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$67+ 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 2/21. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — STL
Jan 22 — Jan 291
Thu 1/22
Thu 1/29
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 Chicago to Lambert-St Louis are usually found in November or February, 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 December 23, 2025.

This American Airlines deal was found by Cheapflights users on 12/21. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/312:57 pmORD - STL
Nonstop1h 26mAmerican Airlines
Tue 1/136:00 amSTL - ORD
Nonstop1h 27mAmerican Airlines
Deal found 12/21$187
This Delta deal was found by Cheapflights users on 12/22. 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.
Wed 12/315:31 pmORD - STL
1 stop6h 07mDelta
Tue 1/1311:23 amSTL - ORD
1 stop6h 32mDelta
Deal found 12/22$204
This American Airlines deal was found by Cheapflights users on 12/21. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/312:57 pmORD - STL
Nonstop1h 26mAmerican Airlines
Thu 1/19:08 amSTL - ORD
Nonstop1h 27mAmerican Airlines
Deal found 12/21$215
This Frontier deal was found by Cheapflights users on 12/22. 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.
Wed 12/3111:23 amORD - STL
1 stop11h 10mFrontier
Sun 1/410:57 amSTL - ORD
1 stop11h 27mFrontier
Deal found 12/22$217
This eDestinos deal was found by Cheapflights users on 12/21. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/306:00 amORD - STL
2 stops40h 33mFrontier
Tue 1/135:11 pmSTL - ORD
2 stops23h 41mFrontier
Deal found 12/21$373
This Kiwi.com deal was found by Cheapflights users on 12/22. 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 12/316:12 amMDW - STL
1 stop27h 28mFrontier
Sun 1/410:57 amSTL - MDW
1 stop26h 24mFrontier
Deal found 12/22$379
This Kiwi.com deal was found by Cheapflights users on 12/22. 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 12/316:05 amORD - STL
1 stop27h 35mMultiple Airlines
Sun 1/410:57 amSTL - ORD
2 stops26h 13mMultiple Airlines
Deal found 12/22$385
This Delta deal was found by Cheapflights users on 12/22. 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.
Wed 12/315:59 pmMDW - STL
1 stop4h 17mDelta
Fri 1/25:13 pmSTL - MDW
1 stop5h 09mDelta
Deal found 12/22$433
This Southwest deal was found by Cheapflights users on 12/22. 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 12/307:55 amMDW - STL
Nonstop1h 15mSouthwest
Fri 1/28:35 pmSTL - MDW
Nonstop1h 10mSouthwest
Deal found 12/22$611
This Kiwi.com deal was found by Cheapflights users on 12/22. 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 12/313:32 pmMDW - STL
2 stops18h 08mFrontier
Fri 1/210:40 amSTL - MDW
1 stop11h 18mFrontier
Deal found 12/22$613
This Delta deal was found by Cheapflights users on 12/21. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/285:59 pmMDW - STL
1 stop4h 17mDelta
Mon 12/296:05 amSTL - MDW
1 stop5h 01mDelta
Deal found 12/21$631
This Southwest deal was found by Cheapflights users on 12/21. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/2511:25 amMDW - STL
Nonstop1h 10mSouthwest
Sat 12/2710:45 pmSTL - MDW
Nonstop1h 10mSouthwest
Deal found 12/21$654

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 December 23, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$141
(Kiwi.com)

One-way from

$67
(Kiwi.com)

Popular in

October

Cheapest in

November

Average price

$270

Good round-trip deal

$228 or less

Good one-way deal

$128 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. 2% potential increase in price ($8 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($8 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 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 December 23, 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

Mon 1/12

9:25 pm-10:58 pm

Nonstop1h 33m

Lambert-St Louis

Tue 1/13

3:11 pm-4:55 pm

Nonstop1h 44m

$162

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 1/20

8:50 am-2:38 pm

1 stop5h 48m

Lambert-St Louis

Wed 1/21

6:00 am-1:40 pm

1 stop7h 40m

$173

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Mon 1/12

12:44 pm-10:33 pm

1 stop9h 49m

Lambert-St Louis

Tue 1/13

5:11 pm-12:08 pm

2 stops18h 57m

$173

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Mon 1/12

7:16 pm-11:25 pm

1 stop4h 09m

Lambert-St Louis

Tue 1/13

12:00 pm-4:29 pm

1 stop4h 29m

$182

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Wed 1/14

11:05 am-4:37 pm

1 stop5h 32m

Lambert-St Louis

Thu 1/15

6:10 am-1:08 pm

2 stops6h 58m

$187

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Mon 1/12

5:59 pm-11:39 pm

1 stop5h 40m

Lambert-St Louis

Tue 1/13

11:23 am-9:05 pm

2 stops9h 42m

$187

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Sat 1/31

11:00 am-4:55 pm

1 stop5h 55m

Lambert-St Louis

Mon 2/2

5:55 pm-7:05 pm

Nonstop1h 10m

$191

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 1/15

7:45 am-10:34 pm

2 stops14h 49m

Lambert-St Louis

Mon 1/19

8:32 pm-1:57 pm

1 stop17h 25m

$191

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Thu 2/19

10:49 am-5:42 pm

1 stop6h 53m

Lambert-St Louis

Sat 2/21

6:35 am-12:46 pm

1 stop6h 11m

$191

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Sat 2/14

6:00 am-11:02 am

1 stop5h 02m

Lambert-St Louis

Mon 2/23

3:47 pm-10:31 pm

1 stop6h 44m

$191

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/21

Showing 1-10 of 42 results
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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 December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust 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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Chicago-St. Louis flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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 December 19, 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 $77). Flying from Chicago to St. Louis in July is currently the most expensive (average of $172). 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 December 23, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 20% 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 December 20, 2025.

Travelers seeking maximum savings on their Chicago to St. Louis flight should consider departing on Wednesday evenings 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 December 23, 2025.

The most flights from CHI to STL are scheduled on a Monday (57 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (22 on average).

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

About 15% of weekly flights between Chicago and St. Louis have experienced delays in the past year, with the average delay time being 115 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 at night 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 11% 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
Airports
ORD

Avoid traffic delays by taking the 'L' train to ORD, a reliable option from downtown Chicago.

Read more about ORDBy Ramsey Qubein
MDW

Use the 'L' train for a quick, affordable trip to MDW, taking less than 30 minutes from the city center.

Read more about MDWBy Ramsey Qubein
STL

Take the MetroLink from STL for a convenient, affordable ride to downtown St. Louis in about 40 minutes.

Read more about STLBy Taryn White
Our travel experts
Ramsey Qubein

Ramsey Qubein

Expert on ORD and MDW

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 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 December 23, 2025.
See what other customers who have flown with Southwest, United Airlines, and American 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
4,256 reviews

Entertainment

7.5

Boarding

8.1

Food

7.0

Comfort

8.0

Crew

8.6

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Southwest
8.0
Very good
4,256 reviews
Southwest
8.0
Very good
4,256 reviews

Entertainment

7.5

Boarding

8.1

Food

7.0

Comfort

8.0

Crew

8.6

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
United Airlines
7.4
Good
9,109 reviews
Southwest
8.0
Very good
4,256 reviews

Entertainment

7.5

Boarding

8.1

Food

7.0

Comfort

8.0

Crew

8.6

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
American Airlines
7.2
Good
11,050 reviews
Southwest
8.0
Very good
4,256 reviews

Entertainment

7.5

Boarding

8.1

Food

7.0

Comfort

8.0

Crew

8.6

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Southern / Mokulele
6.8
Okay
30 reviews
Southwest
8.0
Very good
4,256 reviews

Entertainment

7.5

Boarding

8.1

Food

7.0

Comfort

8.0

Crew

8.6

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

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 42 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 United Airlines, Delta, and Southwest fly from Chicago to St. Louis in about 1h 33m. The time it takes to get you to your destination can typically vary by up to 4h 22m. 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 73% 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 $49 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 Envoy Air (81%), Turkish Airlines (79%) or Austrian Airlines (76%) 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 $78. On average you can expect to pay $341. The most popular route, (Chicago O'Hare Intl - Lambert-St Louis), can usually be booked for $141.

  • 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 July is currently the most expensive (average of $172). 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
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
Chesterfield
Alton
Farmington
Festus

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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 December 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$77Average$387FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$115Average$299FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$144Average$307FlexibilityNo cancel feeOn-time69%
Southern / MokuleleCheapest$145Average$213FlexibilityNo cancel feeOn-timeN/A

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