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Cheap flights from St. Louis to Chicago from $59

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 7/25. 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
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from St. Louis to Chicago

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
1:55 pm - 8:30 pm
STL
-
ORD
6h 35m
1 stop
Delta Logo
1:55 pm - 8:35 pm
ORD
-
STL
6h 40m
1 stop
$215Delta
Mon, Sep 14 - Thu, Sep 24
Delta Logo
10:19 am - 4:23 pm
STL
-
ORD
6h 04m
1 stop
Delta Logo
11:10 am - 5:19 pm
ORD
-
STL
6h 09m
1 stop
$218Delta
Sat, Jul 25 - Sat, Aug 1
Frontier Logo
10:35 am - 7:44 pm
STL
-
ORD
9h 09m
1 stop
Frontier Logo
2:03 pm - 9:40 am
ORD
-
STL
19h 37m
1 stop
$220Frontier
Mon, Sep 14 - Wed, Sep 23
American Airlines Logo
5:00 am - 6:24 am
STL
-
ORD
1h 24mnonstop
American Airlines Logo
11:00 pm - 12:14 am
ORD
-
STL
1h 14mnonstop
$225American Airlines
Sat, Aug 8 - Mon, Aug 10
United Airlines Logo
5:30 pm - 7:01 pm
STL
-
ORD
1h 31mnonstop
United Airlines Logo
8:30 pm - 10:00 pm
ORD
-
STL
1h 30mnonstop
$226United Airlines
Mon, Sep 14 - Tue, Sep 22
American Airlines Logo
5:18 pm - 7:13 pm
STL
-
ORD
1h 55mnonstop
American Airlines Logo
11:05 pm - 12:27 am
ORD
-
STL
1h 22mnonstop
$227American Airlines
Sun, Sep 27 - Sat, Oct 3
Frontier Logo
8:08 pm - 8:52 pm
STL
-
ORD
24h 44m
1 stop
Frontier Logo
7:05 am - 5:37 pm
ORD
-
STL
10h 32m
1 stop
$230Frontier
Tue, Jul 14 - Tue, Jul 21
Frontier Logo
7:10 pm - 5:37 am
STL
-
ORD
10h 27m
1 stop
Frontier Logo
5:13 pm - 11:59 pm
ORD
-
STL
6h 46m
1 stop
$234Frontier
Fri, Jul 31 - Tue, Aug 4
American Airlines Logo
9:08 am - 10:36 am
STL
-
ORD
1h 28mnonstop
American Airlines Logo
7:04 am - 8:31 am
ORD
-
STL
1h 27mnonstop
$238American Airlines
Mon, Jul 20 - Wed, Jul 22
Frontier Logo
7:10 pm - 5:37 am
STL
-
ORD
10h 27m
1 stop
Frontier Logo
9:57 pm - 7:23 pm
ORD
-
STL
21h 26m
1 stop
$239Frontier
Sat, Aug 8 - Mon, Aug 10

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

Our best Delta deals on St. Louis to Chicago O'Hare Intl Airport flight tickets
Delta
Sep 14
STL1:55 pmLambert-St Louis
6h 35m
1 stop
ORD8:30 pmChicago O'Hare Intl
Sep 24
ORD1:55 pmChicago O'Hare Intl
6h 40m
1 stop
STL8:35 pmLambert-St Louis
$215
Delta
Jul 25
STL10:19 amLambert-St Louis
6h 04m
1 stop
ORD4:23 pmChicago O'Hare Intl
Aug 1
ORD11:10 amChicago O'Hare Intl
6h 09m
1 stop
STL5:19 pmLambert-St Louis
$218
Delta
Sep 14
STL1:55 pmLambert-St Louis
4h 31m
1 stop
ORD6:26 pmChicago O'Hare Intl
Sep 21
ORD8:55 amChicago O'Hare Intl
4h 11m
1 stop
STL1:06 pmLambert-St Louis
$247

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
Sep 14
STL10:35 amLambert-St Louis
9h 09m
1 stop
ORD7:44 pmChicago O'Hare Intl
Sep 23
ORD2:03 pmChicago O'Hare Intl
19h 37m
1 stop
STL9:40 amLambert-St Louis
$220
Frontier
Jul 14
STL8:08 pmLambert-St Louis
24h 44m
1 stop
ORD8:52 pmChicago O'Hare Intl
Jul 21
ORD7:05 amChicago O'Hare Intl
10h 32m
1 stop
STL5:37 pmLambert-St Louis
$230
Frontier
Jul 31
STL7:10 pmLambert-St Louis
10h 27m
1 stop
ORD5:37 amChicago O'Hare Intl
Aug 4
ORD5:13 pmChicago O'Hare Intl
6h 46m
1 stop
STL11:59 pmLambert-St Louis
$234

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 June 28, 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

Mon 9/14

1:55 pm-8:30 pm

1 stop6h 35m

Chicago O'Hare Intl

Thu 9/24

1:55 pm-8:35 pm

1 stop6h 40m

$215

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Sat 7/25

10:19 am-4:23 pm

1 stop6h 04m

Chicago O'Hare Intl

Sat 8/1

11:10 am-5:19 pm

1 stop6h 09m

$218

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Mon 9/14

10:35 am-7:44 pm

1 stop9h 09m

Chicago O'Hare Intl

Wed 9/23

2:03 pm-9:40 am

1 stop19h 37m

$220
Quickest round-trip

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Sat 8/8

5:00 am-6:24 am

Nonstop1h 24m

Chicago O'Hare Intl

Mon 8/10

11:00 pm-12:14 am

Nonstop1h 14m

$225

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Mon 9/14

5:30 pm-7:01 pm

Nonstop1h 31m

Chicago O'Hare Intl

Tue 9/22

8:30 pm-10:00 pm

Nonstop1h 30m

$226

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Sun 9/27

5:18 pm-7:13 pm

Nonstop1h 55m

Chicago O'Hare Intl

Sat 10/3

11:05 pm-12:27 am

Nonstop1h 22m

$227

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Tue 7/14

8:08 pm-8:52 pm

1 stop24h 44m

Chicago O'Hare Intl

Tue 7/21

7:05 am-5:37 pm

1 stop10h 32m

$230

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Fri 7/31

7:10 pm-5:37 am

1 stop10h 27m

Chicago O'Hare Intl

Tue 8/4

5:13 pm-11:59 pm

1 stop6h 46m

$234

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Mon 7/20

9:08 am-10:36 am

Nonstop1h 28m

Chicago O'Hare Intl

Wed 7/22

7:04 am-8:31 am

Nonstop1h 27m

$238

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Sat 8/8

7:10 pm-5:37 am

1 stop10h 27m

Chicago O'Hare Intl

Mon 8/10

9:57 pm-7:23 pm

1 stop21h 26m

$239

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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 December is another great option to travel to Chicago O'Hare Intl Airport, with average flight prices from St. Louis averaging around $258.

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 Friday when prices can be found for as low as $683. 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 $854.

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 $617 when looking at flights departing in the morning. Try not to purchase tickets at noon because they tend to be around $1,149. 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 from St. Louis 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 $322 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 $97 on momondo.

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

There are 4 cabin classes available to choose from on St. Louis to Chicago O'Hare Intl Airport 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 June 2026, prices for St. Louis to Chicago O'Hare Intl Airport flights are approximately 0% 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

$259

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 $259. The best round-trip flight deal from St. Louis to Chicago O'Hare Intl Airport found on momondo in the last 72 hours is $509.
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
11,776 reviews
Search American Airlines flights
United AirlinesPriceFrom $145Free CancellationRating
7.4
9,899 reviews
Search United Airlines 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 $145. Generally, United Airlines has 48 flights on this route every week with an average price of $403. 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 $315. American Airlines operates 25 flights to Chicago O'Hare Intl Airport from St. Louis in an average week. Users have rated it 7.1/10 across 11,774 reviews.

Traveling to a place near Chicago?

Book flights to Chicago if you plan to visit one of these locations
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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.

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