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Cheap flights from Missouri to Illinois 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 Missouri to Illinois departing on 12/24. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Missouri to Illinois

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
8:05 am - 9:40 amSTL-ORD
1h 35mnonstop
United Airlines Logo
5:50 pm - 7:18 pmORD-STL
1h 28mnonstop
$97United Airlines
Find Deal
jue., dic. 25 - jue., ene. 1
Southwest Logo
7:35 pm - 8:45 pmSTL-MDW
1h 10mnonstop
Southwest Logo
6:20 am - 7:35 amMDW-STL
1h 15mnonstop
$101Southwest
Find Deal
mié., dic. 10 - lun., dic. 15
United Airlines Logo
5:27 pm - 6:50 pmSTL-ORD
1h 23mnonstop
United Airlines Logo
1:00 pm - 2:25 pmORD-STL
1h 25mnonstop
$101United Airlines
Find Deal
vie., dic. 5 - dom., dic. 7
Contour Logo
9:50 am - 11:10 amUIN-ORD
1h 20mnonstop
Contour Logo
2:00 pm - 3:20 pmORD-UIN
1h 20mnonstop
$109Contour
Find Deal
mar., dic. 2 - jue., dic. 4
Frontier Logo
12:04 pm - 10:12 pmSTL-MDW
10h 08m1 stop
Frontier Logo
3:10 pm - 10:33 pmMDW-STL
7h 23m1 stop
$110Frontier
Find Deal
jue., dic. 4 - lun., dic. 8
Frontier Logo
12:04 pm - 5:27 pmSTL-ORD
5h 23m1 stop
Frontier Logo
2:26 pm - 10:33 pmORD-STL
8h 07m1 stop
$110Frontier
Find Deal
jue., dic. 4 - lun., dic. 8
American Airlines Logo
5:05 am - 6:35 amSTL-ORD
1h 30mnonstop
American Airlines Logo
3:23 pm - 4:50 pmORD-STL
1h 27mnonstop
$117American Airlines
Find Deal
mié., dic. 3 - mié., dic. 10
Southwest Logo
4:10 pm - 5:15 pmMCI-STL
1h 05mnonstop
Southwest Logo
2:25 pm - 3:35 pmSTL-MCI
1h 10mnonstop
$117Southwest
Find Deal
mié., dic. 3 - mié., dic. 10
Contour Logo
9:50 am - 11:10 amUIN-ORD
1h 20mnonstop
Contour Logo
7:30 pm - 8:50 pmORD-UIN
1h 20mnonstop
$118Contour
Find Deal
mar., mar. 10 - mié., mar. 11
American Airlines Logo
5:15 am - 6:45 amSTL-ORD
1h 30mnonstop
American Airlines Logo
11:12 am - 12:44 pmORD-STL
1h 32mnonstop
$129American Airlines
Find Deal
jue., dic. 4 - mié., dic. 10

American Airlines flights from Missouri to Illinois

Our best American Airlines deals on Missouri to Illinois flight tickets
American Airlines
Dec 3
STL5:05 amLambert-St Louis
1h 30m
ORD6:35 amChicago O'Hare Intl
Dec 10
ORD3:23 pmChicago O'Hare Intl
1h 27m
STL4:50 pmLambert-St Louis
$117
Find similar
American Airlines
Dec 4
STL5:15 amLambert-St Louis
1h 30m
ORD6:45 amChicago O'Hare Intl
Dec 10
ORD11:12 amChicago O'Hare Intl
1h 32m
STL12:44 pmLambert-St Louis
$129
Find similar
American Airlines
Dec 17
STL5:05 amLambert-St Louis
1h 30m
ORD6:35 amChicago O'Hare Intl
Jan 10
ORD8:51 amChicago O'Hare Intl
1h 30m
STL10:21 amLambert-St Louis
$136
Find similar

Frontier flights from Missouri to Illinois

Our best Frontier deals on Missouri to Illinois flight tickets
Frontier
Dec 4
STL12:04 pmLambert-St Louis
5h 23m
1 stop
ORD5:27 pmChicago O'Hare Intl
Dec 8
ORD2:26 pmChicago O'Hare Intl
8h 07m
1 stop
STL10:33 pmLambert-St Louis
$110
Find similar
Frontier
Dec 4
STL12:04 pmLambert-St Louis
5h 23m
1 stop
ORD5:27 pmChicago O'Hare Intl
Dec 8
ORD2:26 pmChicago O'Hare Intl
8h 07m
1 stop
STL10:33 pmLambert-St Louis
$111
Find similar
Frontier
Dec 11
STL12:04 pmLambert-St Louis
5h 23m
1 stop
ORD5:27 pmChicago O'Hare Intl
Dec 15
ORD2:26 pmChicago O'Hare Intl
8h 07m
1 stop
STL10:33 pmLambert-St Louis
$130
Find similar

momondo 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, momondo users made 832,500 searches. Data last updated noviembre 6, 2025.
Use the filters below to find and compare flights from Missouri to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

jue. 12/25

8:05 am-9:40 am

Nonstop1h 35m

Chicago O'Hare Intl

jue. 1/1

5:50 pm-7:18 pm

Nonstop1h 28m

$97

St. LouisChicago

STL - MDW

STLMDW

Lambert-St Louis

mié. 12/10

7:35 pm-8:45 pm

Nonstop1h 10m

Chicago Midway

lun. 12/15

6:20 am-7:35 am

Nonstop1h 15m

$101

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

vie. 12/5

5:27 pm-6:50 pm

Nonstop1h 23m

Chicago O'Hare Intl

dom. 12/7

1:00 pm-2:25 pm

Nonstop1h 25m

$101

QuincyChicago

UIN - ORD

UINORD

Quincy Regional

mar. 12/2

9:50 am-11:10 am

Nonstop1h 20m

Chicago O'Hare Intl

jue. 12/4

2:00 pm-3:20 pm

Nonstop1h 20m

$109

St. LouisChicago

STL - MDW

STLMDW

Lambert-St Louis

jue. 12/4

12:04 pm-10:12 pm

1 stop10h 08m

Chicago Midway

lun. 12/8

3:10 pm-10:33 pm

1 stop7h 23m

$110

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

jue. 12/4

12:04 pm-5:27 pm

1 stop5h 23m

Chicago O'Hare Intl

lun. 12/8

2:26 pm-10:33 pm

1 stop8h 07m

$110

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

mié. 12/3

5:05 am-6:35 am

Nonstop1h 30m

Chicago O'Hare Intl

mié. 12/10

3:23 pm-4:50 pm

Nonstop1h 27m

$117

Kansas CitySt. Louis

MCI - STL

MCISTL

Kansas City

mié. 12/3

4:10 pm-5:15 pm

Nonstop1h 05m

Lambert-St Louis

mié. 12/10

2:25 pm-3:35 pm

Nonstop1h 10m

$117

QuincyChicago

UIN - ORD

UINORD

Quincy Regional

mar. 3/10

9:50 am-11:10 am

Nonstop1h 20m

Chicago O'Hare Intl

mié. 3/11

7:30 pm-8:50 pm

Nonstop1h 20m

$118

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

jue. 12/4

5:15 am-6:45 am

Nonstop1h 30m

Chicago O'Hare Intl

mié. 12/10

11:12 am-12:44 pm

Nonstop1h 32m

$129

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Illinois from

How to get the cheapest flight ticket from Missouri to Illinois

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 Illinois?

The cheapest month to fly to Illinois from Missouri is in August. Flight prices, which tend to average around $199, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of August, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $223.

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

The cheapest day to depart from Missouri to Illinois is on a Thursday when prices can be found for as low as $675. Flights from Missouri to Illinois on a Monday will generally be more expensive and average around $912. 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 Illinois?

Our most recent data shows that the best time of day to fly to Illinois is in the morning. Flights from Missouri to Illinois during this time can be as low as $605. Flights at noon are often more expensive with an average ticket price of $1,231.

What is the cheapest Missouri to Illinois flight route?

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

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

You are more likely to see cheaper flights to Illinois from Missouri when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $280 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Missouri for as low as $178 on momondo.

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

There are 4 cabin classes available to choose from on Missouri to Illinois 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 Missouri to Illinois flights?

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

Cheap Missouri to Illinois flight deals and tips

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

Best Price Found

$89

Fastest flight time

1h 00m

Direct flights

Every day

Airports in Illinois

2 airports
The best one-way flight to Illinois from Missouri in the past 72 hours is $89. The best round-trip flight deal from Missouri to Illinois found on momondo in the last 72 hours is $171.
The fastest flight from Missouri to Illinois takes 1h 00m
Direct flights go from Missouri to Illinois every day.
There are 2 airports near Illinois: Chicago Midway (MDW), Lambert-St Louis (STL)
Search flight deals

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

    Prices for flights from Missouri to Illinois refresh daily.

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

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

    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 Missouri to Illinois.

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

    The required travel and health documents for your Illinois trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Illinois. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

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

Best airlines flying from Missouri to Illinois

Compare and see reviews for airlines that fly from Missouri to Illinois with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $112Free CancellationRating
7.2
11,040 reviews
Search American Airlines flights
United AirlinesPriceFrom $115Free CancellationRating
7.4
9,007 reviews
Search United Airlines flights
SouthwestPriceFrom $117Free CancellationRating
8.0
4,241 reviews
Search Southwest flights
FrontierPriceFrom $118Free CancellationRating
5.8
3,116 reviews
Search Frontier flights
ContourPriceFrom $123Free CancellationRating
7.5
40 reviews
Search Contour flights
Southern / MokulelePriceFrom $140Free CancellationRating
0.0
0 reviews
Search Southern / Mokulele flights

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Illinois from Missouri.

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

Yes. All flights to Illinois from Missouri on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

momondo helps you find the best flight between Missouri and Illinois by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

Price alerts on flights to Illinois from Missouri are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

An easier way to manage your Illinois trip

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sáb. 12/6
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