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Illinois

$39+ 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 8/5. Fares are subject to change and may not be available on all flights or dates of travel.
STL — ORD
jun. 17 — jun. 241
mar. 6/17
mar. 6/24
1 adult, Economy
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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 junio 12, 2025.

Round-trip from

$97
(Southwest)

One-way from

$39
(Southwest)

Popular in

March

Cheapest in

September

Average price

$324

Good round-trip deal

$78 or less

Good one-way deal

$84 or less
From Missouri to Illinois
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One-way flight from Missouri to Illinois
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Highest demand for flights based on searches. 7% potential increase in price ($23 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Price to beat on a round-trip flight from Missouri to Illinois.
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Price to beat on a one-way flight from Missouri to Illinois.
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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 junio 12, 2025.

This Southwest deal was found by Cheapflights users on 6/11. 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. 8/611:35 amSTL - MDW
Nonstop1h 05mSouthwest
lun. 8/186:05 pmMDW - STL
Nonstop1h 15mSouthwest
Deal found 6/11$97
This American Airlines deal was found by Cheapflights users on 6/11. 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.
jue. 8/218:50 amSTL - ORD
Nonstop1h 31mAmerican Airlines
jue. 9/410:34 pmORD - STL
Nonstop1h 14mAmerican Airlines
Deal found 6/11$97
This Southwest deal was found by Cheapflights users on 6/10. 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.
mar. 8/56:25 amSTL - ORD
1 stop6h 20mSouthwest
mié. 8/61:50 pmORD - STL
1 stop8h 05mSouthwest
Deal found 6/10$117
This Mytrip deal was found by Cheapflights users on 6/10. 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.
jue. 7/103:45 pmCGI - ORD
Nonstop1h 40mContour
lun. 8/1811:25 amORD - CGI
Nonstop1h 35mContour
Deal found 6/10$121
This Southwest deal was found by Cheapflights users on 6/12. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/68:35 amMCI - STL
Nonstop1h 05mSouthwest
lun. 9/89:50 amSTL - MCI
Nonstop1h 05mSouthwest
Deal found 6/12$124
This Trip.com deal was found by Cheapflights users on 6/12. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/75:00 amSTL - ORD
Nonstop1h 30mUnited Airlines
lun. 8/119:20 pmORD - STL
Nonstop1h 25mUnited Airlines
Deal found 6/12$155
This Trip.com deal was found by Cheapflights users on 6/10. 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.
vie. 7/251:00 pmSTL - ORD
1 stop3h 32mSouthern / Mokulele
dom. 7/278:15 amORD - STL
1 stop3h 55mSouthern / Mokulele
Deal found 6/10$166
This Southwest deal was found by Cheapflights users on 6/10. 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. 8/235:25 pmMCI - ORD
1 stop4h 35mSouthwest
lun. 8/255:45 pmORD - MCI
1 stop5h 00mSouthwest
Deal found 6/10$174
This Southwest deal was found by Cheapflights users on 6/11. 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.
jue. 8/147:10 pmMCI - MDW
1 stop4h 40mSouthwest
sáb. 8/168:00 amMDW - MCI
1 stop7h 40mSouthwest
Deal found 6/11$174
This Delta deal was found by Cheapflights users on 6/10. 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. 9/106:35 amMCI - ORD
1 stop6h 10mDelta
mar. 9/169:30 amORD - MCI
1 stop5h 29mDelta
Deal found 6/10$177
This Delta deal was found by Cheapflights users on 6/11. 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.
mar. 8/52:07 pmMCI - MDW
1 stop4h 33mDelta
mié. 8/139:31 amMDW - MCI
1 stop3h 47mDelta
Deal found 6/11$177
This Delta deal was found by Cheapflights users on 6/10. 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. 11/86:30 amSTL - MDW
1 stop6h 39mDelta
mar. 11/116:00 amMDW - STL
1 stop4h 40mDelta
Deal found 6/10$177

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 junio 12, 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

St. LouisChicago

STL - MDW

STLMDW

Lambert-St Louis

jue. 8/7

6:00 pm-11:50 pm

1 stop5h 50m

Chicago Midway

lun. 8/11

7:30 am-8:40 am

Nonstop1h 10m

$87

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

jue. 8/21

8:50 am-10:21 am

Nonstop1h 31m

Chicago O'Hare Intl

jue. 9/4

10:34 pm-11:48 pm

Nonstop1h 14m

$97

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

mar. 8/5

6:25 am-12:45 pm

1 stop6h 20m

Chicago O'Hare Intl

mié. 8/6

1:50 pm-9:55 pm

1 stop8h 05m

$117

Cape GirardeauChicago

CGI - ORD

CGIORD

Cape Girardeau

jue. 7/10

3:45 pm-5:25 pm

Nonstop1h 40m

Chicago O'Hare Intl

lun. 8/18

11:25 am-1:00 pm

Nonstop1h 35m

$121

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

sáb. 9/6

8:35 am-9:40 am

Nonstop1h 05m

Lambert-St Louis

lun. 9/8

9:50 am-10:55 am

Nonstop1h 05m

$124

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

jue. 8/7

5:00 am-6:30 am

Nonstop1h 30m

Chicago O'Hare Intl

lun. 8/11

9:20 pm-10:45 pm

Nonstop1h 25m

$155

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

vie. 7/25

1:00 pm-4:32 pm

1 stop3h 32m

Chicago O'Hare Intl

dom. 7/27

8:15 am-12:10 pm

1 stop3h 55m

$166

Kansas CityChicago

MCI - ORD

MCIORD

Kansas City

sáb. 8/23

5:25 pm-10:00 pm

1 stop4h 35m

Chicago O'Hare Intl

lun. 8/25

5:45 pm-10:45 pm

1 stop5h 00m

$174

Kansas CityChicago

MCI - MDW

MCIMDW

Kansas City

jue. 8/14

7:10 pm-11:50 pm

1 stop4h 40m

Chicago Midway

sáb. 8/16

8:00 am-3:40 pm

1 stop7h 40m

$174

Kansas CityChicago

MCI - ORD

MCIORD

Kansas City

mié. 9/10

6:35 am-12:45 pm

1 stop6h 10m

Chicago O'Hare Intl

mar. 9/16

9:30 am-2:59 pm

1 stop5h 29m

$177

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 60 results
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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 junio 12, 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 junio 12, 2025.

The most flights from USMO to USIL are scheduled on a Monday (76 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (27 on average).

Rainfall in Illinois by month

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

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

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

If weather is an important factor for your trip to Illinois, 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 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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 junio 12, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest and Delta from Missouri to Illinois. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,950 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Allegiant Air
7.3
Good
725 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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.

  • 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 $39. Contour flights start at $62 while deals on United Airlines start at $62 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

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Alternative routes for Missouri to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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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 junio 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
ContourCheapest$86Average$158FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$115Average$305FlexibilityNo cancel feeOn-time71%
Southern / MokuleleCheapest$118Average$182FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$126Average$323FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$168Average$305FlexibilityNo cancel feeOn-time63%

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