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$59+ 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 6/17. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — STL
Jun 15 — Jun 221
Mon 6/15
Mon 6/22
1 adult, Economy
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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 Thursday 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 May 16, 2026.

This Frontier deal was found by Cheapflights users on 5/15. 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.
Thu 6/186:55 am
ORD
-
STL
1 stop10h 35m
Frontier
Thu 6/252:56 pm
STL
-
ORD
1 stop14h 11m
Frontier
Deal found 5/15$249
This Frontier deal was found by Cheapflights users on 5/15. 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.
Tue 6/25:11 pm
ORD
-
STL
1 stop6h 46m
Frontier
Wed 6/34:19 pm
STL
-
ORD
1 stop6h 54m
Frontier
Deal found 5/15$250
This Frontier deal was found by Cheapflights users on 5/12. 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.
Thu 5/289:37 pm
ORD
-
STL
1 stop21h 46m
Frontier
Mon 6/111:24 am
STL
-
ORD
1 stop11h 49m
Frontier
Deal found 5/12$251
This Kiwi.com deal was found by Cheapflights users on 5/13. 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.
Wed 6/101:29 pm
ORD
-
STL
1 stop28h 01m
Frontier
Wed 6/175:06 pm
STL
-
ORD
1 stop14h 57m
Frontier
Deal found 5/13$252
This Kiwi.com deal was found by Cheapflights users on 5/13. 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.
Fri 6/59:37 pm
ORD
-
STL
2 stops16h 18m
Frontier
Mon 6/85:27 pm
STL
-
ORD
1 stop14h 36m
Frontier
Deal found 5/13$253
This Expedia deal was found by Cheapflights users on 5/15. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/309:10 am
ORD
-
STL
1 stop9h 08m
Frontier
Tue 7/78:08 pm
STL
-
ORD
1 stop24h 44m
Frontier
Deal found 5/15$254
This Frontier deal was found by Cheapflights users on 5/13. 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 6/129:10 am
ORD
-
STL
1 stop9h 08m
Frontier
Tue 6/167:46 pm
STL
-
ORD
1 stop9h 21m
Frontier
Deal found 5/13$255
This Kiwi.com deal was found by Cheapflights users on 5/15. 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.
Fri 6/261:29 pm
ORD
-
STL
1 stop19h 23m
Frontier
Sun 6/286:31 pm
STL
-
ORD
1 stop25h 19m
Frontier
Deal found 5/15$256
This Delta deal was found by Cheapflights users on 5/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/178:52 am
ORD
-
STL
1 stop4h 17m
Delta
Mon 6/2210:20 am
STL
-
ORD
1 stop6h 06m
Delta
Deal found 5/15$257
This American Airlines deal was found by Cheapflights users on 5/16. 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.
Fri 6/125:34 pm
ORD
-
STL
1 stop6h 10m
American Airlines
Tue 6/169:09 am
STL
-
ORD
Nonstop1h 26m
American Airlines
Deal found 5/16$258
This Frontier deal was found by Cheapflights users on 5/13. 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.
Tue 5/265:11 pm
ORD
-
STL
1 stop6h 46m
Frontier
Fri 5/294:19 pm
STL
-
ORD
1 stop6h 54m
Frontier
Deal found 5/13$260

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 May 16, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$249
(Frontier)

One-way from

$59
(United Airlines)

Popular in

April

Cheapest in

December

Average price

$390

Good round-trip deal

$415 or less

Good one-way deal

$177 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. 29% potential increase in price ($150 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($21 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 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 May 16, 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

Mon 7/20

1:24 pm-5:19 pm

1 stop3h 55m

Lambert-St Louis

Wed 7/22

6:30 am-10:37 am

1 stop4h 07m

$257

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Sat 6/13

2:35 pm-8:39 pm

1 stop6h 04m

Lambert-St Louis

Tue 6/16

1:59 pm-6:29 pm

1 stop4h 30m

$257

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Fri 6/12

2:07 pm-8:39 pm

1 stop6h 32m

Lambert-St Louis

Tue 6/16

6:30 am-10:50 am

1 stop4h 20m

$268

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 6/4

2:20 pm-3:46 pm

Nonstop1h 26m

Lambert-St Louis

Sun 6/7

8:10 am-9:45 am

Nonstop1h 35m

$275

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 6/2

7:59 pm-9:30 pm

Nonstop1h 31m

Lambert-St Louis

Tue 6/9

5:29 pm-7:00 pm

Nonstop1h 31m

$313
Quickest round-trip

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 6/18

2:20 pm-3:46 pm

Nonstop1h 26m

Lambert-St Louis

Sat 6/27

6:00 am-7:30 am

Nonstop1h 30m

$337

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Sat 6/20

2:20 pm-3:46 pm

Nonstop1h 26m

Lambert-St Louis

Sun 6/21

1:13 pm-2:43 pm

Nonstop1h 30m

$337

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Wed 8/5

5:28 am-9:54 am

1 stop4h 26m

Lambert-St Louis

Wed 8/5

2:10 pm-8:22 pm

1 stop6h 12m

$338

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Wed 7/8

7:05 am-1:05 pm

1 stop6h 00m

Lambert-St Louis

Wed 7/8

5:36 pm-9:52 pm

1 stop4h 16m

$338

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Wed 6/10

2:07 pm-11:23 pm

2 stops9h 16m

Lambert-St Louis

Wed 6/17

6:30 am-1:04 pm

1 stop6h 34m

$343

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/11

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 May.
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 77 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 April is currently the most expensive (average of $589). 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 May 16, 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 39% 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 May 9, 2026.

Travelers seeking maximum savings on their Chicago O'Hare Intl Airport to St. Louis flight should consider departing on Thursday at noon 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?

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 May 16, 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
9,729 reviews

Boarding

7.7

Entertainment

7.1

Overall

7.4

Food

6.6

Comfort

7.3

Crew

8.1

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.
United Airlines
7.4
Good
9,729 reviews
United Airlines
7.4
Good
9,729 reviews

Boarding

7.7

Entertainment

7.1

Overall

7.4

Food

6.6

Comfort

7.3

Crew

8.1

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.
American Airlines
7.1
Good
11,662 reviews
United Airlines
7.4
Good
9,729 reviews

Boarding

7.7

Entertainment

7.1

Overall

7.4

Food

6.6

Comfort

7.3

Crew

8.1

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.
Southern / Mokulele
6.5
Okay
27 reviews
United Airlines
7.4
Good
9,729 reviews

Boarding

7.7

Entertainment

7.1

Overall

7.4

Food

6.6

Comfort

7.3

Crew

8.1

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.

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 59 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?

    Delta and United Airlines can get you from Chicago O'Hare Intl Airport to St. Louis in just under 1h 26m. Your travel time can differ by up to 2h 29m. 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 $124. Additional round-trip tickets that might be worth considering are offered by United Airlines and Southern / Mokulele, with the lowest prices starting at $155 and $165, respectively. American Airlines is 66% 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 $48 and $92, 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: Avianca (83%), British Airways (78%), Aer Lingus( 78%).

  • 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 $418, our data shows the cheapest flight currently is $102. 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 April is currently the most expensive (average of $589). 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
Maryland Heights
Collinsville
Eureka
Wentzville
Glencoe
Chesterfield
Alton
Farmington
Festus

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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 May 16, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$124Average$342FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$155Average$487FlexibilityNo cancel feeOn-time69%
Southern / MokuleleCheapest$165Average$238FlexibilityNo cancel feeOn-timeN/A

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