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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 1/1. 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.
Southwest Logo
2:15 pm - 8:00 pmORD-STL
5h 45m1 stop
Southwest Logo
8:25 am - 12:15 pmSTL-ORD
3h 50m1 stop
$121Southwest
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Tue, Dec 9 - Wed, Dec 10
United Airlines Logo
1:00 pm - 2:29 pmORD-STL
1h 29mnonstop
United Airlines Logo
8:21 am - 9:54 amSTL-ORD
1h 33mnonstop
$127United Airlines
Find Deal
Thu, Feb 12 - Sat, Feb 14
Frontier Logo
6:00 am - 9:07 amORD-STL
27h 07m1 stop
Frontier Logo
3:14 pm - 12:08 amSTL-ORD
8h 54m1 stop
$129Frontier
Find Deal
Mon, Nov 17 - Thu, Nov 20
Frontier Logo
2:26 pm - 10:33 pmORD-STL
8h 07m1 stop
Frontier Logo
12:07 pm - 8:17 pmSTL-ORD
8h 10m1 stop
$130Frontier
Find Deal
Sat, Dec 6 - Mon, Dec 8
American Airlines Logo
11:12 am - 12:44 pmORD-STL
1h 32mnonstop
American Airlines Logo
5:40 pm - 7:20 pmSTL-ORD
1h 40mnonstop
$156American Airlines
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Tue, Dec 9 - Tue, Dec 9
Delta Logo
1:35 pm - 8:41 pmORD-STL
7h 06m1 stop
Delta Logo
6:35 am - 1:07 pmSTL-ORD
6h 32m1 stop
$157Delta
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Wed, Dec 31 - Tue, Jan 13
American Airlines Logo
8:05 am - 9:33 amORD-STL
1h 28mnonstop
American Airlines Logo
9:58 am - 11:25 amSTL-ORD
1h 27mnonstop
$161American Airlines
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Sun, Mar 1 - Tue, Mar 3
Delta Logo
1:35 pm - 8:41 pmORD-STL
7h 06m1 stop
Delta Logo
6:10 am - 1:07 pmSTL-ORD
6h 57m2 stops
$162Delta
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Wed, Dec 31 - Tue, Jan 13
Multiple Airlines Logo
6:48 am - 10:33 pmORD-STL
15h 45m1 stop
Multiple Airlines Logo
3:30 pm - 6:46 pmSTL-ORD
27h 16m2 stops
$195Multiple Airlines
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Tue, Dec 2 - Tue, Dec 9
Multiple Airlines Logo
6:00 am - 2:29 pmORD-STL
8h 29m1 stop
Multiple Airlines Logo
3:30 pm - 4:03 pmSTL-ORD
24h 33m1 stop
$206Multiple Airlines
Find Deal
Tue, Nov 25 - Tue, Dec 2

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
Feb 12
ORD1:00 pmChicago O'Hare Intl
1h 29m
STL2:29 pmLambert-St Louis
Feb 14
STL8:21 amLambert-St Louis
1h 33m
ORD9:54 amChicago O'Hare Intl
$127
Find similar
United Airlines
Dec 6
ORD8:10 pmChicago O'Hare Intl
1h 30m
STL9:40 pmLambert-St Louis
Dec 8
STL6:42 pmLambert-St Louis
1h 30m
ORD8:12 pmChicago O'Hare Intl
$164
Find similar
United Airlines
Dec 30
ORD9:10 pmChicago O'Hare Intl
1h 33m
STL10:43 pmLambert-St Louis
Jan 13
STL6:40 pmLambert-St Louis
1h 43m
ORD8:23 pmChicago O'Hare Intl
$170
Find similar

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

Our best Frontier deals on Chicago O'Hare Intl Airport to St. Louis flight tickets
Frontier
Nov 17
ORD6:00 amChicago O'Hare Intl
27h 07m
1 stop
STL9:07 amLambert-St Louis
Nov 20
STL3:14 pmLambert-St Louis
8h 54m
1 stop
ORD12:08 amChicago O'Hare Intl
$129
Find similar
Frontier
Dec 6
ORD2:26 pmChicago O'Hare Intl
8h 07m
1 stop
STL10:33 pmLambert-St Louis
Dec 8
STL12:07 pmLambert-St Louis
8h 10m
1 stop
ORD8:17 pmChicago O'Hare Intl
$130
Find similar
Frontier
Dec 4
ORD5:05 amChicago O'Hare Intl
6h 02m
1 stop
STL11:07 amLambert-St Louis
Dec 8
STL10:47 amLambert-St Louis
11h 37m
1 stop
ORD10:24 pmChicago O'Hare Intl
$131
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 November 5, 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 12/9

2:15 pm-8:00 pm

1 stop5h 45m

Lambert-St Louis

Wed 12/10

8:25 am-12:15 pm

1 stop3h 50m

$121

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 2/12

1:00 pm-2:29 pm

Nonstop1h 29m

Lambert-St Louis

Sat 2/14

8:21 am-9:54 am

Nonstop1h 33m

$127

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Mon 11/17

6:00 am-9:07 am

1 stop27h 07m

Lambert-St Louis

Thu 11/20

3:14 pm-12:08 am

1 stop8h 54m

$129

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Sat 12/6

2:26 pm-10:33 pm

1 stop8h 07m

Lambert-St Louis

Mon 12/8

12:07 pm-8:17 pm

1 stop8h 10m

$130

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 12/9

11:12 am-12:44 pm

Nonstop1h 32m

Lambert-St Louis

Tue 12/9

5:40 pm-7:20 pm

Nonstop1h 40m

$156

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Wed 12/31

1:35 pm-8:41 pm

1 stop7h 06m

Lambert-St Louis

Tue 1/13

6:35 am-1:07 pm

1 stop6h 32m

$157

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Sun 3/1

8:05 am-9:33 am

Nonstop1h 28m

Lambert-St Louis

Tue 3/3

9:58 am-11:25 am

Nonstop1h 27m

$161

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Wed 12/31

1:35 pm-8:41 pm

1 stop7h 06m

Lambert-St Louis

Tue 1/13

6:10 am-1:07 pm

2 stops6h 57m

$162

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 12/2

6:48 am-10:33 pm

1 stop15h 45m

Lambert-St Louis

Tue 12/9

3:30 pm-6:46 pm

2 stops27h 16m

$195

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 11/25

6:00 am-2:29 pm

1 stop8h 29m

Lambert-St Louis

Tue 12/2

3:30 pm-4:03 pm

1 stop24h 33m

$206

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 typical price of a round-trip flight between Chicago O'Hare Intl Airport and St. Louis?

What is the cheapest month to fly to St. Louis?

In general, September 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 $205. The month of March is another great option to travel to St. Louis, with average flight prices from Chicago O'Hare Intl Airport averaging around $244.

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 at noon is the least expensive time of day to depart. momondo users have found prices as low as $314 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 $432 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 $275 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 November 2025, prices for Chicago O'Hare Intl Airport to St. Louis flights are approximately 62% 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

$158

Fastest flight time

1h 14m

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 $158. The best round-trip flight deal from Chicago O'Hare Intl Airport to St. Louis found on momondo in the last 72 hours is $227.
The fastest flight from Chicago O'Hare Intl Airport to St. Louis takes 1h 14m
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 22m.

  • 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 $115Free CancellationRating
7.2
11,040 reviews
Search American Airlines flights
Southern / MokulelePriceFrom $145Free CancellationRating
0.0
0 reviews
Search Southern / Mokulele flights
United AirlinesPriceFrom $152Free CancellationRating
7.4
9,000 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 51 flights on this route every week with an average price of $306. 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 11,041 reviews) operates around 31 flights from Chicago O'Hare Intl Airport to St. Louis in any given week. The average American Airlines airfare for this route is around $299, with deals from around $115 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
Wentzville
Fenton
Collinsville
St. Peters
Alton
Farmington
Festus
Glencoe
Edwardsville
Clayton
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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