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Cheap flights from Chicago O'Hare Intl Airport to St. Louis 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 Chicago O'Hare Intl Airport to St. Louis departing on 10/15. 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

United Airlines Logo
2:20 pm - 3:44 pmORD-STL
1h 24mnonstop
United Airlines Logo
3:23 pm - 4:48 pmSTL-ORD
1h 25mnonstop
$97United Airlines
Find Deal
Tue, Oct 14 - Tue, Oct 21
American Airlines Logo
6:53 pm - 8:26 pmORD-STL
1h 33mnonstop
American Airlines Logo
6:00 am - 7:23 amSTL-ORD
1h 23mnonstop
$98American Airlines
Find Deal
Thu, Oct 9 - Mon, Oct 13
Southwest Logo
3:10 pm - 10:05 pmORD-STL
6h 55m1 stop
Southwest Logo
2:55 pm - 9:30 pmSTL-ORD
6h 35m1 stop
$117Southwest
Find Deal
Tue, Oct 7 - Wed, Oct 22
Southwest Logo
7:00 am - 12:30 pmORD-STL
5h 30m1 stop
Southwest Logo
1:45 pm - 10:00 pmSTL-ORD
8h 15m2 stops
$122Southwest
Find Deal
Sat, Oct 25 - Sat, Oct 25
American Airlines Logo
6:53 pm - 8:26 pmORD-STL
1h 33mnonstop
American Airlines Logo
7:16 am - 8:43 amSTL-ORD
1h 27mnonstop
$134American Airlines
Find Deal
Tue, Oct 21 - Fri, Oct 24
Frontier Logo
5:25 am - 1:17 pmORD-STL
7h 52m1 stop
Frontier Logo
4:52 pm - 11:39 pmSTL-ORD
6h 47m1 stop
$139Frontier
Find Deal
Fri, Oct 31 - Fri, Oct 31
Frontier Logo
5:10 am - 3:04 pmORD-STL
9h 54m1 stop
Frontier Logo
4:00 pm - 11:39 pmSTL-ORD
7h 39m1 stop
$143Frontier
Find Deal
Mon, Sep 29 - Thu, Oct 2
United Airlines Logo
2:20 pm - 3:44 pmORD-STL
1h 24mnonstop
United Airlines Logo
6:30 am - 8:00 amSTL-ORD
1h 30mnonstop
$146United Airlines
Find Deal
Mon, Oct 20 - Wed, Oct 22
Southern / Mokulele Logo
1:10 pm - 4:35 pmORD-STL
3h 25m1 stop
Southern / Mokulele Logo
9:20 am - 7:24 amSTL-ORD
22h 04m1 stop
$167Southern / Mokulele
Find Deal
Tue, Oct 14 - Tue, Oct 21
Southern / Mokulele Logo
1:10 pm - 12:00 pmORD-STL
22h 50m1 stop
Southern / Mokulele Logo
1:00 pm - 7:24 amSTL-ORD
18h 24m1 stop
$168Southern / Mokulele
Find Deal
Thu, Oct 2 - Sun, Oct 5

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

Our best Southwest deals on Chicago O'Hare Intl Airport to St. Louis flight tickets
Southwest
Oct 7
ORD3:10 pmChicago O'Hare Intl
6h 55m
1 stop
STL10:05 pmLambert-St Louis
Oct 22
STL2:55 pmLambert-St Louis
6h 35m
1 stop
ORD9:30 pmChicago O'Hare Intl
$117
Find similar
Southwest
Oct 25
ORD7:00 amChicago O'Hare Intl
5h 30m
1 stop
STL12:30 pmLambert-St Louis
Oct 25
STL1:45 pmLambert-St Louis
8h 15m
2 stops
ORD10:00 pmChicago O'Hare Intl
$122
Find similar
Southwest
Oct 7
ORD3:10 pmChicago O'Hare Intl
6h 55m
1 stop
STL10:05 pmLambert-St Louis
Oct 22
STL8:20 amLambert-St Louis
8h 25m
2 stops
ORD4:45 pmChicago O'Hare Intl
$189
Find similar

Southern / Mokulele flights from Chicago O'Hare Intl Airport to St. Louis

Our best Southern / Mokulele deals on Chicago O'Hare Intl Airport to St. Louis flight tickets
Southern / Mokulele
Sep 21
ORD8:15 amChicago O'Hare Intl
3h 45m
1 stop
STL12:00 pmLambert-St Louis
Sep 22
STL1:00 pmLambert-St Louis
18h 24m
1 stop
ORD7:24 amChicago O'Hare Intl
$165
Find similar
Southern / Mokulele
Oct 14
ORD1:10 pmChicago O'Hare Intl
3h 25m
1 stop
STL4:35 pmLambert-St Louis
Oct 21
STL9:20 amLambert-St Louis
22h 04m
1 stop
ORD7:24 amChicago O'Hare Intl
$167
Find similar
Southern / Mokulele
Oct 2
ORD1:10 pmChicago O'Hare Intl
22h 50m
1 stop
STL12:00 pmLambert-St Louis
Oct 5
STL1:00 pmLambert-St Louis
18h 24m
1 stop
ORD7:24 amChicago O'Hare Intl
$168
Find similar

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 September 17, 2025.
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 10/14

2:20 pm-3:44 pm

Nonstop1h 24m

Lambert-St Louis

Tue 10/21

3:23 pm-4:48 pm

Nonstop1h 25m

$97

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 10/9

6:53 pm-8:26 pm

Nonstop1h 33m

Lambert-St Louis

Mon 10/13

6:00 am-7:23 am

Nonstop1h 23m

$98

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 10/7

3:10 pm-10:05 pm

1 stop6h 55m

Lambert-St Louis

Wed 10/22

2:55 pm-9:30 pm

1 stop6h 35m

$117

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Sat 10/25

7:00 am-12:30 pm

1 stop5h 30m

Lambert-St Louis

Sat 10/25

1:45 pm-10:00 pm

2 stops8h 15m

$122

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 10/21

6:53 pm-8:26 pm

Nonstop1h 33m

Lambert-St Louis

Fri 10/24

7:16 am-8:43 am

Nonstop1h 27m

$134

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Fri 10/31

5:25 am-1:17 pm

1 stop7h 52m

Lambert-St Louis

Fri 10/31

4:52 pm-11:39 pm

1 stop6h 47m

$139

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Mon 9/29

5:10 am-3:04 pm

1 stop9h 54m

Lambert-St Louis

Thu 10/2

4:00 pm-11:39 pm

1 stop7h 39m

$143

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Mon 10/20

2:20 pm-3:44 pm

Nonstop1h 24m

Lambert-St Louis

Wed 10/22

6:30 am-8:00 am

Nonstop1h 30m

$146

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 10/14

1:10 pm-4:35 pm

1 stop3h 25m

Lambert-St Louis

Tue 10/21

9:20 am-7:24 am

1 stop22h 04m

$167

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 10/2

1:10 pm-12:00 pm

1 stop22h 50m

Lambert-St Louis

Sun 10/5

1:00 pm-7:24 am

1 stop18h 24m

$168

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, March 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 $244. The month of August is another great option to travel to St. Louis, with average flight prices from Chicago O'Hare Intl Airport averaging around $247.

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 Thursday when prices can be found for as low as $308. 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 Monday because tickets tend to average around $510. 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 in the evening is the least expensive time of day to depart. momondo users have found prices as low as $295 when looking at flights departing in the evening. In the morning is when there is more demand to fly to St. Louis, so prices are often more expensive at around $433 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 $283 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 $142 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 September 2025, prices for Chicago O'Hare Intl Airport to St. Louis flights are approximately 9% cheaper 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

$110

Fastest flight time

1h 19m

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 $110. The best round-trip flight deal from Chicago O'Hare Intl Airport to St. Louis found on momondo in the last 72 hours is $207.
The fastest flight from Chicago O'Hare Intl Airport to St. Louis takes 1h 19m
Direct flights go from Chicago O'Hare Intl Airport to St. Louis every day.
There is 1 airport near St. Louis: 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 21m.

  • 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 $116Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
Southern / MokulelePriceFrom $118Free CancellationRating
6.3
25 reviews
Search Southern / Mokulele flights
United AirlinesPriceFrom $152Free CancellationRating
7.4
8,926 reviews
Search United Airlines 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 $152. Generally, United Airlines has 41 flights on this route every week with an average price of $320. 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 10,000 reviews) operates around 32 flights from Chicago O'Hare Intl Airport to St. Louis in any given week. The average American Airlines airfare for this route is around $288, with deals from around $116 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
Florissant
Maryland Heights
O'Fallon
Fenton
Collinsville
Wentzville
Alton
St. Peters
Farmington
Festus
Glencoe
Clayton
Edwardsville
Eureka
Litchfield
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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