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Cheap flights from St. Louis to Illinois from $59

1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from St. Louis to Illinois

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
5:00 am - 6:29 amSTL  Lambert-St Louis-ORD Chicago O'Hare Intl
1h 29mnonstop
American Airlines Logo
11:05 pm - 12:27 amORD  Chicago O'Hare Intl-STL Lambert-St Louis
1h 22mnonstop
$117American Airlines
Thu, Sep 24 - Mon, Sep 28
American Airlines Logo
6:00 am - 7:34 amSTL  Lambert-St Louis-ORD Chicago O'Hare Intl
1h 34mnonstop
American Airlines Logo
6:03 pm - 7:22 pmORD  Chicago O'Hare Intl-STL Lambert-St Louis
1h 19mnonstop
$117American Airlines
Sat, Dec 5 - Mon, Dec 7
United Airlines Logo
5:36 pm - 7:05 pmSTL  Lambert-St Louis-ORD Chicago O'Hare Intl
1h 29mnonstop
United Airlines Logo
7:50 pm - 9:21 pmORD  Chicago O'Hare Intl-STL Lambert-St Louis
1h 31mnonstop
$117United Airlines
Tue, Oct 6 - Tue, Oct 13
Southwest Logo
10:00 pm - 11:05 pmSTL  Lambert-St Louis-MDW Chicago Midway
1h 05mnonstop
Southwest Logo
10:05 pm - 11:20 pmMDW  Chicago Midway-STL Lambert-St Louis
1h 15mnonstop
$117Southwest
Thu, Oct 1 - Thu, Oct 8
Southwest Logo
8:50 pm - 10:00 pmSTL  Lambert-St Louis-MDW Chicago Midway
1h 10mnonstop
Southwest Logo
8:50 pm - 10:05 pmMDW  Chicago Midway-STL Lambert-St Louis
1h 15mnonstop
$117Southwest
Tue, Oct 6 - Tue, Oct 13
American Airlines Logo
7:26 am - 9:00 amSTL  Lambert-St Louis-ORD Chicago O'Hare Intl
1h 34mnonstop
American Airlines Logo
4:59 pm - 6:29 pmORD  Chicago O'Hare Intl-STL Lambert-St Louis
1h 30mnonstop
$117American Airlines
Thu, Dec 10 - Wed, Jan 13
Frontier Logo
5:53 pm - 12:31 amSTL  Lambert-St Louis-ORD Chicago O'Hare Intl
6h 38m1 stop Dallas/Fort Worth
Frontier Logo
6:20 am - 4:58 pmORD  Chicago O'Hare Intl-STL Lambert-St Louis
10h 38m1 stop Dallas/Fort Worth
$118Frontier
Mon, Oct 19 - Thu, Oct 22
Frontier Logo
6:35 pm - 11:43 pmSTL  Lambert-St Louis-MDW Chicago Midway
5h 08m1 stop Atlanta Hartsfield-Jackson
Frontier Logo
6:15 am - 5:40 pmMDW  Chicago Midway-STL Lambert-St Louis
11h 25m1 stop Atlanta Hartsfield-Jackson
$118Frontier
Wed, Oct 21 - Mon, Oct 26
United Airlines Logo
11:35 am - 1:11 pmSTL  Lambert-St Louis-ORD Chicago O'Hare Intl
1h 36mnonstop
United Airlines Logo
10:40 am - 12:13 pmORD  Chicago O'Hare Intl-STL Lambert-St Louis
1h 33mnonstop
$134United Airlines
Fri, Oct 2 - Tue, Oct 6
United Airlines Logo
11:35 am - 1:11 pmSTL  Lambert-St Louis-ORD Chicago O'Hare Intl
1h 36mnonstop
United Airlines Logo
10:40 am - 12:13 pmORD  Chicago O'Hare Intl-STL Lambert-St Louis
1h 33mnonstop
$144United Airlines
Wed, Oct 14 - Fri, Oct 23

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American Airlines flights from St. Louis to Illinois

Our best American Airlines deals on St. Louis to Illinois flight tickets
American Airlines
Sep 24
STL5:00 amLambert-St Louis
1h 29m
ORD6:29 amChicago O'Hare Intl
Sep 28
ORD11:05 pmChicago O'Hare Intl
1h 22m
STL12:27 amLambert-St Louis
$117
American Airlines
Sep 25
STL7:21 amLambert-St Louis
1h 38m
ORD8:59 amChicago O'Hare Intl
Sep 30
ORD8:55 amChicago O'Hare Intl
1h 23m
STL10:18 amLambert-St Louis
$134
American Airlines
Oct 2
STL5:00 amLambert-St Louis
1h 29m
ORD6:29 amChicago O'Hare Intl
Oct 6
ORD9:29 amChicago O'Hare Intl
1h 21m
STL10:50 amLambert-St Louis
$144

Frontier flights from St. Louis to Illinois

Our best Frontier deals on St. Louis to Illinois flight tickets
Frontier
Oct 19
STL5:53 pmLambert-St Louis
6h 38m
1 stop
ORD12:31 amChicago O'Hare Intl
Oct 22
ORD6:20 amChicago O'Hare Intl
10h 38m
1 stop
STL4:58 pmLambert-St Louis
$118
Frontier
Oct 22
STL5:53 pmLambert-St Louis
6h 33m
1 stop
ORD12:26 amChicago O'Hare Intl
Oct 23
ORD6:20 amChicago O'Hare Intl
10h 38m
1 stop
STL4:58 pmLambert-St Louis
$135
Frontier
Sep 25
STL2:29 pmLambert-St Louis
9h 15m
1 stop
MDW11:44 pmChicago Midway
Sep 28
MDW6:25 amChicago Midway
6h 45m
1 stop
STL1:10 pmLambert-St Louis
$144

momondo Fare Finder

 
Use the filters below to find and compare flights from St. Louis to Illinois that are best for you.

Fly from

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Route

Depart

Return

Price

Cheapest round-trip

St. LouisChicago

STL Lambert-St Louis - ORD Chicago O'Hare Intl

STLORD

Lambert-St Louis

Thu 9/24

5:00 am-6:29 am

Nonstop1h 29m

Chicago O'Hare Intl

Mon 9/28

11:05 pm-12:27 am

Nonstop1h 22m

$117

St. LouisChicago

STL Lambert-St Louis - ORD Chicago O'Hare Intl

STLORD

Lambert-St Louis

Sat 12/5

6:00 am-7:34 am

Nonstop1h 34m

Chicago O'Hare Intl

Mon 12/7

6:03 pm-7:22 pm

Nonstop1h 19m

$117

St. LouisChicago

STL Lambert-St Louis - ORD Chicago O'Hare Intl

STLORD

Lambert-St Louis

Tue 10/6

5:36 pm-7:05 pm

Nonstop1h 29m

Chicago O'Hare Intl

Tue 10/13

7:50 pm-9:21 pm

Nonstop1h 31m

$117
Quickest round-trip

St. LouisChicago

STL Lambert-St Louis - MDW Chicago Midway

STLMDW

Lambert-St Louis

Thu 10/1

10:00 pm-11:05 pm

Nonstop1h 05m

Chicago Midway

Thu 10/8

10:05 pm-11:20 pm

Nonstop1h 15m

$117

St. LouisChicago

STL Lambert-St Louis - MDW Chicago Midway

STLMDW

Lambert-St Louis

Tue 10/6

8:50 pm-10:00 pm

Nonstop1h 10m

Chicago Midway

Tue 10/13

8:50 pm-10:05 pm

Nonstop1h 15m

$117

St. LouisChicago

STL Lambert-St Louis - ORD Chicago O'Hare Intl

STLORD

Lambert-St Louis

Thu 12/10

7:26 am-9:00 am

Nonstop1h 34m

Chicago O'Hare Intl

Wed 1/13

4:59 pm-6:29 pm

Nonstop1h 30m

$117

St. LouisChicago

STL Lambert-St Louis - ORD Chicago O'Hare Intl

STLORD

Lambert-St Louis

Mon 10/19

5:53 pm-12:31 am

1 stop6h 38m

Chicago O'Hare Intl

Thu 10/22

6:20 am-4:58 pm

1 stop10h 38m

$118

St. LouisChicago

STL Lambert-St Louis - MDW Chicago Midway

STLMDW

Lambert-St Louis

Wed 10/21

6:35 pm-11:43 pm

1 stop5h 08m

Chicago Midway

Mon 10/26

6:15 am-5:40 pm

1 stop11h 25m

$118

St. LouisChicago

STL Lambert-St Louis - ORD Chicago O'Hare Intl

STLORD

Lambert-St Louis

Fri 10/2

11:35 am-1:11 pm

Nonstop1h 36m

Chicago O'Hare Intl

Tue 10/6

10:40 am-12:13 pm

Nonstop1h 33m

$134

St. LouisChicago

STL Lambert-St Louis - ORD Chicago O'Hare Intl

STLORD

Lambert-St Louis

Wed 10/14

11:35 am-1:11 pm

Nonstop1h 36m

Chicago O'Hare Intl

Fri 10/23

10:40 am-12:13 pm

Nonstop1h 33m

$144

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 September. Flight prices, which tend to average around $300, 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 September, then flying in October is also cheap. Prices for this month can be found on momondo for an average of $306.

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 Friday when prices can be found for as low as $620. Flights from St. Louis to Illinois on a Saturday will generally be more expensive and average around $814. 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 $576. Flights at noon are often more expensive with an average ticket price of $1,139.

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 from St. Louis 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 $353 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 $97 on momondo.

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

There are 4 cabin classes available to choose from on 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

$59

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 $59. The best round-trip flight deal from St. Louis to Illinois found on momondo in the last 72 hours is $117.
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

Frequently asked questions about flying from St. Louis to Illinois

  • 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
American AirlinesPriceFrom $97Free CancellationRating
7.1
12,040 reviews
Search American Airlines flights
United AirlinesPriceFrom $117Free CancellationRating
7.4
10,180 reviews
Search United Airlines flights
SouthwestPriceFrom $181Free CancellationRating
8.0
4,196 reviews
Search Southwest 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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