Hare Intl

Tue 4/21

2:45 pm-4:05 pm

Nonstop1h 20m

$85

BurlingtonChicago

BRL - ORD

BRLORD

Burlington

Thu 3/26

4:20 pm-5:45 pm

Nonstop1h 25m

Chicago O'Hare Intl

Mon 3/30

6:45 pm-8:05 pm

Nonstop1h 20m

$85
Quickest round-trip

DecaturChicago

DEC - ORD

DECORD

Decatur Arpt

Thu 3/26

9:50 am-11:00 am

Nonstop1h 10m

Chicago O'Hare Intl

Mon 3/30

7:45 am-8:58 am

Nonstop1h 13m

$149

DecaturChicago

DEC - ORD

DECORD

Decatur Arpt

Thu 4/30

9:42 am-10:55 am

Nonstop1h 13m

Chicago O'Hare Intl

Mon 5/4

7:45 am-8:58 am

Nonstop1h 13m

$159

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Thu 4/2

8:00 am-9:31 am

Nonstop1h 31m

Chicago O'Hare Intl

Mon 4/6

10:34 pm-12:05 am

Nonstop1h 31m

$171

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Thu 4/2

8:00 am-9:31 am

Nonstop1h 31m

Chicago O'Hare Intl

Mon 4/6

10:34 pm-12:05 am

Nonstop1h 31m

$173

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Wed 4/1

1:39 pm-8:17 pm

1 stop6h 38m

Chicago O'Hare Intl

Sat 4/4

9:50 am-4:40 pm

1 stop6h 50m

$174

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Tue 4/14

6:48 am-12:45 pm

1 stop5h 57m

Chicago O'Hare Intl

Tue 4/14

5:04 pm-8:44 pm

1 stop3h 40m

$177

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Fri 4/10

8:16 pm-12:38 am

1 stop28h 22m

Chicago O'Hare Intl

Wed 4/15

6:08 pm-10:30 am

1 stop16h 22m

$178

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Thu 5/7

4:19 pm-11:13 pm

1 stop6h 54m

Chicago O'Hare Intl

Fri 5/8

5:30 pm-12:21 am

1 stop6h 51m

$180

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 Chicago from

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

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 day to depart on your flight to Chicago O'Hare Intl Airport?

The cheapest day to depart on your flight to Chicago O'Hare Intl Airport is on a Friday when prices can be found for as low as $383. This is often the case because there is less demand to fly during this day of the week. On the other hand, Monday is the most expensive day to depart from Illinois because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $559.

What is the cheapest time of day to depart on your flight to Chicago O'Hare Intl Airport?

Flying to Chicago O'Hare Intl Airport from Illinois in the evening is the least expensive time of day to depart. momondo users have found prices as low as $364 when looking at flights departing in the evening. Try not to purchase tickets in the morning because they tend to be around $418. Of course, these prices can vary depending on the time of year and what airport you fly to.

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

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

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

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

Cheap Illinois to Chicago O'Hare Intl Airport flight deals and tips

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

Best Price Found

$41

Fastest flight time

0h 50m

Direct flights

Every day
The best one-way flight to Chicago O'Hare Intl Airport from Illinois in the past 72 hours is $41. The best round-trip flight deal from Illinois to Chicago O'Hare Intl Airport found on momondo in the last 72 hours is $125.
The fastest flight from Illinois to Chicago O'Hare Intl Airport takes 0h 50m
Direct flights go from Illinois to Chicago O'Hare Intl Airport every day.
Search flight deals

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

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

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

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

    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 Illinois to Chicago O'Hare Intl Airport.

  • What documentation or ID do you need to fly to Chicago O'Hare Intl Airport?

    The travel and health documents required for your trip to Chicago O'Hare Intl Airport 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 Chicago O'Hare Intl Airport. 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 Illinois to Chicago O'Hare Intl Airport?

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

Compare and see reviews for airlines that fly from Illinois to Chicago O'Hare Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $179Free CancellationRating
7.4
9,423 reviews
Search United Airlines flights
American AirlinesPriceFrom $179Free CancellationRating
7.1
11,464 reviews
Search American Airlines flights

Traveling to a place near Chicago?

Book flights to Chicago if you plan to visit one of these locations
Lake Geneva
Schaumburg
South Haven
Rockford
Merrillville
Gurnee
Rosemont
Naperville
New Buffalo
Orland Park
Kenosha
Oak Brook
Joliet
Racine
Janesville
Hammond
Aurora
Tinley Park
Elgin
South Holland

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Chicago from Illinois.

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

Yes. momondo allows you to filter the results for Illinois to Chicago flights to just show those with flexible booking policies.

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

Once all potential Illinois to Chicago flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

If you are simply researching potential flights to Chicago, momondo offers a useful price alert feature which will track prices for flights to Chicago from Illinois and alert you when they change.

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