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$59+ 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 5/19. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — STL
Feb 25 — Mar 41
Tue 2/25
Tue 3/4
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 February 20, 2025.

Round-trip from

$71
(Trip.com)

One-way from

$59
(Southwest)

Good round-trip deal

$181 or less

Good one-way deal

$71 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 February 20, 2025.

This Trip.com deal was found by Cheapflights users on 2/20. 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.
Mon 3/171:00 pmSTL - UIN
Nonstop1h 00mSouthern / Mokulele
Mon 3/2411:10 amUIN - STL
Nonstop1h 00mSouthern / Mokulele
Deal found 2/20$74
This Frontier deal was found by Cheapflights users on 2/18. 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 4/310:19 amMDW - STL
1 stop13h 27mFrontier
Mon 4/76:38 pmSTL - MDW
1 stop10h 45mFrontier
Deal found 2/18$110
This Frontier deal was found by Cheapflights users on 2/19. 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 4/39:20 amORD - STL
1 stop14h 26mFrontier
Mon 4/76:38 pmSTL - ORD
1 stop10h 27mFrontier
Deal found 2/19$110
This Southwest deal was found by Cheapflights users on 2/20. 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 3/61:15 pmMDW - STL
Nonstop1h 10mSouthwest
Mon 3/108:35 pmSTL - MDW
Nonstop1h 10mSouthwest
Deal found 2/20$117
This American Airlines deal was found by Cheapflights users on 2/20. 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 3/68:57 pmORD - STL
Nonstop1h 17mAmerican Airlines
Mon 3/105:55 amSTL - ORD
Nonstop1h 20mAmerican Airlines
Deal found 2/20$117
This Mytrip deal was found by Cheapflights users on 2/19. 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 4/39:20 amORD - STL
1 stop14h 26mMultiple Airlines
Thu 4/1012:15 pmSTL - ORD
1 stop3h 35mMultiple Airlines
Deal found 2/19$131
This Southwest deal was found by Cheapflights users on 2/20. 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 3/2810:45 pmSTL - MCI
Nonstop1h 10mSouthwest
Mon 3/315:50 amMCI - STL
Nonstop1h 05mSouthwest
Deal found 2/20$132
This Southwest deal was found by Cheapflights users on 2/19. 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 4/245:45 pmORD - STL
1 stop5h 00mSouthwest
Tue 4/295:55 amSTL - ORD
1 stop8h 05mSouthwest
Deal found 2/19$137
This Gotogate deal was found by Cheapflights users on 2/20. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/138:20 pmORD - STL
1 stop23h 50mSouthern / Mokulele
Sun 3/1612:15 pmSTL - ORD
1 stop19h 25mSouthern / Mokulele
Deal found 2/20$139
This Delta deal was found by Cheapflights users on 2/18. 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.
Sat 4/54:00 pmMDW - STL
1 stop7h 30mDelta
Sat 4/126:00 amSTL - MDW
1 stop4h 42mDelta
Deal found 2/18$177
This United Airlines deal was found by Cheapflights users on 2/20. 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.
Thu 3/61:01 pmORD - STL
Nonstop1h 22mUnited Airlines
Mon 3/106:30 amSTL - ORD
Nonstop1h 31mUnited Airlines
Deal found 2/20$179
This Delta deal was found by Cheapflights users on 2/20. 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.
Tue 4/15:00 pmORD - STL
2 stops6h 03mDelta
Tue 4/81:48 pmSTL - ORD
1 stop6h 57mDelta
Deal found 2/20$182

Find flights from Illinois to Missouri within your budget

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 February 20, 2025.

Fly from

Illinois

Fly to

Missouri

Route

Depart

Return

Price

St. LouisQuincy

STL - UIN

STLUIN

Lambert-St Louis

Mon 3/17

1:00 pm-2:00 pm

Nonstop1h 00m

Quincy Regional

Mon 3/24

11:10 am-12:10 pm

Nonstop1h 00m

$74

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Thu 4/3

10:19 am-11:46 pm

1 stop13h 27m

Lambert-St Louis

Mon 4/7

6:38 pm-5:23 am

1 stop10h 45m

$110

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 4/3

9:20 am-11:46 pm

1 stop14h 26m

Lambert-St Louis

Mon 4/7

6:38 pm-5:05 am

1 stop10h 27m

$110

St. LouisKansas City

STL - MCI

STLMCI

Lambert-St Louis

Mon 3/17

10:45 pm-11:55 pm

Nonstop1h 10m

Kansas City

Mon 3/24

6:40 pm-7:45 pm

Nonstop1h 05m

$117

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 3/6

8:57 pm-10:14 pm

Nonstop1h 17m

Lambert-St Louis

Mon 3/10

5:55 am-7:15 am

Nonstop1h 20m

$117

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Thu 3/6

1:15 pm-2:25 pm

Nonstop1h 10m

Lambert-St Louis

Mon 3/10

8:35 pm-9:45 pm

Nonstop1h 10m

$117

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 4/3

9:20 am-11:46 pm

1 stop14h 26m

Lambert-St Louis

Thu 4/10

12:15 pm-3:50 pm

1 stop3h 35m

$131

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 4/24

5:45 pm-10:45 pm

1 stop5h 00m

Lambert-St Louis

Tue 4/29

5:55 am-2:00 pm

1 stop8h 05m

$137

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 3/13

8:20 pm-8:10 pm

1 stop23h 50m

Lambert-St Louis

Sun 3/16

12:15 pm-7:40 am

1 stop19h 25m

$139

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Sat 4/5

4:00 pm-11:30 pm

1 stop7h 30m

Lambert-St Louis

Sat 4/12

6:00 am-10:42 am

1 stop4h 42m

$177

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/18

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.

Travel insights for flights from Illinois to Missouri

Get recent, data-driven insights about flights from Illinois to Missouri including ideal travel times, pricing trends, and more.

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 February 20, 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 February 20, 2025.

The most flights from USIL to USMO are scheduled on a Thursday (52 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (28 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 February 20, 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
4,411 reviews

Entertainment

7.6

Boarding

8.2

Food

7.1

Comfort

8.1

Overall

8.1

Crew

8.7

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Southwest
8.1
Very good
4,411 reviews
Southwest
8.1
Very good
4,411 reviews

Entertainment

7.6

Boarding

8.2

Food

7.1

Comfort

8.1

Overall

8.1

Crew

8.7

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Alaska Airlines
8.0
Very good
9,692 reviews
Southwest
8.1
Very good
4,411 reviews

Entertainment

7.6

Boarding

8.2

Food

7.1

Comfort

8.1

Overall

8.1

Crew

8.7

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Delta
8.0
Very good
8,220 reviews
Southwest
8.1
Very good
4,411 reviews

Entertainment

7.6

Boarding

8.2

Food

7.1

Comfort

8.1

Overall

8.1

Crew

8.7

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

United Airlines
7.4
Good
8,766 reviews
Southwest
8.1
Very good
4,411 reviews

Entertainment

7.6

Boarding

8.2

Food

7.1

Comfort

8.1

Overall

8.1

Crew

8.7

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Allegiant Air
7.3
Good
765 reviews
Southwest
8.1
Very good
4,411 reviews

Entertainment

7.6

Boarding

8.2

Food

7.1

Comfort

8.1

Overall

8.1

Crew

8.7

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

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 $59. However, be on the lookout for offers from United Airlines and Frontier, 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 February 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
ContourCheapest$88Average$128FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$107Average$314FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$115Average$339FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$116Average$304FlexibilityNo cancel feeOn-time63%
Southern / MokuleleCheapest$117Average$178FlexibilityNo cancel feeOn-timeN/A
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