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Cheap flights from St. Louis to Chicago from $49

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 12/24. 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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0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
6:00 am - 7:27 amSTL-ORD
1h 27mnonstop
American Airlines Logo
8:55 pm - 10:09 pmORD-STL
1h 14mnonstop
$138American Airlines
Find Deal
Tue, Feb 10 - Wed, Feb 18
United Airlines Logo
8:05 am - 9:40 amSTL-ORD
1h 35mnonstop
United Airlines Logo
4:24 pm - 5:54 pmORD-STL
1h 30mnonstop
$147United Airlines
Find Deal
Tue, Dec 30 - Thu, Jan 1
American Airlines Logo
8:01 pm - 9:30 pmSTL-ORD
1h 29mnonstop
American Airlines Logo
7:14 am - 8:48 amORD-STL
1h 34mnonstop
$156American Airlines
Find Deal
Thu, Dec 18 - Wed, Dec 31
United Airlines Logo
8:05 am - 9:40 amSTL-ORD
1h 35mnonstop
United Airlines Logo
1:00 pm - 2:30 pmORD-STL
1h 30mnonstop
$157United Airlines
Find Deal
Sat, Jan 17 - Sun, Jan 18
Multiple Airlines Logo
5:11 pm - 5:52 pmSTL-ORD
24h 41m1 stop
Multiple Airlines Logo
10:39 am - 10:34 pmORD-STL
11h 55m1 stop
$158Multiple Airlines
Find Deal
Wed, Jan 7 - Wed, Jan 14
Multiple Airlines Logo
5:11 pm - 5:52 pmSTL-ORD
24h 41m1 stop
Multiple Airlines Logo
10:39 am - 10:34 pmORD-STL
11h 55m1 stop
$159Multiple Airlines
Find Deal
Wed, Jan 7 - Wed, Jan 14
Delta Logo
11:23 am - 9:05 pmSTL-ORD
9h 42m2 stops
Delta Logo
5:30 am - 11:05 amORD-STL
5h 35m1 stop
$162Delta
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Sat, Jan 17 - Sun, Jan 18
Frontier Logo
3:43 pm - 10:39 pmSTL-ORD
6h 56m1 stop
Frontier Logo
8:51 pm - 7:54 amORD-STL
11h 03m1 stop
$163Frontier
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Thu, Jan 8 - Thu, Jan 15
Frontier Logo
3:43 pm - 10:39 pmSTL-ORD
6h 56m1 stop
Frontier Logo
10:41 pm - 12:40 pmORD-STL
13h 59m1 stop
$164Frontier
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Thu, Jan 8 - Thu, Jan 15
American Airlines Logo
6:00 am - 7:26 amSTL-ORD
1h 26mnonstop
American Airlines Logo
12:28 pm - 1:54 pmORD-STL
1h 26mnonstop
$165American Airlines
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Fri, Feb 20 - Mon, Feb 23

United Airlines flights from St. Louis to Chicago O'Hare Intl Airport

Our best United Airlines deals on St. Louis to Chicago O'Hare Intl Airport flight tickets
United Airlines
Dec 31
STL6:30 amLambert-St Louis
1h 35m
ORD8:05 amChicago O'Hare Intl
Jan 1
ORD9:10 pmChicago O'Hare Intl
1h 33m
STL10:43 pmLambert-St Louis
$97
Find similar
United Airlines
Dec 24
STL6:30 amLambert-St Louis
1h 35m
ORD8:05 amChicago O'Hare Intl
Dec 24
ORD12:56 pmChicago O'Hare Intl
1h 30m
STL2:26 pmLambert-St Louis
$127
Find similar
United Airlines
Dec 30
STL8:05 amLambert-St Louis
1h 35m
ORD9:40 amChicago O'Hare Intl
Jan 1
ORD4:24 pmChicago O'Hare Intl
1h 30m
STL5:54 pmLambert-St Louis
$147
Find similar

American Airlines flights from St. Louis to Chicago O'Hare Intl Airport

Our best American Airlines deals on St. Louis to Chicago O'Hare Intl Airport flight tickets
American Airlines
Feb 10
STL6:00 amLambert-St Louis
1h 27m
ORD7:27 amChicago O'Hare Intl
Feb 18
ORD8:55 pmChicago O'Hare Intl
1h 14m
STL10:09 pmLambert-St Louis
$138
Find similar
American Airlines
Dec 18
STL8:01 pmLambert-St Louis
1h 29m
ORD9:30 pmChicago O'Hare Intl
Dec 31
ORD7:14 amChicago O'Hare Intl
1h 34m
STL8:48 amLambert-St Louis
$156
Find similar
American Airlines
Feb 20
STL6:00 amLambert-St Louis
1h 26m
ORD7:26 amChicago O'Hare Intl
Feb 23
ORD12:28 pmChicago O'Hare Intl
1h 26m
STL1:54 pmLambert-St Louis
$165
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Chicago O'Hare Intl Airport 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 November 25, 2025.
Use the filters below to find and compare flights from St. Louis to Chicago O'Hare Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Tue 2/10

6:00 am-7:27 am

Nonstop1h 27m

Chicago O'Hare Intl

Wed 2/18

8:55 pm-10:09 pm

Nonstop1h 14m

$138

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Tue 12/30

8:05 am-9:40 am

Nonstop1h 35m

Chicago O'Hare Intl

Thu 1/1

4:24 pm-5:54 pm

Nonstop1h 30m

$147

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Thu 12/18

8:01 pm-9:30 pm

Nonstop1h 29m

Chicago O'Hare Intl

Wed 12/31

7:14 am-8:48 am

Nonstop1h 34m

$156

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Sat 1/17

8:05 am-9:40 am

Nonstop1h 35m

Chicago O'Hare Intl

Sun 1/18

1:00 pm-2:30 pm

Nonstop1h 30m

$157

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Wed 1/7

5:11 pm-5:52 pm

1 stop24h 41m

Chicago O'Hare Intl

Wed 1/14

10:39 am-10:34 pm

1 stop11h 55m

$158

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Wed 1/7

5:11 pm-5:52 pm

1 stop24h 41m

Chicago O'Hare Intl

Wed 1/14

10:39 am-10:34 pm

1 stop11h 55m

$159

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Sat 1/17

11:23 am-9:05 pm

2 stops9h 42m

Chicago O'Hare Intl

Sun 1/18

5:30 am-11:05 am

1 stop5h 35m

$162

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Thu 1/8

3:43 pm-10:39 pm

1 stop6h 56m

Chicago O'Hare Intl

Thu 1/15

8:51 pm-7:54 am

1 stop11h 03m

$163

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Thu 1/8

3:43 pm-10:39 pm

1 stop6h 56m

Chicago O'Hare Intl

Thu 1/15

10:41 pm-12:40 pm

1 stop13h 59m

$164

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Fri 2/20

6:00 am-7:26 am

Nonstop1h 26m

Chicago O'Hare Intl

Mon 2/23

12:28 pm-1:54 pm

Nonstop1h 26m

$165

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 O'Hare Intl Airport

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 typical price of a round-trip flight between St. Louis and Chicago O'Hare Intl Airport?

What is the cheapest month to fly to Chicago O'Hare Intl Airport?

The month of April is another great option to travel to Chicago O'Hare Intl Airport, with average flight prices from St. Louis averaging around $236.

What is the cheapest day to depart on your flight to Chicago O'Hare Intl Airport?

The cheapest day to depart on your flight to Chicago O'Hare Intl Airport is on a Thursday when prices can be found for as low as $774. This is often the case because there is less demand to fly during this day of the week. On the other hand, Monday is the most expensive day to depart from St. Louis because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $960.

What is the cheapest time of day to depart on your flight to Chicago O'Hare Intl Airport?

Flying to Chicago O'Hare Intl Airport from St. Louis in the morning is the least expensive time of day to depart. momondo users have found prices as low as $658 when looking at flights departing in the morning. Try not to purchase tickets at noon because they tend to be around $1,239. Of course, these prices can vary depending on the time of year and what airport you fly to.

What is the cheapest Lambert-St Louis to Chicago O'Hare Intl flight route?

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

How far in advance should I book a flight to Chicago O'Hare Intl Airport?

You are more likely to see cheaper flights to Chicago O'Hare Intl Airport from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Chicago O'Hare Intl Airport for around $281 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Chicago O'Hare Intl Airport from St. Louis for as low as $178 on momondo.

What cabin class options are available on Lambert-St Louis to Chicago O'Hare Intl flights?

There are 4 cabin classes available to choose from on Lambert-St Louis to Chicago O'Hare Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

How have St. Louis to Chicago O'Hare Intl Airport flight prices changed over time?

As of November 2025, prices for St. Louis to Chicago O'Hare Intl Airport flights are approximately 6% more expensive when compared to flights at the same time last year.

When to book flights from St. Louis to Chicago O'Hare Intl Airport

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

Cheap St. Louis to Chicago O'Hare Intl Airport (STL to ORD) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Chicago O'Hare Intl Airport

Best Price Found

$221

Fastest flight time

1h 16m

Direct flights

Every day
The best one-way flight to Chicago O'Hare Intl Airport from St. Louis in the past 72 hours is $221. The best round-trip flight deal from St. Louis to Chicago O'Hare Intl Airport found on momondo in the last 72 hours is $487.
The fastest flight from St. Louis to Chicago O'Hare Intl Airport takes 1h 16m
Direct flights go from St. Louis to Chicago O'Hare Intl Airport every day.
Search flight deals

  • How far is Lambert-St Louis to Chicago O'Hare Intl by plane?

    Lambert-St Louis and Chicago O'Hare Intl are 261.0 mi apart from one another. Typically, this will take 1h 23m by plane in normal conditions.

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

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

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

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

    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 Chicago O'Hare Intl Airport.

  • What documentation or ID do you need to fly to Chicago O'Hare Intl Airport?

    The travel and health documents you'll need for your trip to Chicago O'Hare Intl Airport 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 Chicago O'Hare Intl Airport. 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 Chicago O'Hare Intl Airport?

  • What is the most popular airline from St. Louis to Chicago O'Hare Intl Airport?

Best airlines flying from St. Louis to Chicago O'Hare Intl Airport

Compare and see reviews for airlines that fly from St. Louis to Chicago O'Hare Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $110Free CancellationRating
7.2
11,038 reviews
Search American Airlines flights
United AirlinesPriceFrom $114Free CancellationRating
7.4
9,046 reviews
Search United Airlines flights
Southern / MokulelePriceFrom $140Free CancellationRating
0.0
0 reviews
Search Southern / Mokulele flights

  • United Airlines Flights From St. Louis to Chicago O'Hare Intl Airport

    The lowest priced United Airlines flight from St. Louis to Chicago O'Hare Intl Airport from the last 72 hours was $114. Generally, United Airlines has 44 flights on this route every week with an average price of $309. United Airlines is rated 7.4/10 by our users.

  • American Airlines Flights From St. Louis to Chicago O'Hare Intl Airport

    American Airlines is also a popular choice for this route. American Airlines flight deals for St. Louis to Chicago O'Hare Intl Airport start from as low as $110 round-trip, depending on your selected dates, with average American Airlines deals seen on momondo around $281. American Airlines operates 17 flights to Chicago O'Hare Intl Airport from St. Louis in an average week. Users have rated it 7.2/10 across 11,038 reviews.

Traveling to a place near Chicago?

Book flights to Chicago if you plan to visit one of these locations
Lake Geneva
South Haven
Schaumburg
Rockford
Merrillville
Gurnee
Naperville
Rosemont
Kenosha
New Buffalo
Joliet
Oak Brook
Orland Park
Racine
Hammond
Tinley Park
Janesville
Aurora
Elgin
Benton Harbor

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?

Yes. All flights to Chicago from St. Louis on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

Once all potential St. Louis to Chicago flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Of course. momondo tracks the price of St. Louis to Chicago flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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