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Cheap flights from St. Louis to Illinois from $63

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Illinois departing on 12/26. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from St. Louis to Illinois

Cheap round-trip flights

These are some of the best round-trip flight deals from St. Louis to Illinois that have been recently found on momondo from popular airlines, departing in the coming months.

Cheap one-way flights

Flying one-way? These are some of the best deals recently discovered on momondo for flights from St. Louis to Illinois.

Cheap last minute flights

Planning a quick getaway from St. Louis to Illinois? These are the last-minute flight deals available now.

Cheap direct flights

If you prefer a non-stop journey, check out our latest direct flight deals to Illinois, so you can enjoy a seamless trip without layovers.

Cheap bus & train deals from St. Louis to Illinois

Find recent round-trip train or bus tickets from St. Louis to Illinois.

All round-trip flight deals to Illinois

The cheapest plane tickets to Illinois found on KAYAK recently.
8:35 pm - 9:35 pmSTL-UIN
1h 00mnonstop
11:10 am - 12:10 pmUIN-STL
1h 00mnonstop
$108Southern / Mokulele
Find Deal
Thu, Dec 5 - Thu, Dec 12
12:15 pm - 3:50 pmSTL-ORD
3h 35m1 stop
8:25 am - 7:55 pmORD-STL
11h 30m1 stop
$125Southern / Mokulele
Find Deal
Wed, Jan 1 - Fri, Jan 10
8:34 pm - 11:48 amSTL-MDW
15h 14m1 stop
11:33 am - 11:33 pmMDW-STL
12h 00m1 stop
$148Frontier
Find Deal
Thu, Dec 12 - Mon, Dec 16
5:05 pm - 9:52 amSTL-ORD
16h 47m1 stop
4:18 pm - 11:31 pmORD-STL
7h 13m1 stop
$157Frontier
Find Deal
Sat, Jan 18 - Sun, Jan 19
5:45 am - 7:14 amSTL-ORD
1h 29mnonstop
8:15 am - 9:36 amORD-STL
1h 21mnonstop
$247American Airlines
Find Deal
Tue, Dec 31 - Wed, Jan 1
2:27 pm - 7:24 pmSTL-ORD
4h 57m1 stop
10:00 am - 11:32 amORD-STL
1h 32mnonstop
$257American Airlines
Find Deal
Tue, Dec 31 - Wed, Jan 1
4:40 pm - 10:20 pmSTL-MDW
5h 40m1 stop
6:00 am - 11:47 amMDW-STL
5h 47m1 stop
$264Delta
Find Deal
Sat, Jan 18 - Sun, Jan 19
6:00 am - 10:12 amSTL-MDW
4h 12m1 stop
6:00 am - 11:47 amMDW-STL
5h 47m1 stop
$265Delta
Find Deal
Sat, Jan 18 - Sun, Jan 19
12:41 pm - 2:14 pmSTL-ORD
1h 33mnonstop
12:45 pm - 2:14 pmORD-STL
1h 29mnonstop
$305United Airlines
Find Deal
Sat, Jan 18 - Sun, Jan 19
11:30 am - 12:59 pmSTL-ORD
1h 29mnonstop
2:20 pm - 3:47 pmORD-STL
1h 27mnonstop
$308United Airlines
Find Deal
Sun, Dec 22 - Sun, Dec 29
12:15 pm - 3:50 pmSTL-ORD
3h 35m1 stop
$63Southern / Mokulele
Find Deal
Thu, Dec 26
5:00 pm - 7:40 amSTL-ORD
14h 40m1 stop
$68Southern / Mokulele
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Fri, Dec 27
8:52 pm - 5:31 amSTL-MDW
8h 39m1 stop
$74Frontier
Find Deal
Sat, Feb 15
3:34 pm - 9:02 pmSTL-MDW
5h 28m1 stop
$84Frontier
Find Deal
Fri, Dec 13
5:30 pm - 6:55 pmSTL-ORD
1h 25mnonstop
$124United Airlines
Find Deal
Wed, Dec 25
6:04 am - 11:08 amSTL-MDW
5h 04m1 stop
$133Delta
Find Deal
Tue, Dec 24
10:13 am - 4:40 pmSTL-ORD
6h 27m1 stop
$133Delta
Find Deal
Wed, Dec 25
5:27 pm - 6:49 pmSTL-ORD
1h 22mnonstop
$149United Airlines
Find Deal
Fri, Dec 27
10:16 am - 11:37 amSTL-ORD
1h 21mnonstop
$152American Airlines
Find Deal
Fri, Jan 3
10:15 am - 11:41 amSTL-ORD
1h 26mnonstop
$160American Airlines
Find Deal
Sun, Dec 15
1:00 pm - 2:00 pmSTL-UIN
1h 00mnonstop
11:10 am - 12:10 pmUIN-STL
1h 00mnonstop
$152Southern / Mokulele
Find Deal
Tue, Nov 26 - Thu, Nov 28
8:35 pm - 9:35 pmSTL-UIN
1h 00mnonstop
7:50 am - 8:50 amUIN-STL
1h 00mnonstop
$158Southern / Mokulele
Find Deal
Tue, Nov 26 - Thu, Nov 28
9:34 am - 8:52 pmSTL-MDW
11h 18m1 stop
7:00 am - 12:06 amMDW-STL
17h 06m1 stop
$584Frontier
Find Deal
Wed, Nov 27 - Fri, Nov 29
6:30 am - 7:59 amSTL-ORD
1h 29mnonstop
10:50 am - 12:19 pmORD-STL
1h 29mnonstop
$607United Airlines
Find Deal
Thu, Nov 28 - Sun, Dec 1
7:05 am - 2:24 pmSTL-ORD
7h 19m1 stop
8:55 pm - 10:10 pmORD-STL
1h 15mnonstop
$617American Airlines
Find Deal
Tue, Nov 26 - Mon, Dec 2
1:09 pm - 5:54 pmSTL-MDW
4h 45m1 stop
1:30 pm - 5:15 pmMDW-STL
3h 45m1 stop
$626Delta
Find Deal
Tue, Nov 26 - Mon, Dec 2
6:00 am - 10:32 amSTL-ORD
4h 32m1 stop
7:05 am - 6:15 pmORD-STL
11h 10m2 stops
$631Delta
Find Deal
Thu, Nov 28 - Sat, Nov 30
9:34 am - 8:52 pmSTL-MDW
11h 18m1 stop
12:44 pm - 9:17 pmMDW-STL
8h 33m1 stop
$650Frontier
Find Deal
Wed, Nov 27 - Sat, Nov 30
3:44 pm - 5:05 pmSTL-ORD
1h 21mnonstop
3:09 pm - 4:25 pmORD-STL
1h 16mnonstop
$657American Airlines
Find Deal
Fri, Nov 29 - Sun, Dec 1
1:05 pm - 2:35 pmSTL-ORD
1h 30mnonstop
12:45 pm - 2:12 pmORD-STL
1h 27mnonstop
$663United Airlines
Find Deal
Wed, Nov 27 - Thu, Nov 28
1:00 pm - 2:00 pmSTL-UIN
1h 00mnonstop
3:25 pm - 4:25 pmUIN-STL
1h 00mnonstop
$78Southern / Mokulele
Find Deal
Tue, Feb 11 - Sun, Feb 16
8:35 pm - 9:35 pmSTL-UIN
1h 00mnonstop
11:10 am - 12:10 pmUIN-STL
1h 00mnonstop
$108Southern / Mokulele
Find Deal
Thu, Dec 5 - Thu, Dec 12
5:45 am - 7:14 amSTL-ORD
1h 29mnonstop
8:15 am - 9:36 amORD-STL
1h 21mnonstop
$247American Airlines
Find Deal
Tue, Dec 31 - Wed, Jan 1
6:30 am - 7:40 amSTL-MDW
1h 10mnonstop
7:25 pm - 8:40 pmMDW-STL
1h 15mnonstop
$248Southwest
Find Deal
Tue, Dec 31 - Wed, Jan 1
5:45 am - 7:14 amSTL-ORD
1h 29mnonstop
10:00 am - 11:32 amORD-STL
1h 32mnonstop
$272American Airlines
Find Deal
Mon, Dec 30 - Wed, Jan 1
2:50 pm - 4:00 pmSTL-MDW
1h 10mnonstop
10:20 am - 11:35 amMDW-STL
1h 15mnonstop
$273Southwest
Find Deal
Wed, Jan 8 - Sat, Jan 18
6:06 am - 7:25 amSTL-ORD
1h 19mnonstop
10:00 pm - 11:15 pmORD-STL
1h 15mnonstop
$295American Airlines
Find Deal
Thu, Apr 10 - Mon, Apr 14
6:30 am - 7:40 amSTL-MDW
1h 10mnonstop
11:05 am - 12:15 pmMDW-STL
1h 10mnonstop
$296Southwest
Find Deal
Mon, Jan 6 - Fri, Jan 10
2:55 pm - 4:25 pmSTL-ORD
1h 30mnonstop
4:05 pm - 5:36 pmORD-STL
1h 31mnonstop
$305United Airlines
Find Deal
Sat, Jan 18 - Sun, Jan 19
2:55 pm - 4:25 pmSTL-ORD
1h 30mnonstop
10:50 am - 12:16 pmORD-STL
1h 26mnonstop
$307United Airlines
Find Deal
Sat, Jan 18 - Sun, Jan 19

Southern / Mokulele flights from St. Louis to Illinois

Our best Southern / Mokulele deals on St. Louis to Illinois flight tickets
Southern / Mokulele
Dec 5
STL8:35 pmLambert-St Louis
1h 00m
UIN9:35 pmQuincy Regional
Dec 12
UIN11:10 amQuincy Regional
1h 00m
STL12:10 pmLambert-St Louis
Southern / Mokulele
Jan 1
STL12:15 pmLambert-St Louis
3h 35m
1 stop
ORD3:50 pmChicago O'Hare Intl
Jan 10
ORD8:25 amChicago O'Hare Intl
11h 30m
1 stop
STL7:55 pmLambert-St Louis
Southern / Mokulele
Jan 9
STL12:15 pmLambert-St Louis
3h 35m
1 stop
ORD3:50 pmChicago O'Hare Intl
Jan 16
ORD8:25 amChicago O'Hare Intl
11h 30m
1 stop
STL7:55 pmLambert-St Louis

Frontier flights from St. Louis to Illinois

Our best Frontier deals on St. Louis to Illinois flight tickets
Frontier
Dec 12
STL8:34 pmLambert-St Louis
15h 14m
1 stop
MDW11:48 amChicago Midway
Dec 16
MDW11:33 amChicago Midway
12h 00m
1 stop
STL11:33 pmLambert-St Louis
Frontier
Jan 18
STL5:05 pmLambert-St Louis
16h 47m
1 stop
ORD9:52 amChicago O'Hare Intl
Jan 19
ORD4:18 pmChicago O'Hare Intl
7h 13m
1 stop
STL11:31 pmLambert-St Louis
Frontier
Jan 18
STL5:05 pmLambert-St Louis
16h 47m
1 stop
ORD9:52 amChicago O'Hare Intl
Jan 19
ORD4:18 pmChicago O'Hare Intl
7h 13m
1 stop
STL11:31 pmLambert-St Louis

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 day to depart on your flight to Illinois?

The cheapest day to depart from St. Louis to Illinois is on a Tuesday when prices can be found for as low as $202. Flights from St. Louis to Illinois on a Sunday will generally be more expensive and average around $287. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

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

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

There are 4 cabin classes available to choose from on Lambert-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?

You could potentially save up to 38% on your flight if you consider stops on a St. Louis to Illinois flight.

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

$63

Fastest flight time

1h 00m

Direct flights

Every day

Airports in Illinois

3 airports
The best one-way flight to Illinois from St. Louis in the past 72 hours is $63. The best round-trip flight deal from St. Louis to Illinois found on momondo in the last 72 hours is $108.
The fastest flight from St. Louis to Illinois takes 1h 00m
Direct flights go from St. Louis to Illinois every day.
There are 3 airports near Illinois: Chicago O'Hare Intl (ORD), Chicago Midway (MDW), Quincy Regional (UIN)

  • 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 $115Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
Southern / MokulelePriceFrom $118Free CancellationRating
6.8
29 reviews
Search Southern / Mokulele flights
United AirlinesPriceFrom $119Free CancellationRating
7.4
9,156 reviews
Search United Airlines flights
SouthwestPriceFrom $168Free CancellationRating
8.1
4,984 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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