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St. Louis

$49+ 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 4/1. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — STL
Apr 9 — Apr 161
Thu 4/9
Thu 4/16
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

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Cheapflights Tip: The best prices from Chicago to Lambert-St Louis are usually found in December or November, booked 85 days in advance, depart on a Thursday or Friday and return on a Thursday

Cheap flight deals from Chicago to St. Louis

Cheapest flights from Chicago to St. Louis
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 March 10, 2026.

This Southwest deal was found by Cheapflights users on 3/7. 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.
Sat 4/46:25 pm
MDW
-
STL
1 stop5h 10m
Southwest
Sat 4/115:15 am
STL
-
MDW
2 stops6h 55m
Southwest
Deal found 3/7$234
This United Airlines deal was found by Cheapflights users on 3/9. 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 5/127:45 pm
ORD
-
STL
Nonstop1h 28m
United Airlines
Sat 5/167:45 am
STL
-
ORD
Nonstop1h 27m
United Airlines
Deal found 3/9$234
This Southwest deal was found by Cheapflights users on 3/5. 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.
Thu 3/267:45 am
MDW
-
STL
Nonstop1h 15m
Southwest
Thu 3/269:50 pm
STL
-
MDW
Nonstop1h 10m
Southwest
Deal found 3/5$235
This Frontier deal was found by Cheapflights users on 3/9. 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 5/299:16 pm
MDW
-
STL
1 stop10h 31m
Frontier
Sun 5/3111:32 am
STL
-
MDW
1 stop7h 04m
Frontier
Deal found 3/9$236
This Southwest deal was found by Cheapflights users on 3/9. 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 5/1211:35 am
MDW
-
STL
2 stops6h 20m
Southwest
Fri 5/158:25 am
STL
-
MDW
2 stops6h 30m
Southwest
Deal found 3/9$237
This Delta deal was found by Cheapflights users on 3/9. 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 5/51:36 pm
ORD
-
STL
2 stops9h 37m
Delta
Thu 5/76:21 am
STL
-
ORD
2 stops6h 40m
Delta
Deal found 3/9$238
This Kiwi.com deal was found by Cheapflights users on 3/6. 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 3/265:01 am
ORD
-
STL
1 stop5h 30m
Multiple Airlines
Mon 3/304:51 pm
STL
-
ORD
2 stops15h 32m
Multiple Airlines
Deal found 3/6$240
This American Airlines deal was found by Cheapflights users on 3/6. 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.
Fri 3/2710:22 pm
ORD
-
STL
Nonstop1h 13m
American Airlines
Sat 3/288:00 am
STL
-
ORD
Nonstop1h 31m
American Airlines
Deal found 3/6$241
This eDestinos deal was found by Cheapflights users on 3/10. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/26:00 am
MDW
-
STL
1 stop11h 34m
Frontier
Thu 4/96:29 pm
STL
-
MDW
1 stop27h 50m
Frontier
Deal found 3/10$243
This eDestinos deal was found by Cheapflights users on 3/10. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/25:15 am
ORD
-
STL
1 stop12h 19m
Frontier
Thu 4/96:29 pm
STL
-
ORD
1 stop28h 10m
Frontier
Deal found 3/10$243
This Southwest deal was found by Cheapflights users on 3/9. 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.
Fri 4/107:50 am
MDW
-
STL
Nonstop1h 15m
Southwest
Sat 4/115:40 am
STL
-
MDW
Nonstop1h 10m
Southwest
Deal found 3/9$244
This American Airlines deal was found by Cheapflights users on 3/5. 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.
Fri 5/112:38 pm
ORD
-
STL
Nonstop1h 25m
American Airlines
Mon 5/48:03 pm
STL
-
ORD
Nonstop1h 37m
American Airlines
Deal found 3/5$244

Find 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 March 10, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$234
(Southwest)

One-way from

$49
(Southwest)

Popular in

January

Cheapest in

December

Average price

$477

Good round-trip deal

$303 or less

Good one-way deal

$150 or less
Provider with most accurate pricing for Chicago (CHI)-Lambert-St Louis flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-Lambert-St Louis flights.
Search Deals
From Chicago (CHI) to Lambert-St Louis
Search Deals
One-way flight from Chicago (CHI) to Lambert-St Louis
Search Deals
Highest demand for flights based on searches. 21% potential increase in price ($96 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($23 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals
Price to beat on a round-trip flight from Chicago (CHI) to Lambert-St Louis.
Search Deals
Price to beat on a one-way flight from Chicago (CHI) to Lambert-St Louis.
Search Deals

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 March 10, 2026.
Use the filters below to find and compare flights from Chicago to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Sun 4/26

2:40 pm-11:45 pm

1 stop9h 05m

Lambert-St Louis

Tue 4/28

8:35 am-3:00 pm

1 stop6h 25m

$243

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Wed 4/22

2:35 pm-8:00 pm

1 stop5h 25m

Lambert-St Louis

Wed 4/29

1:15 pm-7:35 pm

2 stops6h 20m

$245

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Fri 4/10

9:30 pm-10:45 pm

Nonstop1h 15m

Lambert-St Louis

Mon 4/13

4:10 pm-9:15 pm

1 stop5h 05m

$254

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Fri 3/27

9:55 pm-11:10 pm

Nonstop1h 15m

Lambert-St Louis

Sat 3/28

8:25 am-11:55 am

1 stop3h 30m

$265

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 4/30

7:00 am-1:05 pm

1 stop6h 05m

Lambert-St Louis

Sun 5/3

6:48 am-10:19 am

1 stop3h 31m

$274

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Wed 5/20

2:40 pm-10:00 pm

1 stop7h 20m

Lambert-St Louis

Thu 6/4

5:35 am-2:35 pm

1 stop9h 00m

$275

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Thu 3/26

7:45 am-1:45 pm

1 stop6h 00m

Lambert-St Louis

Mon 3/30

1:40 pm-8:10 pm

2 stops6h 30m

$290

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Thu 4/2

9:35 am-12:58 pm

1 stop3h 23m

Lambert-St Louis

Thu 4/9

6:32 am-12:29 pm

1 stop5h 57m

$304

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Mon 4/20

1:36 pm-11:13 pm

2 stops9h 37m

Lambert-St Louis

Mon 4/27

6:20 am-12:45 pm

2 stops6h 25m

$315

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Fri 5/22

10:40 am-12:11 pm

Nonstop1h 31m

Lambert-St Louis

Mon 5/25

6:00 am-7:30 am

Nonstop1h 30m

$317

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/9

Showing 1-10 of 44 resultsSorted by cheapest first
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Compare providers for flights from Chicago 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 Chicago to St. Louis in March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice 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-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-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Chicago-St. Louis flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Chicago-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-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 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 March 6, 2026.

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 $77). Flying from Chicago to St. Louis in February is currently the most expensive (average of $243). 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 March 10, 2026.

Unlike in the evening, when flights are generally more expensive, you can save up to 23% on flights from Chicago to St. Louis by exploring options for tickets at noon.

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 February 21, 2026.

Travelers seeking maximum savings on their Chicago to St. Louis flight should consider departing on Tuesday at noon when fares are most often at their lowest. Monday evenings 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 March 10, 2026.

The most flights from CHI to STL are scheduled on a Monday (69 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (35 on average).

How much does it cost to fly round-trip from Chicago to St. Louis?

How often are flights from Chicago to St. Louis delayed?

About 17% of weekly flights between Chicago and St. Louis have experienced delays in the past year, with the average delay time being 119 minutes.

What is the most punctual flight time for Chicago to St. Louis flights?

Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the evening tend to experience delays more often.

What day of the week experiences the fewest flight delays on this route?

Tuesday tends to have the lowest number of delays on this route, whereas Sunday has historically faced a higher average of delays compared to other days of the week.

Which airline has the best punctuality record on Chicago to St. Louis flights?

Over the last year, Southwest have had the lowest number of delays on this route, with just 12% of flights being delayed.

The best insider tips for Chicago 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 to St. Louis trip
Our travel experts
Ramsey Qubein

Ramsey Qubein

Expert on ORD and MDW

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 March 10, 2026.
See what other customers who have flown with Southwest,United Airlines, andAmerican 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.
Southwest
8.0
Very good
4,318 reviews

Comfort

8.0

Entertainment

7.5

Overall

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Mar 2026

KOA - HNL

pretty smooth and fast service ever, that flight is very helpful each and everyone for price and also fright for free..
Southwest
8.0
Very good
4,318 reviews
Southwest
8.0
Very good
4,318 reviews

Comfort

8.0

Entertainment

7.5

Overall

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Mar 2026

KOA - HNL

pretty smooth and fast service ever, that flight is very helpful each and everyone for price and also fright for free..
United Airlines
7.4
Good
9,409 reviews
Southwest
8.0
Very good
4,318 reviews

Comfort

8.0

Entertainment

7.5

Overall

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Mar 2026

KOA - HNL

pretty smooth and fast service ever, that flight is very helpful each and everyone for price and also fright for free..
American Airlines
7.1
Good
11,409 reviews
Southwest
8.0
Very good
4,318 reviews

Comfort

8.0

Entertainment

7.5

Overall

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Mar 2026

KOA - HNL

pretty smooth and fast service ever, that flight is very helpful each and everyone for price and also fright for free..
Southern / Mokulele
6.5
Okay
27 reviews
Southwest
8.0
Very good
4,318 reviews

Comfort

8.0

Entertainment

7.5

Overall

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Mar 2026

KOA - HNL

pretty smooth and fast service ever, that flight is very helpful each and everyone for price and also fright for free..

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.

  • What airport do you fly into for flights to St. Louis from Chicago?

    If you book a flight to St. Louis from Chicago, you will be flying to 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 51 flights from Chicago to Lambert-St Louis per day from 4 different airlines.

  • How long is the flight from Chicago to St. Louis?

    Airlines like Southwest, Delta, and United Airlines fly from Chicago to St. Louis in about 1h 31m. The time it takes to get you to your destination can typically vary by up to 7h 34m. The distance from Chicago to St. Louis is about 258 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines flying from Chicago to St. Louis round-trip?

    Southwest, at $77, was found to be the cheapest airline from Chicago to St. Louis.Alternate airlines to your destination round-trip include American Airlines and United Airlines. These flights start at 78% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from Chicago to St. Louis one-way?

    One-way options have recently been found by users for as low as $48 on American Airlines. Other airlines that offer cheap prices include Southwest from $55 and United Airlines from $58 one-way.

  • What are the most reliable airlines from Chicago to St. Louis?

    No one likes to see their flight delayed. When booking a flight from Chicago to St. Louis consider choosing Republic Airways (89%), Austrian Airlines (87%) or Turkish Airlines (78%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Chicago to St. Louis?

    The cheapest flight price from Chicago to St. Louis is $48. On average you can expect to pay $424. The most popular route, (Chicago O'Hare Intl - Lambert-St Louis), can usually be booked for $154.

  • Can I find deals for flights from Chicago to St. Louis that include hotel bookings?

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

  • How can I find direct flights from Chicago to St. Louis?

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

  • Can I find deals for business class flights from Chicago to St. Louis?

    Yes. Cheapflights offers flight deals from Chicago 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 to St. Louis?

    Currently, August is the cheapest month in which you can book a flight from Chicago to St. Louis (average of $77). Flying from Chicago to St. Louis in February is currently the most expensive (average of $243). 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
Fenton
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Wentzville
Glencoe
Chesterfield
Alton
Farmington
Festus

Browse thousands of different options on Cheapflights for your next trip

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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 March 10, 2026.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$77Average$426FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$115Average$312FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$144Average$381FlexibilityNo cancel feeOn-time69%
Southern / MokuleleCheapest$156Average$227FlexibilityNo cancel feeOn-timeN/A

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