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Cheap flights from St. Louis to Chicago from $65

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 Chicago departing on 1/17. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
3:43 pm - 9:24 pm
STL
-
ORD
29h 41m1 stop
Multiple Airlines Logo
10:48 am - 11:33 pm
ORD
-
STL
12h 45m1 stop
$139Multiple Airlines
Sat, Jan 17 - Wed, Jan 21
Multiple Airlines Logo
3:49 pm - 5:46 pm
STL
-
ORD
25h 57m1 stop
Multiple Airlines Logo
8:30 am - 10:27 pm
ORD
-
STL
13h 57m1 stop
$141Multiple Airlines
Mon, Feb 23 - Wed, Feb 25
United Airlines Logo
7:41 am - 9:10 am
STL
-
ORD
1h 29mnonstop
United Airlines Logo
7:40 pm - 9:05 pm
ORD
-
STL
1h 25mnonstop
$153United Airlines
Tue, Feb 17 - Tue, Feb 24
Southwest Logo
10:25 am - 11:35 am
STL
-
MDW
1h 10mnonstop
Southwest Logo
8:15 am - 9:35 am
MDW
-
STL
1h 20mnonstop
$157Southwest
Sat, Jan 17 - Mon, Jan 19
Frontier Logo
10:16 am - 7:58 pm
STL
-
MDW
9h 42m1 stop
Frontier Logo
1:00 pm - 11:33 pm
MDW
-
STL
10h 33m1 stop
$160Frontier
Mon, Jan 26 - Fri, Jan 30
American Airlines Logo
6:00 am - 7:27 am
STL
-
ORD
1h 27mnonstop
American Airlines Logo
4:42 pm - 6:13 pm
ORD
-
STL
1h 31mnonstop
$162American Airlines
Wed, Jan 21 - Sat, Jan 31
Frontier Logo
5:42 pm - 10:35 am
STL
-
ORD
16h 53m1 stop
Frontier Logo
11:51 am - 11:33 pm
ORD
-
STL
11h 42m1 stop
$163Frontier
Thu, Jan 22 - Mon, Jan 26
American Airlines Logo
11:05 am - 12:34 pm
STL
-
ORD
1h 29mnonstop
American Airlines Logo
1:25 pm - 2:50 pm
ORD
-
STL
1h 25mnonstop
$166American Airlines
Sat, Jan 17 - Wed, Jan 21
Southwest Logo
4:30 pm - 5:40 pm
STL
-
MDW
1h 10mnonstop
Southwest Logo
8:15 am - 9:35 am
MDW
-
STL
1h 20mnonstop
$171Southwest
Thu, Feb 5 - Mon, Feb 9
United Airlines Logo
8:05 am - 9:40 am
STL
-
ORD
1h 35mnonstop
United Airlines Logo
2:35 pm - 4:03 pm
ORD
-
STL
1h 28mnonstop
$171United Airlines
Sat, Jan 24 - Sat, Jan 31

Delta flights from St. Louis to Chicago

Our best Delta deals on St. Louis to Chicago flight tickets
Delta
Feb 24
STL6:35 amLambert-St Louis
6h 45m
1 stop
ORD1:20 pmChicago O'Hare Intl
Feb 25
ORD6:51 pmChicago O'Hare Intl
4h 32m
1 stop
STL11:23 pmLambert-St Louis
$173
Find similar
Delta
Feb 18
STL6:10 amLambert-St Louis
7h 10m
2 stops
ORD1:20 pmChicago O'Hare Intl
Feb 25
ORD2:05 pmChicago O'Hare Intl
6h 38m
1 stop
STL8:43 pmLambert-St Louis
$178
Find similar
Delta
Jan 21
STL9:59 amLambert-St Louis
6h 56m
1 stop
ORD4:55 pmChicago O'Hare Intl
Jan 31
ORD6:15 amChicago O'Hare Intl
4h 28m
1 stop
STL10:43 amLambert-St Louis
$182
Find similar

United Airlines flights from St. Louis to Chicago

Our best United Airlines deals on St. Louis to Chicago flight tickets
United Airlines
Feb 17
STL7:41 amLambert-St Louis
1h 29m
ORD9:10 amChicago O'Hare Intl
Feb 24
ORD7:40 pmChicago O'Hare Intl
1h 25m
STL9:05 pmLambert-St Louis
$153
Find similar
United Airlines
Jan 24
STL8:05 amLambert-St Louis
1h 35m
ORD9:40 amChicago O'Hare Intl
Jan 31
ORD2:35 pmChicago O'Hare Intl
1h 28m
STL4:03 pmLambert-St Louis
$171
Find similar
United Airlines
Jan 15
STL8:05 amLambert-St Louis
1h 35m
ORD9:40 amChicago O'Hare Intl
Jan 15
ORD2:35 pmChicago O'Hare Intl
1h 28m
STL4:03 pmLambert-St Louis
$199
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Chicago that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated December 28, 2025.
Use the filters below to find and compare flights from St. Louis to Chicago that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Sat 1/17

3:43 pm-9:24 pm

1 stop29h 41m

Chicago O'Hare Intl

Wed 1/21

10:48 am-11:33 pm

1 stop12h 45m

$139

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Mon 2/23

3:49 pm-5:46 pm

1 stop25h 57m

Chicago O'Hare Intl

Wed 2/25

8:30 am-10:27 pm

1 stop13h 57m

$141

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Tue 2/17

7:41 am-9:10 am

Nonstop1h 29m

Chicago O'Hare Intl

Tue 2/24

7:40 pm-9:05 pm

Nonstop1h 25m

$153

St. LouisChicago

STL - MDW

STLMDW

Lambert-St Louis

Sat 1/17

10:25 am-11:35 am

Nonstop1h 10m

Chicago Midway

Mon 1/19

8:15 am-9:35 am

Nonstop1h 20m

$157

St. LouisChicago

STL - MDW

STLMDW

Lambert-St Louis

Mon 1/26

10:16 am-7:58 pm

1 stop9h 42m

Chicago Midway

Fri 1/30

1:00 pm-11:33 pm

1 stop10h 33m

$160

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Wed 1/21

6:00 am-7:27 am

Nonstop1h 27m

Chicago O'Hare Intl

Sat 1/31

4:42 pm-6:13 pm

Nonstop1h 31m

$162

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Thu 1/22

5:42 pm-10:35 am

1 stop16h 53m

Chicago O'Hare Intl

Mon 1/26

11:51 am-11:33 pm

1 stop11h 42m

$163

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Sat 1/17

11:05 am-12:34 pm

Nonstop1h 29m

Chicago O'Hare Intl

Wed 1/21

1:25 pm-2:50 pm

Nonstop1h 25m

$166

St. LouisChicago

STL - MDW

STLMDW

Lambert-St Louis

Thu 2/5

4:30 pm-5:40 pm

Nonstop1h 10m

Chicago Midway

Mon 2/9

8:15 am-9:35 am

Nonstop1h 20m

$171

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Sat 1/24

8:05 am-9:40 am

Nonstop1h 35m

Chicago O'Hare Intl

Sat 1/31

2:35 pm-4:03 pm

Nonstop1h 28m

$171

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Chicago from

How to get the cheapest flight ticket from St. Louis to Chicago

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 Chicago?

The month of August is, on average, the cheapest month to fly to Chicago from St. Louis, with most prices found around $199. If you’re not able to fly to Chicago in August, then January is your next best option. Flight prices from St. Louis to Chicago during January average around $230.

What is the cheapest day to depart on your flight to Chicago?

The cheapest day to depart on your flight to Chicago is on a Thursday when prices can be found for as low as $673. This is often the case because there is less demand to fly during this day of the week. When flying out on a Monday, the most expensive travel day of the week, you can expect to see flight prices from St. Louis to Chicago for around $894.

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

Our most recent data shows that the best time of day to fly to Chicago is in the morning. Flights from St. Louis to Chicago during this time can be as low as $601. In contrast, the most expensive time of day to depart to Chicago is at noon when prices are around $1,202.

What is the cheapest Lambert-St Louis to Chicago flight route?

Fly from Lambert-St Louis to Chicago O'Hare Intl for the best Lambert-St Louis - Chicago flight prices

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

You are more likely to see cheaper flights to Chicago from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Chicago for around $278 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Chicago from St. Louis for as low as $178 on momondo.

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

There are 4 cabin classes available to choose from on Lambert-St Louis to Chicago 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 Chicago flights?

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

How have St. Louis to Chicago flight prices changed over time?

As of December 2025, prices for St. Louis to Chicago flights are approximately 10% more expensive when compared to flights at the same time last year.

When to book flights from St. Louis to Chicago

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Chicago according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Chicago (STL to CHI) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Chicago

Best Price Found

$224

Fastest flight time

1h 05m

Direct flights

Every day

Airports in Chicago

3 airports
The best one-way flight to Chicago from St. Louis in the past 72 hours is $224. The best round-trip flight deal from St. Louis to Chicago found on momondo in the last 72 hours is $317.
The fastest flight from St. Louis to Chicago takes 1h 05m
Direct flights go from St. Louis to Chicago every day.
There are 3 airports in Chicago. From St. Louis there are direct flights to Chicago O'Hare Intl (ORD), Chicago Midway (MDW).
Search flight deals

  • Is flying the fastest way to get from St. Louis to Chicago?

    The quickest way is to book a flight from St. Louis to Chicago, which can be as quick as 1h 10m onboard Southwest. You can also get a train from St. Louis to Chicago, or a bus from St. Louis to Chicago which can take you longer to arrive at your destination.

  • Is flying the cheapest way to get from St. Louis to Chicago?

    Taking a train to your destination is the cheapest option we’ve found in the past few days. The cheapest price we’ve found for this option is $54, making it less expensive than a flight from St. Louis to Chicago and cheaper than a bus from St. Louis to Chicago.

  • How far is Lambert-St Louis to Chicago by plane?

    Lambert-St Louis and Chicago are 262.0 mi apart from one another. Flights usually cover this in 1h 05m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Chicago?

    Prices for flights from Lambert-St Louis Airport to Chicago are refreshed on a daily basis.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Chicago?

  • How old do you have to be to fly from Lambert-St Louis Airport to Chicago?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Lambert-St Louis Airport to Chicago.

  • What documentation or ID do you need to fly to Chicago?

    The travel and health documents required for your trip to Chicago can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Chicago. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular plane model from St. Louis to Chicago?

  • What is the most popular airline from St. Louis to Chicago?

Best airlines flying from St. Louis to Chicago

Compare and see reviews for airlines that fly from St. Louis to Chicago with momondo
Airline
Rating
Free Cancellation
Price
SouthwestPriceFrom $97Free CancellationRating
8.0
4,256 reviews
Search Southwest flights
American AirlinesPriceFrom $106Free CancellationRating
7.2
11,072 reviews
Search American Airlines flights
United AirlinesPriceFrom $114Free CancellationRating
7.4
9,117 reviews
Search United Airlines flights
Southern / MokulelePriceFrom $140Free CancellationRating
0.0
0 reviews
Search Southern / Mokulele flights

  • Southwest Flights From St. Louis to Chicago

    Southwest flight deals from St. Louis to Chicago start from $97 round-trip. Over the 24 Southwest flights for this route in a normal week, average airfare is usually $303 round-trip - but some users have found much cheaper deals with momondo.

  • United Airlines Flights From St. Louis to Chicago

    United Airlines (7.4/10 from 9,117 reviews) operates around 35 flights from St. Louis to Chicago in any given week. The average United Airlines airfare for this route is around $308, with deals from around $114 rare but found on momondo. Referenced prices are for round-trip St. Louis to Chicago flight searches in the last 72 hours.

Traveling to a place near Chicago?

Book flights to Chicago if you plan to visit one of these locations
Merrillville
New Buffalo
Hammond
Benton Harbor
Saint Joseph
Portage
Lansing
Valparaiso
Schererville
Munster
Crown Point
Chesterton
Monticello
Porter
Griffith
Saint John

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Chicago?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Chicago from St. Louis.

Can I find flights from St. Louis to Chicago with flexible booking policies on momondo?

All flight searches from St. Louis to Chicago on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from St. Louis to Chicago?

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 Chicago from St. Louis.

I’m not ready to book a flight from St. Louis to Chicago right now. Can momondo alert me if prices change?

If you are not ready to book a flight from St. Louis to Chicago now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Chicago and let you know when they change.

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Find better results for your trip to the United States

Fly into one of these airports located in Chicago

Airports listed have a maximum distance of 78.5 mi from Chicago
Chicago Midway Airport
Chicago O'Hare Intl Airport
Chicago Greater Rockford Airport