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Cheap flights from Chicago O'Hare Intl Airport to St. Louis from $46

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Chicago O'Hare Intl Airport to St. Louis departing on 5/2. 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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Find the cheapest flights from Chicago O'Hare Intl Airport to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
7:40 pm - 9:08 pm
ORD
-
STL
1h 28mnonstop
United Airlines Logo
9:10 am - 10:39 am
STL
-
ORD
1h 29mnonstop
$117United Airlines
Tue, Apr 14 - Tue, Apr 21
American Airlines Logo
10:12 am - 11:35 am
ORD
-
STL
1h 23mnonstop
American Airlines Logo
8:00 am - 9:31 am
STL
-
ORD
1h 31mnonstop
$131American Airlines
Wed, Apr 1 - Sat, Apr 4
Multiple Airlines Logo
12:44 pm - 10:27 pm
ORD
-
STL
9h 43m
1 stop
Multiple Airlines Logo
11:32 am - 5:57 pm
STL
-
ORD
6h 25m
1 stop
$135Multiple Airlines
Wed, Mar 4 - Wed, Mar 11
Southwest Logo
2:40 pm - 7:20 pm
ORD
-
STL
4h 40m
1 stop
Southwest Logo
5:45 am - 11:10 am
STL
-
ORD
5h 25m
1 stop
$137Southwest
Tue, Apr 14 - Tue, Apr 21
Frontier Logo
8:30 am - 10:27 pm
ORD
-
STL
13h 57m
1 stop
Frontier Logo
8:22 pm - 10:51 am
STL
-
ORD
14h 29m
1 stop
$138Frontier
Wed, Feb 25 - Fri, Feb 27
Multiple Airlines Logo
8:16 pm - 11:49 am
ORD
-
STL
39h 33m
2 stops
Multiple Airlines Logo
11:32 am - 5:57 pm
STL
-
ORD
6h 25m
1 stop
$139Multiple Airlines
Wed, Mar 4 - Wed, Mar 11
Frontier Logo
4:42 pm - 6:51 am
ORD
-
STL
14h 09m
1 stop
Frontier Logo
8:22 pm - 4:52 pm
STL
-
ORD
20h 30m
1 stop
$146Frontier
Fri, Feb 20 - Mon, Feb 23
Multiple Airlines Logo
10:44 am - 11:19 pm
ORD
-
STL
12h 35m
1 stop
Multiple Airlines Logo
11:32 am - 5:57 pm
STL
-
ORD
6h 25m
1 stop
$149Multiple Airlines
Tue, Mar 10 - Wed, Mar 11
Frontier Logo
4:42 pm - 6:51 am
ORD
-
STL
14h 09m
1 stop
Frontier Logo
8:20 pm - 10:46 am
STL
-
ORD
14h 26m
1 stop
$151Frontier
Thu, Feb 19 - Fri, Feb 20
Multiple Airlines Logo
6:51 pm - 6:51 am
ORD
-
STL
36h 00m
2 stops
Multiple Airlines Logo
2:09 pm - 8:23 am
STL
-
ORD
18h 14m
1 stop
$156Multiple Airlines
Mon, Mar 2 - Mon, Mar 9

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

Our best United Airlines deals on Chicago O'Hare Intl Airport to St. Louis flight tickets
United Airlines
Apr 14
ORD7:40 pmChicago O'Hare Intl
1h 28m
STL9:08 pmLambert-St Louis
Apr 21
STL9:10 amLambert-St Louis
1h 29m
ORD10:39 amChicago O'Hare Intl
$117
United Airlines
Apr 9
ORD9:30 pmChicago O'Hare Intl
1h 26m
STL10:56 pmLambert-St Louis
Apr 11
STL7:45 amLambert-St Louis
1h 26m
ORD9:11 amChicago O'Hare Intl
$171
United Airlines
Mar 30
ORD7:40 pmChicago O'Hare Intl
1h 28m
STL9:08 pmLambert-St Louis
Apr 4
STL7:45 amLambert-St Louis
1h 26m
ORD9:11 amChicago O'Hare Intl
$183

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

Our best Delta deals on Chicago O'Hare Intl Airport to St. Louis flight tickets
Delta
Apr 14
ORD8:52 amChicago O'Hare Intl
4h 13m
1 stop
STL1:05 pmLambert-St Louis
Apr 21
STL11:43 amLambert-St Louis
4h 59m
1 stop
ORD4:42 pmChicago O'Hare Intl
$157
Delta
Apr 14
ORD8:52 amChicago O'Hare Intl
7h 58m
2 stops
STL4:50 pmLambert-St Louis
Apr 21
STL11:43 amLambert-St Louis
4h 59m
1 stop
ORD4:42 pmChicago O'Hare Intl
$162
Delta
Apr 14
ORD7:00 amChicago O'Hare Intl
9h 50m
2 stops
STL4:50 pmLambert-St Louis
Apr 21
STL6:20 amLambert-St Louis
6h 25m
2 stops
ORD12:45 pmChicago O'Hare Intl
$167

momondo Fare Finder

 
Customize your flight search to find flights from Chicago O'Hare Intl Airport to St. Louis 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 February 4, 2026.
Use the filters below to find and compare flights from Chicago O'Hare Intl Airport to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 4/14

7:40 pm-9:08 pm

Nonstop1h 28m

Lambert-St Louis

Tue 4/21

9:10 am-10:39 am

Nonstop1h 29m

$117

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Wed 4/1

10:12 am-11:35 am

Nonstop1h 23m

Lambert-St Louis

Sat 4/4

8:00 am-9:31 am

Nonstop1h 31m

$131

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Wed 3/4

12:44 pm-10:27 pm

1 stop9h 43m

Lambert-St Louis

Wed 3/11

11:32 am-5:57 pm

1 stop6h 25m

$135

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 4/14

2:40 pm-7:20 pm

1 stop4h 40m

Lambert-St Louis

Tue 4/21

5:45 am-11:10 am

1 stop5h 25m

$137

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Wed 2/25

8:30 am-10:27 pm

1 stop13h 57m

Lambert-St Louis

Fri 2/27

8:22 pm-10:51 am

1 stop14h 29m

$138

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Wed 3/4

8:16 pm-11:49 am

2 stops39h 33m

Lambert-St Louis

Wed 3/11

11:32 am-5:57 pm

1 stop6h 25m

$139

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Fri 2/20

4:42 pm-6:51 am

1 stop14h 09m

Lambert-St Louis

Mon 2/23

8:22 pm-4:52 pm

1 stop20h 30m

$146

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 3/10

10:44 am-11:19 pm

1 stop12h 35m

Lambert-St Louis

Wed 3/11

11:32 am-5:57 pm

1 stop6h 25m

$149

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 2/19

4:42 pm-6:51 am

1 stop14h 09m

Lambert-St Louis

Fri 2/20

8:20 pm-10:46 am

1 stop14h 26m

$151

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Mon 3/2

6:51 pm-6:51 am

2 stops36h 00m

Lambert-St Louis

Mon 3/9

2:09 pm-8:23 am

1 stop18h 14m

$156

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 St. Louis from

How to get the cheapest flight ticket from Chicago O'Hare Intl Airport to St. Louis

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 St. Louis?

In general, December is the cheapest month to fly from Chicago O'Hare Intl Airport to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $213. The month of September is another great option to travel to St. Louis, with average flight prices from Chicago O'Hare Intl Airport averaging around $217.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Friday when prices can be found for as low as $312. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $463. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from Chicago O'Hare Intl Airport at noon is the least expensive time of day to depart. momondo users have found prices as low as $313 when looking at flights departing at noon. In the morning is when there is more demand to fly to St. Louis, so prices are often more expensive at around $368 per ticket.

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

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

How far in advance should I book a flight to St. Louis?

You are more likely to see cheaper flights to St. Louis from Chicago O'Hare Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $301 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Chicago O'Hare Intl Airport for as low as $167 on momondo.

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

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

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

As of February 2026, prices for Chicago O'Hare Intl Airport to St. Louis flights are approximately 43% more expensive when compared to flights at the same time last year.

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

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

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

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

Best Price Found

$218

Fastest flight time

1h 18m

Direct flights

Every day

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from Chicago O'Hare Intl Airport in the past 72 hours is $218. The best round-trip flight deal from Chicago O'Hare Intl Airport to St. Louis found on momondo in the last 72 hours is $396.
The fastest flight from Chicago O'Hare Intl Airport to St. Louis takes 1h 18m
Direct flights go from Chicago O'Hare Intl Airport to St. Louis every day.
There is 1 airport in St. Louis. From Chicago O'Hare Intl Airport there are direct flights to Lambert-St Louis (STL).
Search flight deals

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

    A flight from Chicago O'Hare Intl to Lambert-St Louis will travel around 261.0 mi. By plane, this route typically takes 1h 18m.

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

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

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

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

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Chicago O'Hare Intl Airport to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The travel and health documents required for your trip to Lambert-St Louis Airport 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 Lambert-St Louis Airport. 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 Chicago O'Hare Intl Airport to St. Louis?

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

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

Compare and see reviews for airlines that fly from Chicago O'Hare Intl Airport to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $121Free CancellationRating
7.2
11,229 reviews
Search American Airlines flights
United AirlinesPriceFrom $144Free CancellationRating
7.4
9,236 reviews
Search United Airlines flights
Southern / MokulelePriceFrom $156Free CancellationRating
0.0
0 reviews
Search Southern / Mokulele flights

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

    The lowest priced United Airlines flight from Chicago O'Hare Intl Airport to St. Louis from the last 72 hours was $144. Generally, United Airlines has 52 flights on this route every week with an average price of $334. United Airlines is rated 7.4/10 by our users.

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

    American Airlines (7.2/10 from 11,220 reviews) operates around 19 flights from Chicago O'Hare Intl Airport to St. Louis in any given week. The average American Airlines airfare for this route is around $312, with deals from around $121 rare but found on momondo. Referenced prices are for round-trip Chicago O'Hare Intl Airport to St. Louis flight searches in the last 72 hours.

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
Maryland Heights
Florissant
O'Fallon
Collinsville
St. Peters
Fenton
Wentzville
Alton
Farmington
Clayton
Edwardsville
Eureka
Festus
Litchfield
Glencoe
Shrewsbury

Why use momondo?

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

Finding the right flight to St. Louis from Chicago is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to St. Louis quick and easy, saving you time and money.

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

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

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

Once you have performed a search for Chicago to St. Louis flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Yes momondo offers price alerts on flights to St. Louis from Chicago. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your St. Louis trip

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