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$44+ Cheap flights from Chicago (CHI) to Illinois

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/19. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — ORD
Feb 4 — Feb 111
Tue 2/4
Tue 2/11
1 adult, Economy
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Cheap flight deals from Chicago to Illinois

Discover tips and strategies to find the most affordable flight options for your journey from Chicago (CHI) to Illinois (USIL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 30, 2025.

Round-trip from

$88
(Priceline)

One-way from

$44
(Priceline)

Good round-trip deal

$149 or less

Good one-way deal

$84 or less
From Chicago (CHI) to Illinois
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One-way flight from Chicago (CHI) to Illinois
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Price to beat on a round-trip flight from Chicago (CHI) to Illinois.
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Price to beat on a one-way flight from Chicago (CHI) to Illinois.
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Find flight deals from Chicago to Illinois

Cheapest flights from Chicago to Illinois
Explore the most affordable flight options available from Chicago to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 30, 2025.

This Priceline deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/288:25 amORD - BRL
Nonstop1h 40mSouthern / Mokulele
Fri 3/72:10 pmBRL - ORD
Nonstop1h 40mSouthern / Mokulele
Deal found 1/29$88
This Mytrip deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/158:20 pmORD - STL
1 stop15h 25mSouthern / Mokulele
Sat 3/2212:15 pmSTL - ORD
1 stop3h 35mSouthern / Mokulele
Deal found 1/29$124
This Frontier deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/208:04 amORD - STL
1 stop15h 40mFrontier
Mon 2/247:04 pmSTL - ORD
1 stop18h 21mFrontier
Deal found 1/29$130
This Trip.com deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/186:50 amORD - STL
1 stop26h 26mMultiple Airlines
Thu 2/2012:15 pmSTL - ORD
1 stop3h 35mMultiple Airlines
Deal found 1/29$134
This Southwest deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/208:25 pmMDW - STL
Nonstop1h 15mSouthwest
Mon 2/242:20 pmSTL - MDW
Nonstop1h 10mSouthwest
Deal found 1/29$137
This American Airlines deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/208:45 pmORD - STL
Nonstop1h 18mAmerican Airlines
Mon 2/245:45 amSTL - ORD
Nonstop1h 21mAmerican Airlines
Deal found 1/29$137
This Booking.com deal was found by Cheapflights users on 1/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/112:43 pmMDW - STL
1 stop11h 00mFrontier
Mon 3/35:20 pmSTL - MDW
1 stop21h 52mFrontier
Deal found 1/30$140
This United Airlines deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/110:50 amORD - STL
Nonstop1h 22mUnited Airlines
Mon 3/31:03 pmSTL - ORD
Nonstop1h 32mUnited Airlines
Deal found 1/29$152
This Southwest deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/191:45 pmORD - STL
1 stop7h 00mSouthwest
Thu 2/205:55 amSTL - ORD
1 stop9h 05mSouthwest
Deal found 1/29$157
This Delta deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/179:25 amMDW - STL
1 stop3h 43mDelta
Wed 3/196:50 amSTL - MDW
1 stop5h 46mDelta
Deal found 1/28$177
This American Airlines deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/110:10 amORD - MLI
Nonstop0h 56mAmerican Airlines
Fri 3/711:41 amMLI - ORD
Nonstop1h 08mAmerican Airlines
Deal found 1/29$179
This Delta deal was found by Cheapflights users on 1/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/201:40 pmORD - STL
2 stops8h 37mDelta
Mon 2/2411:50 amSTL - ORD
1 stop6h 35mDelta
Deal found 1/30$182

Find flights from Chicago to Illinois within your budget

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, Cheapflights users made 2,558,603 searches. Data last updated January 30, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

ChicagoBurlington

ORD - BRL

ORDBRL

Chicago O'Hare Intl

Fri 2/28

8:25 am-10:05 am

Nonstop1h 40m

Burlington

Fri 3/7

2:10 pm-3:50 pm

Nonstop1h 40m

$88

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Sat 3/15

8:20 pm-11:45 am

1 stop15h 25m

Lambert-St Louis

Sat 3/22

12:15 pm-3:50 pm

1 stop3h 35m

$124

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 2/20

8:04 am-11:44 pm

1 stop15h 40m

Lambert-St Louis

Mon 2/24

7:04 pm-1:25 pm

1 stop18h 21m

$130

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 2/18

6:50 am-9:16 am

1 stop26h 26m

Lambert-St Louis

Thu 2/20

12:15 pm-3:50 pm

1 stop3h 35m

$134

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Thu 2/20

8:25 pm-9:40 pm

Nonstop1h 15m

Lambert-St Louis

Mon 2/24

2:20 pm-3:30 pm

Nonstop1h 10m

$137

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 2/20

8:45 pm-10:03 pm

Nonstop1h 18m

Lambert-St Louis

Mon 2/24

5:45 am-7:06 am

Nonstop1h 21m

$137

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Sat 3/1

12:43 pm-11:43 pm

1 stop11h 00m

Lambert-St Louis

Mon 3/3

5:20 pm-3:12 pm

1 stop21h 52m

$140

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Sat 3/1

10:50 am-12:12 pm

Nonstop1h 22m

Lambert-St Louis

Mon 3/3

5:36 pm-6:55 pm

Nonstop1h 19m

$152

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Wed 2/19

1:45 pm-8:45 pm

1 stop7h 00m

Lambert-St Louis

Thu 2/20

5:55 am-3:00 pm

1 stop9h 05m

$157

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Mon 3/17

9:25 am-1:08 pm

1 stop3h 43m

Lambert-St Louis

Wed 3/19

6:50 am-12:36 pm

1 stop5h 46m

$177

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/30

Showing 1-10 of 51 results
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Best time to book a flight from Chicago to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Chicago with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Travel insights for flights from Chicago to Illinois

Get recent, data-driven insights about flights from Chicago to Illinois including ideal travel times, pricing trends, and more.

What is the cheapest time of day to fly from CHI to IL?

Find hourly flight availability from Chicago to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 30, 2025.

When flying from Chicago to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated January 30, 2025.
To help decide which airline to fly from Chicago to Illinois, see what other customers have to say about Southwest, Delta and United Airlines. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,585 reviews

Comfort

8.1

Entertainment

7.7

Overall

8.1

Boarding

8.2

Food

7.1

Crew

8.7

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Southwest
8.1
Very good
4,585 reviews
Southwest
8.1
Very good
4,585 reviews

Comfort

8.1

Entertainment

7.7

Overall

8.1

Boarding

8.2

Food

7.1

Crew

8.7

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Delta
8.0
Very good
8,450 reviews
Southwest
8.1
Very good
4,585 reviews

Comfort

8.1

Entertainment

7.7

Overall

8.1

Boarding

8.2

Food

7.1

Crew

8.7

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

United Airlines
7.4
Good
8,906 reviews
Southwest
8.1
Very good
4,585 reviews

Comfort

8.1

Entertainment

7.7

Overall

8.1

Boarding

8.2

Food

7.1

Crew

8.7

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,585 reviews

Comfort

8.1

Entertainment

7.7

Overall

8.1

Boarding

8.2

Food

7.1

Crew

8.7

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Related info for your journey

Find useful and relevant information for your journey from Chicago to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines to fly from Chicago to Illinois one-way?

    The cheapest airline one-way is Southern / Mokulele, with whom users have recently found tickets for as low as $44. However, be on the lookout for offers from Frontier and Southwest, as they are both options that can get you from Chicago to Illinois for a low price.

  • What are the most popular routes from Chicago to Illinois?

    Most travelers choose Chicago O'Hare Intl - Lambert-St Louis, Chicago Midway - Lambert-St Louis or Chicago O'Hare Intl - Greater Peoria when deciding on the best route from Chicago to Illinois.

  • Can I find deals for flights from Chicago to Illinois that include hotel bookings?

    Yes. In addition to deals on Chicago to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Chicago to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Chicago to Illinois.

  • Can I find deals for business class flights from Chicago to Illinois?

    Yes. Cheapflights offers flight deals from Chicago to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Chicago to Illinois?

    Currently, August is the cheapest month in which you can book a flight from Chicago to Illinois (average of $245). Flying from Chicago to Illinois in March is currently the most expensive (average of $325). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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Alternative routes for Chicago to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 2 airlines flying from Chicago to Illinois

Discover the top 2 airlines that operate flights from Chicago to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$160Average$379FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$217Average$316FlexibilityNo cancel feeOn-time69%
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