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$46+ 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 5/2. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — STL
Mar 5 — Mar 121
Thu 3/5
Thu 3/12
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 Wednesday or Friday and return on a Thursday

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 February 3, 2026.

This United Airlines deal was found by Cheapflights users on 1/31. 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.
Sat 3/287:40 pm
ORD
-
STL
Nonstop1h 25m
United Airlines
Sat 5/26:49 pm
STL
-
ORD
Nonstop1h 31m
United Airlines
Deal found 1/31$91
This United Airlines deal was found by Cheapflights users on 2/3. 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.
Tue 4/147:40 pm
ORD
-
STL
Nonstop1h 28m
United Airlines
Tue 4/219:10 am
STL
-
ORD
Nonstop1h 29m
United Airlines
Deal found 2/3$117
This United Airlines deal was found by Cheapflights users on 1/31. 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.
Sat 3/287:40 pm
ORD
-
STL
Nonstop1h 25m
United Airlines
Wed 5/69:00 am
STL
-
ORD
Nonstop1h 24m
United Airlines
Deal found 1/31$131
This Southwest deal was found by Cheapflights users on 2/1. 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 4/142:40 pm
ORD
-
STL
1 stop4h 40m
Southwest
Tue 4/215:45 am
STL
-
ORD
1 stop5h 25m
Southwest
Deal found 2/1$137
This Kiwi.com deal was found by Cheapflights users on 2/1. 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 2/258:30 am
ORD
-
STL
1 stop13h 57m
Frontier
Fri 2/278:22 pm
STL
-
ORD
1 stop14h 29m
Frontier
Deal found 2/1$138
This Kiwi.com deal was found by Cheapflights users on 1/31. 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.
Mon 3/23:50 pm
ORD
-
STL
1 stop30h 37m
Frontier
Mon 3/92:09 pm
STL
-
ORD
1 stop18h 14m
Frontier
Deal found 1/31$144
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 2/204:42 pm
ORD
-
STL
1 stop14h 09m
Frontier
Mon 2/238:22 pm
STL
-
ORD
1 stop20h 30m
Frontier
Deal found 2/2$146
This Kiwi.com deal was found by Cheapflights users on 2/2. 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.
Thu 2/194:42 pm
ORD
-
STL
1 stop14h 09m
Frontier
Fri 2/208:20 pm
STL
-
ORD
1 stop14h 26m
Frontier
Deal found 2/2$151
This Kiwi.com deal was found by Cheapflights users on 2/1. 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.
Mon 3/26:51 pm
ORD
-
STL
2 stops36h 00m
Multiple Airlines
Mon 3/92:09 pm
STL
-
ORD
1 stop18h 14m
Multiple Airlines
Deal found 2/1$156
This Delta deal was found by Cheapflights users on 2/3. 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.
Tue 4/148:52 am
ORD
-
STL
1 stop4h 13m
Delta
Tue 4/2111:43 am
STL
-
ORD
1 stop4h 59m
Delta
Deal found 2/3$157
This United Airlines deal was found by Cheapflights users on 1/31. 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.
Sat 3/288:12 pm
ORD
-
STL
Nonstop1h 30m
United Airlines
Mon 5/47:45 am
STL
-
ORD
Nonstop1h 27m
United Airlines
Deal found 1/31$161

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 February 3, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$91
(United Airlines)

One-way from

$46
(United Airlines)

Popular in

January

Cheapest in

December

Average price

$345

Good round-trip deal

$396 or less

Good one-way deal

$218 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. 16% potential increase in price ($58 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($20 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 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 February 3, 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

O'Hare Intl

Fly to

St. Louis

Route

Depart

Return

Price

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 4/14

7:40 pm-9:08 pm

Nonstop1h 28m

Lambert-St Louis

Tue 4/21

9:10 am-10:39 am

Nonstop1h 29m

$117

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Fri 2/20

4:42 pm-6:51 am

1 stop14h 09m

Lambert-St Louis

Mon 2/23

8:22 pm-4:52 pm

1 stop20h 30m

$146

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 4/14

8:52 am-1:05 pm

1 stop4h 13m

Lambert-St Louis

Tue 4/21

11:43 am-4:42 pm

1 stop4h 59m

$157

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Wed 4/1

8:15 pm-9:47 pm

Nonstop1h 32m

Lambert-St Louis

Tue 5/5

7:45 am-9:12 am

Nonstop1h 27m

$171

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Mon 3/30

7:40 pm-9:08 pm

Nonstop1h 28m

Lambert-St Louis

Sat 5/2

6:49 pm-8:20 pm

Nonstop1h 31m

$183

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 3/26

8:20 pm-9:50 pm

Nonstop1h 30m

Lambert-St Louis

Sat 5/2

6:49 pm-8:20 pm

Nonstop1h 31m

$183

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 4/14

11:15 am-5:03 pm

1 stop5h 48m

Lambert-St Louis

Tue 4/21

12:25 pm-1:49 pm

Nonstop1h 24m

$184

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Wed 4/1

7:00 pm-11:25 pm

1 stop4h 25m

Lambert-St Louis

Sat 4/4

12:28 pm-5:53 pm

1 stop5h 25m

$191

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Wed 4/1

7:20 am-5:07 pm

1 stop9h 47m

Lambert-St Louis

Wed 5/6

9:59 am-4:42 pm

1 stop6h 43m

$191

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Fri 2/20

4:42 pm-6:51 am

1 stop14h 09m

Lambert-St Louis

Mon 2/23

3:49 pm-11:22 am

2 stops19h 33m

$197

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/2

Showing 1-10 of 22 results
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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 February.
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?

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 January 30, 2026.

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, September is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to St. Louis (average of $78). Flying from Chicago O'Hare Intl Airport to St. Louis in July is currently the most expensive (average of $172). 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 February 3, 2026.

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 34% 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 January 31, 2026.

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

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 February 3, 2026.
Peruse reviews from past customers who have flown with United Airlines, American Airlines, and Southern / 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
9,231 reviews

Crew

8.1

Overall

7.4

Food

6.6

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
United Airlines
7.4
Good
9,231 reviews
United Airlines
7.4
Good
9,231 reviews

Crew

8.1

Overall

7.4

Food

6.6

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
American Airlines
7.2
Good
11,212 reviews
United Airlines
7.4
Good
9,231 reviews

Crew

8.1

Overall

7.4

Food

6.6

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
Southern / Mokulele
6.5
Okay
27 reviews
United Airlines
7.4
Good
9,231 reviews

Crew

8.1

Overall

7.4

Food

6.6

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

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 47 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, Frontier, and Delta can get you from Chicago O'Hare Intl Airport to St. Louis in just under 1h 28m. Your travel time can differ by up to 12h 41m. 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 $121. Additional round-trip tickets that might be worth considering are offered by United Airlines and Southern / Mokulele, with the lowest prices starting at $144 and $156, respectively. American Airlines is 59% 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 $68 and $78, 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: Turkish Airlines (80%), Republic Airways (72%), Qatar Airways( 71%).

  • 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 $454, our data shows the cheapest flight currently is $149. When looking at the most popular route, (Chicago O'Hare Intl - Lambert-St Louis), you can expect to pay $131 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, September is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to St. Louis (average of $78). Flying from Chicago O'Hare Intl Airport to St. Louis in July is currently the most expensive (average of $172). 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
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
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 February 3, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$121Average$312FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$144Average$334FlexibilityNo cancel feeOn-time69%
Southern / MokuleleCheapest$156Average$215FlexibilityNo cancel feeOn-timeN/A

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