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Cheap flights from St. Louis to Illinois from $59

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Illinois departing on 1/13. 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 St. Louis to Illinois

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
4:49 pm - 6:32 pm
STL
-
ORD
1h 43mnonstop
United Airlines Logo
1:00 pm - 2:30 pm
ORD
-
STL
1h 30mnonstop
$117United Airlines
Wed, Jan 7 - Wed, Jan 14
Multiple Airlines Logo
8:32 pm - 1:57 pm
STL
-
ORD
17h 25m1 stop
Multiple Airlines Logo
12:44 pm - 10:23 am
ORD
-
STL
21h 39m1 stop
$142Multiple Airlines
Mon, Jan 19 - Thu, Jan 22
Frontier Logo
8:22 pm - 1:37 pm
STL
-
ORD
17h 15m1 stop
Frontier Logo
11:51 am - 6:51 am
ORD
-
STL
43h 00m2 stops
$143Frontier
Wed, Jan 21 - Mon, Jan 26
Southwest Logo
8:20 am - 9:30 am
STL
-
MDW
1h 10mnonstop
Southwest Logo
7:45 pm - 9:00 pm
MDW
-
STL
1h 15mnonstop
$144Southwest
Wed, Jan 21 - Thu, Jan 22
United Airlines Logo
8:05 am - 9:40 am
STL
-
ORD
1h 35mnonstop
United Airlines Logo
10:52 am - 12:29 pm
ORD
-
STL
1h 37mnonstop
$144United Airlines
Wed, Jan 21 - Thu, Jan 22
Frontier Logo
8:32 pm - 1:57 pm
STL
-
ORD
17h 25m1 stop
Frontier Logo
4:19 pm - 10:23 am
ORD
-
STL
18h 04m2 stops
$153Frontier
Mon, Jan 19 - Thu, Jan 22
Southwest Logo
1:10 pm - 2:15 pm
STL
-
MDW
1h 05mnonstop
Southwest Logo
2:20 pm - 7:00 pm
MDW
-
STL
4h 40m1 stop
$154Southwest
Wed, Jan 21 - Thu, Jan 22
Delta Logo
5:00 pm - 10:07 pm
STL
-
MDW
5h 07m1 stop
Delta Logo
5:31 pm - 11:39 pm
MDW
-
STL
6h 08m1 stop
$157Delta
Wed, Jan 7 - Wed, Jan 14
Delta Logo
5:00 pm - 11:59 pm
STL
-
ORD
6h 59m1 stop
Delta Logo
11:05 am - 4:37 pm
ORD
-
STL
5h 32m1 stop
$157Delta
Wed, Jan 7 - Wed, Jan 14
Frontier Logo
5:11 pm - 11:09 pm
STL
-
MDW
29h 58m1 stop
Frontier Logo
4:31 pm - 10:34 pm
MDW
-
STL
30h 03m1 stop
$158Frontier
Thu, Jan 8 - Mon, Jan 12

American Airlines flights from St. Louis to Illinois

Our best American Airlines deals on St. Louis to Illinois flight tickets
American Airlines
Jan 8
STL6:44 pmLambert-St Louis
1h 31m
ORD8:15 pmChicago O'Hare Intl
Jan 12
ORD8:50 amChicago O'Hare Intl
1h 30m
STL10:20 amLambert-St Louis
$171
Find similar
American Airlines
Jan 24
STL6:43 pmLambert-St Louis
1h 34m
ORD8:17 pmChicago O'Hare Intl
Jan 31
ORD8:50 amChicago O'Hare Intl
1h 30m
STL10:20 amLambert-St Louis
$172
Find similar
American Airlines
Jan 8
STL6:44 pmLambert-St Louis
1h 31m
ORD8:15 pmChicago O'Hare Intl
Jan 12
ORD8:50 amChicago O'Hare Intl
1h 30m
STL10:20 amLambert-St Louis
$173
Find similar

United Airlines flights from St. Louis to Illinois

Our best United Airlines deals on St. Louis to Illinois flight tickets
United Airlines
Jan 7
STL4:49 pmLambert-St Louis
1h 43m
ORD6:32 pmChicago O'Hare Intl
Jan 14
ORD1:00 pmChicago O'Hare Intl
1h 30m
STL2:30 pmLambert-St Louis
$117
Find similar
United Airlines
Jan 21
STL8:05 amLambert-St Louis
1h 35m
ORD9:40 amChicago O'Hare Intl
Jan 22
ORD10:52 amChicago O'Hare Intl
1h 37m
STL12:29 pmLambert-St Louis
$144
Find similar
United Airlines
Feb 17
STL7:41 amLambert-St Louis
1h 29m
ORD9:10 amChicago O'Hare Intl
Feb 18
ORD7:35 pmChicago O'Hare Intl
1h 25m
STL9:00 pmLambert-St Louis
$177
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis 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 December 11, 2025.
Use the filters below to find and compare flights from St. Louis to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Wed 1/7

4:49 pm-6:32 pm

Nonstop1h 43m

Chicago O'Hare Intl

Wed 1/14

1:00 pm-2:30 pm

Nonstop1h 30m

$117

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Mon 1/19

8:32 pm-1:57 pm

1 stop17h 25m

Chicago O'Hare Intl

Thu 1/22

12:44 pm-10:23 am

1 stop21h 39m

$142

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Wed 1/21

8:22 pm-1:37 pm

1 stop17h 15m

Chicago O'Hare Intl

Mon 1/26

11:51 am-6:51 am

2 stops43h 00m

$143

St. LouisChicago

STL - MDW

STLMDW

Lambert-St Louis

Wed 1/21

8:20 am-9:30 am

Nonstop1h 10m

Chicago Midway

Thu 1/22

7:45 pm-9:00 pm

Nonstop1h 15m

$144

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Wed 1/21

8:05 am-9:40 am

Nonstop1h 35m

Chicago O'Hare Intl

Thu 1/22

10:52 am-12:29 pm

Nonstop1h 37m

$144

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Mon 1/19

8:32 pm-1:57 pm

1 stop17h 25m

Chicago O'Hare Intl

Thu 1/22

4:19 pm-10:23 am

2 stops18h 04m

$153

St. LouisChicago

STL - MDW

STLMDW

Lambert-St Louis

Wed 1/21

1:10 pm-2:15 pm

Nonstop1h 05m

Chicago Midway

Thu 1/22

2:20 pm-7:00 pm

1 stop4h 40m

$154

St. LouisChicago

STL - MDW

STLMDW

Lambert-St Louis

Wed 1/7

5:00 pm-10:07 pm

1 stop5h 07m

Chicago Midway

Wed 1/14

5:31 pm-11:39 pm

1 stop6h 08m

$157

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Wed 1/7

5:00 pm-11:59 pm

1 stop6h 59m

Chicago O'Hare Intl

Wed 1/14

11:05 am-4:37 pm

1 stop5h 32m

$157

St. LouisChicago

STL - MDW

STLMDW

Lambert-St Louis

Thu 1/8

5:11 pm-11:09 pm

1 stop29h 58m

Chicago Midway

Mon 1/12

4:31 pm-10:34 pm

1 stop30h 03m

$158

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 St. Louis 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 St. Louis 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 $230.

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

The cheapest day to depart from St. Louis to Illinois is on a Thursday when prices can be found for as low as $678. Flights from St. Louis to Illinois on a Monday will generally be more expensive and average around $899. 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 St. Louis to Illinois during this time can be as low as $606. Flights at noon are often more expensive with an average ticket price of $1,211.

What is the cheapest Lambert-St Louis to Illinois flight route?

Fly from Lambert-St Louis to Chicago Midway for the best Lambert-St Louis - 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 St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $276 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from St. Louis for as low as $178 on momondo.

What cabin class options are available on Lambert-St Louis to Illinois flights?

There are 4 cabin classes available to choose from on Lambert-St Louis 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 St. Louis to Illinois flights?

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

Cheap St. Louis to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Illinois

Best Price Found

$184

Fastest flight time

1h 05m

Direct flights

Every day

Airports in Illinois

98 airports
The best one-way flight to Illinois from St. Louis in the past 72 hours is $184. The best round-trip flight deal from St. Louis to Illinois found on momondo in the last 72 hours is $317.
The fastest flight from St. Louis to Illinois takes 1h 05m
Direct flights go from St. Louis to Illinois every day.
There are 98 airports in Illinois. From St. Louis there are direct flights to Chicago O'Hare Intl (ORD), Chicago Midway (MDW).
Search flight deals

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Illinois?

    Prices for flights from Lambert-St Louis Airport to Illinois refresh daily.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Illinois?

  • How old do you have to be to fly from Lambert-St Louis Airport 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 Lambert-St Louis Airport to Illinois.

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

    The travel and health documents you'll need for your trip to Illinois 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 Illinois. 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 St. Louis to Illinois?

Best airlines flying from St. Louis to Illinois

Compare and see reviews for airlines that fly from St. Louis to Illinois with momondo
Airline
Rating
Free Cancellation
Price
SouthwestPriceFrom $97Free CancellationRating
7.9
4,252 reviews
Search Southwest flights
American AirlinesPriceFrom $109Free CancellationRating
7.2
11,049 reviews
Search American Airlines flights
United AirlinesPriceFrom $114Free CancellationRating
7.4
9,095 reviews
Search United Airlines 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 St. Louis to Illinois?

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

Can I find flights from St. Louis to Illinois with flexible booking policies on momondo?

Flights from St. Louis to Illinois 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 St. Louis to Illinois?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Illinois from St. Louis.

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

Yes. momondo can track prices for St. Louis to Illinois flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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