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$59+ Cheap flights from St. Louis (STL) to Chicago (CHI)

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 3/26. Fares are subject to change and may not be available on all flights or dates of travel.
STL — CHI
Feb 25 — Mar 41
Tue 2/25
Tue 3/4
1 adult, Economy
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The best prices from Lambert-St Louis to Chicago are usually found in May or August, booked 77 days in advance, depart on a Friday or Thursday and return on a Thursday

Cheap flight deals from St. Louis to Chicago

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Chicago (CHI). 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 February 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$120
(American Airlines)

One-way from

$59
(Southwest)

Popular in

November

Cheapest in

May

Average price

$245

Good round-trip deal

$347 or less

Good one-way deal

$147 or less
Provider with most accurate pricing for Lambert-St Louis-Chicago (CHI) flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-Chicago (CHI) flights.
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From Lambert-St Louis to Chicago (CHI)
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One-way flight from Lambert-St Louis to Chicago (CHI)
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Highest demand for flights based on searches. 11% potential increase in price ($29 potential increase over avg. RT price).
Search Deals
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 February 2025
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Price to beat on a round-trip flight from Lambert-St Louis to Chicago (CHI).
Search Deals
Price to beat on a one-way flight from Lambert-St Louis to Chicago (CHI).
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Find flight deals from St. Louis to Chicago

Cheapest flights from St. Louis to Chicago
Explore the most affordable flight options available from St. Louis to Chicago. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 20, 2025.

This American Airlines deal was found by Cheapflights users on 2/20. 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.
Tue 5/136:00 amSTL - ORD
Nonstop1h 23mAmerican Airlines
Thu 5/1510:21 pmORD - STL
Nonstop1h 20mAmerican Airlines
Deal found 2/20$120
This eDestinos deal was found by Cheapflights users on 2/20. 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 5/1312:15 pmSTL - ORD
1 stop3h 35mSouthern / Mokulele
Thu 5/158:25 amORD - STL
1 stop11h 45mSouthern / Mokulele
Deal found 2/20$123
This Southwest deal was found by Cheapflights users on 2/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/64:00 pmSTL - MDW
1 stop6h 05mSouthwest
Mon 3/104:25 pmMDW - STL
Nonstop1h 15mSouthwest
Deal found 2/20$127
This Kiwi.com deal was found by Cheapflights users on 2/20. 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.
Fri 3/1411:00 amSTL - ORD
Nonstop1h 17mMultiple Airlines
Mon 3/178:25 amORD - STL
1 stop11h 45mMultiple Airlines
Deal found 2/20$127
This Frontier deal was found by Cheapflights users on 2/20. 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 3/246:55 pmSTL - MDW
1 stop10h 36mFrontier
Mon 4/141:23 pmMDW - STL
1 stop10h 23mFrontier
Deal found 2/20$130
This Southwest deal was found by Cheapflights users on 2/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/135:20 amSTL - ORD
2 stops8h 40mSouthwest
Thu 5/155:45 pmORD - STL
1 stop5h 00mSouthwest
Deal found 2/20$142
This United Airlines deal was found by Cheapflights users on 2/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/186:30 amSTL - ORD
Nonstop1h 31mUnited Airlines
Thu 3/201:01 pmORD - STL
Nonstop1h 22mUnited Airlines
Deal found 2/20$163
This Delta deal was found by Cheapflights users on 2/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/186:50 amSTL - MDW
1 stop5h 46mDelta
Fri 4/117:09 pmMDW - STL
1 stop3h 55mDelta
Deal found 2/20$177
This Delta deal was found by Cheapflights users on 2/19. 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.
Fri 4/410:30 amSTL - ORD
1 stop5h 41mDelta
Sat 4/196:45 amORD - STL
2 stops10h 01mDelta
Deal found 2/19$182
This Mytrip deal was found by Cheapflights users on 2/19. 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.
Tue 5/137:37 pmSTL - ORD
2 stops26h 51mSpirit Airlines
Fri 5/166:34 pmORD - STL
1 stop23h 58mSpirit Airlines
Deal found 2/19$218

Find flights from St. Louis to Chicago within your budget

Customize your flight search to find flights from St. Louis to Chicago 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 February 20, 2025.

Fly from

St. Louis

Fly to

Chicago

Route

Depart

Return

Price

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Tue 5/13

6:00 am-7:23 am

Nonstop1h 23m

Chicago O'Hare Intl

Thu 5/15

10:21 pm-11:41 pm

Nonstop1h 20m

$120

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Tue 5/13

12:15 pm-3:50 pm

1 stop3h 35m

Chicago O'Hare Intl

Thu 5/15

8:25 am-8:10 pm

1 stop11h 45m

$123

St. LouisChicago

STL - MDW

STLMDW

Lambert-St Louis

Thu 3/6

4:00 pm-10:05 pm

1 stop6h 05m

Chicago Midway

Mon 3/10

4:25 pm-5:40 pm

Nonstop1h 15m

$127

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Fri 3/14

11:00 am-12:17 pm

Nonstop1h 17m

Chicago O'Hare Intl

Mon 3/17

8:25 am-8:10 pm

1 stop11h 45m

$127

St. LouisChicago

STL - MDW

STLMDW

Lambert-St Louis

Mon 3/24

6:55 pm-5:31 am

1 stop10h 36m

Chicago Midway

Mon 4/14

1:23 pm-11:46 pm

1 stop10h 23m

$130

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Tue 5/13

5:20 am-2:00 pm

2 stops8h 40m

Chicago O'Hare Intl

Thu 5/15

5:45 pm-10:45 pm

1 stop5h 00m

$142

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Tue 3/18

6:30 am-8:01 am

Nonstop1h 31m

Chicago O'Hare Intl

Thu 3/20

1:01 pm-2:23 pm

Nonstop1h 22m

$163

St. LouisChicago

STL - MDW

STLMDW

Lambert-St Louis

Tue 3/18

6:50 am-12:36 pm

1 stop5h 46m

Chicago Midway

Fri 4/11

7:09 pm-11:04 pm

1 stop3h 55m

$177

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Fri 4/4

10:30 am-4:11 pm

1 stop5h 41m

Chicago O'Hare Intl

Sat 4/19

6:45 am-4:46 pm

2 stops10h 01m

$182

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Tue 5/13

7:37 pm-10:28 pm

2 stops26h 51m

Chicago O'Hare Intl

Fri 5/16

6:34 pm-6:32 pm

1 stop23h 58m

$218

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/20

Showing 1-10 of 22 results
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Compare providers for flights from St. Louis to Chicago

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 St. Louis to Chicago in February.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
MytripPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust 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 St. Louis-Chicago flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Chicago flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Chicago flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-Chicago 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 St. Louis-Chicago 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 St. Louis to Chicago

Have a flexible travel schedule? Discover the best time to fly to Chicago from St. Louis 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.

Travel insights for flights from St. Louis to Chicago

Get recent, data-driven insights about flights from St. Louis to Chicago including ideal travel times, pricing trends, and more.

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

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Chicago. Price data was last updated on February 14, 2025.

The price you pay for your flight from St. Louis to Chicago may vary depending on when you book. For the best chance of a lower fare, look to book 77 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 St. Louis to Chicago?

Currently, August is the cheapest month in which you can book a flight from St. Louis to Chicago (average of $245). Flying from St. Louis to Chicago in March is currently the most expensive (average of $321). 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 STL to CHI?

Find hourly flight availability from St. Louis to Chicago. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated February 20, 2025.

It’s optimal to fly from St. Louis to Chicago in the evening. By choosing this option you can save up to 63% on the cost of your flight, compared to a flight at noon.

What is the cheapest day to fly from St. Louis to Chicago?

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Chicago. Price data was last updated on February 16, 2025.

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

Weekly flight availability from St. Louis to Chicago

Explore weekly flight availability from St. Louis to Chicago. 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 February 20, 2025.

The most flights from STL to CHI are scheduled on a Thursday (62 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (31 on average).

Rainfall in Chicago by month

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

In terms of precipitation, rainfall in Chicago ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Chicago when rainfall is around 1.7 in.

Temperature in Chicago by month

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

If weather is an important factor for your trip to Chicago, 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 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

Reviews of airlines servicing Chicago

Get insights into the airlines that provide service to Chicago. 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 Chicago. Reviews last updated February 20, 2025.
Peruse reviews from past customers who have flown with Southwest, Delta and United Airlines from St. Louis to Chicago to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,411 reviews

Comfort

8.1

Food

7.1

Entertainment

7.6

Overall

8.1

Crew

8.7

Boarding

8.2

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
8.1
Very good
4,411 reviews
Southwest
8.1
Very good
4,411 reviews

Comfort

8.1

Food

7.1

Entertainment

7.6

Overall

8.1

Crew

8.7

Boarding

8.2

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.

Delta
8.0
Very good
8,220 reviews
Southwest
8.1
Very good
4,411 reviews

Comfort

8.1

Food

7.1

Entertainment

7.6

Overall

8.1

Crew

8.7

Boarding

8.2

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
8,766 reviews
Southwest
8.1
Very good
4,411 reviews

Comfort

8.1

Food

7.1

Entertainment

7.6

Overall

8.1

Crew

8.7

Boarding

8.2

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
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,411 reviews

Comfort

8.1

Food

7.1

Entertainment

7.6

Overall

8.1

Crew

8.7

Boarding

8.2

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 St. Louis to Chicago. 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 from for flights from St. Louis to Chicago?

    If you book a flight to Chicago from St. Louis, you will be flying from Lambert-St Louis, which is the city’s only airport. Lambert-St Louis (STL) is located 12.7 mi from the center of St. Louis. There are 51 flights from Lambert-St Louis to Chicago per day from 4 different airlines.

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

    Cheapflights users have booked flights from St. Louis to Chicago round-trip from $120. Other airlines that can offer you cheap pricing are Southern / Mokulele, from $123, and Southwest, from $127. These flights start at 48% lower than the current average price 3 months from now.

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

    To fly one-way, consider booking your trip with Southwest, which is currently one of the cheapest options available, starting at $59. American Airlines flights start at $59 while deals on Frontier start at $62 one-way.

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

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from St. Louis to Chicago on time: Republic Airways (96%), Royal Jordanian (94%), ANA (86%).

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

    The cheapest flight price from St. Louis to Chicago is $125. On average you can expect to pay $1,381. The most popular route, (Lambert-St Louis - Chicago O'Hare Intl), can usually be booked for $122.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from St. Louis to Chicago (average of $245). Flying from St. Louis to Chicago in March is currently the most expensive (average of $321). 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
Merrillville
New Buffalo
Hammond
Benton Harbor
Porter
Lansing
Valparaiso
Chesterton

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Top 4 airlines flying from St. Louis to Chicago

Discover the top 4 airlines that operate flights from St. Louis to Chicago. 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 February 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$115Average$264FlexibilityNo cancel feeOn-time71%
Southern / MokuleleCheapest$118Average$181FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$120Average$295FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$168Average$280FlexibilityNo cancel feeOn-time63%
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