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$56+ 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 3/1. Fares are subject to change and may not be available on all flights or dates of travel.
STL — CHI
Jan 22 — Jan 291
Wed 1/22
Wed 1/29
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 Tuesday or Thursday and return on a Saturday

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 January 17, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$120
(Frontier)

One-way from

$56
(Frontier)

Popular in

March

Cheapest in

May

Average price

$226
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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High demand for flights, 4% potential price rise
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Best time to find cheap flights, 2% potential price drop
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Average for round-trip flights in January 2025
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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 January 17, 2025.

This Mytrip deal was found by Cheapflights users on 1/16. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/612:15 pmSTL - ORD
1 stop3h 35mSouthern / Mokulele
Mon 2/108:20 pmORD - STL
1 stop15h 25mSouthern / Mokulele
Deal found 1/16$127
This Mytrip deal was found by Cheapflights users on 1/15. 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.
Fri 2/215:20 pmSTL - ORD
1 stop15h 55mFrontier
Mon 2/247:54 pmORD - STL
1 stop21h 42mFrontier
Deal found 1/15$128
This Frontier deal was found by Cheapflights users on 1/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/308:31 pmSTL - MDW
1 stop15h 13mFrontier
Mon 2/311:33 amMDW - STL
1 stop12h 08mFrontier
Deal found 1/16$130
This Mytrip deal was found by Cheapflights users on 1/16. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/55:05 pmSTL - ORD
1 stop16h 22mMultiple Airlines
Thu 2/68:20 pmORD - STL
1 stop15h 25mMultiple Airlines
Deal found 1/16$142
This Southwest deal was found by Cheapflights users on 1/14. 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.
Mon 2/245:00 pmSTL - MDW
Nonstop1h 10mSouthwest
Sat 3/19:10 pmMDW - STL
Nonstop1h 15mSouthwest
Deal found 1/14$157
This Delta deal was found by Cheapflights users on 1/14. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/16:00 amSTL - MDW
1 stop4h 42mDelta
Sat 3/85:05 pmMDW - STL
1 stop4h 44mDelta
Deal found 1/14$177
This American Airlines deal was found by Cheapflights users on 1/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/156:00 pmSTL - ORD
Nonstop1h 26mAmerican Airlines
Mon 2/178:45 pmORD - STL
Nonstop1h 18mAmerican Airlines
Deal found 1/16$217
This Mytrip deal was found by Cheapflights users on 1/16. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/43:48 pmSTL - ORD
2 stops20h 51mSpirit Airlines
Thu 2/65:11 amORD - STL
1 stop9h 32mSpirit Airlines
Deal found 1/16$229
This Delta deal was found by Cheapflights users on 1/16. 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.
Thu 2/611:04 amSTL - ORD
1 stop4h 41mDelta
Mon 2/104:58 pmORD - STL
2 stops6h 11mDelta
Deal found 1/16$242
This United Airlines deal was found by Cheapflights users on 1/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/133:32 pmSTL - ORD
Nonstop1h 22mUnited Airlines
Sun 2/169:15 amORD - STL
Nonstop1h 32mUnited Airlines
Deal found 1/16$257
This Southwest deal was found by Cheapflights users on 1/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/66:25 pmSTL - ORD
1 stop3h 55mSouthwest
Sun 2/96:15 amORD - STL
2 stops10h 40mSouthwest
Deal found 1/16$293

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 January 17, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

St. LouisChicago

STL - MDW

STLMDW

Lambert-St Louis

Thu 2/6

8:31 pm-11:44 am

1 stop15h 13m

Chicago Midway

Fri 2/7

3:37 pm-11:31 pm

1 stop7h 54m

$120

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Thu 2/6

12:15 pm-3:50 pm

1 stop3h 35m

Chicago O'Hare Intl

Mon 2/10

8:20 pm-11:45 am

1 stop15h 25m

$127

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Wed 1/29

5:05 pm-9:27 am

1 stop16h 22m

Chicago O'Hare Intl

Sun 2/2

4:18 pm-11:31 pm

1 stop7h 13m

$130

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Wed 2/5

5:05 pm-9:27 am

1 stop16h 22m

Chicago O'Hare Intl

Thu 2/6

8:20 pm-11:45 am

1 stop15h 25m

$142

St. LouisChicago

STL - MDW

STLMDW

Lambert-St Louis

Mon 2/24

5:00 pm-6:10 pm

Nonstop1h 10m

Chicago Midway

Mon 2/24

8:25 pm-9:40 pm

Nonstop1h 15m

$212

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Sat 2/15

6:00 pm-7:26 pm

Nonstop1h 26m

Chicago O'Hare Intl

Mon 2/17

8:45 pm-10:03 pm

Nonstop1h 18m

$217

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Tue 2/4

3:48 pm-12:39 pm

2 stops20h 51m

Chicago O'Hare Intl

Thu 2/6

5:11 am-2:43 pm

1 stop9h 32m

$229

St. LouisChicago

STL - MDW

STLMDW

Lambert-St Louis

Tue 2/11

4:40 pm-10:20 pm

1 stop5h 40m

Chicago Midway

Thu 2/13

10:19 am-2:50 pm

1 stop4h 31m

$237

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Thu 2/6

11:04 am-3:45 pm

1 stop4h 41m

Chicago O'Hare Intl

Mon 2/10

4:58 pm-11:09 pm

2 stops6h 11m

$242

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Thu 2/13

3:32 pm-4:54 pm

Nonstop1h 22m

Chicago O'Hare Intl

Sun 2/16

9:15 am-10:47 am

Nonstop1h 32m

$257

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/16

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 January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
MytripPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice 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 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 January 10, 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 $320). 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 January 17, 2025.

It’s optimal to fly from St. Louis to Chicago in the morning. By choosing this option you can save up to 14% on the cost of your flight, compared to a flight in the evening.

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 December 16, 2024.

Travelers seeking maximum savings on their St. Louis to Chicago flight should consider departing on Monday 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.

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 January 17, 2025.

The most flights from STL to CHI are scheduled on a Wednesday (57 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 January 17, 2025.
Peruse reviews from past customers who have flown with American Airlines, Frontier 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
4,659 reviews

Comfort

8.1

Entertainment

7.7

Boarding

8.2

Food

7.2

Overall

8.1

Crew

8.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Southwest
8.1
Very good
4,659 reviews
Southwest
8.1
Very good
4,659 reviews

Comfort

8.1

Entertainment

7.7

Boarding

8.2

Food

7.2

Overall

8.1

Crew

8.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Delta
8.0
Very good
8,511 reviews
Southwest
8.1
Very good
4,659 reviews

Comfort

8.1

Entertainment

7.7

Boarding

8.2

Food

7.2

Overall

8.1

Crew

8.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

United Airlines
7.4
Good
8,965 reviews
Southwest
8.1
Very good
4,659 reviews

Comfort

8.1

Entertainment

7.7

Boarding

8.2

Food

7.2

Overall

8.1

Crew

8.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,659 reviews

Comfort

8.1

Entertainment

7.7

Boarding

8.2

Food

7.2

Overall

8.1

Crew

8.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

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 48 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 $127, and Southwest, from $212. 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 Frontier, which is currently one of the cheapest options available, starting at $56. Southern / Mokulele flights start at $62 while deals on Spirit Airlines start at $84 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: Royal Jordanian (87%), Republic Airways (83%), Envoy Air (82%).

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

    The cheapest flight price from St. Louis to Chicago is $151. On average you can expect to pay $1,509. The most popular route, (Lambert-St Louis - Chicago O'Hare Intl), can usually be booked for $126.

  • 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 $320). 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 January 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$115Average$261FlexibilityNo cancel feeOn-time71%
Southern / MokuleleCheapest$118Average$183FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$118Average$299FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$168Average$284FlexibilityNo cancel feeOn-time63%
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