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Missouri

$49+ Cheap flights from Illinois to Missouri

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 1/17. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — STL
Dec 2 — Dec 91
Tue 12/2
Tue 12/9
1 adult, Economy
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Cheap flight deals from Illinois to Missouri

Keep the following information in mind while searching for Illinois to Missouri flight deals. Data was last updated November 2, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$124
(Mytrip)

One-way from

$49
(Southwest)

Popular in

October

Cheapest in

August

Average price

$300

Good round-trip deal

$61 or less

Good one-way deal

$64 or less
Provider with most accurate pricing for Chicago (CHI)-Lambert-St Louis flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-Lambert-St Louis flights.
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From Illinois to Missouri
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One-way flight from Illinois to Missouri
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Highest demand for flights based on searches. 9% potential increase in price ($34 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($12 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
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Price to beat on a round-trip flight from Illinois to Missouri.
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Price to beat on a one-way flight from Illinois to Missouri.
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Find flight deals from Illinois to Missouri

Cheapest flights from Illinois to Missouri
Explore the most affordable flight options available from Illinois to Missouri. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 2, 2025.

This Mytrip deal was found by Cheapflights users on 11/1. 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.
Sun 11/1611:50 amORD - CGI
Nonstop1h 35mContour
Thu 11/209:30 amCGI - ORD
Nonstop1h 40mContour
Deal found 11/1$124
This Booking.com 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/2711:50 amORD - CGI
Nonstop1h 35mContour
Fri 1/29:30 amCGI - ORD
Nonstop1h 40mContour
Deal found 10/30$129
This FlightHub deal was found by Cheapflights users on 10/31. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/1411:50 amORD - CGI
Nonstop1h 35mContour
Mon 11/179:30 amCGI - ORD
Nonstop1h 40mContour
Deal found 10/31$138
This Southwest deal was found by Cheapflights users on 11/1. 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 12/172:25 pmSTL - MCI
Nonstop1h 10mSouthwest
Thu 12/181:30 pmMCI - STL
Nonstop1h 00mSouthwest
Deal found 11/1$144
This United Airlines deal was found by Cheapflights users on 11/2. 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.
Tue 12/92:14 pmORD - STL
Nonstop1h 26mUnited Airlines
Wed 12/106:42 pmSTL - ORD
Nonstop1h 30mUnited Airlines
Deal found 11/2$144
This Frontier deal was found by Cheapflights users on 11/2. 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 12/43:10 pmMDW - STL
1 stop17h 49mFrontier
Mon 12/810:47 amSTL - MDW
1 stop11h 25mFrontier
Deal found 11/2$150
This Frontier deal was found by Cheapflights users on 11/1. 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.
Sat 11/158:00 amORD - STL
1 stop7h 38mFrontier
Mon 11/1712:09 pmSTL - ORD
1 stop12h 40mFrontier
Deal found 11/1$150
This Kiwi.com deal was found by Cheapflights users on 10/31. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/76:15 amMDW - STL
1 stop27h 37mFrontier
Thu 12/1112:04 pmSTL - MDW
1 stop6h 04mFrontier
Deal found 10/31$152
This Kiwi.com deal was found by Cheapflights users on 11/2. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/45:05 amORD - STL
1 stop6h 02mFrontier
Fri 12/510:42 amSTL - ORD
1 stop25h 12mFrontier
Deal found 11/2$152
This American Airlines deal was found by Cheapflights users on 11/2. 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.
Tue 12/911:12 amORD - STL
Nonstop1h 32mAmerican Airlines
Tue 12/95:40 pmSTL - ORD
Nonstop1h 40mAmerican Airlines
Deal found 11/2$156
This Delta deal was found by Cheapflights users on 11/2. 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.
Wed 12/3110:46 amORD - STL
1 stop5h 42mDelta
Tue 1/135:00 pmSTL - ORD
1 stop6h 57mDelta
Deal found 11/2$157
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 12/3110:05 amMDW - STL
1 stop6h 00mSouthwest
Tue 1/276:50 amSTL - MDW
2 stops7h 05mSouthwest
Deal found 10/30$159

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to Missouri 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 November 2, 2025.
Use the filters below to find and compare flights from Illinois to Missouri that are best for you.

Fly from

Illinois

Fly to

Missouri

Route

Depart

Return

Price

ChicagoCape Girardeau

ORD - CGI

ORDCGI

Chicago O'Hare Intl

Sun 11/16

11:50 am-1:25 pm

Nonstop1h 35m

Cape Girardeau

Thu 11/20

9:30 am-11:10 am

Nonstop1h 40m

$124

ChicagoCape Girardeau

ORD - CGI

ORDCGI

Chicago O'Hare Intl

Sat 12/27

11:50 am-1:25 pm

Nonstop1h 35m

Cape Girardeau

Fri 1/2

9:30 am-11:10 am

Nonstop1h 40m

$129

ChicagoCape Girardeau

ORD - CGI

ORDCGI

Chicago O'Hare Intl

Fri 11/14

11:50 am-1:25 pm

Nonstop1h 35m

Cape Girardeau

Mon 11/17

9:30 am-11:10 am

Nonstop1h 40m

$138

ChicagoCape Girardeau

ORD - CGI

ORDCGI

Chicago O'Hare Intl

Thu 12/4

11:50 am-1:25 pm

Nonstop1h 35m

Cape Girardeau

Fri 12/5

9:30 am-11:10 am

Nonstop1h 40m

$138

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Thu 12/4

3:10 pm-8:59 am

1 stop17h 49m

Lambert-St Louis

Mon 12/8

10:47 am-10:12 pm

1 stop11h 25m

$150

St. LouisKansas City

STL - MCI

STLMCI

Lambert-St Louis

Wed 12/17

2:25 pm-3:35 pm

Nonstop1h 10m

Kansas City

Thu 12/18

6:00 pm-11:30 pm

1 stop5h 30m

$154

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Sat 1/17

7:40 pm-9:13 pm

Nonstop1h 33m

Lambert-St Louis

Sun 1/18

9:57 am-11:32 am

Nonstop1h 35m

$157

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Wed 12/31

10:46 am-4:28 pm

1 stop5h 42m

Lambert-St Louis

Tue 1/13

5:00 pm-11:57 pm

1 stop6h 57m

$157

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Sat 1/17

8:00 am-2:49 pm

1 stop6h 49m

Lambert-St Louis

Wed 1/21

10:19 am-4:56 pm

1 stop6h 37m

$157

ChicagoCape Girardeau

ORD - CGI

ORDCGI

Chicago O'Hare Intl

Tue 3/10

11:50 am-1:25 pm

Nonstop1h 35m

Cape Girardeau

Wed 3/11

9:30 am-11:10 am

Nonstop1h 40m

$158

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/1

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

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

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

Currently, August is the cheapest month in which you can book a flight from Illinois to Missouri (average of $77). Flying from Illinois to Missouri in February is currently the most expensive (average of $161). 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 IL to MO?

Find hourly flight availability from Illinois to Missouri. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 2, 2025.

One of the essential ways to save on airfare from Illinois to Missouri is to remain as flexible as possible. Flights that are in the afternoon tend to be the most expensive. A flight in the evening could potentially save you up to 26% on airfare.

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

Use this chart to determine the cheapest time to fly round-trip from Illinois to Missouri. Price data was last updated on December 16, 2024.

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

Weekly flight availability from Illinois to Missouri

Explore weekly flight availability from Illinois to Missouri. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated November 2, 2025.

The most flights from USIL to USMO are scheduled on a Sunday (60 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (25 on average).

Reviews of airlines servicing Missouri

Get insights into the airlines that provide service to Missouri. 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 Missouri. Reviews last updated November 2, 2025.
Read reviews from past customers who have flown Southwest, Contour, and United Airlines from Illinois to Missouri. 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
4,241 reviews

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

Comfort

8.0

Boarding

8.1

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
4,241 reviews
Southwest
8.0
Very good
4,241 reviews

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

Comfort

8.0

Boarding

8.1

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
4,241 reviews

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

Comfort

8.0

Boarding

8.1

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
8,993 reviews
Southwest
8.0
Very good
4,241 reviews

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

Comfort

8.0

Boarding

8.1

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
11,032 reviews
Southwest
8.0
Very good
4,241 reviews

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

Comfort

8.0

Boarding

8.1

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
6.1
Okay
25 reviews
Southwest
8.0
Very good
4,241 reviews

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

Comfort

8.0

Boarding

8.1

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 Illinois to Missouri. 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 Illinois to Missouri?

    A quick flight from Illinois to Missouri can take about 1h 10m. Contour provides one of the quickest options available for as low as $154. The distance between Illinois and Missouri is about 236 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from Illinois to Missouri (average of $77). Flying from Illinois to Missouri in February is currently the most expensive (average of $161). 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 Illinois to Missouri

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from Illinois to Missouri

Discover the top 5 airlines that operate flights from Illinois to Missouri. 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 November 2, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$77Average$303FlexibilityNo cancel feeOn-time63%
ContourCheapest$114Average$182FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$115Average$382FlexibilityNo cancel feeOn-time71%
Southern / MokuleleCheapest$145Average$221FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$154Average$334FlexibilityNo cancel feeOn-time69%

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