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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 6/9. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — STL
avr. 21 — avr. 281
lun. 4/21
lun. 4/28
1 adult, Economy
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Cheapflights Tip: The best prices from Chicago to Lambert-St Louis are usually found in May or September, 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 avril 16, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$97
(Southwest)

One-way from

$49
(Southwest)

Popular in

March

Cheapest in

May

Average price

$269

Good round-trip deal

$228 or less

Good one-way deal

$130 or less
Provider with most accurate pricing for Chicago (CHI)-Lambert-St Louis flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-Lambert-St Louis flights.
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From Chicago (CHI) to Lambert-St Louis
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One-way flight from Chicago (CHI) to Lambert-St Louis
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Highest demand for flights based on searches. 4% potential increase in price ($12 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in April 2025
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Price to beat on a round-trip flight from Chicago (CHI) to Lambert-St Louis.
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Price to beat on a one-way flight from Chicago (CHI) to Lambert-St Louis.
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Find 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 avril 16, 2025.

This Southwest deal was found by Cheapflights users on 4/15. 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.
jeu. 5/86:20 amMDW - STL
Nonstop1h 10mSouthwest
lun. 5/128:55 pmSTL - MDW
Nonstop1h 05mSouthwest
Deal found 4/15$97
This United Airlines deal was found by Cheapflights users on 4/15. 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.
mar. 5/131:20 pmORD - STL
Nonstop1h 27mUnited Airlines
mar. 5/206:30 amSTL - ORD
Nonstop1h 30mUnited Airlines
Deal found 4/15$97
This American Airlines deal was found by Cheapflights users on 4/15. 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.
jeu. 5/810:30 pmORD - STL
Nonstop1h 21mAmerican Airlines
lun. 5/125:00 amSTL - ORD
Nonstop1h 19mAmerican Airlines
Deal found 4/15$98
This Ticket deal was found by Cheapflights users on 4/15. 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 Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 5/88:20 pmORD - STL
1 stop15h 25mSouthern / Mokulele
lun. 5/1212:15 pmSTL - ORD
1 stop3h 35mSouthern / Mokulele
Deal found 4/15$122
This Delta deal was found by Cheapflights users on 4/16. 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.
mar. 5/139:20 amMDW - STL
1 stop5h 40mDelta
mer. 5/287:05 amSTL - MDW
1 stop4h 48mDelta
Deal found 4/16$177
This Delta deal was found by Cheapflights users on 4/16. 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.
jeu. 5/87:05 amORD - STL
1 stop4h 59mDelta
mar. 5/135:40 pmSTL - ORD
1 stop6h 18mDelta
Deal found 4/16$177
This Frontier deal was found by Cheapflights users on 4/15. 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.
mar. 4/154:40 pmMDW - STL
1 stop7h 06mFrontier
ven. 4/186:38 pmSTL - MDW
1 stop10h 45mFrontier
Deal found 4/15$191
This CheapOair deal was found by Cheapflights users on 4/15. 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.
dim. 4/274:30 pmORD - STL
1 stop7h 34mMultiple Airlines
mer. 4/309:20 amSTL - ORD
1 stop22h 17mMultiple Airlines
Deal found 4/15$213
This Booking.com deal was found by Cheapflights users on 4/15. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven. 6/65:08 pmORD - STL
1 stop6h 29mFrontier
dim. 6/85:35 pmSTL - ORD
1 stop6h 35mFrontier
Deal found 4/15$230
This Southwest deal was found by Cheapflights users on 4/14. 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.
ven. 5/167:30 amORD - STL
2 stops11h 00mSouthwest
lun. 5/197:30 amSTL - ORD
1 stop7h 30mSouthwest
Deal found 4/14$312
This Mytrip deal was found by Cheapflights users on 4/15. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven. 5/164:35 pmORD - STL
2 stops16h 40mSpirit Airlines
jeu. 5/2210:10 amSTL - ORD
3 stops13h 19mSpirit Airlines
Deal found 4/15$332

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 avril 16, 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

MDW - STL

MDWSTL

Chicago Midway

jeu. 5/8

6:20 am-7:30 am

Nonstop1h 10m

Lambert-St Louis

lun. 5/12

8:55 pm-10:00 pm

Nonstop1h 05m

$97

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

mar. 5/13

1:20 pm-2:47 pm

Nonstop1h 27m

Lambert-St Louis

mer. 5/28

6:30 am-8:02 am

Nonstop1h 32m

$97

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

jeu. 5/8

10:30 pm-11:51 pm

Nonstop1h 21m

Lambert-St Louis

lun. 5/12

5:00 am-6:19 am

Nonstop1h 19m

$98

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

jeu. 5/8

8:20 pm-11:45 am

1 stop15h 25m

Lambert-St Louis

lun. 5/12

12:15 pm-3:50 pm

1 stop3h 35m

$122

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

mar. 5/13

9:20 am-3:00 pm

1 stop5h 40m

Lambert-St Louis

mer. 5/28

7:05 am-11:53 am

1 stop4h 48m

$177

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

jeu. 5/8

7:05 am-12:04 pm

1 stop4h 59m

Lambert-St Louis

mar. 5/13

5:40 pm-11:58 pm

1 stop6h 18m

$177

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

lun. 4/28

1:26 pm-12:04 am

1 stop10h 38m

Lambert-St Louis

mer. 4/30

5:41 pm-12:24 pm

1 stop18h 43m

$191

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

dim. 4/27

4:30 pm-12:04 am

1 stop7h 34m

Lambert-St Louis

mer. 4/30

9:20 am-7:37 am

1 stop22h 17m

$213

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

mer. 5/14

1:50 pm-8:00 pm

2 stops6h 10m

Lambert-St Louis

jeu. 5/15

2:20 pm-9:30 pm

1 stop7h 10m

$225

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

ven. 6/6

5:08 pm-11:37 pm

1 stop6h 29m

Lambert-St Louis

dim. 6/8

5:35 pm-12:10 am

1 stop6h 35m

$230

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/16

Showing 1-10 of 23 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 April.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust 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 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 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 April 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 avril 16, 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 March 30, 2025.

Travelers seeking maximum savings on their Chicago to St. Louis flight should consider departing on Saturday evenings when fares are most often at their lowest. Monday mornings 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 avril 16, 2025.

The most flights from CHI to STL are scheduled on a Tuesday (66 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (40 on average).

Rainfall in St. Louis by month

Plan your trip to St. Louis by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

Temperature in St. Louis by month

Plan your trip to St. Louis by taking into account the average temperature totals by month.

If weather is an important factor for your trip to St. Louis, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

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 avril 16, 2025.
To help decide which airline to fly from Chicago to St. Louis, see what other customers have to say about Southwest, Delta and United Airlines. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,282 reviews

Entertainment

7.6

Overall

8.0

Food

7.1

Boarding

8.2

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Southwest
8.0
Very good
4,282 reviews
Southwest
8.0
Very good
4,282 reviews

Entertainment

7.6

Overall

8.0

Food

7.1

Boarding

8.2

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Delta
8.0
Very good
7,916 reviews
Southwest
8.0
Very good
4,282 reviews

Entertainment

7.6

Overall

8.0

Food

7.1

Boarding

8.2

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
United Airlines
7.4
Good
8,665 reviews
Southwest
8.0
Very good
4,282 reviews

Entertainment

7.6

Overall

8.0

Food

7.1

Boarding

8.2

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,282 reviews

Entertainment

7.6

Overall

8.0

Food

7.1

Boarding

8.2

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

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 56 flights from Chicago to Lambert-St Louis per day from 4 different airlines.

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

    Southwest, at $97, was found to be the cheapest airline from Chicago to St. Louis.Alternate airlines to your destination round-trip include United Airlines and American Airlines. These flights start at 66% 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 $49 on Southwest. Other airlines that offer cheap prices include United Airlines from $49 and Southern / Mokulele from $73 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 (84%), Turkish Airlines (83%) or Alaska Airlines (82%) 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 $63. On average you can expect to pay $371. The most popular route, (Chicago O'Hare Intl - Lambert-St Louis), can usually be booked for $97.

  • 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 $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.

See more FAQs

Traveling to a place near Chicago?

Book flights to Chicago if you plan to visit one of these locations
Fenton
Maryland Heights
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Collinsville
Wentzville
Eureka
St. Peters
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Alton
Farmington
Chesterfield

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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 avril 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$115Average$283FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$116Average$328FlexibilityNo cancel feeOn-time63%
Southern / MokuleleCheapest$117Average$175FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$142Average$319FlexibilityNo cancel feeOn-time69%

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