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Cheap flights from St. Louis to Illinois from $39

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 8/21. 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

Southern / Mokulele Logo
5:15 pm - 6:15 pmSTL-UIN
1h 00mnonstop
Southern / Mokulele Logo
3:45 pm - 4:45 pmUIN-STL
1h 00mnonstop
$70Southern / Mokulele
Find Deal
Sun, Aug 10 - Sun, Aug 17
Southern / Mokulele Logo
1:00 pm - 2:00 pmSTL-UIN
1h 00mnonstop
Southern / Mokulele Logo
11:10 am - 12:10 pmUIN-STL
1h 00mnonstop
$78Southern / Mokulele
Find Deal
Sun, Aug 10 - Sun, Aug 17
American Airlines Logo
6:01 am - 7:25 amSTL-ORD
1h 24mnonstop
American Airlines Logo
6:30 pm - 8:00 pmORD-STL
1h 30mnonstop
$91American Airlines
Find Deal
Sat, Nov 8 - Tue, Nov 11
American Airlines Logo
6:00 am - 7:24 amSTL-ORD
1h 24mnonstop
American Airlines Logo
10:10 am - 11:30 amORD-STL
1h 20mnonstop
$92American Airlines
Find Deal
Sat, Aug 30 - Sat, Sep 6
Southwest Logo
7:20 am - 8:30 amSTL-MDW
1h 10mnonstop
Southwest Logo
3:55 pm - 5:10 pmMDW-STL
1h 15mnonstop
$94Southwest
Find Deal
Thu, Aug 21 - Sat, Aug 23
Southwest Logo
5:25 am - 6:35 amSTL-MDW
1h 10mnonstop
Southwest Logo
11:45 am - 12:55 pmMDW-STL
1h 10mnonstop
$97Southwest
Find Deal
Thu, Aug 14 - Thu, Aug 21
United Airlines Logo
5:00 am - 6:30 amSTL-ORD
1h 30mnonstop
United Airlines Logo
2:20 pm - 3:44 pmORD-STL
1h 24mnonstop
$97United Airlines
Find Deal
Thu, Aug 14 - Thu, Aug 21
United Airlines Logo
9:09 am - 10:40 amSTL-ORD
1h 31mnonstop
United Airlines Logo
9:20 pm - 10:45 pmORD-STL
1h 25mnonstop
$154United Airlines
Find Deal
Sat, Aug 9 - Mon, Aug 11
Delta Logo
6:30 am - 1:09 pmSTL-MDW
6h 39m1 stop
Delta Logo
10:35 am - 6:02 pmMDW-STL
7h 27m1 stop
$177Delta
Find Deal
Sat, Nov 8 - Tue, Nov 11
Delta Logo
3:40 pm - 9:36 pmSTL-ORD
5h 56m1 stop
Delta Logo
5:00 pm - 8:33 pmORD-STL
3h 33m1 stop
$177Delta
Find Deal
Wed, Aug 13 - Mon, Aug 18

American Airlines flights from St. Louis to Illinois

Our best American Airlines deals on St. Louis to Illinois flight tickets
American Airlines
Nov 8
STL6:01 amLambert-St Louis
1h 24m
ORD7:25 amChicago O'Hare Intl
Nov 11
ORD6:30 pmChicago O'Hare Intl
1h 30m
STL8:00 pmLambert-St Louis
$91
Find similar
American Airlines
Aug 30
STL6:00 amLambert-St Louis
1h 24m
ORD7:24 amChicago O'Hare Intl
Sep 6
ORD10:10 amChicago O'Hare Intl
1h 20m
STL11:30 amLambert-St Louis
$92
Find similar
American Airlines
Aug 7
STL6:00 amLambert-St Louis
1h 24m
ORD7:24 amChicago O'Hare Intl
Aug 12
ORD7:00 pmChicago O'Hare Intl
1h 25m
STL8:25 pmLambert-St Louis
$94
Find similar

United Airlines flights from St. Louis to Illinois

Our best United Airlines deals on St. Louis to Illinois flight tickets
United Airlines
Aug 14
STL5:00 amLambert-St Louis
1h 30m
ORD6:30 amChicago O'Hare Intl
Aug 21
ORD2:20 pmChicago O'Hare Intl
1h 24m
STL3:44 pmLambert-St Louis
$97
Find similar
United Airlines
Aug 9
STL9:09 amLambert-St Louis
1h 31m
ORD10:40 amChicago O'Hare Intl
Aug 11
ORD9:20 pmChicago O'Hare Intl
1h 25m
STL10:45 pmLambert-St Louis
$154
Find similar
United Airlines
Aug 9
STL5:00 amLambert-St Louis
1h 30m
ORD6:30 amChicago O'Hare Intl
Aug 11
ORD9:20 pmChicago O'Hare Intl
1h 25m
STL10:45 pmLambert-St Louis
$155
Find similar

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 month to fly to Illinois?

The cheapest month to fly to Illinois from St. Louis is in August. Flight prices, which tend to average around $158, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of August, then flying in September is also cheap. Prices for this month can be found on momondo for an average of $193.

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 Thursday when prices can be found for as low as $699. Flights from St. Louis to Illinois on a Tuesday will generally be more expensive and average around $920. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Illinois?

Our most recent data shows that the best time of day to fly to Illinois is in the morning. Flights from St. Louis to Illinois during this time can be as low as $614. Flights at noon are often more expensive with an average ticket price of $1,234.

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

How far in advance should I book a flight to Illinois?

You are more likely to see cheaper flights to Illinois from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $268 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from St. Louis for as low as $183 on momondo.

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?

No. A direct flight is the cheapest option for a flight between St. Louis to Illinois.

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

$39

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 $39. The best round-trip flight deal from St. Louis to Illinois found on momondo in the last 72 hours is $70.
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)
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  • 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 $125Free CancellationRating
6.4
26 reviews
Search Southern / Mokulele flights
United AirlinesPriceFrom $128Free CancellationRating
7.4
8,864 reviews
Search United Airlines flights
SouthwestPriceFrom $168Free CancellationRating
8.0
4,239 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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