Latest deals
Insights
FAQs
Reviews
Price Alerts

Cheap flights from Illinois to Missouri from $49

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to Missouri departing on 12/18. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Illinois to Missouri

Cheap round-trip flights

American Airlines Logo
1:38 pm - 3:02 pmORD-STL
1h 24mnonstop
American Airlines Logo
5:40 pm - 7:20 pmSTL-ORD
1h 40mnonstop
$97American Airlines
Find Deal
Tue, Nov 18 - Wed, Nov 19
American Airlines Logo
6:53 pm - 8:26 pmORD-STL
1h 33mnonstop
American Airlines Logo
7:16 am - 8:43 amSTL-ORD
1h 27mnonstop
$134American Airlines
Find Deal
Thu, Oct 9 - Fri, Oct 10
United Airlines Logo
2:20 pm - 3:44 pmORD-STL
1h 24mnonstop
United Airlines Logo
5:28 pm - 6:53 pmSTL-ORD
1h 25mnonstop
$137United Airlines
Find Deal
Thu, Oct 16 - Mon, Oct 20
Southwest Logo
7:40 am - 8:50 amMDW-STL
1h 10mnonstop
Southwest Logo
6:30 pm - 7:40 pmSTL-MDW
1h 10mnonstop
$137Southwest
Find Deal
Thu, Oct 16 - Mon, Oct 20
Southwest Logo
9:40 am - 10:55 amMDW-STL
1h 15mnonstop
Southwest Logo
7:45 pm - 11:55 pmSTL-MDW
4h 10m1 stop
$147Southwest
Find Deal
Thu, Oct 16 - Mon, Oct 20
Contour Logo
4:30 pm - 6:05 pmORD-CGI
1h 35mnonstop
Contour Logo
3:05 pm - 4:45 pmCGI-ORD
1h 40mnonstop
$162Contour
Find Deal
Fri, Oct 17 - Fri, Oct 24
Southern / Mokulele Logo
1:10 pm - 4:35 pmORD-STL
3h 25m1 stop
Southern / Mokulele Logo
1:00 pm - 4:19 pmSTL-ORD
3h 19m1 stop
$168Southern / Mokulele
Find Deal
Tue, Oct 21 - Mon, Oct 27
Contour Logo
4:30 pm - 6:05 pmORD-CGI
1h 35mnonstop
Contour Logo
3:05 pm - 4:45 pmCGI-ORD
1h 40mnonstop
$168Contour
Find Deal
Thu, Oct 9 - Mon, Oct 13
Southern / Mokulele Logo
8:15 am - 12:00 pmORD-STL
3h 45m1 stop
Southern / Mokulele Logo
5:15 pm - 8:39 pmSTL-ORD
3h 24m1 stop
$169Southern / Mokulele
Find Deal
Sun, Oct 19 - Sun, Oct 26
United Airlines Logo
1:03 pm - 2:27 pmORD-STL
1h 24mnonstop
United Airlines Logo
8:00 am - 9:30 amSTL-ORD
1h 30mnonstop
$171United Airlines
Find Deal
Sat, Oct 18 - Sat, Oct 25

Frontier flights from Illinois to Missouri

Our best Frontier deals on Illinois to Missouri flight tickets
Frontier
Oct 5
ORD5:10 amChicago O'Hare Intl
9h 54m
1 stop
STL3:04 pmLambert-St Louis
Oct 6
STL4:00 pmLambert-St Louis
7h 39m
1 stop
ORD11:39 pmChicago O'Hare Intl
$143
Find similar
Frontier
Nov 6
ORD5:01 amChicago O'Hare Intl
5h 11m
1 stop
STL10:12 amLambert-St Louis
Nov 10
STL12:09 pmLambert-St Louis
12h 34m
1 stop
ORD12:43 amChicago O'Hare Intl
$144
Find similar
Frontier
Nov 14
MDW6:15 amChicago Midway
9h 46m
1 stop
STL4:01 pmLambert-St Louis
Nov 16
STL11:17 amLambert-St Louis
10h 46m
1 stop
MDW10:03 pmChicago Midway
$150
Find similar

Delta flights from Illinois to Missouri

Our best Delta deals on Illinois to Missouri flight tickets
Delta
Oct 21
MDW9:35 amChicago Midway
3h 47m
1 stop
STL1:22 pmLambert-St Louis
Oct 23
STL6:40 amLambert-St Louis
5h 48m
1 stop
MDW12:28 pmChicago Midway
$177
Find similar
Delta
Oct 16
ORD5:20 amChicago O'Hare Intl
5h 06m
1 stop
STL10:26 amLambert-St Louis
Oct 20
STL3:59 pmLambert-St Louis
5h 25m
1 stop
ORD9:24 pmChicago O'Hare Intl
$184
Find similar
Delta
Oct 3
ORD1:35 pmChicago O'Hare Intl
4h 20m
1 stop
SGF5:55 pmSpringfield-Branson
Oct 7
SGF6:56 pmSpringfield-Branson
5h 03m
1 stop
ORD11:59 pmChicago O'Hare Intl
$329
Find similar

momondo 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, momondo users made 832,500 searches. Data last updated September 21, 2025.
Use the filters below to find and compare flights from Illinois to Missouri that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 11/18

1:38 pm-3:02 pm

Nonstop1h 24m

Lambert-St Louis

Wed 11/19

5:40 pm-7:20 pm

Nonstop1h 40m

$97

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 10/9

6:53 pm-8:26 pm

Nonstop1h 33m

Lambert-St Louis

Fri 10/10

7:16 am-8:43 am

Nonstop1h 27m

$134

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 10/16

2:20 pm-3:44 pm

Nonstop1h 24m

Lambert-St Louis

Mon 10/20

5:28 pm-6:53 pm

Nonstop1h 25m

$137

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Thu 10/16

7:40 am-8:50 am

Nonstop1h 10m

Lambert-St Louis

Mon 10/20

6:30 pm-7:40 pm

Nonstop1h 10m

$137

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Thu 10/16

9:40 am-10:55 am

Nonstop1h 15m

Lambert-St Louis

Mon 10/20

7:45 pm-11:55 pm

1 stop4h 10m

$147

ChicagoCape Girardeau

ORD - CGI

ORDCGI

Chicago O'Hare Intl

Fri 10/17

4:30 pm-6:05 pm

Nonstop1h 35m

Cape Girardeau

Fri 10/24

3:05 pm-4:45 pm

Nonstop1h 40m

$162

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 10/21

1:10 pm-4:35 pm

1 stop3h 25m

Lambert-St Louis

Mon 10/27

1:00 pm-4:19 pm

1 stop3h 19m

$168

ChicagoCape Girardeau

ORD - CGI

ORDCGI

Chicago O'Hare Intl

Thu 10/9

4:30 pm-6:05 pm

Nonstop1h 35m

Cape Girardeau

Mon 10/13

3:05 pm-4:45 pm

Nonstop1h 40m

$168

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Sun 10/19

8:15 am-12:00 pm

1 stop3h 45m

Lambert-St Louis

Sun 10/26

5:15 pm-8:39 pm

1 stop3h 24m

$169

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Sat 10/18

1:03 pm-2:27 pm

Nonstop1h 24m

Lambert-St Louis

Sat 10/25

8:00 am-9:30 am

Nonstop1h 30m

$171

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

See travel insights to Missouri from

How to get the cheapest flight ticket from Illinois to Missouri

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Missouri?

In general, August is the cheapest month to fly from Illinois to Missouri. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $257. If you aren’t able to travel to Missouri during the month of August, then flying in April is also cheap. Prices for this month can be found on momondo for an average of $269.

What is the cheapest day to depart on your flight to Missouri?

The cheapest day to depart from Illinois to Missouri is on a Friday when prices can be found for as low as $277. Flights from Illinois to Missouri on a Monday will generally be more expensive and average around $453. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Missouri?

According to our data, the cheapest time of day to fly to Missouri is in the evening. momondo users have found flights departing from Illinois to Missouri in the evening for as low as $277. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to Missouri are more costly in the morning, with an average ticket price of $331. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest Illinois to Missouri flight route?

Fly from Chicago Midway to Lambert-St Louis for the best Illinois - Missouri flight prices

How far in advance should I book a flight to Missouri?

You are more likely to see cheaper flights to Missouri from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Missouri for around $282 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Missouri from Illinois for as low as $142 on momondo.

What cabin class options are available on Illinois to Missouri flights?

There are 4 cabin classes available to choose from on Illinois to Missouri flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Illinois to Missouri flights?

No. A direct flight is the cheapest option for a flight between Illinois to Missouri.

Cheap Illinois to Missouri flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to Missouri

Best Price Found

$81

Fastest flight time

1h 05m

Direct flights

Every day

Airports in Missouri

3 airports
The best one-way flight to Missouri from Illinois in the past 72 hours is $81. The best round-trip flight deal from Illinois to Missouri found on momondo in the last 72 hours is $61.
The fastest flight from Illinois to Missouri takes 1h 05m
Direct flights go from Illinois to Missouri every day.
There are 3 airports near Missouri: Kansas City (MCI), Columbia Regional (COU), Lambert-St Louis (STL)
Search flight deals

  • When did momondo last update prices for flights from Illinois to Missouri?

    Prices for flights from Illinois to Missouri were last updated today.

  • How many operators does momondo search for flights from Illinois to Missouri?

  • How old do you have to be to fly from Illinois to Missouri?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Illinois to Missouri.

  • What documentation or ID do you need to fly to Missouri?

    The travel and health documents you'll need for your trip to Missouri may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Missouri. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from Illinois to Missouri?

Best airlines flying from Illinois to Missouri

Compare and see reviews for airlines that fly from Illinois to Missouri with momondo
Airline
Rating
Free Cancellation
Price
SouthwestPriceFrom $77Free CancellationRating
8.0
4,244 reviews
Search Southwest flights
ContourPriceFrom $114Free CancellationRating
7.2
36 reviews
Search Contour flights
American AirlinesPriceFrom $116Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
Southern / MokulelePriceFrom $118Free CancellationRating
6.3
25 reviews
Search Southern / Mokulele flights
United AirlinesPriceFrom $152Free CancellationRating
7.4
8,922 reviews
Search United Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Illinois to Missouri?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Illinois to Missouri. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Illinois to Missouri with flexible booking policies on momondo?

Flights from Illinois to Missouri with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Illinois to Missouri?

Once you have performed a search for Illinois to Missouri flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Illinois to Missouri right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Illinois to Missouri flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your Missouri trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Tue 10/21
Tue 10/28
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Missouri

Popular cities in Missouri

Popular flights according to clicks in the last 7 days on momondo
Flights to New Yorkfrom $47
Flights to Los Angelesfrom $38
Flights to Miamifrom $58
Flights to Chicagofrom $60
Flights to Orlandofrom $39
Flights to Las Vegasfrom $39
Flights to San Franciscofrom $51
Flights to Washington, D.C.from $50
Flights to Bostonfrom $67
Flights to Atlantafrom $39
Flights to Dallasfrom $59
Flights to Seattlefrom $102