STL

$128 Find Cheap Flights from Illinois to St. Louis - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to St. Louis departing on 9/3. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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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.

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

Thu, Jul 30 - Fri, Jul 31
Frontier Logo
6:05 am - 5:37 pm
MDW
-
STL
11h 32m
1 stop
Frontier Logo
4:57 pm - 10:03 pm
STL
-
MDW
5h 06m
1 stop
$300Frontier
Fri, Jul 31 - Sun, Aug 2
Frontier Logo
5:13 pm - 11:59 pm
ORD
-
STL
6h 46m
1 stop
Frontier Logo
4:09 pm - 11:10 pm
STL
-
ORD
7h 01m
1 stop
$300Frontier
Sat, Aug 15 - Sat, Aug 22
Southwest Logo
9:55 am - 4:40 pm
MDW
-
STL
6h 45m
2 stops
Southwest Logo
7:50 am - 1:20 pm
STL
-
MDW
5h 30m
2 stops
$307Southwest
Wed, Aug 26 - Thu, Aug 27
Delta Logo
1:59 pm - 8:42 pm
ORD
-
STL
6h 43m
1 stop
Delta Logo
10:33 am - 4:17 pm
STL
-
ORD
5h 44m
1 stop
$307Delta
Fri, Aug 7 - Wed, Aug 12
American Airlines Logo
11:00 pm - 12:14 am
ORD
-
STL
1h 14mnonstop
American Airlines Logo
8:07 pm - 9:40 pm
STL
-
ORD
1h 33mnonstop
$308American Airlines
Tue, Sep 15 - Fri, Sep 18
American Airlines Logo
11:05 pm - 12:27 am
ORD
-
STL
1h 22mnonstop
American Airlines Logo
8:43 am - 2:20 pm
STL
-
ORD
5h 37m
1 stop
$310American Airlines
Wed, Aug 12 - Tue, Aug 18
Delta Logo
9:24 am - 1:14 pm
MDW
-
STL
3h 50m
1 stop
Delta Logo
8:48 am - 6:33 pm
STL
-
MDW
9h 45m
2 stops
$332Delta
Fri, Aug 14 - Sun, Aug 16
Southwest Logo
7:55 am - 9:15 am
MDW
-
STL
1h 20mnonstop
Southwest Logo
7:30 pm - 8:35 pm
STL
-
MDW
1h 05mnonstop
$337Southwest
Sat, Aug 1 - Fri, Aug 7
Multiple Airlines Logo
8:21 pm - 11:59 pm
SPI
-
STL
27h 38m
1 stop
Multiple Airlines Logo
4:57 pm - 7:41 pm
STL
-
SPI
26h 44m
2 stops
$508Multiple Airlines
Sat, Aug 1 - Fri, Aug 7
Multiple Airlines Logo
8:21 pm - 11:59 pm
SPI
-
STL
27h 38m
1 stop
Multiple Airlines Logo
4:57 pm - 7:41 pm
STL
-
SPI
26h 44m
2 stops
$520Multiple Airlines
Useful Info

Good to know

Low season

January

Cheapest flight

$128
Best time to beat the crowds with an average 2% drop in price.
Most popular time to fly with an average 5% increase in price.
Flight from Chicago O'Hare Airport to St. Louis

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

St. Louis (STL)