HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
St. Louis

$49+ 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 10/21. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — STL
Oct 19 — Oct 261
Sun 10/19
Sun 10/26
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from O'Hare Intl to St. Louis with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Chicago O'Hare Intl to Lambert-St Louis are usually found in March or August, booked 80 days in advance, depart on a Friday or Wednesday and return on a Thursday

Cheap 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 September 19, 2025.

Round-trip from

$97
(American Airlines)

One-way from

$49
(United Airlines)

Popular in

September

Cheapest in

March

Average price

$336

Good round-trip deal

$207 or less

Good one-way deal

$110 or less
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
High demand for flights, 0% potential price rise
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
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

Find 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 September 19, 2025.

This American Airlines deal was found by Cheapflights users on 9/16. 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.
Tue 10/2112:21 pmORD - STL
Nonstop1h 23mAmerican Airlines
Mon 10/277:16 amSTL - ORD
Nonstop1h 27mAmerican Airlines
Deal found 9/16$97
This American Airlines deal was found by Cheapflights users on 9/16. 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.
Thu 10/96:53 pmORD - STL
Nonstop1h 33mAmerican Airlines
Mon 10/136:00 amSTL - ORD
Nonstop1h 23mAmerican Airlines
Deal found 9/16$98
This Southwest deal was found by Cheapflights users on 9/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/73:10 pmORD - STL
1 stop6h 55mSouthwest
Wed 10/222:55 pmSTL - ORD
1 stop6h 35mSouthwest
Deal found 9/16$117
This Southwest deal was found by Cheapflights users on 9/17. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/161:45 pmORD - STL
1 stop8h 25mSouthwest
Sat 1/107:00 amSTL - ORD
1 stop6h 00mSouthwest
Deal found 9/17$122
This United Airlines deal was found by Cheapflights users on 9/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/222:20 pmORD - STL
Nonstop1h 24mUnited Airlines
Fri 10/245:28 pmSTL - ORD
Nonstop1h 25mUnited Airlines
Deal found 9/17$134
This Frontier deal was found by Cheapflights users on 9/16. 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.
Fri 10/315:25 amORD - STL
1 stop7h 52mFrontier
Fri 10/314:52 pmSTL - ORD
1 stop6h 47mFrontier
Deal found 9/16$139
This Kiwi.com deal was found by Cheapflights users on 9/18. 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.
Tue 10/217:15 amORD - STL
1 stop25h 52mFrontier
Sat 10/257:52 pmSTL - ORD
1 stop13h 44mFrontier
Deal found 9/18$140
This Priceline deal was found by Cheapflights users on 9/16. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/65:01 amORD - STL
1 stop5h 11mFrontier
Fri 11/74:56 pmSTL - ORD
1 stop7h 15mFrontier
Deal found 9/16$143
This Priceline deal was found by Cheapflights users on 9/16. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/255:10 amORD - STL
1 stop9h 54mFrontier
Mon 9/294:00 pmSTL - ORD
1 stop8h 10mFrontier
Deal found 9/16$144
This Tripair deal was found by Cheapflights users on 9/18. 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 Tripair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/92:20 pmORD - STL
Nonstop1h 24mUnited Airlines
Mon 10/139:20 amSTL - ORD
Nonstop1h 30mUnited Airlines
Deal found 9/18$146
This United Airlines deal was found by Cheapflights users on 9/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/202:20 pmORD - STL
Nonstop1h 24mUnited Airlines
Wed 10/226:30 amSTL - ORD
Nonstop1h 30mUnited Airlines
Deal found 9/16$149

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 September 19, 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

O'Hare Intl

Fly to

St. Louis

Route

Depart

Return

Price

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Sat 10/11

6:15 pm-7:42 pm

Nonstop1h 27m

Lambert-St Louis

Mon 10/13

9:20 am-10:50 am

Nonstop1h 30m

$97

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

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

Tue 10/21

7:15 am-9:07 am

1 stop25h 52m

Lambert-St Louis

Sat 10/25

7:52 pm-9:36 am

1 stop13h 44m

$140

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

$149

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 10/21

6:53 pm-8:26 pm

Nonstop1h 33m

Lambert-St Louis

Sat 10/25

5:20 am-10:55 am

1 stop5h 35m

$174

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 10/21

10:30 am-5:29 pm

1 stop6h 59m

Lambert-St Louis

Mon 10/27

2:15 pm-6:14 pm

1 stop3h 59m

$177

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Mon 11/17

4:21 pm-11:40 pm

1 stop7h 19m

Lambert-St Louis

Wed 11/19

6:00 am-11:39 am

1 stop5h 39m

$177

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 10/14

7:10 am-1:22 pm

1 stop6h 12m

Lambert-St Louis

Tue 10/21

6:00 am-10:20 am

1 stop4h 20m

$177

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 10/9

1:10 pm-4:35 pm

1 stop3h 25m

Lambert-St Louis

Fri 10/10

6:05 pm-3:39 pm

1 stop21h 34m

$178

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 22 results
1
2
3

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

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Chicago O'Hare Intl Airport to St. Louis trip
Airports
ORD

For a quick departure, use the "L" train to avoid traffic and reach ORD efficiently from downtown Chicago.

Read more about ORDby Ramsey Qubein
STL

Use the MetroLink light rail for a convenient and economical ride from STL to downtown St. Louis in about 40 minutes.

Read more about STLby Taryn White
Our travel experts
Ramsey Qubein

Ramsey Qubein

Expert on ORD

Ramsey Qubein

Ramsey Qubein

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

Taryn White

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

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?

Use this chart to determine the optimal time to book a round-trip flight from O'Hare Intl to St. Louis. Price data was last updated on September 12, 2025.

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 78 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, August is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to St. Louis (average of $311). Flying from Chicago O'Hare Intl Airport to St. Louis in March is currently the most expensive (average of $356). 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 September 19, 2025.

It’s typically best to fly out from Chicago O'Hare Intl Airport to St. Louis in the evening. Doing so could potentially save you 17% on the flight price compared to flying in the morning, 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 September 14, 2025.

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

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 September 19, 2025.
Peruse reviews from past customers who have flown with United Airlines and American Airlines 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
8,926 reviews

Comfort

7.3

Crew

8.1

Overall

7.4

Food

6.6

Boarding

7.7

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Julia,Sep 2025

BUF - DEN

The staff were amazing, from check in to boarding and on the flight. The range of entertainment options were really good as well.
United Airlines
7.4
Good
8,926 reviews
United Airlines
7.4
Good
8,926 reviews

Comfort

7.3

Crew

8.1

Overall

7.4

Food

6.6

Boarding

7.7

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Julia,Sep 2025

BUF - DEN

The staff were amazing, from check in to boarding and on the flight. The range of entertainment options were really good as well.
American Airlines
7.2
Good
10,000 reviews
United Airlines
7.4
Good
8,926 reviews

Comfort

7.3

Crew

8.1

Overall

7.4

Food

6.6

Boarding

7.7

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Julia,Sep 2025

BUF - DEN

The staff were amazing, from check in to boarding and on the flight. The range of entertainment options were really good as well.

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 55 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, Southwest, and Frontier can get you from Chicago O'Hare Intl Airport to St. Louis in just under 1h 27m. Your travel time can differ by up to 24h 25m. 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 $116. Additional round-trip tickets that might be worth considering are offered by Southern / Mokulele and United Airlines, with the lowest prices starting at $118 and $152, respectively. American Airlines is 59% cheaper than the average price of flights available within the next 90 days to this destination.

  • 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: SkyWest Airlines (81%), ANA (76%), Envoy Air( 73%).

  • 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 $279, our data shows the cheapest flight currently is $48. When looking at the most popular route, (Chicago O'Hare Intl - Lambert-St Louis), you can expect to pay $97 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, August is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to St. Louis (average of $311). Flying from Chicago O'Hare Intl Airport to St. Louis in March is currently the most expensive (average of $356). 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
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
St. Peters
Chesterfield
Alton
Farmington
Festus

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 September 19, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$116Average$288FlexibilityNo cancel feeOn-time71%
Southern / MokuleleCheapest$118Average$221FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$152Average$320FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.