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.

$70 CHEAP FLIGHTS from Illinois to St. Louis

Save 25% or more on flights. Compare deals from all over the web.

Never overpay with our price tracking tools.

Filter searches by price, airline and more to find your best flights.

Flight Deals

Cheap Flights from Illinois to St. Louis

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

Mon, Nov 9 - Thu, Nov 12

9:51 am - 11:16 pmORD Chicago O'Hare Intl-STL Lambert-St Louis

13h 25m1 stop Orlando

12:14 pm - 7:15 pmSTL Lambert-St Louis-ORD Chicago O'Hare Intl

7h 01m1 stop Dallas/Fort Worth

$188Frontier

Thu, Nov 12 - Sun, Nov 15

9:30 am - 10:53 amORD Chicago O'Hare Intl-STL Lambert-St Louis

1h 23mnonstop

8:15 pm - 9:51 pmSTL Lambert-St Louis-ORD Chicago O'Hare Intl

1h 36mnonstop

$189American Airlines

Thu, Nov 12 - Sun, Nov 15

10:00 pm - 11:24 pmORD Chicago O'Hare Intl-STL Lambert-St Louis

1h 24mnonstop

7:30 am - 9:00 amSTL Lambert-St Louis-ORD Chicago O'Hare Intl

1h 30mnonstop

$189United Airlines

Sun, Dec 20 - Mon, Dec 21

9:10 pm - 10:32 pmORD Chicago O'Hare Intl-STL Lambert-St Louis

1h 22mnonstop

6:00 am - 7:33 amSTL Lambert-St Louis-ORD Chicago O'Hare Intl

1h 33mnonstop

$189American Airlines

Sat, Nov 21 - Sun, Nov 22

6:40 pm - 8:04 pmORD Chicago O'Hare Intl-STL Lambert-St Louis

1h 24mnonstop

8:12 pm - 9:48 pmSTL Lambert-St Louis-ORD Chicago O'Hare Intl

1h 36mnonstop

$189American Airlines

Thu, Nov 12 - Sun, Nov 15

5:15 pm - 12:33 pmORD Chicago O'Hare Intl-STL Lambert-St Louis

19h 18m1 stop Las Vegas Harry Reid Intl

4:26 pm - 8:46 amSTL Lambert-St Louis-ORD Chicago O'Hare Intl

16h 20m1 stop Orlando

$197Frontier

Fri, Nov 20 - Thu, Dec 17

8:55 am - 10:32 amORD Chicago O'Hare Intl-STL Lambert-St Louis

1h 37mnonstop

5:05 am - 6:43 amSTL Lambert-St Louis-ORD Chicago O'Hare Intl

1h 38mnonstop

$198United Airlines

Thu, Nov 12 - Sun, Nov 15

5:15 pm - 12:33 pmORD Chicago O'Hare Intl-STL Lambert-St Louis

19h 18m1 stop Las Vegas Harry Reid Intl

4:26 pm - 8:46 amSTL Lambert-St Louis-ORD Chicago O'Hare Intl

16h 20m1 stop Orlando

$198Frontier

Fri, Nov 20 - Sun, Nov 22

11:10 am - 12:20 pmMDW Chicago Midway-STL Lambert-St Louis

1h 10mnonstop

9:35 pm - 10:45 pmSTL Lambert-St Louis-MDW Chicago Midway

1h 10mnonstop

$238Southwest

Fri, Nov 20 - Sun, Nov 22

11:10 am - 12:20 pmMDW Chicago Midway-STL Lambert-St Louis

1h 10mnonstop

5:45 am - 6:55 amSTL Lambert-St Louis-MDW Chicago Midway

1h 10mnonstop

$238Southwest

Recent last minute flight deals from Illinois to St. Louis

Wed, Oct 28 - Sat, Oct 31

6:30 am - 3:23 pmORD Chicago O'Hare Intl-STL Lambert-St Louis

8h 53m1 stop Denver Intl

4:26 pm - 9:46 amSTL Lambert-St Louis-ORD Chicago O'Hare Intl

17h 20m1 stop Orlando

$290Frontier

Fri, Oct 23 - Sat, Nov 7

10:26 am - 5:40 pmORD Chicago O'Hare Intl-STL Lambert-St Louis

7h 14m1 stop Atlanta Hartsfield-Jackson

7:59 pm - 12:21 amSTL Lambert-St Louis-ORD Chicago O'Hare Intl

28h 22m1 stop Denver Intl

$299Frontier

Wed, Oct 28 - Thu, Oct 29

6:30 am - 3:23 pmORD Chicago O'Hare Intl-STL Lambert-St Louis

8h 53m1 stop Denver Intl

4:26 pm - 8:46 amSTL Lambert-St Louis-ORD Chicago O'Hare Intl

16h 20m1 stop Orlando

$330Frontier

Tue, Oct 27 - Thu, Oct 29

3:28 pm - 4:53 pmORD Chicago O'Hare Intl-STL Lambert-St Louis

1h 25mnonstop

1:30 pm - 3:03 pmSTL Lambert-St Louis-ORD Chicago O'Hare Intl

1h 33mnonstop

$469American Airlines

Tue, Oct 27 - Thu, Oct 29

4:50 pm - 6:16 pmORD Chicago O'Hare Intl-STL Lambert-St Louis

1h 26mnonstop

5:40 am - 12:08 pmSTL Lambert-St Louis-ORD Chicago O'Hare Intl

6h 28m1 stop Dallas/Fort Worth

$478American Airlines

Tue, Oct 27 - Thu, Oct 29

12:05 pm - 6:43 pmORD Chicago O'Hare Intl-STL Lambert-St Louis

6h 38m1 stop Charlotte Douglas

5:40 am - 11:09 amSTL Lambert-St Louis-ORD Chicago O'Hare Intl

5h 29m1 stop Dallas/Fort Worth

$488American Airlines

Tue, Oct 27 - Wed, Oct 28

8:55 am - 10:32 amORD Chicago O'Hare Intl-STL Lambert-St Louis

1h 37mnonstop

6:00 am - 7:36 amSTL Lambert-St Louis-ORD Chicago O'Hare Intl

1h 36mnonstop

$525United Airlines

Mon, Oct 26 - Wed, Oct 28

2:12 pm - 3:43 pmORD Chicago O'Hare Intl-STL Lambert-St Louis

1h 31mnonstop

10:53 am - 12:29 pmSTL Lambert-St Louis-ORD Chicago O'Hare Intl

1h 36mnonstop

$527United Airlines

Tue, Oct 27 - Tue, Oct 27

9:40 am - 10:50 amMDW Chicago Midway-STL Lambert-St Louis

1h 10mnonstop

4:05 pm - 5:10 pmSTL Lambert-St Louis-MDW Chicago Midway

1h 05mnonstop

$543Southwest

Tue, Oct 27 - Tue, Oct 27

9:40 am - 10:50 amMDW Chicago Midway-STL Lambert-St Louis

1h 10mnonstop

12:15 pm - 4:55 pmSTL Lambert-St Louis-MDW Chicago Midway

4h 40m1 stop Nashville Intl

$553Southwest

Recent direct flight deals from Illinois to St. Louis

Thu, Nov 12 - Sun, Nov 15

9:30 am - 10:53 amORD Chicago O'Hare Intl-STL Lambert-St Louis

1h 23mnonstop

8:15 pm - 9:51 pmSTL Lambert-St Louis-ORD Chicago O'Hare Intl

1h 36mnonstop

$189American Airlines

Sun, Dec 20 - Mon, Dec 21

9:10 pm - 10:32 pmORD Chicago O'Hare Intl-STL Lambert-St Louis

1h 22mnonstop

6:00 am - 7:33 amSTL Lambert-St Louis-ORD Chicago O'Hare Intl

1h 33mnonstop

$189American Airlines

Thu, Nov 12 - Sun, Nov 15

10:00 pm - 11:24 pmORD Chicago O'Hare Intl-STL Lambert-St Louis

1h 24mnonstop

7:30 am - 9:00 amSTL Lambert-St Louis-ORD Chicago O'Hare Intl

1h 30mnonstop

$189United Airlines

Sat, Nov 21 - Sun, Nov 22

6:40 pm - 8:04 pmORD Chicago O'Hare Intl-STL Lambert-St Louis

1h 24mnonstop

8:12 pm - 9:48 pmSTL Lambert-St Louis-ORD Chicago O'Hare Intl

1h 36mnonstop

$189American Airlines

Thu, Nov 12 - Sun, Nov 15

9:30 am - 10:53 amORD Chicago O'Hare Intl-STL Lambert-St Louis

1h 23mnonstop

8:15 pm - 9:51 pmSTL Lambert-St Louis-ORD Chicago O'Hare Intl

1h 36mnonstop

$190American Airlines

Fri, Nov 20 - Thu, Dec 17

8:55 am - 10:32 amORD Chicago O'Hare Intl-STL Lambert-St Louis

1h 37mnonstop

5:05 am - 6:43 amSTL Lambert-St Louis-ORD Chicago O'Hare Intl

1h 38mnonstop

$198United Airlines

Fri, Nov 20 - Sun, Nov 22

11:10 am - 12:20 pmMDW Chicago Midway-STL Lambert-St Louis

1h 10mnonstop

9:35 pm - 10:45 pmSTL Lambert-St Louis-MDW Chicago Midway

1h 10mnonstop

$238Southwest

Fri, Nov 20 - Sun, Nov 22

11:10 am - 12:20 pmMDW Chicago Midway-STL Lambert-St Louis

1h 10mnonstop

5:45 am - 6:55 amSTL Lambert-St Louis-MDW Chicago Midway

1h 10mnonstop

$238Southwest

Fri, Nov 20 - Thu, Dec 17

11:10 am - 12:20 pmMDW Chicago Midway-STL Lambert-St Louis

1h 10mnonstop

5:40 am - 6:50 amSTL Lambert-St Louis-MDW Chicago Midway

1h 10mnonstop

$238Southwest

Wed, Dec 9 - Fri, Dec 11

8:45 pm - 10:00 pmMDW Chicago Midway-STL Lambert-St Louis

1h 15mnonstop

9:35 pm - 10:45 pmSTL Lambert-St Louis-MDW Chicago Midway

1h 10mnonstop

$241Southwest

Useful Info

Low season	January
High season	July
Cheapest flight	$70

Best time to beat the crowds with an average 8% drop in price.

Most popular time to fly with an average 5% increase in price.

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.