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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 4/17. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — STL
Apr 2 — Apr 91
Wed 4/2
Wed 4/9
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 March 28, 2025.

Round-trip from

$90
(Trip.com)

One-way from

$49
(Southwest)

Good round-trip deal

$132 or less

Good one-way deal

$82 or less
From Illinois to Missouri
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One-way flight from Illinois to Missouri
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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 March 28, 2025.

This Trip.com deal was found by Cheapflights users on 3/27. 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.
Thu 4/108:40 pmSTL - UIN
Nonstop1h 00mSouthern / Mokulele
Wed 4/1611:10 amUIN - STL
Nonstop1h 00mSouthern / Mokulele
Deal found 3/27$90
This Southwest deal was found by Cheapflights users on 3/27. 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 5/89:30 pmSTL - MCI
Nonstop1h 05mSouthwest
Mon 5/125:40 amMCI - STL
Nonstop1h 05mSouthwest
Deal found 3/27$97
This American Airlines deal was found by Cheapflights users on 3/27. 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 4/1710:09 pmORD - STL
Nonstop1h 24mAmerican Airlines
Mon 4/2110:17 amSTL - ORD
Nonstop1h 21mAmerican Airlines
Deal found 3/27$97
This Southwest deal was found by Cheapflights users on 3/27. 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 4/175:45 amMDW - STL
1 stop5h 00mSouthwest
Mon 4/215:35 amSTL - MDW
Nonstop1h 10mSouthwest
Deal found 3/27$107
This Mytrip deal was found by Cheapflights users on 3/27. 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 5/115:00 pmORD - CGI
Nonstop1h 35mContour
Sun 5/183:45 pmCGI - ORD
Nonstop1h 40mContour
Deal found 3/27$122
This Southwest deal was found by Cheapflights users on 3/27. 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 5/17:00 amORD - STL
1 stop6h 10mSouthwest
Fri 5/25:05 amSTL - ORD
1 stop5h 40mSouthwest
Deal found 3/27$132
This Mytrip deal was found by Cheapflights users on 3/27. 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 4/178:25 amORD - STL
1 stop11h 45mSouthern / Mokulele
Mon 4/2112:15 pmSTL - ORD
1 stop3h 35mSouthern / Mokulele
Deal found 3/27$137
This United Airlines deal was found by Cheapflights users on 3/27. 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 6/42:06 pmORD - STL
Nonstop1h 24mUnited Airlines
Tue 6/108:10 amSTL - ORD
Nonstop1h 25mUnited Airlines
Deal found 3/27$157
This Frontier deal was found by Cheapflights users on 3/27. 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.
Fri 4/111:05 pmMDW - STL
1 stop10h 41mFrontier
Sat 4/126:33 pmSTL - MDW
1 stop11h 00mFrontier
Deal found 3/27$169
This Booking.com deal was found by Cheapflights users on 3/27. 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 4/89:34 amORD - STL
1 stop14h 12mFrontier
Wed 4/96:51 pmSTL - ORD
1 stop5h 46mFrontier
Deal found 3/27$170
This Delta deal was found by Cheapflights users on 3/27. 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.
Fri 4/186:45 pmMDW - STL
1 stop4h 51mDelta
Mon 4/211:41 pmSTL - MDW
1 stop4h 39mDelta
Deal found 3/27$177
This Delta deal was found by Cheapflights users on 3/27. 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 6/411:03 amORD - STL
1 stop5h 57mDelta
Mon 6/97:04 pmSTL - ORD
1 stop4h 55mDelta
Deal found 3/27$177

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 March 28, 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. LouisQuincy

STL - UIN

STLUIN

Lambert-St Louis

Thu 4/10

8:40 pm-9:40 pm

Nonstop1h 00m

Quincy Regional

Wed 4/16

11:10 am-12:10 pm

Nonstop1h 00m

$90

St. LouisKansas City

STL - MCI

STLMCI

Lambert-St Louis

Thu 5/8

9:30 pm-10:35 pm

Nonstop1h 05m

Kansas City

Mon 5/12

5:40 am-6:45 am

Nonstop1h 05m

$97

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 4/17

10:09 pm-11:33 pm

Nonstop1h 24m

Lambert-St Louis

Mon 4/21

10:17 am-11:38 am

Nonstop1h 21m

$97

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Thu 4/17

5:45 am-10:45 am

1 stop5h 00m

Lambert-St Louis

Mon 4/21

5:35 am-6:45 am

Nonstop1h 10m

$107

ChicagoCape Girardeau

ORD - CGI

ORDCGI

Chicago O'Hare Intl

Sun 5/11

5:00 pm-6:35 pm

Nonstop1h 35m

Cape Girardeau

Sun 5/18

3:45 pm-5:25 pm

Nonstop1h 40m

$122

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 5/1

7:00 am-1:10 pm

1 stop6h 10m

Lambert-St Louis

Fri 5/2

5:05 am-10:45 am

1 stop5h 40m

$132

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 4/17

8:25 am-8:10 pm

1 stop11h 45m

Lambert-St Louis

Mon 4/21

12:15 pm-3:50 pm

1 stop3h 35m

$137

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Wed 6/4

2:06 pm-3:30 pm

Nonstop1h 24m

Lambert-St Louis

Tue 6/10

8:10 am-9:35 am

Nonstop1h 25m

$157

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Fri 4/11

1:05 pm-11:46 pm

1 stop10h 41m

Lambert-St Louis

Sat 4/12

6:33 pm-5:33 am

1 stop11h 00m

$169

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 4/8

9:34 am-11:46 pm

1 stop14h 12m

Lambert-St Louis

Wed 4/9

6:51 pm-12:37 am

1 stop5h 46m

$170

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/27

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 March 28, 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 March 28, 2025.

The most flights from USIL to USMO are scheduled on a Thursday (51 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (4 on average).

Rainfall in Missouri by month

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

In terms of precipitation, rainfall in Missouri ranges from 1.1 - 5.2 inches per month. May is typically the wettest month, when rainfall can reach 5.2 in. January is typically the driest time to visit Missouri when rainfall is around 1.1 in.

Temperature in Missouri by month

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

If weather is an important factor for your trip to Missouri, 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 78.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 28.4 F).

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 March 28, 2025.
Get a feel of what it's like to fly with Southwest, Alaska Airlines and Delta from Illinois to Missouri by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,273 reviews

Boarding

8.2

Food

7.1

Crew

8.6

Entertainment

7.6

Comfort

8.1

Overall

8.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Southwest
8.1
Very good
4,273 reviews
Southwest
8.1
Very good
4,273 reviews

Boarding

8.2

Food

7.1

Crew

8.6

Entertainment

7.6

Comfort

8.1

Overall

8.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Alaska Airlines
8.0
Very good
9,798 reviews
Southwest
8.1
Very good
4,273 reviews

Boarding

8.2

Food

7.1

Crew

8.6

Entertainment

7.6

Comfort

8.1

Overall

8.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Delta
8.0
Very good
7,896 reviews
Southwest
8.1
Very good
4,273 reviews

Boarding

8.2

Food

7.1

Crew

8.6

Entertainment

7.6

Comfort

8.1

Overall

8.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
United Airlines
7.4
Good
8,603 reviews
Southwest
8.1
Very good
4,273 reviews

Boarding

8.2

Food

7.1

Crew

8.6

Entertainment

7.6

Comfort

8.1

Overall

8.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Allegiant Air
7.3
Good
731 reviews
Southwest
8.1
Very good
4,273 reviews

Boarding

8.2

Food

7.1

Crew

8.6

Entertainment

7.6

Comfort

8.1

Overall

8.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

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.

  • 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 Contour 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 March 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
ContourCheapest$88Average$133FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$115Average$331FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$116Average$325FlexibilityNo cancel feeOn-time63%
Southern / MokuleleCheapest$117Average$177FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$137Average$320FlexibilityNo cancel feeOn-time69%
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