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Cheap flights from St. Louis to Chicago from $51

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 11/24. 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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Cheap round-trip flights

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Frontier Logo
7:45 pm - 3:39 pmSTL-ORD
19h 54m1 stop
Frontier Logo
6:05 pm - 9:07 amORD-STL
15h 02m1 stop
$119Frontier
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Mon, Nov 10 - Wed, Nov 12
United Airlines Logo
8:05 am - 9:40 amSTL-ORD
1h 35mnonstop
United Airlines Logo
4:24 pm - 5:54 pmORD-STL
1h 30mnonstop
$136United Airlines
Find Deal
Thu, Jan 1 - Thu, Jan 1
American Airlines Logo
8:01 pm - 9:30 pmSTL-ORD
1h 29mnonstop
American Airlines Logo
8:50 am - 10:20 amORD-STL
1h 30mnonstop
$137American Airlines
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Thu, Dec 18 - Tue, Jan 6
Frontier Logo
7:45 pm - 3:39 pmSTL-ORD
19h 54m1 stop
Frontier Logo
5:15 am - 1:17 pmORD-STL
8h 02m1 stop
$139Frontier
Find Deal
Mon, Nov 10 - Mon, Nov 17
American Airlines Logo
6:00 am - 7:27 amSTL-ORD
1h 27mnonstop
American Airlines Logo
8:52 am - 10:22 amORD-STL
1h 30mnonstop
$154American Airlines
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Wed, Jan 21 - Sat, Jan 31
Frontier Logo
7:45 pm - 3:39 pmSTL-ORD
19h 54m1 stop
Frontier Logo
5:11 am - 4:01 pmORD-STL
10h 50m1 stop
$155Frontier
Find Deal
Mon, Nov 10 - Fri, Nov 14
Delta Logo
7:05 am - 12:10 pmSTL-ORD
5h 05m1 stop
Delta Logo
10:45 am - 5:10 pmORD-STL
6h 25m1 stop
$157Delta
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Thu, Dec 4 - Mon, Dec 8
Frontier Logo
12:04 pm - 5:27 pmSTL-ORD
5h 23m1 stop
Frontier Logo
6:11 am - 10:33 pmORD-STL
16h 22m2 stops
$160Frontier
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Thu, Dec 4 - Mon, Dec 8
United Airlines Logo
6:30 am - 8:05 amSTL-ORD
1h 35mnonstop
United Airlines Logo
9:10 pm - 10:43 pmORD-STL
1h 33mnonstop
$161United Airlines
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Wed, Dec 31 - Wed, Dec 31
Delta Logo
6:00 am - 11:40 amSTL-ORD
5h 40m1 stop
Delta Logo
1:54 pm - 11:25 pmORD-STL
9h 31m2 stops
$162Delta
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Thu, Dec 18 - Tue, Jan 6

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
Nov 10
STL7:45 pmLambert-St Louis
19h 54m
1 stop
ORD3:39 pmChicago O'Hare Intl
Nov 12
ORD6:05 pmChicago O'Hare Intl
15h 02m
1 stop
STL9:07 amLambert-St Louis
$119
Find similar
Frontier
Nov 10
STL7:45 pmLambert-St Louis
19h 54m
1 stop
ORD3:39 pmChicago O'Hare Intl
Nov 17
ORD5:15 amChicago O'Hare Intl
8h 02m
1 stop
STL1:17 pmLambert-St Louis
$139
Find similar
Frontier
Nov 10
STL7:45 pmLambert-St Louis
19h 54m
1 stop
ORD3:39 pmChicago O'Hare Intl
Nov 14
ORD5:11 amChicago O'Hare Intl
10h 50m
1 stop
STL4:01 pmLambert-St Louis
$155
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
Dec 18
STL8:01 pmLambert-St Louis
1h 29m
ORD9:30 pmChicago O'Hare Intl
Jan 6
ORD8:50 amChicago O'Hare Intl
1h 30m
STL10:20 amLambert-St Louis
$137
Find similar
American Airlines
Jan 21
STL6:00 amLambert-St Louis
1h 27m
ORD7:27 amChicago O'Hare Intl
Jan 31
ORD8:52 amChicago O'Hare Intl
1h 30m
STL10:22 amLambert-St Louis
$154
Find similar
American Airlines
Nov 26
STL5:00 amLambert-St Louis
7h 56m
1 stop
ORD12:56 pmChicago O'Hare Intl
Nov 27
ORD6:44 amChicago O'Hare Intl
1h 25m
STL8:09 amLambert-St Louis
$189
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 October 27, 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

Mon 11/10

7:45 pm-3:39 pm

1 stop19h 54m

Chicago O'Hare Intl

Wed 11/12

6:05 pm-9:07 am

1 stop15h 02m

$119

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Thu 1/1

8:05 am-9:40 am

Nonstop1h 35m

Chicago O'Hare Intl

Thu 1/1

4:24 pm-5:54 pm

Nonstop1h 30m

$136

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Thu 12/18

8:01 pm-9:30 pm

Nonstop1h 29m

Chicago O'Hare Intl

Tue 1/6

8:50 am-10:20 am

Nonstop1h 30m

$137

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Mon 11/10

7:45 pm-3:39 pm

1 stop19h 54m

Chicago O'Hare Intl

Mon 11/17

5:15 am-1:17 pm

1 stop8h 02m

$139

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

8:52 am-10:22 am

Nonstop1h 30m

$154

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Mon 11/10

7:45 pm-3:39 pm

1 stop19h 54m

Chicago O'Hare Intl

Fri 11/14

5:11 am-4:01 pm

1 stop10h 50m

$155

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Thu 12/4

7:05 am-12:10 pm

1 stop5h 05m

Chicago O'Hare Intl

Mon 12/8

10:45 am-5:10 pm

1 stop6h 25m

$157

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Thu 12/4

12:04 pm-5:27 pm

1 stop5h 23m

Chicago O'Hare Intl

Mon 12/8

6:11 am-10:33 pm

2 stops16h 22m

$160

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Wed 12/31

6:30 am-8:05 am

Nonstop1h 35m

Chicago O'Hare Intl

Wed 12/31

9:10 pm-10:43 pm

Nonstop1h 33m

$161

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Thu 12/18

6:00 am-11:40 am

1 stop5h 40m

Chicago O'Hare Intl

Tue 1/6

1:54 pm-11:25 pm

2 stops9h 31m

$162

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 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 $246.

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 $783. 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 $961.

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 $655 when looking at flights departing in the morning. Try not to purchase tickets at noon because they tend to be around $1,257. 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 $280 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 October 2025, prices for St. Louis to Chicago O'Hare Intl Airport flights are approximately 30% cheaper 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

$209

Fastest flight time

1h 20m

Direct flights

Every day
The best one-way flight to Chicago O'Hare Intl Airport from St. Louis in the past 72 hours is $209. The best round-trip flight deal from St. Louis to Chicago O'Hare Intl Airport found on momondo in the last 72 hours is $464.
The fastest flight from St. Louis to Chicago O'Hare Intl Airport takes 1h 20m
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 $114Free CancellationRating
7.2
11,032 reviews
Search American Airlines flights
United AirlinesPriceFrom $116Free CancellationRating
7.4
8,996 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 $116. Generally, United Airlines has 51 flights on this route every week with an average price of $313. 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 $114 round-trip, depending on your selected dates, with average American Airlines deals seen on momondo around $276. American Airlines operates 21 flights to Chicago O'Hare Intl Airport from St. Louis in an average week. Users have rated it 7.2/10 across 11,032 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
Elgin
Aurora
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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