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$79+ 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 9/11. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — STL
Sep 10 — Sep 171
Thu 9/10
Thu 9/17
1 adult, Economy
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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 August 11, 2026.

This Expedia deal was found by Cheapflights users on 8/11. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/56:25 am -
1 stop6h 45m
Thu 10/810:35 am -
1 stop11h 23m
Deal found 8/11$154
This Frontier deal was found by Cheapflights users on 8/11. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/288:55 pm -
1 stop14h 37m
Thu 10/110:20 am -
1 stop9h 15m
Deal found 8/11$154
This Delta deal was found by Cheapflights users on 8/11. 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.
Sat 9/56:00 am -
1 stop4h 23m
Sun 9/611:13 am -
1 stop3h 46m
Deal found 8/11$157
This Kiwi.com deal was found by Cheapflights users on 8/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2010:26 am -
1 stop26h 44m
Fri 9/252:29 pm -
1 stop27h 54m
Deal found 8/10$159
This Kiwi.com deal was found by Cheapflights users on 8/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/39:20 am -
1 stop7h 11m
Mon 9/76:17 pm -
1 stop13h 36m
Deal found 8/11$160
This CheapOair deal was found by Cheapflights users on 8/6. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/188:55 pm -
1 stop14h 37m
Tue 9/2212:17 pm -
1 stop17h 21m
Deal found 8/6$166
This Southwest deal was found by Cheapflights users on 8/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/56:35 am -
Nonstop1h 10m
Sun 9/64:20 pm -
Nonstop1h 05m
Deal found 8/11$168
This Kiwi.com deal was found by Cheapflights users on 8/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/317:05 am -
1 stop10h 17m
Fri 9/46:17 pm -
1 stop25h 51m
Deal found 8/10$168
This Kissandfly.com deal was found by Cheapflights users on 8/11. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/56:00 am -
1 stop4h 23m
Sun 9/66:17 pm -
1 stop13h 36m
Deal found 8/11$169
This Southwest deal was found by Cheapflights users on 8/7. 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 8/297:40 am -
1 stop5h 50m
Sat 8/293:00 pm -
1 stop4h 35m
Deal found 8/7$171
This Delta deal was found by Cheapflights users on 8/7. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/296:00 am -
1 stop4h 23m
Sat 8/295:34 pm -
1 stop4h 13m
Deal found 8/7$171
This Kiwi.com deal was found by Cheapflights users on 8/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/96:20 am -
1 stop6h 50m
Wed 9/168:10 pm -
1 stop28h 13m
Deal found 8/10$174

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 August 11, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$154
(Expedia)

One-way from

$79
(Delta)

Popular in

April

Cheapest in

December

Average price

$407

Good round-trip deal

$265 or less

Good one-way deal

$208 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. 16% potential increase in price ($92 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($17 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 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 August 11, 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 Chicago O'Hare Intl - STL Lambert-St Louis

ORDSTL

Chicago O'Hare Intl

Sat 9/5

2:30 pm-8:42 pm

1 stop6h 12m

Lambert-St Louis

Sun 9/6

6:20 am-11:37 am

1 stop5h 17m

$198

ChicagoSt. Louis

MDW Chicago Midway - STL Lambert-St Louis

MDWSTL

Chicago Midway

Fri 9/25

8:55 pm-10:10 pm

Nonstop1h 15m

Lambert-St Louis

Sat 9/26

6:45 am-1:05 pm

2 stops6h 20m

$215

ChicagoSt. Louis

ORD Chicago O'Hare Intl - STL Lambert-St Louis

ORDSTL

Chicago O'Hare Intl

Wed 9/9

6:29 pm-8:00 pm

Nonstop1h 31m

Lambert-St Louis

Thu 9/10

8:00 am-9:34 am

Nonstop1h 34m

$217
Quickest round-trip

ChicagoSt. Louis

MDW Chicago Midway - STL Lambert-St Louis

MDWSTL

Chicago Midway

Thu 9/3

8:55 pm-10:10 pm

Nonstop1h 15m

Lambert-St Louis

Mon 9/7

2:20 pm-3:30 pm

Nonstop1h 10m

$219

ChicagoSt. Louis

MDW Chicago Midway - STL Lambert-St Louis

MDWSTL

Chicago Midway

Fri 11/13

3:05 pm-7:05 pm

1 stop4h 00m

Lambert-St Louis

Tue 11/17

10:15 am-2:35 pm

1 stop4h 20m

$220

ChicagoSt. Louis

MDW Chicago Midway - STL Lambert-St Louis

MDWSTL

Chicago Midway

Wed 9/23

2:00 pm-3:10 pm

Nonstop1h 10m

Lambert-St Louis

Wed 9/30

4:45 pm-10:25 pm

1 stop5h 40m

$229

ChicagoSt. Louis

MDW Chicago Midway - STL Lambert-St Louis

MDWSTL

Chicago Midway

Tue 9/8

4:30 pm-7:50 pm

1 stop3h 20m

Lambert-St Louis

Tue 9/15

12:50 pm-1:55 pm

Nonstop1h 05m

$229

ChicagoSt. Louis

ORD Chicago O'Hare Intl - STL Lambert-St Louis

ORDSTL

Chicago O'Hare Intl

Fri 8/28

6:00 am-10:23 am

1 stop4h 23m

Lambert-St Louis

Tue 9/1

6:30 am-10:42 am

1 stop4h 12m

$230

ChicagoSt. Louis

MDW Chicago Midway - STL Lambert-St Louis

MDWSTL

Chicago Midway

Thu 10/15

6:25 pm-11:15 pm

1 stop4h 50m

Lambert-St Louis

Mon 10/19

2:00 pm-3:05 pm

Nonstop1h 05m

$231

ChicagoSt. Louis

MDW Chicago Midway - STL Lambert-St Louis

MDWSTL

Chicago Midway

Thu 11/5

3:05 pm-9:00 pm

1 stop5h 55m

Lambert-St Louis

Mon 11/9

5:45 am-6:55 am

Nonstop1h 10m

$231

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/10

Showing 1-10 of 45 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 August.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice 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 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

What is the cheapest month to book a flight from Chicago to St. Louis?

Currently, December is the cheapest month in which you can book a flight from Chicago to St. Louis (average of $214). Flying from Chicago to St. Louis in April is currently the most expensive (average of $601). 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 August 11, 2026.

Unlike in the evening, when flights are generally more expensive, you can save up to 39% on flights from Chicago to St. Louis by exploring options for tickets at noon.

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 August 11, 2026.

The most flights from CHI to STL are scheduled on a Monday (70 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (3 on average).

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

Airfare is below average for this route at the moment.
Chicago to St. Louis flights typically cost between $195 and $519 in October.
The cheapest round-trip price found within the last 5 days was $154 on Frontier (Oct 5-Oct 8).

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

About 20% of weekly flights between Chicago and St. Louis have experienced delays in the past year, with the average delay time being 120 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 14% of flights being delayed.

How far ahead should I book a flight from Chicago to St. Louis?

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 78 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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 August 8, 2026.

Travelers seeking maximum savings on their Chicago to St. Louis flight should consider departing on Saturday afternoons when fares are most often at their lowest. Sunday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

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 August 11, 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
4,220 reviews

Entertainment

7.5

Crew

8.6

Comfort

8.0

Food

7.0

Overall

8.0

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.
Southwest
8.0
Very good
4,220 reviews
Southwest
8.0
Very good
4,220 reviews

Entertainment

7.5

Crew

8.6

Comfort

8.0

Food

7.0

Overall

8.0

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.
United Airlines
7.4
Good
10,104 reviews
Southwest
8.0
Very good
4,220 reviews

Entertainment

7.5

Crew

8.6

Comfort

8.0

Food

7.0

Overall

8.0

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.
American Airlines
7.1
Good
11,903 reviews
Southwest
8.0
Very good
4,220 reviews

Entertainment

7.5

Crew

8.6

Comfort

8.0

Food

7.0

Overall

8.0

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

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 26 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 Delta, Southwest, and United Airlines fly from Chicago to St. Louis in about 1h 15m. The time it takes to get you to your destination can typically vary by up to 4h 57m. The distance from Chicago to St. Louis is about 251 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 $117, was found to be the cheapest airline from Chicago to St. Louis.Alternate airlines to your destination round-trip include United Airlines and Southern / Mokulele. These flights start at 74% 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 $58 on American Airlines. Other airlines that offer cheap prices include United Airlines from $59 and Southern / Mokulele from $107 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 Envoy Air (77%), Japan Airlines (75%) or United Airlines (74%) 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 $123. On average you can expect to pay $404. The most popular route, (Chicago O'Hare Intl - Lambert-St Louis), can usually be booked for $117.

  • 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, December is the cheapest month in which you can book a flight from Chicago to St. Louis (average of $214). Flying from Chicago to St. Louis in April is currently the most expensive (average of $601). 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
Fairview Heights
O'Fallon
Fenton
Swansea
Eureka
Maryland Heights
Collinsville
Wentzville
Glencoe
Chesterfield
Farmington

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 August 11, 2026.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$117Average$511FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$163Average$499FlexibilityNo cancel feeOn-time69%
Southern / MokuleleCheapest$165Average$213FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$168Average$380FlexibilityNo cancel feeOn-time71%

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