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Cheap flights from Illinois to St. Louis from $68

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 St. Louis departing on 2/10. 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 Illinois to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
9:25 am - 11:33 pm
ORD
-
STL
14h 08m
1 stop
Multiple Airlines Logo
5:42 pm - 9:44 pm
STL
-
ORD
28h 02m
1 stop
$145Multiple Airlines
Sat, Jan 31 - Mon, Feb 2
Frontier Logo
5:01 am - 10:37 am
ORD
-
STL
5h 36m
1 stop
Frontier Logo
4:51 pm - 11:38 pm
STL
-
ORD
6h 47m
1 stop
$150Frontier
Wed, Mar 18 - Wed, Mar 18
Southwest Logo
3:55 pm - 5:10 pm
MDW
-
STL
1h 15mnonstop
Southwest Logo
8:30 pm - 9:40 pm
STL
-
MDW
1h 10mnonstop
$157Southwest
Sat, Feb 7 - Mon, Feb 9
Frontier Logo
11:51 am - 11:33 pm
ORD
-
STL
11h 42m
1 stop
Frontier Logo
5:42 pm - 10:41 am
STL
-
ORD
16h 59m
1 stop
$159Frontier
Mon, Jan 26 - Wed, Jan 28
Frontier Logo
10:12 am - 10:33 pm
ORD
-
STL
12h 21m
1 stop
Frontier Logo
3:30 pm - 9:02 am
STL
-
ORD
17h 32m
1 stop
$162Frontier
Thu, Apr 9 - Sat, Apr 11
Southwest Logo
8:10 am - 1:45 pm
MDW
-
STL
5h 35m
1 stop
Southwest Logo
2:50 pm - 7:40 pm
STL
-
MDW
4h 50m
1 stop
$163Southwest
Sat, Feb 21 - Sat, Feb 21
Southwest Logo
6:25 am - 2:05 pm
MDW
-
STL
7h 40m
1 stop
Southwest Logo
6:45 pm - 7:55 pm
STL
-
MDW
1h 10mnonstop
$167Southwest
Sat, Feb 7 - Mon, Feb 9
United Airlines Logo
4:15 pm - 5:43 pm
ORD
-
STL
1h 28mnonstop
United Airlines Logo
11:25 am - 12:58 pm
STL
-
ORD
1h 33mnonstop
$171United Airlines
Sat, Feb 7 - Sat, Feb 14
American Airlines Logo
7:18 am - 8:41 am
ORD
-
STL
1h 23mnonstop
American Airlines Logo
8:00 am - 9:31 am
STL
-
ORD
1h 31mnonstop
$172American Airlines
Thu, Feb 26 - Thu, Mar 5
American Airlines Logo
6:00 am - 8:26 pm
SPI
-
STL
14h 26m
1 stop
American Airlines Logo
1:11 pm - 2:20 pm
STL
-
SPI
49h 09m
1 stop
$646American Airlines
Tue, Jun 16 - Sun, Jun 21

Southwest flights from Illinois to St. Louis

Our best Southwest deals on Illinois to St. Louis flight tickets
Southwest
Feb 7
MDW3:55 pmChicago Midway
1h 15m
STL5:10 pmLambert-St Louis
Feb 9
STL4:30 pmLambert-St Louis
1h 10m
MDW5:40 pmChicago Midway
$157
Southwest
Feb 21
MDW8:10 amChicago Midway
5h 35m
1 stop
STL1:45 pmLambert-St Louis
Feb 21
STL2:50 pmLambert-St Louis
4h 50m
1 stop
MDW7:40 pmChicago Midway
$163
Southwest
Feb 7
MDW3:55 pmChicago Midway
1h 15m
STL5:10 pmLambert-St Louis
Feb 9
STL2:20 pmLambert-St Louis
5h 20m
1 stop
MDW7:40 pmChicago Midway
$167

Delta flights from Illinois to St. Louis

Our best Delta deals on Illinois to St. Louis flight tickets
Delta
Feb 9
ORD9:55 amChicago O'Hare Intl
7h 55m
1 stop
STL5:50 pmLambert-St Louis
Feb 16
STL6:35 amLambert-St Louis
6h 45m
1 stop
ORD1:20 pmChicago O'Hare Intl
$191
Delta
Jan 31
MDW5:00 pmChicago Midway
6h 25m
1 stop
STL11:25 pmLambert-St Louis
Feb 2
STL6:10 amLambert-St Louis
6h 36m
2 stops
MDW12:46 pmChicago Midway
$196
Delta
Feb 5
MDW9:33 amChicago Midway
7h 12m
2 stops
STL4:45 pmLambert-St Louis
Feb 12
STL6:10 amLambert-St Louis
6h 36m
2 stops
MDW12:46 pmChicago Midway
$202

momondo Fare Finder

 
Customize your flight search to find flights from Illinois to St. Louis 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 January 12, 2026.
Use the filters below to find and compare flights from Illinois to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Sat 1/31

9:25 am-11:33 pm

1 stop14h 08m

Lambert-St Louis

Mon 2/2

5:42 pm-9:44 pm

1 stop28h 02m

$145

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Wed 3/18

5:01 am-10:37 am

1 stop5h 36m

Lambert-St Louis

Wed 3/18

4:51 pm-11:38 pm

1 stop6h 47m

$150

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Sat 2/7

3:55 pm-5:10 pm

Nonstop1h 15m

Lambert-St Louis

Mon 2/9

8:30 pm-9:40 pm

Nonstop1h 10m

$157

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Mon 1/26

11:51 am-11:33 pm

1 stop11h 42m

Lambert-St Louis

Wed 1/28

5:42 pm-10:41 am

1 stop16h 59m

$159

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 4/9

10:12 am-10:33 pm

1 stop12h 21m

Lambert-St Louis

Sat 4/11

3:30 pm-9:02 am

1 stop17h 32m

$162

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Sat 2/21

8:10 am-1:45 pm

1 stop5h 35m

Lambert-St Louis

Sat 2/21

2:50 pm-7:40 pm

1 stop4h 50m

$163

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Sat 2/7

6:25 am-2:05 pm

1 stop7h 40m

Lambert-St Louis

Mon 2/9

6:45 pm-7:55 pm

Nonstop1h 10m

$167

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Sat 2/7

4:15 pm-5:43 pm

Nonstop1h 28m

Lambert-St Louis

Sat 2/14

11:25 am-12:58 pm

Nonstop1h 33m

$171

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 2/26

7:18 am-8:41 am

Nonstop1h 23m

Lambert-St Louis

Thu 3/5

8:00 am-9:31 am

Nonstop1h 31m

$172

SpringfieldSt. Louis

SPI - STL

SPISTL

Springfield Capital

Tue 6/16

6:00 am-8:26 pm

1 stop14h 26m

Lambert-St Louis

Sun 6/21

1:11 pm-2:20 pm

1 stop49h 09m

$646

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 St. Louis from

How to get the cheapest flight ticket from Illinois to St. Louis

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 St. Louis?

In general, December is the cheapest month to fly from Illinois to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $217. The month of November is another great option to travel to St. Louis, with average flight prices from Illinois averaging around $240.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Friday when prices can be found for as low as $310. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $457. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from Illinois at noon is the least expensive time of day to depart. momondo users have found prices as low as $302 when looking at flights departing at noon. In the morning is when there is more demand to fly to St. Louis, so prices are often more expensive at around $373 per ticket.

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

Fly from Chicago O'Hare Intl to Lambert-St Louis for the best Illinois - Lambert-St Louis flight prices

How far in advance should I book a flight to St. Louis?

You are more likely to see cheaper flights to St. Louis from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $295 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Illinois for as low as $167 on momondo.

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

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

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

Cheap Illinois to St. Louis flight deals and tips

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

Best Price Found

$193

Fastest flight time

1h 10m

Direct flights

Every day

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from Illinois in the past 72 hours is $193. The best round-trip flight deal from Illinois to St. Louis found on momondo in the last 72 hours is $61.
The fastest flight from Illinois to St. Louis takes 1h 10m
Direct flights go from Illinois to St. Louis every day.
There is 1 airport in St. Louis. From Illinois there are direct flights to Lambert-St Louis (STL).
Search flight deals

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

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

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

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

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Illinois to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The required travel and health documents for your Lambert-St Louis Airport 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 Lambert-St Louis Airport. 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 Illinois to St. Louis?

Best airlines flying from Illinois to St. Louis

Compare and see reviews for airlines that fly from Illinois to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
SouthwestPriceFrom $77Free CancellationRating
8.0
4,255 reviews
Search Southwest flights
American AirlinesPriceFrom $115Free CancellationRating
7.2
11,110 reviews
Search American Airlines flights
United AirlinesPriceFrom $144Free CancellationRating
7.4
9,144 reviews
Search United Airlines flights
Southern / MokulelePriceFrom $150Free CancellationRating
0.0
0 reviews
Search Southern / Mokulele flights

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
Florissant
Maryland Heights
O'Fallon
Fenton
Collinsville
St. Peters
Wentzville
Alton
Farmington
Clayton
Eureka
Edwardsville
Festus
Glencoe
Litchfield
Shrewsbury

Why use momondo?

Why should I use momondo to find a flight deal from Illinois to St. Louis?

It is quick and easy to find Illinois to St. Louis flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to St. Louis that suits you.

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

All flight searches from Illinois to St. Louis on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Illinois to St. Louis?

Once all potential Illinois to St. Louis flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Yes momondo offers price alerts on flights to St. Louis from Illinois. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your St. Louis trip

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