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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 8/5. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — STL
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
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Cheapflights Tip: The best prices from Chicago to Lambert-St Louis are usually found in September or June, booked 84 days in advance, depart on a Thursday or Wednesday 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 June 12, 2025.

Round-trip from

$107
(Southwest)

One-way from

$49
(Southwest)

Popular in

March

Cheapest in

September

Average price

$267

Good round-trip deal

$287 or less

Good one-way deal

$124 or less
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. 2% potential increase in price ($6 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 12, 2025.

This Southwest deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/72:35 pmMDW - STL
Nonstop1h 10mSouthwest
Mon 8/113:55 pmSTL - MDW
1 stop4h 55mSouthwest
Deal found 6/12$107
This Southwest deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/75:45 pmORD - STL
1 stop4h 50mSouthwest
Mon 8/117:15 amSTL - ORD
1 stop8h 05mSouthwest
Deal found 6/12$117
This American Airlines deal was found by Cheapflights users on 6/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/96:55 amORD - STL
Nonstop1h 25mAmerican Airlines
Mon 8/116:00 amSTL - ORD
Nonstop1h 24mAmerican Airlines
Deal found 6/11$124
This United Airlines deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/282:20 pmORD - STL
Nonstop1h 24mUnited Airlines
Mon 9/15:30 pmSTL - ORD
Nonstop1h 25mUnited Airlines
Deal found 6/12$157
This Jettzy deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Jettzy is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/278:15 amORD - STL
1 stop8h 30mSouthern / Mokulele
Sun 8/35:15 pmSTL - ORD
1 stop3h 37mSouthern / Mokulele
Deal found 6/12$165
This Delta deal was found by Cheapflights users on 6/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/209:30 amMDW - STL
1 stop3h 50mDelta
Sat 10/43:30 pmSTL - MDW
1 stop6h 14mDelta
Deal found 6/10$177
This Delta deal was found by Cheapflights users on 6/11. 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.
Thu 9/256:00 amORD - STL
1 stop6h 25mDelta
Tue 9/307:20 amSTL - ORD
1 stop6h 53mDelta
Deal found 6/11$177
This Frontier deal was found by Cheapflights users on 6/11. 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.
Sat 7/196:20 amMDW - STL
1 stop7h 39mFrontier
Sat 7/262:52 pmSTL - MDW
1 stop7h 43mFrontier
Deal found 6/11$199
This Trip.com deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/318:15 amORD - STL
1 stop3h 55mMultiple Airlines
Wed 8/610:00 amSTL - ORD
Nonstop1h 31mMultiple Airlines
Deal found 6/12$209
This Mytrip deal was found by Cheapflights users on 6/11. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/95:51 amORD - STL
2 stops28h 01mSpirit Airlines
Wed 7/1611:24 amSTL - ORD
1 stop9h 04mSpirit Airlines
Deal found 6/11$245
This Frontier deal was found by Cheapflights users on 6/9. 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.
Sat 7/125:01 amORD - STL
1 stop8h 58mFrontier
Sat 7/127:29 pmSTL - ORD
2 stops20h 14mFrontier
Deal found 6/9$320

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 June 12, 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

Thu 8/7

2:35 pm-3:45 pm

Nonstop1h 10m

Lambert-St Louis

Mon 8/11

3:55 pm-8:50 pm

1 stop4h 55m

$107

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 8/7

5:45 pm-10:35 pm

1 stop4h 50m

Lambert-St Louis

Mon 8/11

5:10 am-10:45 am

1 stop5h 35m

$117

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Sat 8/9

6:55 am-8:20 am

Nonstop1h 25m

Lambert-St Louis

Mon 8/11

6:00 am-7:24 am

Nonstop1h 24m

$124

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 8/28

2:20 pm-3:44 pm

Nonstop1h 24m

Lambert-St Louis

Mon 9/1

5:30 pm-6:55 pm

Nonstop1h 25m

$157

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Sun 7/27

8:15 am-4:45 pm

1 stop8h 30m

Lambert-St Louis

Sun 8/3

5:15 pm-8:52 pm

1 stop3h 37m

$165

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Sat 9/20

9:30 am-1:20 pm

1 stop3h 50m

Lambert-St Louis

Sat 10/4

3:30 pm-9:44 pm

1 stop6h 14m

$177

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 9/25

6:00 am-12:25 pm

1 stop6h 25m

Lambert-St Louis

Tue 9/30

1:30 pm-6:56 pm

1 stop5h 26m

$177

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Sat 7/19

6:20 am-1:59 pm

1 stop7h 39m

Lambert-St Louis

Sat 7/26

2:52 pm-10:35 pm

1 stop7h 43m

$199

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 7/31

8:15 am-12:10 pm

1 stop3h 55m

Lambert-St Louis

Wed 8/6

10:00 am-11:31 am

Nonstop1h 31m

$209

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Wed 7/9

5:51 am-9:52 am

2 stops28h 01m

Lambert-St Louis

Wed 7/16

11:24 am-8:28 pm

1 stop9h 04m

$245

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 23 results
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The best insider tips for Chicago to St. Louis flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Chicago to St. Louis trip
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

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 June 9, 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 June 12, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 34% 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 June 8, 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. 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 June 12, 2025.

The most flights from CHI to STL are scheduled on a Thursday (77 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (48 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 June 12, 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
4,287 reviews

Crew

8.6

Overall

8.0

Boarding

8.2

Comfort

8.0

Food

7.1

Entertainment

7.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Southwest
8.0
Very good
4,287 reviews
Southwest
8.0
Very good
4,287 reviews

Crew

8.6

Overall

8.0

Boarding

8.2

Comfort

8.0

Food

7.1

Entertainment

7.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Delta
8.0
Very good
7,946 reviews
Southwest
8.0
Very good
4,287 reviews

Crew

8.6

Overall

8.0

Boarding

8.2

Comfort

8.0

Food

7.1

Entertainment

7.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
United Airlines
7.4
Good
8,790 reviews
Southwest
8.0
Very good
4,287 reviews

Crew

8.6

Overall

8.0

Boarding

8.2

Comfort

8.0

Food

7.1

Entertainment

7.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,287 reviews

Crew

8.6

Overall

8.0

Boarding

8.2

Comfort

8.0

Food

7.1

Entertainment

7.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

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 64 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 $107, 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 63% 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 American Airlines from $49 and United Airlines from $62 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 SkyWest Airlines (89%), Republic Airways (87%) or United Airlines (85%) 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 $108. On average you can expect to pay $305. 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
O'Fallon
Maryland Heights
Fairview Heights
Collinsville
Eureka
St. Peters
Glencoe
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Alton
Farmington

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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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$116Average$275FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$116Average$328FlexibilityNo cancel feeOn-time63%
Southern / MokuleleCheapest$117Average$198FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$149Average$320FlexibilityNo cancel feeOn-time69%

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