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O'Hare Intl

$49+ Cheap flights from St. Louis (STL) to O'Hare Intl (ORD)

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 8/13. Fares are subject to change and may not be available on all flights or dates of travel.
STL — ORD
Aug 22 — Aug 291
Sat 8/22
Sat 8/29
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to Chicago O'Hare Intl are usually found in December or October, booked 51 days in advance, depart on a Friday or Thursday and return on a Saturday

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

Cheapest flights from St. Louis to O'Hare Intl
Explore the most affordable flight options available from St. Louis to O'Hare Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 23, 2026.

This Delta deal was found by Cheapflights users on 7/22. 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.
Thu 8/136:30 am
STL
-
ORD
1 stop6h 38m
Delta
Mon 8/171:41 pm
ORD
-
STL
1 stop7h 01m
Delta
Deal found 7/22$157
This United Airlines deal was found by Cheapflights users on 7/22. 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 10/51:29 pm
STL
-
ORD
Nonstop1h 31m
United Airlines
Wed 10/710:40 am
ORD
-
STL
Nonstop1h 33m
United Airlines
Deal found 7/22$165
This Delta deal was found by Cheapflights users on 7/22. 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.
Thu 12/106:45 am
STL
-
ORD
1 stop5h 52m
Delta
Wed 1/131:35 pm
ORD
-
STL
1 stop7h 02m
Delta
Deal found 7/22$167
This United Airlines deal was found by Cheapflights users on 7/21. 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.
Thu 8/137:25 am
STL
-
ORD
Nonstop1h 36m
United Airlines
Mon 8/178:29 pm
ORD
-
STL
Nonstop1h 31m
United Airlines
Deal found 7/21$168
This United Airlines deal was found by Cheapflights users on 7/21. 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.
Thu 12/37:33 am
STL
-
ORD
Nonstop1h 27m
United Airlines
Thu 12/32:12 pm
ORD
-
STL
Nonstop1h 29m
United Airlines
Deal found 7/21$175
This United Airlines deal was found by Cheapflights users on 7/20. 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 9/58:00 am
STL
-
ORD
Nonstop1h 34m
United Airlines
Sun 9/68:40 am
ORD
-
STL
Nonstop1h 32m
United Airlines
Deal found 7/20$177
This Delta deal was found by Cheapflights users on 7/20. 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.
Mon 11/162:18 pm
STL
-
ORD
1 stop4h 22m
Delta
Mon 11/237:05 am
ORD
-
STL
1 stop6h 15m
Delta
Deal found 7/20$186
This Kiwi.com deal was found by Cheapflights users on 7/22. 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 10/510:35 am
STL
-
ORD
1 stop9h 09m
Frontier
Thu 10/89:33 pm
ORD
-
STL
1 stop12h 07m
Frontier
Deal found 7/22$190
This American Airlines deal was found by Cheapflights users on 7/20. 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.
Mon 8/248:07 pm
STL
-
ORD
Nonstop1h 33m
American Airlines
Thu 8/2711:00 pm
ORD
-
STL
Nonstop1h 14m
American Airlines
Deal found 7/20$194

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

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to O'Hare Intl (ORD). 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 July 23, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$165
(United Airlines)

One-way from

$49
(American Airlines)

Popular in

July

Cheapest in

December

Average price

$428

Good round-trip deal

$507 or less

Good one-way deal

$262 or less
Provider with most accurate pricing for Lambert-St Louis-Chicago O'Hare Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Chicago O'Hare Intl flights.
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From Lambert-St Louis to Chicago O'Hare Intl
Search Deals
One-way flight from Lambert-St Louis to Chicago O'Hare Intl
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($45 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($9 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 Lambert-St Louis to Chicago O'Hare Intl.
Search Deals
Price to beat on a one-way flight from Lambert-St Louis to Chicago O'Hare Intl.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to O'Hare Intl 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 July 23, 2026.
Use the filters below to find and compare flights from St. Louis to Chicago O'Hare Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Wed 8/19

10:33 am-4:17 pm

1 stop5h 44m

Chicago O'Hare Intl

Wed 8/26

11:22 am-5:38 pm

1 stop6h 16m

$167

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Sat 9/5

8:00 am-9:34 am

Nonstop1h 34m

Chicago O'Hare Intl

Sun 9/6

8:40 am-10:12 am

Nonstop1h 32m

$187

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Tue 9/1

7:25 am-9:01 am

Nonstop1h 36m

Chicago O'Hare Intl

Wed 9/30

12:45 pm-2:17 pm

Nonstop1h 32m

$195

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Mon 8/24

2:10 pm-6:29 pm

1 stop4h 19m

Chicago O'Hare Intl

Mon 8/31

1:59 pm-8:42 pm

1 stop6h 43m

$198

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Wed 8/19

2:10 pm-8:30 pm

1 stop6h 20m

Chicago O'Hare Intl

Sat 8/22

2:30 pm-8:42 pm

1 stop6h 12m

$215

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Mon 8/10

2:10 pm-8:30 pm

1 stop6h 20m

Chicago O'Hare Intl

Sat 8/15

2:30 pm-8:42 pm

1 stop6h 12m

$215

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Thu 12/10

6:45 am-12:37 pm

1 stop5h 52m

Chicago O'Hare Intl

Wed 1/13

1:35 pm-8:37 pm

1 stop7h 02m

$215

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Mon 8/17

2:10 pm-6:29 pm

1 stop4h 19m

Chicago O'Hare Intl

Mon 8/24

1:59 pm-8:42 pm

1 stop6h 43m

$215
Quickest round-trip

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Thu 8/20

8:00 am-9:34 am

Nonstop1h 34m

Chicago O'Hare Intl

Sun 8/23

9:30 pm-10:59 pm

Nonstop1h 29m

$217

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Sat 8/15

6:54 pm-8:30 pm

Nonstop1h 36m

Chicago O'Hare Intl

Sun 8/16

7:05 am-8:39 am

Nonstop1h 34m

$228

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/22

Showing 1-10 of 23 resultsSorted by cheapest first
1
2
3

Compare providers for flights from St. Louis to O'Hare Intl

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 St. Louis to O'Hare Intl in July.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
eDreamsPrice Accuracy2 starsTrust Score*3 stars
CheapTicketsDealPrice Accuracy1 starTrust Score*3 stars

*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 St. Louis-Chicago O'Hare Intl Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Chicago O'Hare Intl Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Chicago O'Hare Intl Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-Chicago O'Hare Intl Airport 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 St. Louis-Chicago O'Hare Intl Airport 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 St. Louis to O'Hare Intl

Have a flexible travel schedule? Discover the best time to fly to O'Hare Intl from St. Louis 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 St. Louis to Chicago O'Hare Intl Airport

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

To ensure you get the cheapest price possible for a flight from St. Louis to Chicago O'Hare Intl Airport, you should look to book at least 50 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, December is the cheapest month in which you can book a flight from St. Louis to Chicago O'Hare Intl Airport (average of $258). Flying from St. Louis to Chicago O'Hare Intl Airport in July is currently the most expensive (average of $428). 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 STL to ORD?

Find hourly flight availability from St. Louis to O'Hare Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 23, 2026.

It’s typically best to fly out from St. Louis to Chicago O'Hare Intl Airport in the morning. Doing so could potentially save you 45% on the flight price compared to flying at noon, which is usually more expensive.

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

Use this chart to determine the cheapest time to fly round-trip from St. Louis to O'Hare Intl. Price data was last updated on July 18, 2026.

Travelers seeking maximum savings on their St. Louis to Chicago O'Hare Intl Airport flight should consider departing on Saturday mornings when fares are most often at their lowest. Thursday at noon 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 St. Louis to Chicago O'Hare Intl Airport?

The best insider tips for St. Louis to Chicago O'Hare Intl Airport 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 St. Louis to Chicago O'Hare Intl Airport trip
Our travel experts
Blane Bachelor

Blane Bachelor

Expert on Lufthansa

Blane Bachelor is a journalist and editor specializing in travel and aviation who writes regularly for top global outlets. Born and raised in Florida, Blane has worked and lived in four countries, including the Netherlands, where she’s currently based with her family. Her favorite way to get to know a new destination is by running or riding a bike around town – or hearing a spooky ghost story about local history. She will always choose the window seat.

Read more
Harriet Baskas

Harriet Baskas

Expert on United Airlines

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more
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 O'Hare Intl

Get insights into the airlines that provide service to O'Hare Intl. 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 O'Hare Intl. Reviews last updated July 23, 2026.
See what other customers who have flown with United Airlines and American Airlines from St. Louis to Chicago O'Hare Intl Airport have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
10,024 reviews

Crew

8.1

Overall

7.4

Boarding

7.7

Food

6.6

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!
United Airlines
7.4
Good
10,024 reviews
United Airlines
7.4
Good
10,024 reviews

Crew

8.1

Overall

7.4

Boarding

7.7

Food

6.6

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!
American Airlines
7.1
Good
11,832 reviews
United Airlines
7.4
Good
10,024 reviews

Crew

8.1

Overall

7.4

Boarding

7.7

Food

6.6

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!

Related info for your journey

Find useful and relevant information for your journey from St. Louis to O'Hare Intl. 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 from for flights from St. Louis to Chicago O'Hare Intl?

    If you book a flight to Chicago O'Hare Intl from St. Louis, you will be flying from Lambert-St Louis, which is the city’s only airport. Lambert-St Louis (STL) is located 12.7 mi from the center of St. Louis. There are 60 flights from Lambert-St Louis to Chicago O'Hare Intl per day from 2 different airlines.

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

    Delta and United Airlines can get you from St. Louis to Chicago O'Hare Intl Airport in just under 1h 34m. Your travel time can differ by up to 4h 10m. The distance between St. Louis and Chicago O'Hare Intl Airport is about 258 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    Flying on American Airlines is currently your cheapest option to Chicago O'Hare Intl Airport, with prices starting at $97. Another option worth looking into is United Airlines, starting at $145 round trip. American Airlines is 71% cheaper than the average price of flights available within the next 90 days to this destination.

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

    For one-way options, check prices for American Airlines. According to our data, you can fly for as low as $57. Users have also found prices from $75 and $95 on United Airlines and Southern / Mokulele, respectively.

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

    Before booking your flight to Chicago O'Hare Intl Airport from St. Louis, check out the most reliable airlines to get you to your destination on time: Cathay Pacific (92%), Turkish Airlines (89%), Copa Airlines( 86%).

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

    The cheapest flight price from St. Louis to Chicago O'Hare Intl Airport is $168. On average you can expect to pay $1,664. The most popular route, (Lambert-St Louis - Chicago O'Hare Intl), can usually be booked for $97.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from St. Louis to O'Hare Intl 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 St. Louis to Chicago O'Hare Intl Airport?

    Currently, December is the cheapest month in which you can book a flight from St. Louis to Chicago O'Hare Intl Airport (average of $258). Flying from St. Louis to Chicago O'Hare Intl Airport in July is currently the most expensive (average of $428). 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 Chicago O'Hare Intl Airport?

Book flights to Chicago O'Hare Intl Airport if you plan to visit one of these locations
Benton Harbor
Rosemont
Schaumburg
Lake Geneva
Naperville
Oak Brook
Delavan
Oakbrook Terrace
Gurnee
South Holland
Libertyville
Orland Park
Hoffman Estates
Beloit
Downers Grove
Rockford
Racine
Great Lakes
Janesville
Joliet

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Top 2 airlines flying from St. Louis to O'Hare Intl

Discover the top 2 airlines that operate flights from St. Louis to O'Hare Intl. 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 July 23, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$97Average$317FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$145Average$415FlexibilityNo cancel feeOn-time69%

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