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O'Hare Intl

$46+ 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 1/10. Fares are subject to change and may not be available on all flights or dates of travel.
STL — ORD
Jan 3 — Jan 101
Sat 1/3
Sat 1/10
1 adult, Economy
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Find cheap flights from St. Louis to O'Hare Intl 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

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3. Compare prices and book

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Cheapflights Tip: The best prices from Lambert-St Louis to Chicago O'Hare Intl are usually found in September or April, booked 75 days in advance, depart on a Thursday or Friday and return on a Friday

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 December 4, 2025.

This Delta deal was found by Cheapflights users on 12/2. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/256:29 amSTL - ORD
1 stop6h 25mDelta
Thu 1/85:30 amORD - STL
1 stop5h 32mDelta
Deal found 12/2$157
This Frontier deal was found by Cheapflights users on 12/2. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/2310:48 amSTL - ORD
1 stop11h 36mFrontier
Sat 1/108:27 pmORD - STL
1 stop12h 13mFrontier
Deal found 12/2$163
This American Airlines deal was found by Cheapflights users on 12/2. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/259:08 amSTL - ORD
Nonstop1h 27mAmerican Airlines
Wed 12/317:14 amORD - STL
Nonstop1h 34mAmerican Airlines
Deal found 12/2$167
This American Airlines deal was found by Cheapflights users on 12/2. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/171:43 pmSTL - ORD
Nonstop1h 30mAmerican Airlines
Sat 1/108:50 amORD - STL
Nonstop1h 30mAmerican Airlines
Deal found 12/2$174
This Kiwi.com deal was found by Cheapflights users on 12/1. 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.
Tue 12/93:30 pmSTL - ORD
2 stops23h 01mMultiple Airlines
Fri 12/122:26 pmORD - STL
1 stop8h 07mMultiple Airlines
Deal found 12/1$189
This Frontier deal was found by Cheapflights users on 12/1. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/2310:48 amSTL - ORD
1 stop11h 36mFrontier
Fri 1/95:50 amORD - STL
1 stop8h 58mFrontier
Deal found 12/1$198
This Frontier deal was found by Cheapflights users on 12/2. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/1112:04 pmSTL - ORD
1 stop10h 20mFrontier
Sun 12/142:36 pmORD - STL
1 stop7h 57mFrontier
Deal found 12/2$208
This Kiwi.com deal was found by Cheapflights users on 12/2. 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 12/127:43 pmSTL - ORD
2 stops26h 41mFrontier
Tue 1/135:57 pmORD - STL
1 stop12h 54mFrontier
Deal found 12/2$210
This Frontier deal was found by Cheapflights users on 12/2. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/1210:42 amSTL - ORD
1 stop11h 42mFrontier
Sun 12/142:36 pmORD - STL
1 stop7h 57mFrontier
Deal found 12/2$212

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 December 4, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$91
(United Airlines)

One-way from

$46
(United Airlines)

Popular in

July

Cheapest in

September

Average price

$283

Good round-trip deal

$485 or less

Good one-way deal

$231 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. 7% potential increase in price ($23 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 December 4, 2025.
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

St. Louis

Fly to

O'Hare Intl

Route

Depart

Return

Price

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Tue 1/27

6:10 am-11:47 am

1 stop5h 37m

Chicago O'Hare Intl

Mon 2/2

6:45 pm-11:25 pm

1 stop4h 40m

$157

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Thu 1/8

7:10 am-1:40 pm

1 stop6h 30m

Chicago O'Hare Intl

Mon 1/12

1:55 pm-8:43 pm

1 stop6h 48m

$157

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Fri 1/16

6:35 am-1:08 pm

1 stop6h 33m

Chicago O'Hare Intl

Fri 1/23

8:50 am-2:38 pm

1 stop5h 48m

$157

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Thu 12/25

6:29 am-12:54 pm

1 stop6h 25m

Chicago O'Hare Intl

Thu 1/8

5:30 am-11:02 am

1 stop5h 32m

$157

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Wed 1/21

5:04 pm-11:56 pm

1 stop6h 52m

Chicago O'Hare Intl

Sat 1/31

8:50 am-2:38 pm

1 stop5h 48m

$157

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Tue 1/20

10:19 am-4:57 pm

1 stop6h 38m

Chicago O'Hare Intl

Fri 1/23

9:55 am-5:50 pm

1 stop7h 55m

$157

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Sat 1/17

3:40 pm-9:43 pm

1 stop6h 03m

Chicago O'Hare Intl

Sun 1/18

6:15 am-10:43 am

1 stop4h 28m

$157

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Thu 12/25

6:29 am-12:54 pm

1 stop6h 25m

Chicago O'Hare Intl

Wed 12/31

6:35 am-11:12 am

1 stop4h 37m

$157

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Fri 1/9

6:40 pm-8:23 pm

Nonstop1h 43m

$46

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Thu 1/22

8:05 am-9:40 am

Nonstop1h 35m

$46

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/3

Showing 1-10 of 19 results
1
2

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 December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
MytripPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice 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 Mytrip to be most consistent on Cheapflights vs. Mytrip Users can find the same prices on St. Louis-Chicago O'Hare Intl Airport flight deals on Cheapflights vs. Mytrip >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 Mytrip the most. Mytrip 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 November 28, 2025.

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 $93). Flying from St. Louis to Chicago O'Hare Intl Airport in August is currently the most expensive (average of $159). 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 December 4, 2025.

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 November 29, 2025.

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. Saturday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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
Airlines
Lufthansa

Lufthansa's Economy Flex offers preferred seating and same-day flight changes.


Lufthansa's Free Neighbor Seat allows extra space for a fee on long-haul flights.

Read more about Lufthansaby Blane Bachelor
United Airlines

Basic Economy on United allows no carry-on bags, only a personal item.


Prepay checked bag fees 24 hours before to save money on United flights.

Read more about United Airlinesby Harriet Baskas
Airports
STL

Security lines at STL are straightforward, averaging 5-10 minutes off-peak. Check real-time wait times online before heading to the airport.

Read more about STLby Taryn White
ORD

For a quick city trip from ORD, take the 'L' train. It's often faster than taxis due to Chicago traffic.

Read more about ORDby Ramsey Qubein
Our travel experts
Blane Bachelor

Blane Bachelor

Expert on Lufthansa

Blane Bachelor

Blane Bachelor

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 Baskas

Harriet Baskas

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

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

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 December 4, 2025.
See what other customers who have flown with United Airlines, American Airlines, and Southern / 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
9,066 reviews

Food

6.6

Crew

8.1

Boarding

7.7

Overall

7.4

Entertainment

7.1

Comfort

7.3

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
9,066 reviews
United Airlines
7.4
Good
9,066 reviews

Food

6.6

Crew

8.1

Boarding

7.7

Overall

7.4

Entertainment

7.1

Comfort

7.3

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
7.2
Good
11,045 reviews
United Airlines
7.4
Good
9,066 reviews

Food

6.6

Crew

8.1

Boarding

7.7

Overall

7.4

Entertainment

7.1

Comfort

7.3

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
6.4
Okay
27 reviews
United Airlines
7.4
Good
9,066 reviews

Food

6.6

Crew

8.1

Boarding

7.7

Overall

7.4

Entertainment

7.1

Comfort

7.3

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 52 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 can get you from St. Louis to Chicago O'Hare Intl Airport in just under 5h 37m. Your travel time can differ by up to . The distance between St. Louis and Chicago O'Hare Intl Airport is about 258 mi.

  • 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 $107. Additional round-trip tickets that might be worth considering are offered by United Airlines and Southern / Mokulele, with the lowest prices starting at $114 and $140, respectively. American Airlines is 61% 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 $48. Users have also found prices from $73 and $85 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: American Airlines (78%), Qatar Airways (78%), Austrian Airlines( 78%).

  • 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 $119. On average you can expect to pay $807. The most popular route, (Lambert-St Louis - Chicago O'Hare Intl), can usually be booked for $91.

  • 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 $93). Flying from St. Louis to Chicago O'Hare Intl Airport in August is currently the most expensive (average of $159). 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
Schaumburg
Rosemont
Gurnee
Elgin
Naperville
Hoffman Estates
Beloit
Delavan
Oak Brook
Downers Grove
Des Plaines
Elk Grove Village
Skokie
Lake Geneva
Bridgeview
Warrenville
Waukegan
Aurora
Kenosha
Evanston

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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 December 4, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$109Average$285FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$114Average$309FlexibilityNo cancel feeOn-time69%
Southern / MokuleleCheapest$140Average$207FlexibilityNo cancel feeOn-timeN/A

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