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>

$73 CHEAP FLIGHTS from Illinois to St. Louis

STL

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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.

Round-trip

One-way

Last minute

Direct

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

KAYAK's recommended round-trip deals from the most popular airlines that fly from Illinois to St. Louis.

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

8:25 am - 8:10 pmORD-STL

11h 45m1 stop

12:15 pm - 7:40 amSTL-ORD

19h 25m1 stop

$140Southern / Mokulele

Find Deal

Thu, May 22 - Sun, May 25

8:20 pm - 11:45 amORD-STL

15h 25m1 stop

12:15 pm - 7:40 amSTL-ORD

19h 25m1 stop

$145Southern / Mokulele

Find Deal

Sat, May 24 - Tue, May 27

6:20 am - 2:07 pmMDW-STL

7h 47m1 stop

2:52 pm - 10:28 pmSTL-MDW

7h 36m1 stop

$163Frontier

Find Deal

Sat, Jun 14 - Sat, Jun 21

5:03 pm - 11:44 pmORD-STL

6h 41m1 stop

12:15 pm - 7:40 amSTL-ORD

19h 25m1 stop

$164

Find Deal

Sat, May 24 - Sun, May 25

6:20 am - 1:40 pmMDW-STL

7h 20m1 stop

2:52 pm - 10:35 pmSTL-MDW

7h 43m1 stop

$182Frontier

Find Deal

Sun, Jun 29 - Sat, Jul 5

4:15 pm - 12:06 amORD-STL

7h 51m1 stop

1:00 pm - 4:32 pmSTL-ORD

3h 32m1 stop

$190

Find Deal

Sat, May 17 - Sun, May 18

5:40 pm - 6:55 pmMDW-STL

1h 15mnonstop

8:05 pm - 9:10 pmSTL-MDW

1h 05mnonstop

$217Southwest

Find Deal

Wed, May 21 - Tue, May 27

5:10 pm - 6:27 pmORD-STL

1h 17mnonstop

7:30 am - 8:49 amSTL-ORD

1h 19mnonstop

$217American Airlines

Find Deal

Sat, May 24 - Sun, May 25

2:14 pm - 3:43 pmORD-STL

1h 29mnonstop

7:30 am - 8:49 amSTL-ORD

1h 19mnonstop

$218American Airlines

Find Deal

Sat, May 24 - Sun, May 25

5:40 pm - 6:55 pmMDW-STL

1h 15mnonstop

8:55 pm - 10:00 pmSTL-MDW

1h 05mnonstop

$227Southwest

Find Deal

Wed, May 28 - Fri, May 30

Useful Info

Low season	January
High season	May
Cheapest flight	$73

Best time to beat the crowds with an average 2% drop in price.

Most popular time to fly and prices are also 8% lower on average.

Flight from Chicago O'Hare 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.

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

$73 Find Cheap Flights from Illinois to St. Louis

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

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.

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