HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Illinois

$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 11/18. Fares are subject to change and may not be available on all flights or dates of travel.
STL — ORD
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Missouri to Illinois with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 September 15, 2025.

Round-trip from

$97
(Southwest)

One-way from

$49
(Southwest)

Popular in

March

Cheapest in

September

Average price

$254

Good round-trip deal

$78 or less

Good one-way deal

$61 or less
From Missouri to Illinois
Search Deals
One-way flight from Missouri to Illinois
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($23 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 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

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 September 15, 2025.

This Southwest deal was found by Cheapflights users on 9/13. 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 10/165:55 amMCI - STL
Nonstop1h 05mSouthwest
Mon 10/2010:15 pmSTL - MCI
Nonstop1h 05mSouthwest
Deal found 9/13$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.
Thu 10/235:40 amSTL - MDW
Nonstop1h 10mSouthwest
Mon 10/277:40 amMDW - STL
Nonstop1h 10mSouthwest
Deal found 9/15$97
This United Airlines deal was found by Cheapflights users on 9/13. 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 10/115:28 pmSTL - ORD
Nonstop1h 25mUnited Airlines
Sat 10/189:25 amORD - STL
Nonstop1h 24mUnited Airlines
Deal found 9/13$97
This American Airlines 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/237:16 amSTL - ORD
Nonstop1h 27mAmerican Airlines
Mon 10/2710:34 pmORD - STL
Nonstop1h 20mAmerican Airlines
Deal found 9/14$98
This American Airlines deal was found by Cheapflights users on 9/12. 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 10/45:25 pmSTL - ORD
Nonstop1h 33mAmerican Airlines
Sat 10/116:53 pmORD - STL
Nonstop1h 33mAmerican Airlines
Deal found 9/12$99
This Southwest deal was found by Cheapflights users on 9/13. 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 11/197:00 amSTL - MDW
Nonstop1h 10mSouthwest
Mon 11/249:30 amMDW - STL
2 stops4h 45mSouthwest
Deal found 9/13$112
This American Airlines deal was found by Cheapflights users on 9/13. 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 11/18:00 pmSTL - ORD
Nonstop1h 26mAmerican Airlines
Sun 11/96:44 amORD - STL
Nonstop1h 25mAmerican Airlines
Deal found 9/13$115
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.
Mon 10/205:55 amSTL - ORD
1 stop6h 50mSouthwest
Tue 10/211:30 pmORD - STL
1 stop5h 35mSouthwest
Deal found 9/15$117
This Southwest deal was found by Cheapflights users on 9/13. 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 10/141:30 pmSTL - ORD
1 stop9h 35mSouthwest
Wed 10/227:30 amORD - STL
1 stop7h 15mSouthwest
Deal found 9/13$122
This United Airlines deal was found by Cheapflights users on 9/12. 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.
Fri 10/1712:25 pmSTL - ORD
Nonstop1h 25mUnited Airlines
Sun 10/199:25 amORD - STL
Nonstop1h 24mUnited Airlines
Deal found 9/12$133
This Southwest deal was found by Cheapflights users on 9/13. 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 10/114:10 pmMCI - STL
Nonstop1h 05mSouthwest
Mon 10/1310:15 pmSTL - MCI
Nonstop1h 05mSouthwest
Deal found 9/13$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.
Wed 10/158:55 pmSTL - MDW
Nonstop1h 10mSouthwest
Fri 10/177:40 amMDW - STL
Nonstop1h 10mSouthwest
Deal found 9/14$134

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 September 15, 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

Tue 12/2

12:00 pm-1:00 pm

Nonstop1h 00m

Lambert-St Louis

Tue 12/9

8:20 pm-9:30 pm

Nonstop1h 10m

$97

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Sat 11/8

7:58 pm-9:29 pm

Nonstop1h 31m

Chicago O'Hare Intl

Tue 11/11

3:23 pm-4:47 pm

Nonstop1h 24m

$97

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Thu 10/16

5:55 am-7:00 am

Nonstop1h 05m

Lambert-St Louis

Mon 10/20

10:15 pm-11:20 pm

Nonstop1h 05m

$97

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Thu 12/4

6:15 am-7:30 am

Nonstop1h 15m

Lambert-St Louis

Sat 12/6

5:50 pm-7:00 pm

Nonstop1h 10m

$97

St. LouisChicago

STL - MDW

STLMDW

Lambert-St Louis

Thu 10/23

5:40 am-6:50 am

Nonstop1h 10m

Chicago Midway

Mon 10/27

7:40 am-8:50 am

Nonstop1h 10m

$97

St. LouisChicago

STL - MDW

STLMDW

Lambert-St Louis

Wed 11/19

7:00 am-8:10 am

Nonstop1h 10m

Chicago Midway

Mon 11/24

6:45 am-8:00 am

Nonstop1h 15m

$97

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

Sat 10/11

4:10 pm-5:15 pm

Nonstop1h 05m

Lambert-St Louis

Mon 10/13

5:05 pm-10:50 pm

1 stop5h 45m

$107

St. LouisChicago

STL - MDW

STLMDW

Lambert-St Louis

Mon 10/20

5:40 am-6:50 am

Nonstop1h 10m

Chicago Midway

Mon 10/20

6:00 pm-9:30 pm

1 stop3h 30m

$107

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Fri 11/14

6:43 pm-8:13 pm

Nonstop1h 30m

Chicago O'Hare Intl

Sat 11/15

2:20 pm-3:46 pm

Nonstop1h 26m

$115

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Sat 11/15

6:00 am-7:30 am

Nonstop1h 30m

Chicago O'Hare Intl

Sun 11/23

2:50 pm-4:16 pm

Nonstop1h 26m

$115

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

Showing 1-10 of 60 results
1
2
3
...
6

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, August is the cheapest month in which you can book a flight from Missouri to Illinois (average of $245). Flying from Missouri to Illinois in March is currently the most expensive (average of $321). 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 September 15, 2025.

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

Weekly flight availability from Missouri to Illinois

Explore weekly flight availability from Missouri to Illinois. 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 15, 2025.

The most flights from USMO to USIL are scheduled on a Monday (73 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (55 on average).

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 September 15, 2025.
Read reviews from past customers who have flown Southwest, United Airlines, and American 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
4,242 reviews

Crew

8.6

Comfort

8.0

Overall

8.0

Entertainment

7.5

Boarding

8.1

Food

7.0

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

Crew

8.6

Comfort

8.0

Overall

8.0

Entertainment

7.5

Boarding

8.1

Food

7.0

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

Crew

8.6

Comfort

8.0

Overall

8.0

Entertainment

7.5

Boarding

8.1

Food

7.0

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

Crew

8.6

Comfort

8.0

Overall

8.0

Entertainment

7.5

Boarding

8.1

Food

7.0

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

Crew

8.6

Comfort

8.0

Overall

8.0

Entertainment

7.5

Boarding

8.1

Food

7.0

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. The distance between Missouri and Illinois is about 236 mi. Most flights are nonstop.

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

    To fly one-way, consider booking your trip with Southwest, which is currently one of the cheapest options available, starting at $49. United Airlines flights start at $49 while deals on Contour start at $73 one-way.

  • 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, August is the cheapest month in which you can book a flight from Missouri to Illinois (average of $245). Flying from Missouri to Illinois in March is currently the most expensive (average of $321). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Missouri to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to John F Kennedy Intl flights
John F Kennedy Intl to Los Angeles flights
John F Kennedy Intl to Las Vegas flights
John F Kennedy Intl to Miami flights
Dallas/Fort Worth to John F Kennedy Intl flights
Dallas/Fort Worth to Las Vegas flights
San Francisco to John F Kennedy Intl flights
Los Angeles to Seattle flights
LaGuardia to Dallas/Fort Worth flights
Dallas/Fort Worth to Seattle flights
Newark to Fort Lauderdale flights
John F Kennedy Intl to O'Hare Intl flights
Los Angeles to Newark flights
O'Hare Intl to John F Kennedy Intl flights
Dallas/Fort Worth to LaGuardia flights
Newark to Las Vegas flights
LaGuardia to O'Hare Intl flights
LaGuardia to Fort Lauderdale flights
Seattle to Las Vegas flights
O'Hare Intl to Las Vegas flights
Newark to O'Hare Intl flights
O'Hare Intl to LaGuardia flights
Newark to Miami flights
San Francisco to Las Vegas flights
John F Kennedy Intl to Atlanta flights
John F Kennedy Intl to Orlando flights
Newark to Dallas/Fort Worth flights
John F Kennedy Intl to Dallas/Fort Worth flights
Dallas/Fort Worth to O'Hare Intl flights
John F Kennedy Intl to San Francisco flights
Seattle to Dallas/Fort Worth flights
Seattle to Los Angeles flights
Newark to Los Angeles flights
Dallas/Fort Worth to Denver flights
LaGuardia to Miami flights
Los Angeles to Honolulu flights
Los Angeles to Dallas/Fort Worth flights
Los Angeles to LaGuardia flights
O'Hare Intl to Dallas/Fort Worth flights
San Francisco to Newark flights
Newark to Orlando flights
O'Hare Intl to Newark flights
Atlanta to John F Kennedy Intl flights
Dallas/Fort Worth to Los Angeles flights
Los Angeles to O'Hare Intl flights
Dallas/Fort Worth to Newark flights
John F Kennedy Intl to Fort Lauderdale flights
John F Kennedy Intl to Sky Harbor Intl flights
Dulles Intl to Dallas/Fort Worth flights
Atlanta to Las Vegas flights

Top 5 airlines flying from Missouri to Illinois

Discover the top 5 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 September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$117Average$310FlexibilityNo cancel feeOn-time71%
ContourCheapest$123Average$163FlexibilityNo cancel feeOn-timeN/A
Southern / MokuleleCheapest$140Average$217FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$143Average$335FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$151Average$317FlexibilityNo cancel feeOn-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.