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$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 12/10. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — STL
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
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 September 16, 2025.

Round-trip from

$97
(Southwest)

One-way from

$49
(Southwest)

Popular in

December

Cheapest in

October

Average price

$308

Good round-trip deal

$138 or less

Good one-way deal

$81 or less
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. 0% potential increase in price ($3 potential increase over avg. RT price).
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Cheapest flight prices on average. 0% potential price decrease ($3 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 16, 2025.

This Southwest deal was found by Cheapflights users on 9/16. 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.
Sat 10/258:25 amSTL - MCI
Nonstop1h 05mSouthwest
Mon 10/275:55 amMCI - STL
Nonstop1h 05mSouthwest
Deal found 9/16$97
This Southwest deal was found by Cheapflights users on 9/15. 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 10/1512:40 pmMDW - STL
Nonstop1h 10mSouthwest
Wed 10/221:15 pmSTL - MDW
Nonstop1h 10mSouthwest
Deal found 9/15$97
This United Airlines deal was found by Cheapflights users on 9/15. 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.
Wed 10/159:25 amORD - STL
Nonstop1h 24mUnited Airlines
Wed 10/225:00 amSTL - ORD
Nonstop1h 30mUnited Airlines
Deal found 9/15$97
This American Airlines deal was found by Cheapflights users on 9/15. 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 10/76:53 pmORD - STL
Nonstop1h 33mAmerican Airlines
Wed 10/228:42 amSTL - ORD
Nonstop1h 23mAmerican Airlines
Deal found 9/15$98
This Southwest deal was found by Cheapflights users on 9/15. 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 10/155:30 amMDW - STL
1 stop4h 45mSouthwest
Wed 10/155:05 pmSTL - MDW
Nonstop1h 05mSouthwest
Deal found 9/15$107
This Southwest deal was found by Cheapflights users on 9/15. 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.
Sat 11/151:45 pmSTL - MCI
2 stops6h 10mSouthwest
Mon 11/176:15 amMCI - STL
Nonstop1h 15mSouthwest
Deal found 9/15$112
This Southwest deal was found by Cheapflights users on 9/14. 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.
Sat 10/188:20 amMDW - STL
2 stops6h 10mSouthwest
Mon 10/207:35 amSTL - MDW
Nonstop1h 10mSouthwest
Deal found 9/14$112
This Southwest deal was found by Cheapflights users on 9/15. 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.
Tue 10/71:30 pmORD - STL
1 stop7h 15mSouthwest
Wed 10/222:55 pmSTL - ORD
1 stop6h 35mSouthwest
Deal found 9/15$117
This Southwest deal was found by Cheapflights users on 9/14. 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.
Sat 10/257:00 amORD - STL
1 stop5h 30mSouthwest
Sat 10/251:45 pmSTL - ORD
2 stops8h 15mSouthwest
Deal found 9/14$122
This eDestinos deal was found by Cheapflights users on 9/14. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/17:20 amORD - STL
1 stop25h 46mFrontier
Thu 10/24:00 pmSTL - ORD
1 stop7h 39mFrontier
Deal found 9/14$125
This Southwest deal was found by Cheapflights users on 9/14. 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.
Mon 10/2710:15 pmSTL - MCI
Nonstop1h 05mSouthwest
Fri 10/314:00 pmMCI - STL
Nonstop1h 05mSouthwest
Deal found 9/14$134
This Southwest deal was found by Cheapflights users on 9/14. 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.
Fri 10/247:40 amMDW - STL
Nonstop1h 10mSouthwest
Mon 10/275:40 amSTL - MDW
Nonstop1h 10mSouthwest
Deal found 9/14$134

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 September 16, 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

St. LouisKansas City

STL - MCI

STLMCI

Lambert-St Louis

Tue 10/14

2:45 pm-3:50 pm

Nonstop1h 05m

Kansas City

Tue 10/21

6:15 am-7:15 am

Nonstop1h 00m

$97

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 11/6

6:44 am-8:09 am

Nonstop1h 25m

Lambert-St Louis

Sat 11/8

6:00 am-7:30 am

Nonstop1h 30m

$97

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Wed 10/22

9:25 am-10:49 am

Nonstop1h 24m

Lambert-St Louis

Thu 10/23

5:00 am-6:30 am

Nonstop1h 30m

$97

St. LouisKansas City

STL - MCI

STLMCI

Lambert-St Louis

Sat 10/25

8:25 am-9:30 am

Nonstop1h 05m

Kansas City

Mon 10/27

5:55 am-7:00 am

Nonstop1h 05m

$97

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 10/21

10:34 pm-11:54 pm

Nonstop1h 20m

Lambert-St Louis

Mon 10/27

4:34 pm-6:02 pm

Nonstop1h 28m

$97

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 11/6

2:20 pm-3:46 pm

Nonstop1h 26m

Lambert-St Louis

Sat 11/8

5:24 pm-6:47 pm

Nonstop1h 23m

$97

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Wed 11/5

11:25 am-12:35 pm

Nonstop1h 10m

Lambert-St Louis

Sat 11/8

5:45 pm-6:55 pm

Nonstop1h 10m

$97

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Tue 10/28

7:55 am-9:10 am

Nonstop1h 15m

Lambert-St Louis

Thu 10/30

6:30 pm-7:40 pm

Nonstop1h 10m

$97

St. LouisKansas City

STL - MCI

STLMCI

Lambert-St Louis

Wed 10/29

4:15 pm-10:15 pm

1 stop6h 00m

Kansas City

Wed 11/5

4:10 pm-5:15 pm

Nonstop1h 05m

$107

St. LouisKansas City

STL - MCI

STLMCI

Lambert-St Louis

Sat 10/25

7:00 am-2:15 pm

1 stop7h 15m

Kansas City

Sat 11/1

4:10 pm-5:15 pm

Nonstop1h 05m

$107

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

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 $311). Flying from Illinois to Missouri in March is currently the most expensive (average of $356). 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 September 16, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to Missouri as you normally would.

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 September 16, 2025.

The most flights from USIL to USMO are scheduled on a Monday (69 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (50 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 September 16, 2025.
Read reviews from past customers who have flown Southwest, United Airlines, and American 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
4,242 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.5

Comfort

8.0

Food

7.0

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
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.5

Comfort

8.0

Food

7.0

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
8,929 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.5

Comfort

8.0

Food

7.0

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
10,000 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.5

Comfort

8.0

Food

7.0

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
7.1
Good
35 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.5

Comfort

8.0

Food

7.0

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 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 05m. Southwest provides one of the quickest options available for as low as $97. The distance between Illinois and Missouri is about 236 mi. Most flights are nonstop.

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

    The cheapest airline one-way is Southwest, with whom users have recently found tickets for as low as $49. However, be on the lookout for offers from United Airlines and American Airlines, as they are both options that can get you from Illinois to Missouri for a low price.

  • 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 $311). Flying from Illinois to Missouri in March is currently the most expensive (average of $356). 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 September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$77Average$305FlexibilityNo cancel feeOn-time63%
ContourCheapest$114Average$184FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$116Average$364FlexibilityNo cancel feeOn-time71%
Southern / MokuleleCheapest$118Average$221FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$152Average$339FlexibilityNo cancel feeOn-time69%

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