HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Missouri

$46+ 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 9/16. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — STL
ago. 5 — ago. 121
mar. 8/5
mar. 8/12
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Illinois to Missouri 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 Illinois to Missouri

Keep the following information in mind while searching for Illinois to Missouri flight deals. Data was last updated julio 31, 2025.

Round-trip from

$91
(Southwest)

One-way from

$46
(Southwest)

Popular in

June

Cheapest in

September

Average price

$309

Good round-trip deal

$151 or less

Good one-way deal

$87 or less
From Illinois to Missouri
Search Deals
One-way flight from Illinois to Missouri
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($21 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 0% potential price decrease ($4 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2025
Search Deals
Price to beat on a round-trip flight from Illinois to Missouri.
Search Deals
Price to beat on a one-way flight from Illinois to Missouri.
Search Deals

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 julio 31, 2025.

This Southwest deal was found by Cheapflights users on 7/31. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/206:35 amMDW - STL
Nonstop1h 10mSouthwest
sáb. 10/41:55 pmSTL - MDW
Nonstop1h 10mSouthwest
Deal found 7/31$91
This United Airlines deal was found by Cheapflights users on 7/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 8/271:05 pmORD - STL
Nonstop1h 28mUnited Airlines
mié. 9/36:35 amSTL - ORD
Nonstop1h 30mUnited Airlines
Deal found 7/30$91
This American Airlines deal was found by Cheapflights users on 7/30. 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.
sáb. 9/138:31 pmORD - STL
Nonstop1h 22mAmerican Airlines
sáb. 9/206:10 amSTL - ORD
Nonstop1h 20mAmerican Airlines
Deal found 7/30$92
This Southwest deal was found by Cheapflights users on 7/30. 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.
mié. 8/2710:25 amSTL - MCI
Nonstop1h 05mSouthwest
mié. 9/34:45 pmMCI - STL
Nonstop1h 05mSouthwest
Deal found 7/30$97
This Southwest deal was found by Cheapflights users on 7/28. 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.
mié. 8/273:10 pmORD - STL
1 stop4h 55mSouthwest
mié. 9/36:25 amSTL - ORD
1 stop6h 20mSouthwest
Deal found 7/28$141
This Jettzy deal was found by Cheapflights users on 7/28. 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 Jettzy is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/128:15 amORD - STL
1 stop3h 45mSouthern / Mokulele
vie. 9/199:20 amSTL - ORD
1 stop6h 59mSouthern / Mokulele
Deal found 7/28$167
This Delta deal was found by Cheapflights users on 7/31. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/67:17 pmMDW - STL
1 stop4h 06mDelta
mar. 9/306:40 amSTL - MDW
1 stop5h 48mDelta
Deal found 7/31$177
This Delta deal was found by Cheapflights users on 7/31. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 9/36:10 amORD - STL
1 stop4h 27mDelta
sáb. 9/275:27 pmSTL - ORD
1 stop4h 07mDelta
Deal found 7/31$177
This Frontier deal was found by Cheapflights users on 7/31. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 8/1211:28 amORD - STL
1 stop12h 19mFrontier
sáb. 8/162:52 pmSTL - ORD
1 stop8h 37mFrontier
Deal found 7/31$178
This United Airlines deal was found by Cheapflights users on 7/29. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/157:45 pmORD - COU
Nonstop1h 42mUnited Airlines
mié. 10/228:00 amCOU - ORD
Nonstop1h 35mUnited Airlines
Deal found 7/29$179
This Southwest deal was found by Cheapflights users on 7/30. 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.
mié. 8/2712:45 pmMDW - MCI
Nonstop1h 25mSouthwest
sáb. 8/3010:35 amMCI - MDW
1 stop5h 40mSouthwest
Deal found 7/30$187
This American Airlines deal was found by Cheapflights users on 7/30. 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.
sáb. 8/231:05 pmORD - MCI
Nonstop1h 40mAmerican Airlines
lun. 8/257:21 pmMCI - ORD
Nonstop1h 43mAmerican Airlines
Deal found 7/30$187

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 julio 31, 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

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

sáb. 9/20

6:35 am-7:45 am

Nonstop1h 10m

Lambert-St Louis

sáb. 10/4

1:55 pm-3:05 pm

Nonstop1h 10m

$91

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

mié. 8/27

1:05 pm-2:33 pm

Nonstop1h 28m

Lambert-St Louis

mié. 9/3

6:35 am-8:05 am

Nonstop1h 30m

$91

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

sáb. 9/13

8:31 pm-9:53 pm

Nonstop1h 22m

Lambert-St Louis

sáb. 9/20

6:10 am-7:30 am

Nonstop1h 20m

$92

St. LouisKansas City

STL - MCI

STLMCI

Lambert-St Louis

mié. 8/27

10:25 am-11:30 am

Nonstop1h 05m

Kansas City

mié. 9/3

4:45 pm-5:50 pm

Nonstop1h 05m

$97

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

mié. 8/27

3:10 pm-8:05 pm

1 stop4h 55m

Lambert-St Louis

mié. 9/3

6:25 am-12:45 pm

1 stop6h 20m

$141

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

vie. 9/12

8:15 am-12:00 pm

1 stop3h 45m

Lambert-St Louis

vie. 9/19

9:20 am-4:19 pm

1 stop6h 59m

$167

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

sáb. 9/6

6:17 pm-9:55 pm

1 stop3h 38m

Lambert-St Louis

sáb. 9/27

10:15 am-3:26 pm

1 stop5h 11m

$177

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

mié. 9/3

6:10 am-10:37 am

1 stop4h 27m

Lambert-St Louis

sáb. 9/27

5:27 pm-9:34 pm

1 stop4h 07m

$177

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

mar. 8/12

11:28 am-11:47 pm

1 stop12h 19m

Lambert-St Louis

sáb. 8/16

2:52 pm-11:29 pm

1 stop8h 37m

$178

ChicagoColumbia

ORD - COU

ORDCOU

Chicago O'Hare Intl

mié. 10/15

7:45 pm-9:27 pm

Nonstop1h 42m

Columbia Regional

mié. 10/22

8:00 am-9:35 am

Nonstop1h 35m

$179

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/31

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

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 julio 31, 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 julio 31, 2025.

The most flights from USIL to USMO are scheduled on a Thursday (71 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (41 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 julio 31, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest, and Delta from Illinois to Missouri. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Southwest
8.0
Very good
4,246 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Delta
8.0
Very good
7,981 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
United Airlines
7.4
Good
8,900 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

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 $46. However, be on the lookout for offers from American Airlines and United 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

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 Illinois to Missouri

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

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 julio 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$77Average$318FlexibilityNo cancel feeOn-time63%
ContourCheapest$88Average$182FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$115Average$341FlexibilityNo cancel feeOn-time71%
Southern / MokuleleCheapest$118Average$213FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$152Average$331FlexibilityNo cancel feeOn-time69%

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.