Avoid traffic delays by taking the 'L' train to ORD, a reliable option from downtown Chicago.
$46+ Cheap flights from Chicago (CHI) 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 8/23. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — STL
Jul 19 — Jul 261
1 adult, Economy
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Find cheap flights from Chicago to St. Louis 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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Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheapflights Tip: The best prices from Chicago to Lambert-St Louis are usually found in September or April, booked 84 days in advance, depart on a Thursday or Friday and return on a Thursday
Cheap flight deals from Chicago to St. Louis
Discover tips and strategies to find the most affordable flight options for your journey from Chicago (CHI) 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 July 14, 2025.
Round-trip from | $90 (American Airlines) |
|---|---|
One-way from | $46 (Southwest) |
Popular in | July |
Cheapest in | September |
Average price | $351 |
Good round-trip deal | $278 or less |
Good one-way deal | $133 or less |
Find flight deals from Chicago to St. Louis
Cheapest flights from Chicago to St. LouisExplore the most affordable flight options available from Chicago to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 14, 2025.
Explore the most affordable flight options available from Chicago to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 14, 2025.
This American Airlines deal was found by Cheapflights users on 7/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/207:10 pmORD - STL
Nonstop1h 22mAmerican Airlines
Sat 10/46:10 amSTL - ORD
Nonstop1h 20mAmerican Airlines
Deal found 7/12![American Airlines logo]()
$90
This Southwest deal was found by Cheapflights users on 7/14. 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.
Wed 8/139:00 amMDW - STL
Nonstop1h 15mSouthwest
Sat 8/167:20 amSTL - MDW
Nonstop1h 10mSouthwest
Deal found 7/14![Southwest logo]()
$91
This United Airlines deal was found by Cheapflights users on 7/14. 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.
Wed 8/69:20 pmORD - STL
Nonstop1h 25mUnited Airlines
Thu 8/78:00 amSTL - ORD
Nonstop1h 25mUnited Airlines
Deal found 7/14![United Airlines logo]()
$94
This Southwest deal was found by Cheapflights users on 7/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1211:25 amORD - STL
1 stop8h 35mSouthwest
Tue 8/196:25 amSTL - ORD
1 stop6h 20mSouthwest
Deal found 7/13![Southwest logo]()
$111
This Kissandfly.com deal was found by Cheapflights users on 7/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/96:55 amORD - STL
Nonstop1h 25mSouthern / Mokulele
Mon 8/111:00 pmSTL - ORD
1 stop3h 32mSouthern / Mokulele
Deal found 7/13![Southern / Mokulele logo]()
$134
This Delta deal was found by Cheapflights users on 7/11. 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 8/59:25 amMDW - STL
1 stop3h 56mDelta
Tue 10/142:18 pmSTL - MDW
1 stop4h 18mDelta
Deal found 7/11![Delta logo]()
$177
This Delta deal was found by Cheapflights users on 7/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/57:10 amORD - STL
1 stop6h 11mDelta
Wed 8/61:29 pmSTL - ORD
1 stop5h 20mDelta
Deal found 7/12![Delta logo]()
$177
This Priceline deal was found by Cheapflights users on 7/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/176:20 amMDW - STL
1 stop7h 14mFrontier
Sat 7/192:52 pmSTL - MDW
1 stop7h 43mFrontier
Deal found 7/13![Frontier logo]()
$188
Cheapflights Fare Finder
Customize your flight search to find flights from Chicago 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 July 14, 2025.
Use the filters below to find and compare flights from Chicago to St. Louis that are best for you.
Fly from
Chicago
Fly to
St. Louis
Route
Depart
Return
Price
ChicagoSt. Louis
ORD - STL
ORDSTL
Chicago O'Hare Intl
Sat 9/20
7:10 pm-8:32 pm
Nonstop1h 22m
Lambert-St Louis
Sat 10/4
6:10 am-7:30 am
Nonstop1h 20m
$90
ChicagoSt. Louis
MDW - STL
MDWSTL
Chicago Midway
Wed 8/13
9:00 am-10:15 am
Nonstop1h 15m
Lambert-St Louis
Sat 8/16
7:20 am-8:30 am
Nonstop1h 10m
$91
ChicagoSt. Louis
ORD - STL
ORDSTL
Chicago O'Hare Intl
Wed 8/6
9:20 pm-10:45 pm
Nonstop1h 25m
Lambert-St Louis
Thu 8/7
8:00 am-9:25 am
Nonstop1h 25m
$94
ChicagoSt. Louis
ORD - STL
ORDSTL
Chicago O'Hare Intl
Tue 8/12
11:25 am-8:00 pm
1 stop8h 35m
Lambert-St Louis
Tue 8/19
6:25 am-12:45 pm
1 stop6h 20m
$111
ChicagoSt. Louis
ORD - STL
ORDSTL
Chicago O'Hare Intl
Sat 8/9
6:55 am-8:20 am
Nonstop1h 25m
Lambert-St Louis
Mon 8/11
1:00 pm-4:32 pm
1 stop3h 32m
$134
ChicagoSt. Louis
MDW - STL
MDWSTL
Chicago Midway
Tue 8/5
9:25 am-1:21 pm
1 stop3h 56m
Lambert-St Louis
Tue 10/14
2:18 pm-6:36 pm
1 stop4h 18m
$177
ChicagoSt. Louis
ORD - STL
ORDSTL
Chicago O'Hare Intl
Tue 8/5
7:10 am-1:21 pm
1 stop6h 11m
Lambert-St Louis
Wed 8/6
1:29 pm-6:49 pm
1 stop5h 20m
$177
ChicagoSt. Louis
MDW - STL
MDWSTL
Chicago Midway
Thu 7/17
6:20 am-1:34 pm
1 stop7h 14m
Lambert-St Louis
Sat 7/19
2:52 pm-10:35 pm
1 stop7h 43m
$188
ChicagoSt. Louis
MDW - STL
MDWSTL
Chicago Midway
Sat 8/23
3:55 pm-5:10 pm
Nonstop1h 15m
$46
ChicagoSt. Louis
ORD - STL
ORDSTL
Chicago O'Hare Intl
Sat 8/23
2:20 pm-3:44 pm
Nonstop1h 24m
$46
Showing 1-10 of 20 results
The best insider tips for Chicago to St. Louis flights
Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Chicago to St. Louis trip
Best time to book a flight from Chicago to St. Louis
Have a flexible travel schedule? Discover the best time to fly to St. Louis from Chicago 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 to St. Louis
How far ahead should I book a flight from Chicago to St. Louis?
Use this chart to determine the optimal time to book a round-trip flight from Chicago to St. Louis. Price data was last updated on July 11, 2025.
The price you pay for your flight from Chicago to St. Louis may vary depending on when you book. For the best chance of a lower fare, look to book 84 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 to St. Louis?
Currently, August is the cheapest month in which you can book a flight from Chicago to St. Louis (average of $311). Flying from Chicago to St. Louis in March is currently the most expensive (average of $356). 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 CHI to STL?
Find hourly flight availability from Chicago 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 July 14, 2025.
Unlike in the morning, when flights are generally more expensive, you can save up to 32% on flights from Chicago to St. Louis by exploring options for tickets in the evening.
What is the cheapest day to fly from Chicago to St. Louis?
Use this chart to determine the cheapest time to fly round-trip from Chicago to St. Louis. Price data was last updated on July 6, 2025.
Travelers seeking maximum savings on their Chicago to St. Louis flight should consider departing on Tuesday afternoons 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.
Weekly flight availability from Chicago to St. Louis
Explore weekly flight availability from Chicago to St. Louis. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated July 14, 2025.
The most flights from CHI to STL are scheduled on a Monday (78 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (65 on average).
How much does it cost to fly round-trip from Chicago to St. Louis?
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 July 14, 2025.
See what other customers who have flown with Southwest, Delta, and United Airlines from Chicago to St. Louis have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.6
Comfort
8.0
Food
7.0
Overall
8.0
Boarding
8.1
Entertainment
7.6
Reviews
1 / 20
8.0
ExcellentJohn,May 2025
PVD - BNA
Crew
8.6
Comfort
8.0
Food
7.0
Overall
8.0
Boarding
8.1
Entertainment
7.6
Reviews
1 / 20
8.0
ExcellentJohn,May 2025
PVD - BNA
Crew
8.6
Comfort
8.0
Food
7.0
Overall
8.0
Boarding
8.1
Entertainment
7.6
Reviews
1 / 20
8.0
ExcellentJohn,May 2025
PVD - BNA
Crew
8.6
Comfort
8.0
Food
7.0
Overall
8.0
Boarding
8.1
Entertainment
7.6
Reviews
1 / 20
8.0
ExcellentJohn,May 2025
PVD - BNA
Crew
8.6
Comfort
8.0
Food
7.0
Overall
8.0
Boarding
8.1
Entertainment
7.6
Reviews
1 / 20
8.0
ExcellentJohn,May 2025
PVD - BNA
Related info for your journey
Find useful and relevant information for your journey from Chicago to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near St. Louis?
Book flights to St. Louis if you plan to visit one of these locationsO'Fallon
Maryland Heights
Fairview Heights
Collinsville
Eureka
St. Peters
Glencoe
Alton
Festus
Chesterfield
Farmington
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Alternative routes for Chicago to St. Louis
See prices for flight routes from nearby airports that may be better suited for you.
Top 4 airlines flying from Chicago to St. Louis
Discover the top 4 airlines that operate flights from Chicago 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 July 14, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$115 | Average$287 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$116 | Average$328 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$118 | Average$207 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$152 | Average$321 | FlexibilityNo cancel fee | On-time69% |