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O'Hare Intl

$59+ 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 5/13. Fares are subject to change and may not be available on all flights or dates of travel.
STL — ORD
maj 22 — maj 291
fre. 5/22
fre. 5/29
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 Lambert-St Louis to Chicago O'Hare Intl are usually found in September or August, booked 75 days in advance, depart on a Thursday or Friday 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 april 22, 2026.

This Kiwi.com deal was found by Cheapflights users on 4/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
man. 6/85:27 pm
STL
-
ORD
1 stop14h 36m
Frontier
tir. 6/91:50 pm
ORD
-
STL
1 stop18h 57m
Frontier
Deal found 4/17$174
This Expedia deal was found by Cheapflights users on 4/21. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
fre. 5/298:08 pm
STL
-
ORD
1 stop24h 24m
Frontier
søn. 5/316:55 am
ORD
-
STL
1 stop10h 38m
Frontier
Deal found 4/21$180
This Frontier deal was found by Cheapflights users on 4/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
fre. 5/154:19 pm
STL
-
ORD
1 stop6h 54m
Frontier
man. 5/185:30 pm
ORD
-
STL
1 stop6h 51m
Frontier
Deal found 4/20$181
This Frontier deal was found by Cheapflights users on 4/18. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lør. 5/94:19 pm
STL
-
ORD
1 stop6h 54m
Frontier
søn. 5/106:50 am
ORD
-
STL
1 stop10h 04m
Frontier
Deal found 4/18$182
This Frontier deal was found by Cheapflights users on 4/21. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
tor. 5/144:19 pm
STL
-
ORD
1 stop6h 54m
Frontier
man. 5/185:30 pm
ORD
-
STL
1 stop6h 51m
Frontier
Deal found 4/21$183
This Delta deal was found by Cheapflights users on 4/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
man. 6/83:57 pm
STL
-
ORD
1 stop6h 16m
Delta
tir. 6/97:01 am
ORD
-
STL
1 stop6h 08m
Delta
Deal found 4/17$184
This Frontier deal was found by Cheapflights users on 4/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lør. 5/234:19 pm
STL
-
ORD
1 stop6h 54m
Frontier
søn. 5/316:55 am
ORD
-
STL
1 stop10h 38m
Frontier
Deal found 4/20$185
This Expedia deal was found by Cheapflights users on 4/20. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
fre. 5/84:19 pm
STL
-
ORD
1 stop6h 54m
Frontier
søn. 5/106:50 am
ORD
-
STL
1 stop10h 04m
Frontier
Deal found 4/20$190
This American Airlines deal was found by Cheapflights users on 4/17. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lør. 5/95:21 pm
STL
-
ORD
Nonstop1h 34m
American Airlines
man. 5/118:55 pm
ORD
-
STL
Nonstop1h 24m
American Airlines
Deal found 4/17$191
This Priceline deal was found by Cheapflights users on 4/18. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
fre. 5/17:01 pm
STL
-
ORD
1 stop5h 51m
Frontier
tir. 5/57:15 am
ORD
-
STL
1 stop10h 21m
Frontier
Deal found 4/18$201

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 april 22, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$174
(Kiwi.com)

One-way from

$59
(Southwest)

Popular in

April

Cheapest in

September

Average price

$403

Good round-trip deal

$421 or less

Good one-way deal

$248 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.
Search Deals
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. 10% potential increase in price ($36 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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 april 22, 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

ons. 5/20

6:57 pm-11:59 pm

1 stop5h 02m

Chicago O'Hare Intl

ons. 5/27

11:09 am-5:16 pm

1 stop6h 07m

$233

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

fre. 5/29

6:00 am-7:30 am

Nonstop1h 30m

Chicago O'Hare Intl

søn. 5/31

2:20 pm-3:46 pm

Nonstop1h 26m

$337

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

lør. 5/23

11:25 am-8:14 pm

2 stops8h 49m

Chicago O'Hare Intl

søn. 5/31

6:24 am-10:32 am

1 stop4h 08m

$353

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

lør. 5/16

6:10 am-2:20 pm

2 stops8h 10m

Chicago O'Hare Intl

søn. 5/17

2:40 pm-11:45 pm

1 stop9h 05m

$359

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

lør. 5/9

11:25 am-4:51 pm

1 stop5h 26m

Chicago O'Hare Intl

man. 5/11

5:19 pm-9:09 pm

1 stop3h 50m

$369

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

lør. 5/9

7:45 am-9:12 am

Nonstop1h 27m

Chicago O'Hare Intl

man. 5/11

7:45 pm-9:13 pm

Nonstop1h 28m

$399

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

lør. 6/13

5:41 pm-7:12 pm

Nonstop1h 31m

Chicago O'Hare Intl

lør. 6/20

2:20 pm-3:46 pm

Nonstop1h 26m

$407

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

man. 5/18

8:25 am-3:00 pm

1 stop6h 35m

Chicago O'Hare Intl

man. 5/18

7:35 pm-8:30 am

1 stop12h 55m

$409
Quickest round-trip

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

tor. 5/7

7:45 am-9:12 am

Nonstop1h 27m

Chicago O'Hare Intl

tor. 5/7

11:25 am-12:47 pm

Nonstop1h 22m

$434

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

tor. 5/7

8:21 am-9:50 am

Nonstop1h 29m

Chicago O'Hare Intl

søn. 5/10

7:45 pm-9:13 pm

Nonstop1h 28m

$434

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/17

Showing 1-10 of 22 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 April.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapTicketsDealPrice Accuracy3 starsTrust 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?

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to O'Hare Intl. Price data was last updated on April 17, 2026.

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 75 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, September is the cheapest month in which you can book a flight from St. Louis to Chicago O'Hare Intl Airport (average of $211). Flying from St. Louis to Chicago O'Hare Intl Airport in April is currently the most expensive (average of $403). 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 april 22, 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 46% 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 April 18, 2026.

Travelers seeking maximum savings on their St. Louis to Chicago O'Hare Intl Airport flight should consider departing on Friday 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 april 22, 2026.
See what other customers who have flown with United Airlines,American Airlines, andSouthern / Mokulele 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
9,614 reviews

Comfort

7.3

Boarding

7.7

Crew

8.1

Entertainment

7.1

Food

6.6

Overall

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.
United Airlines
7.4
Good
9,614 reviews
United Airlines
7.4
Good
9,614 reviews

Comfort

7.3

Boarding

7.7

Crew

8.1

Entertainment

7.1

Food

6.6

Overall

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.
American Airlines
7.1
Good
11,645 reviews
United Airlines
7.4
Good
9,614 reviews

Comfort

7.3

Boarding

7.7

Crew

8.1

Entertainment

7.1

Food

6.6

Overall

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.
Southern / Mokulele
6.5
Okay
27 reviews
United Airlines
7.4
Good
9,614 reviews

Comfort

7.3

Boarding

7.7

Crew

8.1

Entertainment

7.1

Food

6.6

Overall

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.

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 66 flights from Lambert-St Louis to Chicago O'Hare Intl per day from 3 different airlines.

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

    Delta, United Airlines, and Southwest can get you from St. Louis to Chicago O'Hare Intl Airport in just under 1h 30m. Your travel time can differ by up to 6h 40m. 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. Additional round-trip tickets that might be worth considering are offered by United Airlines and Southern / Mokulele, with the lowest prices starting at $117 and $140, respectively. American Airlines is 68% 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: Republic Airways (85%), Copa Airlines (77%), Japan Airlines( 76%).

  • 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 $158. On average you can expect to pay $939. The most popular route, (Lambert-St Louis - Chicago O'Hare Intl), can usually be booked for $213.

  • 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, September is the cheapest month in which you can book a flight from St. Louis to Chicago O'Hare Intl Airport (average of $211). Flying from St. Louis to Chicago O'Hare Intl Airport in April is currently the most expensive (average of $403). 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
Rosemont
Schaumburg
Naperville
Gurnee
Lake Geneva
Delavan
Hoffman Estates
Downers Grove
Oakbrook Terrace
Benton Harbor
Des Plaines
Oak Brook
South Holland
Libertyville
Elgin
Warrenville
Elk Grove Village
Bridgeview
Great Lakes
Lansing

Browse thousands of different options on Cheapflights for your next trip

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

Discover the top 3 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 april 22, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$97Average$297FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$117Average$349FlexibilityNo cancel feeOn-time69%
Southern / MokuleleCheapest$140Average$212FlexibilityNo cancel feeOn-timeN/A

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