How does KAYAK find such low prices on flights from Illinois to St. Louis?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Illinois to St. Louis. Visit our flight page for the latest deals!>/a>

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to St. Louis?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Louis from Illinois is likely to change within 7 days, so travelers know whether to wait or book now. Visit our flight page for the latest deals!>/a>

What is the Hacker Fare option on flights from Illinois to St. Louis?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to St. Louis with an airline and back to Illinois with another airline. Visit our flight page for the latest deals!>/a>

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to St. Louis?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to St. Louis from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best. Visit our flight page for the latest deals!>/a>

$49 CHEAP FLIGHTS from Illinois to St. Louis

STL

KAYAK searches hundreds of travel sites at once for deals on flights to St. Louis

...and more

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Filter your dealsChoose cabin class, free Wi-Fi and more.

Cheapest round-trip

$138

Typical prices: $198-$485

Southwest

Sun 1/18Wed 1/21

MDW - STL • Non-stop

Cheapest one-way

$49

Typical prices: $88-$252

Southwest

Wed 12/31

MDW - STL • Non-stop

Start a new search

KAYAK searches 100s of sites at once to find you the best travel deals.

We hope you love your trip to St. Louis!

Flight Deals

Cheap Flights from Illinois to St. Louis

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Illinois to St. Louis that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Direct

Recent round-trip flight deals from Illinois to St. Louis

Sun, Jan 18 - Wed, Jan 21

9:55 am - 11:15 amMDW-STL

1h 20mnonstop

1:10 pm - 2:15 pmSTL-MDW

1h 05mnonstop

$138Southwest

Find Deal

Sat, Feb 7 - Sat, Feb 21

4:42 pm - 6:13 pmORD-STL

1h 31mnonstop

10:04 am - 11:31 amSTL-ORD

1h 27mnonstop

$138American Airlines

Find Deal

Wed, Dec 31 - Tue, Jan 13

12:10 pm - 1:36 pmORD-STL

1h 26mnonstop

11:05 am - 12:34 pmSTL-ORD

1h 29mnonstop

$141American Airlines

Find Deal

Wed, Jan 7 - Wed, Jan 14

12:09 pm - 10:33 pmORD-STL

10h 24m1 stop

3:43 pm - 9:24 pmSTL-ORD

29h 41m1 stop

$144Multiple Airlines

Find Deal

Wed, Jan 14 - Sat, Jan 17

7:45 pm - 9:00 pmMDW-STL

1h 15mnonstop

5:50 pm - 7:00 pmSTL-MDW

1h 10mnonstop

$147Southwest

Find Deal

Wed, Dec 17 - Wed, Dec 24

6:52 pm - 8:24 pmORD-STL

1h 32mnonstop

6:00 am - 7:27 amSTL-ORD

1h 27mnonstop

$147American Airlines

Find Deal

Fri, Jan 9 - Sun, Jan 11

5:50 am - 2:48 pmORD-STL

8h 58m1 stop

3:43 pm - 11:35 amSTL-ORD

19h 52m1 stop

$154Frontier

Find Deal

Sat, Jan 17 - Sun, Jan 18

1:28 pm - 4:53 pmMDW-STL

3h 25m1 stop

6:10 am - 1:09 pmSTL-MDW

6h 59m1 stop

$157Delta

Find Deal

Sat, Jan 17 - Sun, Jan 18

11:05 am - 4:53 pmORD-STL

5h 48m1 stop

6:35 am - 1:08 pmSTL-ORD

6h 33m1 stop

$157Delta

Find Deal

Wed, Jan 7 - Wed, Jan 14

5:10 pm - 2:48 pmMDW-STL

21h 38m1 stop

8:32 pm - 8:03 amSTL-MDW

11h 31m1 stop

$158Frontier

Find Deal

Useful Info

Low season	January
High season	May
Cheapest flight	$49

Best time to beat the crowds with an average 4% drop in price.

Most popular time to fly and prices are also 2% lower on average.

Flight from Chicago Midway Airport to St. Louis

How does KAYAK find such low prices on flights from Illinois to St. Louis?
KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Illinois to St. Louis.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to St. Louis?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Louis from Illinois is likely to change within 7 days, so travelers know whether to wait or book now.
What is the Hacker Fare option on flights from Illinois to St. Louis?
Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to St. Louis with an airline and back to Illinois with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to St. Louis?
Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to St. Louis from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

O'Fallon

Wentzville

Farmington

Eureka

Litchfield

Grafton

Shrewsbury

Glencoe

Everything you need to know for your flight to St. Louis

Airports

Cabin class

Complete your trip

Direct Flights

Flights to other cities

Origins

Other airports

Information on the airport you'll fly into in St. Louis

St. Louis (STL)

STL

$49 Find Cheap Flights from Illinois to St. Louis

KAYAK searches hundreds of travel sites at once for deals on flights to St. Louis

Everything you should know

Cheap Flights from Illinois to St. Louis

Recent round-trip flight deals from Illinois to St. Louis

Recent one-way flight deals from Illinois to St. Louis

Recent last minute flight deals from Illinois to St. Louis

Recent direct flight deals from Illinois to St. Louis

Good to know

FAQs for booking flights from Illinois to St. Louis

How does KAYAK find such low prices on flights from Illinois to St. Louis?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Illinois to St. Louis.

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to St. Louis?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Louis from Illinois is likely to change within 7 days, so travelers know whether to wait or book now.

What is the Hacker Fare option on flights from Illinois to St. Louis?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to St. Louis with an airline and back to Illinois with another airline.

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to St. Louis?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to St. Louis from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Traveling to a place near St. Louis?

Everything you need to know for your flight to St. Louis

Information on the airport you'll fly into in St. Louis

Cabin class types available on flights to Illinois

Complete your trip to St. Louis with a hotel stay or car rental

Find direct flights for St. Louis

Flights to other popular destinations

Flights from domestic origins to St. Louis

Choose which airport to fly into in St. Louis