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$49+ Cheap flights from Missouri 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 12/16. Fares are subject to change and may not be available on all flights or dates of travel.
STL — ORD
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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Find flight deals from Missouri to Illinois

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

This Southwest deal was found by Cheapflights users on 10/29. 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 12/46:15 amMCI - STL
Nonstop1h 15mSouthwest
Mon 12/82:25 pmSTL - MCI
Nonstop1h 10mSouthwest
Deal found 10/29$97
This Southwest deal was found by Cheapflights users on 10/29. 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 12/47:35 pmSTL - MDW
Nonstop1h 10mSouthwest
Mon 12/86:20 amMDW - STL
Nonstop1h 15mSouthwest
Deal found 10/29$97
This American Airlines deal was found by Cheapflights users on 10/30. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/188:01 pmSTL - ORD
Nonstop1h 29mAmerican Airlines
Tue 1/68:50 amORD - STL
Nonstop1h 30mAmerican Airlines
Deal found 10/30$97
This Southwest deal was found by Cheapflights users on 10/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/271:05 pmSTL - MDW
Nonstop1h 10mSouthwest
Thu 12/49:05 pmMDW - STL
Nonstop1h 15mSouthwest
Deal found 10/28$109
This Frontier deal was found by Cheapflights users on 10/29. 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 12/412:04 pmSTL - ORD
1 stop5h 23mFrontier
Thu 12/49:53 pmORD - STL
1 stop13h 29mFrontier
Deal found 10/29$110
This Southwest deal was found by Cheapflights users on 10/30. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/38:25 amSTL - ORD
1 stop3h 50mSouthwest
Wed 12/32:15 pmORD - STL
1 stop7h 10mSouthwest
Deal found 10/30$117
This Mytrip deal was found by Cheapflights users on 10/29. 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.
Thu 11/136:22 pmSTL - ORD
1 stop6h 37mFrontier
Tue 11/186:05 pmORD - STL
1 stop15h 02mFrontier
Deal found 10/29$119
This Booking.com deal was found by Cheapflights users on 10/28. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/187:45 pmSTL - ORD
1 stop19h 54mFrontier
Thu 11/207:00 amORD - STL
1 stop11h 58mFrontier
Deal found 10/28$121
This Mytrip deal was found by Cheapflights users on 10/29. 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.
Tue 11/184:05 pmCGI - ORD
Nonstop1h 40mContour
Fri 11/214:30 pmORD - CGI
Nonstop1h 35mContour
Deal found 10/29$123
This Booking.com deal was found by Cheapflights users on 10/28. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/209:30 amCGI - ORD
Nonstop1h 40mContour
Sun 11/2311:50 amORD - CGI
Nonstop1h 35mContour
Deal found 10/28$129
This Frontier deal was found by Cheapflights users on 10/30. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/412:04 pmSTL - MDW
1 stop6h 04mFrontier
Mon 12/83:10 pmMDW - STL
1 stop7h 23mFrontier
Deal found 10/30$130
This Contour deal was found by Cheapflights users on 10/30. 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 Contour is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/149:30 amCGI - ORD
Nonstop1h 40mContour
Tue 11/1811:50 amORD - CGI
Nonstop1h 35mContour
Deal found 10/30$139

Cheap flight deals from Missouri to Illinois

Keep the following information in mind while searching for Missouri to Illinois flight deals. Data was last updated October 30, 2025.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$97
(Southwest)

One-way from

$49
(Southwest)

Popular in

April

Cheapest in

August

Average price

$294

Good round-trip deal

$131 or less

Good one-way deal

$89 or less
Provider with most accurate pricing for Lambert-St Louis-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Chicago (CHI) flights.
Search Deals
From Missouri to Illinois
Search Deals
One-way flight from Missouri to Illinois
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($17 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals
Price to beat on a round-trip flight from Missouri to Illinois.
Search Deals
Price to beat on a one-way flight from Missouri to Illinois.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Missouri 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 October 30, 2025.
Use the filters below to find and compare flights from Missouri to Illinois that are best for you.

Fly from

Missouri

Fly to

Illinois

Route

Depart

Return

Price

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Thu 12/4

6:15 am-7:30 am

Nonstop1h 15m

Lambert-St Louis

Mon 12/8

2:25 pm-3:35 pm

Nonstop1h 10m

$97

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Mon 12/15

3:19 pm-4:42 pm

Nonstop1h 23m

Chicago O'Hare Intl

Wed 12/17

9:23 pm-10:45 pm

Nonstop1h 22m

$97

St. LouisChicago

STL - MDW

STLMDW

Lambert-St Louis

Wed 12/3

2:15 pm-3:20 pm

Nonstop1h 05m

Chicago Midway

Wed 12/3

5:15 pm-6:30 pm

Nonstop1h 15m

$97

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Tue 12/9

10:00 am-11:29 am

Nonstop1h 29m

Chicago O'Hare Intl

Tue 12/16

1:00 pm-2:25 pm

Nonstop1h 25m

$97

St. LouisChicago

STL - MDW

STLMDW

Lambert-St Louis

Thu 12/4

7:35 pm-8:45 pm

Nonstop1h 10m

Chicago Midway

Mon 12/8

1:10 pm-5:25 pm

1 stop4h 15m

$107

St. LouisChicago

STL - MDW

STLMDW

Lambert-St Louis

Thu 12/4

3:20 pm-8:00 pm

1 stop4h 40m

Chicago Midway

Wed 12/10

9:05 pm-10:20 pm

Nonstop1h 15m

$107

St. LouisChicago

STL - MDW

STLMDW

Lambert-St Louis

Thu 11/27

1:05 pm-2:15 pm

Nonstop1h 10m

Chicago Midway

Thu 12/4

9:05 pm-10:20 pm

Nonstop1h 15m

$109

Cape GirardeauChicago

CGI - ORD

CGIORD

Cape Girardeau

Tue 11/18

4:05 pm-5:45 pm

Nonstop1h 40m

Chicago O'Hare Intl

Fri 11/21

4:30 pm-6:05 pm

Nonstop1h 35m

$123

Cape GirardeauChicago

CGI - ORD

CGIORD

Cape Girardeau

Thu 12/25

9:30 am-11:10 am

Nonstop1h 40m

Chicago O'Hare Intl

Sat 12/27

11:50 am-1:25 pm

Nonstop1h 35m

$123

Cape GirardeauChicago

CGI - ORD

CGIORD

Cape Girardeau

Sun 2/15

9:30 am-11:10 am

Nonstop1h 40m

Chicago O'Hare Intl

Sat 2/21

11:50 am-1:25 pm

Nonstop1h 35m

$128

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/30

Showing 1-10 of 60 results
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Best time to book a flight from Missouri to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Missouri 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.

Cheapflights Insights

Everything you need to know about your flight from Missouri to Illinois

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

Currently, September is the cheapest month in which you can book a flight from Missouri to Illinois (average of $62). Flying from Missouri to Illinois in August is currently the most expensive (average of $142). 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.

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

Find hourly flight availability from Missouri 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 October 30, 2025.

When flying from Missouri to Illinois, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 27% versus a flight at noon.

What is the cheapest day to fly from Missouri to Illinois?

Use this chart to determine the cheapest time to fly round-trip from Missouri to Illinois. Price data was last updated on October 26, 2025.

Travelers seeking maximum savings on their Missouri to Illinois flight should consider departing on Saturday mornings when fares are most often at their lowest. Tuesday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

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 October 30, 2025.
Read reviews from past customers who have flown Southwest, Contour, and United Airlines from Missouri to Illinois. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,243 reviews

Comfort

8.0

Boarding

8.1

Food

7.0

Overall

8.0

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,243 reviews
Southwest
8.0
Very good
4,243 reviews

Comfort

8.0

Boarding

8.1

Food

7.0

Overall

8.0

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Contour
7.5
Good
40 reviews
Southwest
8.0
Very good
4,243 reviews

Comfort

8.0

Boarding

8.1

Food

7.0

Overall

8.0

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
United Airlines
7.4
Good
8,996 reviews
Southwest
8.0
Very good
4,243 reviews

Comfort

8.0

Boarding

8.1

Food

7.0

Overall

8.0

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
11,034 reviews
Southwest
8.0
Very good
4,243 reviews

Comfort

8.0

Boarding

8.1

Food

7.0

Overall

8.0

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southern / Mokulele
6.2
Okay
26 reviews
Southwest
8.0
Very good
4,243 reviews

Comfort

8.0

Boarding

8.1

Food

7.0

Overall

8.0

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

Related info for your journey

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

  • How long is the flight from Missouri to Illinois?

    Departing from Missouri to Illinois will take you 1h 15m. The distance between Missouri and Illinois is about 236 mi. Most flights are nonstop.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Missouri 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 Missouri to Illinois?

    Currently, September is the cheapest month in which you can book a flight from Missouri to Illinois (average of $62). Flying from Missouri to Illinois in August is currently the most expensive (average of $142). 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.

See more FAQs

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Alternative routes for Missouri to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from Missouri to Illinois

Discover the top 6 airlines that operate flights from Missouri 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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$113Average$302FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$115Average$340FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$117Average$332FlexibilityNo cancel feeOn-time63%
FrontierCheapest$118Average$182FlexibilityNo cancel feeOn-time62%
ContourCheapest$123Average$161FlexibilityNo cancel feeOn-timeN/A
Southern / MokuleleCheapest$140Average$221FlexibilityNo cancel feeOn-timeN/A

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