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St. Louis

$92+ Cheap flights from O'Hare Intl (ORD) to St. Louis (STL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/23. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — STL
août 28 — sept. 41
ven. 8/28
ven. 9/4
1 adult, Economy
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1. Tell us where you want to go

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Cheapflights Tip: The best prices from Chicago O'Hare Intl to Lambert-St Louis are usually found in December or September, booked 78 days in advance, depart on a Saturday or Friday and return on a Friday

Cheap flight deals from O'Hare Intl to St. Louis

Cheapest flights from O'Hare Intl to St. Louis
Explore the most affordable flight options available from O'Hare Intl to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on juillet 29, 2026.

This Kiwi.com deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven. 9/112:46 pm
ORD
-
STL
2 stops45h 21m
Frontier
ven. 9/188:10 pm
STL
-
ORD
1 stop28h 13m
Frontier
Deal found 7/28$286
This Kiwi.com deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sam. 8/221:59 pm
ORD
-
STL
1 stop27h 23m
Frontier
sam. 8/296:45 pm
STL
-
ORD
2 stops37h 08m
Frontier
Deal found 7/25$287
This Kiwi.com deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 9/166:20 am
ORD
-
STL
1 stop6h 50m
Frontier
ven. 9/182:29 pm
STL
-
ORD
2 stops23h 48m
Frontier
Deal found 7/25$289
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 9/37:05 am
ORD
-
STL
1 stop10h 17m
Frontier
jeu. 9/2410:20 am
STL
-
ORD
2 stops14h 03m
Frontier
Deal found 7/27$292
This Frontier deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 8/117:29 am
ORD
-
STL
1 stop10h 36m
Frontier
sam. 8/154:09 pm
STL
-
ORD
1 stop7h 01m
Frontier
Deal found 7/27$293
This American Airlines deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sam. 10/179:30 am
ORD
-
STL
Nonstop1h 21m
American Airlines
sam. 10/249:27 am
STL
-
ORD
1 stop6h 38m
American Airlines
Deal found 7/26$294
This American Airlines deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 9/911:50 am
ORD
-
STL
1 stop5h 40m
American Airlines
mer. 9/165:18 pm
STL
-
ORD
Nonstop1h 55m
American Airlines
Deal found 7/26$295
This American Airlines deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/84:53 pm
ORD
-
STL
1 stop6h 02m
American Airlines
mar. 9/155:18 pm
STL
-
ORD
Nonstop1h 55m
American Airlines
Deal found 7/24$296
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 8/261:59 pm
ORD
-
STL
1 stop27h 23m
Frontier
mer. 9/26:45 pm
STL
-
ORD
2 stops37h 08m
Frontier
Deal found 7/27$297
This American Airlines deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven. 9/2511:05 pm
ORD
-
STL
Nonstop1h 22m
American Airlines
dim. 9/2711:01 am
STL
-
ORD
Nonstop1h 28m
American Airlines
Deal found 7/25$298
This Kiwi.com deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/81:59 pm
ORD
-
STL
1 stop19h 41m
Frontier
mar. 9/1512:17 pm
STL
-
ORD
2 stops12h 06m
Frontier
Deal found 7/24$299
This Frontier deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/107:29 am
ORD
-
STL
1 stop10h 46m
Frontier
ven. 8/144:09 pm
STL
-
ORD
1 stop7h 01m
Frontier
Deal found 7/25$300

Find flight deals from O'Hare Intl to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from O'Hare Intl (ORD) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated juillet 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$284
(Kiwi.com)

One-way from

$92
(United Airlines)

Popular in

May

Cheapest in

December

Average price

$407

Good round-trip deal

$415 or less

Good one-way deal

$179 or less
Provider with most accurate pricing for Chicago O'Hare Intl-Lambert-St Louis flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago O'Hare Intl-Lambert-St Louis flights.
Search Deals
From Chicago O'Hare Intl to Lambert-St Louis
Search Deals
One-way flight from Chicago O'Hare Intl to Lambert-St Louis
Search Deals
Highest demand for flights based on searches. 26% potential increase in price ($153 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($20 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
Search Deals
Price to beat on a round-trip flight from Chicago O'Hare Intl to Lambert-St Louis.
Search Deals
Price to beat on a one-way flight from Chicago O'Hare Intl to Lambert-St Louis.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from O'Hare Intl 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, Cheapflights users made 2,558,603 searches. Data last updated juillet 29, 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

Cheapest round-trip

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

dim. 8/30

7:05 am-8:39 am

Nonstop1h 34m

Lambert-St Louis

ven. 10/2

1:29 pm-3:00 pm

Nonstop1h 31m

$298

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

lun. 8/31

2:07 pm-3:38 pm

Nonstop1h 31m

Lambert-St Louis

mar. 9/1

8:40 am-6:57 pm

2 stops10h 17m

$316

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

lun. 8/24

1:59 pm-8:42 pm

1 stop6h 43m

Lambert-St Louis

mar. 8/25

6:20 am-1:08 pm

2 stops6h 48m

$333

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

sam. 9/19

2:00 pm-8:35 pm

1 stop6h 35m

Lambert-St Louis

dim. 9/20

6:15 am-12:59 pm

2 stops6h 44m

$343

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

ven. 9/11

8:55 am-3:14 pm

1 stop6h 19m

Lambert-St Louis

ven. 9/18

6:54 pm-11:59 pm

1 stop5h 05m

$355

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

lun. 9/14

1:55 pm-8:35 pm

1 stop6h 40m

Lambert-St Louis

mar. 9/15

11:21 am-8:30 pm

2 stops9h 09m

$364
Quickest round-trip

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

ven. 8/14

5:45 pm-7:16 pm

Nonstop1h 31m

Lambert-St Louis

sam. 8/15

12:59 pm-2:30 pm

Nonstop1h 31m

$449

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

lun. 8/3

3:07 pm-4:40 pm

Nonstop1h 33m

Lambert-St Louis

lun. 8/3

7:22 pm-12:50 am

1 stop5h 28m

$476

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

jeu. 8/20

1:44 pm-8:42 pm

1 stop6h 58m

Lambert-St Louis

jeu. 8/27

11:13 am-8:30 pm

2 stops9h 17m

$478

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

ven. 8/14

6:00 am-10:23 am

1 stop4h 23m

Lambert-St Louis

sam. 8/15

6:20 am-1:50 pm

2 stops7h 30m

$514

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

Showing 1-10 of 22 resultsSorted by cheapest first
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Compare providers for flights from O'Hare Intl to St. Louis

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from O'Hare Intl to St. Louis in July.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Chicago O'Hare Intl Airport-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Chicago O'Hare Intl Airport-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Chicago O'Hare Intl Airport-St. Louis flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Chicago O'Hare Intl Airport-St. Louis flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Chicago O'Hare Intl Airport-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from O'Hare Intl to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from O'Hare Intl with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Chicago O'Hare Intl Airport to St. Louis

How far ahead should I book a flight from Chicago O'Hare Intl Airport to St. Louis?

The price you pay for your flight from Chicago O'Hare Intl Airport to St. Louis may vary depending on when you book. For the best chance of a lower fare, look to book 75 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Chicago O'Hare Intl Airport to St. Louis?

Currently, December is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to St. Louis (average of $213). Flying from Chicago O'Hare Intl Airport to St. Louis in May is currently the most expensive (average of $631). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ORD to STL?

Find hourly flight availability from O'Hare Intl to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated juillet 29, 2026.

It’s typically best to fly out from Chicago O'Hare Intl Airport to St. Louis at noon. Doing so could potentially save you 35% on the flight price compared to flying in the afternoon, which is usually more expensive.

What is the cheapest day to fly from Chicago O'Hare Intl Airport to St. Louis?

Use this chart to determine the cheapest time to fly round-trip from O'Hare Intl to St. Louis. Price data was last updated on July 25, 2026.

Travelers seeking maximum savings on their Chicago O'Hare Intl Airport to St. Louis flight should consider departing on Saturday afternoons when fares are most often at their lowest. Sunday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

How much does it cost to fly round-trip from Chicago O'Hare Intl Airport to St. Louis?

Airfare is typical for this route at the moment.

Chicago O'Hare Intl Airport to St. Louis flights typically cost between $252 and $421 in October.
The cheapest round-trip price found within the last 5 days was $284 on Frontier (Oct 5-Oct 7).

The best insider tips for Chicago O'Hare Intl Airport to St. Louis flights

AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Chicago O'Hare Intl Airport to St. Louis trip
Our travel experts
Ramsey Qubein

Ramsey Qubein

Expert on ORD

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more
Taryn White

Taryn White

Expert on STL

Taryn White is a freelance travel writer, digital creator, and travel advisor who has visited nearly 100 countries and all 50 states. She’s familiar with many airports and enjoys beach hopping, boutique hotels, spa experiences, and exploring local culture. Her work has appeared in Travel + Leisure, Condé Nast Traveler, National Geographic, Smithsonian Magazine, AFAR, and more.

Read more

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Louis. Reviews last updated juillet 29, 2026.
Peruse reviews from past customers who have flown with United Airlines,American Airlines, andSouthern / Mokulele from Chicago O'Hare Intl Airport to St. Louis to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
10,052 reviews

Crew

8.1

Entertainment

7.1

Overall

7.4

Boarding

7.7

Food

6.6

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Tim,May 2023

ORD - DLH

Didn’t have to wait long for the plane and was in the lounge through that time could relax there made it nice.
United Airlines
7.4
Good
10,052 reviews
United Airlines
7.4
Good
10,052 reviews

Crew

8.1

Entertainment

7.1

Overall

7.4

Boarding

7.7

Food

6.6

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Tim,May 2023

ORD - DLH

Didn’t have to wait long for the plane and was in the lounge through that time could relax there made it nice.
American Airlines
7.1
Good
11,840 reviews
United Airlines
7.4
Good
10,052 reviews

Crew

8.1

Entertainment

7.1

Overall

7.4

Boarding

7.7

Food

6.6

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Tim,May 2023

ORD - DLH

Didn’t have to wait long for the plane and was in the lounge through that time could relax there made it nice.
Southern / Mokulele
6.5
Okay
27 reviews
United Airlines
7.4
Good
10,052 reviews

Crew

8.1

Entertainment

7.1

Overall

7.4

Boarding

7.7

Food

6.6

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Tim,May 2023

ORD - DLH

Didn’t have to wait long for the plane and was in the lounge through that time could relax there made it nice.

Related info for your journey

Find useful and relevant information for your journey from O'Hare Intl to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to St. Louis from Chicago O'Hare Intl?

    Most people fly into Lambert-St Louis (STL) if they book a flight to St. Louis from Chicago O'Hare Intl. On average, Lambert-St Louis has 52 inbound flights from Chicago O'Hare Intl per day from 3 airlines. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.

  • How long is the flight from Chicago O'Hare Intl Airport to St. Louis?

    United Airlines and Delta can get you from Chicago O'Hare Intl Airport to St. Louis in just under 1h 34m. Your travel time can differ by up to 5h 09m. Airlines will cover a distance of 258 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from Chicago O'Hare Intl Airport to St. Louis round-trip?

    Flying on American Airlines is currently your cheapest option to St. Louis, with prices starting at $151. Additional round-trip tickets that might be worth considering are offered by United Airlines and Southern / Mokulele, with the lowest prices starting at $157 and $165, respectively. American Airlines is 63% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest airlines to fly from Chicago O'Hare Intl Airport to St. Louis one-way?

    $48 is the cheapest one-way deal found within the past few days, from American Airlines. You may also be able to find cheap deals on United Airlines and Southern / Mokulele, with prices starting from $58 and $103, respectively.

  • What are the most reliable airlines from Chicago O'Hare Intl Airport to St. Louis?

    Before booking your flight to St. Louis from Chicago O'Hare Intl Airport, check out the most reliable airlines to get you to your destination on time: Japan Airlines (79%), SkyWest Airlines (77%), Avianca( 75%).

  • What are the cheapest flights from Chicago O'Hare Intl Airport to St. Louis?

    While on average a flight from Chicago O'Hare Intl Airport to St. Louis is generally $334, our data shows the cheapest flight currently is $158. When looking at the most popular route, (Chicago O'Hare Intl - Lambert-St Louis), you can expect to pay $117 for that flight.

  • Can I find deals for flights from O'Hare Intl to St. Louis that include hotel bookings?

    Yes. In addition to deals on O'Hare Intl to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from O'Hare Intl to St. Louis?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from O'Hare Intl to St. Louis.

  • Can I find deals for business class flights from O'Hare Intl to St. Louis?

    Yes. Cheapflights offers flight deals from O'Hare Intl to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Chicago O'Hare Intl Airport to St. Louis?

    Currently, December is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to St. Louis (average of $213). Flying from Chicago O'Hare Intl Airport to St. Louis in May is currently the most expensive (average of $631). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Edwardsville
O'Fallon
Fenton
Swansea
Fairview Heights
Eureka
Maryland Heights
Collinsville
Wentzville
Glencoe
Chesterfield
Farmington

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Top 3 airlines flying from O'Hare Intl to St. Louis

Discover the top 3 airlines that operate flights from O'Hare Intl to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated juillet 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$151Average$366FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$157Average$490FlexibilityNo cancel feeOn-time69%
Southern / MokuleleCheapest$165Average$213FlexibilityNo cancel feeOn-timeN/A

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