Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

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 5/19. 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

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from St. Louis to Chicago

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
8:16 pm - 4:06 pm
STL
-
ORD
19h 50m
1 stop
Frontier Logo
6:55 am - 8:55 am
ORD
-
STL
26h 00m
1 stop
$172Frontier
Sat, May 23 - Tue, May 26
Southwest Logo
8:35 am - 3:00 pm
STL
-
ORD
6h 25m
1 stop
Southwest Logo
2:00 pm - 10:55 pm
ORD
-
STL
8h 55m
1 stop
$174Southwest
Wed, May 13 - Thu, May 14
Multiple Airlines Logo
11:21 am - 10:23 am
STL
-
ORD
23h 02m
1 stop
Multiple Airlines Logo
5:20 am - 7:32 pm
ORD
-
STL
14h 12m
2 stops
$176Multiple Airlines
Thu, Apr 30 - Mon, May 4
Delta Logo
10:19 am - 4:29 pm
STL
-
ORD
6h 10m
1 stop
Delta Logo
2:59 pm - 9:38 pm
ORD
-
STL
6h 39m
1 stop
$177Delta
Wed, May 20 - Wed, May 27
Frontier Logo
5:27 pm - 7:55 am
STL
-
ORD
14h 28m
1 stop
Frontier Logo
4:05 pm - 8:55 am
ORD
-
STL
40h 50m
2 stops
$178Frontier
Mon, May 11 - Mon, May 18
Frontier Logo
4:19 pm - 11:13 pm
STL
-
ORD
6h 54m
1 stop
Frontier Logo
5:30 pm - 12:21 am
ORD
-
STL
6h 51m
1 stop
$180Frontier
Thu, May 14 - Mon, May 18
Frontier Logo
4:19 pm - 11:13 pm
STL
-
ORD
6h 54m
1 stop
Frontier Logo
6:50 am - 4:54 pm
ORD
-
STL
10h 04m
1 stop
$181Frontier
Sun, May 10 - Sun, May 17
Frontier Logo
11:21 am - 11:59 pm
STL
-
ORD
12h 38m
2 stops
Frontier Logo
4:28 pm - 5:36 pm
ORD
-
STL
25h 08m
1 stop
$182Frontier
Thu, Apr 30 - Mon, May 4
Multiple Airlines Logo
6:33 pm - 7:55 am
STL
-
ORD
13h 22m
1 stop
Multiple Airlines Logo
3:55 pm - 8:55 am
ORD
-
STL
17h 00m
2 stops
$183Multiple Airlines
Tue, May 12 - Tue, May 19
Delta Logo
5:15 pm - 10:27 pm
STL
-
ORD
5h 12m
1 stop
Delta Logo
7:05 am - 11:54 am
ORD
-
STL
4h 49m
1 stop
$184Delta
Tue, May 12 - Sat, May 16

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
Apr 30
STL8:54 amLambert-St Louis
1h 28m
ORD10:22 amChicago O'Hare Intl
May 4
ORD10:30 pmChicago O'Hare Intl
1h 16m
STL11:46 pmLambert-St Louis
$192
American Airlines
Apr 30
STL5:51 amLambert-St Louis
1h 30m
ORD7:21 amChicago O'Hare Intl
May 4
ORD10:30 pmChicago O'Hare Intl
1h 16m
STL11:46 pmLambert-St Louis
$193
American Airlines
Apr 30
STL8:54 amLambert-St Louis
1h 28m
ORD10:22 amChicago O'Hare Intl
May 4
ORD10:30 pmChicago O'Hare Intl
1h 16m
STL11:46 pmLambert-St Louis
$194

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

Our best Frontier deals on St. Louis to Chicago O'Hare Intl Airport flight tickets
Frontier
May 23
STL8:16 pmLambert-St Louis
19h 50m
1 stop
ORD4:06 pmChicago O'Hare Intl
May 26
ORD6:55 amChicago O'Hare Intl
26h 00m
1 stop
STL8:55 amLambert-St Louis
$172
Frontier
May 11
STL5:27 pmLambert-St Louis
14h 28m
1 stop
ORD7:55 amChicago O'Hare Intl
May 18
ORD4:05 pmChicago O'Hare Intl
40h 50m
2 stops
STL8:55 amLambert-St Louis
$178
Frontier
Apr 24
STL9:58 pmLambert-St Louis
8h 10m
1 stop
ORD6:08 amChicago O'Hare Intl
Apr 26
ORD5:50 amChicago O'Hare Intl
4h 59m
1 stop
STL10:49 amLambert-St Louis
$180

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 April 12, 2026.
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

Cheapest round-trip

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Sat 5/23

8:16 pm-4:06 pm

1 stop19h 50m

Chicago O'Hare Intl

Tue 5/26

6:55 am-8:55 am

1 stop26h 00m

$172

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Wed 5/13

8:35 am-3:00 pm

1 stop6h 25m

Chicago O'Hare Intl

Thu 5/14

2:00 pm-10:55 pm

1 stop8h 55m

$174

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Thu 4/30

11:21 am-10:23 am

1 stop23h 02m

Chicago O'Hare Intl

Mon 5/4

5:20 am-7:32 pm

2 stops14h 12m

$176

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Wed 5/20

10:19 am-4:29 pm

1 stop6h 10m

Chicago O'Hare Intl

Wed 5/27

2:59 pm-9:38 pm

1 stop6h 39m

$177

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Mon 5/11

5:27 pm-7:55 am

1 stop14h 28m

Chicago O'Hare Intl

Mon 5/18

4:05 pm-8:55 am

2 stops40h 50m

$178

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Thu 5/14

4:19 pm-11:13 pm

1 stop6h 54m

Chicago O'Hare Intl

Mon 5/18

5:30 pm-12:21 am

1 stop6h 51m

$180

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Sun 5/10

4:19 pm-11:13 pm

1 stop6h 54m

Chicago O'Hare Intl

Sun 5/17

6:50 am-4:54 pm

1 stop10h 04m

$181

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Thu 4/30

11:21 am-11:59 pm

2 stops12h 38m

Chicago O'Hare Intl

Mon 5/4

4:28 pm-5:36 pm

1 stop25h 08m

$182

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Tue 5/12

6:33 pm-7:55 am

1 stop13h 22m

Chicago O'Hare Intl

Tue 5/19

3:55 pm-8:55 am

2 stops17h 00m

$183
Quickest round-trip

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Tue 5/12

5:15 pm-10:27 pm

1 stop5h 12m

Chicago O'Hare Intl

Sat 5/16

7:05 am-11:54 am

1 stop4h 49m

$184

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 August is another great option to travel to Chicago O'Hare Intl Airport, with average flight prices from St. Louis averaging around $247.

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 $692. 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 $845.

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 $596 when looking at flights departing in the morning. Try not to purchase tickets at noon because they tend to be around $1,105. 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 $308 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 $194 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 April 2026, prices for St. Louis to Chicago O'Hare Intl Airport flights are approximately 72% 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

$230

Fastest flight time

1h 27m

Direct flights

Every day
The best one-way flight to Chicago O'Hare Intl Airport from St. Louis in the past 72 hours is $230. The best round-trip flight deal from St. Louis to Chicago O'Hare Intl Airport found on momondo in the last 72 hours is $421.
The fastest flight from St. Louis to Chicago O'Hare Intl Airport takes 1h 27m
Direct flights go from St. Louis to Chicago O'Hare Intl Airport every day.
Search flight deals

Frequently asked questions about flying from St. Louis to Chicago O'Hare Intl Airport

  • 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 27m 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 $97Free CancellationRating
7.1
11,571 reviews
Search American Airlines flights
United AirlinesPriceFrom $125Free CancellationRating
7.4
9,573 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 $125. Generally, United Airlines has 40 flights on this route every week with an average price of $350. 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 $97 round-trip, depending on your selected dates, with average American Airlines deals seen on momondo around $297. American Airlines operates 50 flights to Chicago O'Hare Intl Airport from St. Louis in an average week. Users have rated it 7.1/10 across 11,570 reviews.

Traveling to a place near Chicago?

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

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.

An easier way to manage your Chicago O'Hare Intl Airport trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Tue 5/12
Tue 5/19
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Chicago