How long is the flight from St. Louis to Chicago?

Departing from St. Louis to Chicago will take you 1h 10m. The distance between St. Louis and Chicago is about 251 mi. Most flights are nonstop.

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 $119. Other airlines that can offer you cheap pricing are Southern / Mokulele, from $140, and United Airlines, from $149. These flights start at 52% lower than the current average price 3 months from now.

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

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 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 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 day to fly from St. Louis to Chicago?

Travelers seeking maximum savings on their St. Louis to Chicago flight should consider departing on Thursday mornings when fares are most often at their lowest. Saturday 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

The most flights from STL to CHI are scheduled on a Thursday (74 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (55 on average).

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.

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).

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

The cheapest flight price from St. Louis to Chicago is $99. On average you can expect to pay $916. The most popular route, (Lambert-St Louis - Chicago O'Hare Intl), can usually be booked for $101.

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: Qatar Airways (80%), Avianca (80%), Japan Airlines (78%).

What are the most popular airlines that fly from St. Louis to Chicago?

The most popular airlines flying from St. Louis to Chicago are Southern / Mokulele, American Airlines and United Airlines. Something to consider prior to booking your flight.

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

Leaving on a Wednesday is a viable option for saving on travel. Heavily demanded days of the week can typically drive up the prices you see. Booking your travel for a less competitive day can save up to 32% on the overall cost on flights from St. Louis to Chicago.

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

Users have found that booking a flight from St. Louis to Chicago at least 52 days early can save you up to 99% on average compared to booking a flight this week. If booking 52 days before your flight isn’t an option for you, users have found flights from St. Louis to Chicago for as little as $125 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as $276 for flights departing within the next 3 days.

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

Due to multiple factors, expect to potentially pay more when booking in April. For low rates, August can be a great choice for travel to Chicago. Flights to Chicago from St. Louis in August are about $252 on average during August, but can be found for as low as $91.

What is the cheapest time of day to fly from STL to CHI?

It’s optimal to fly from St. Louis to Chicago in the morning. By choosing this option you can save up to 50% on the cost of your flight, compared to a flight at noon.

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

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.

$51+ Flights from St. Louis to Chicago

Round-trip from	$101 (Southwest)
One-way from	$51 (Southwest)
Popular in	April
Cheapest in	August
Average price	$221
Good round-trip deal	$264 or less
Good one-way deal	$180 or less

STL

Expect security screening at STL to take 5-10 minutes during off-peak times. Check real-time wait times online before heading to the airport.

ORD

At ORD, expect long walks between terminals. Use the free shuttle train for easier navigation between terminals.

MDW

The Orange Line train connects MDW to downtown Chicago in under 30 minutes, offering a convenient and affordable transportation option.

Airline	Cheapest	Average	Flexibility	On-time
American Airlines	Cheapest$119	Average$278	FlexibilityNo cancel fee	On-time71%
Southern / Mokulele	Cheapest$140	Average$213	FlexibilityNo cancel fee	On-timeN/A
United Airlines	Cheapest$149	Average$315	FlexibilityNo cancel fee	On-time69%
Southwest	Cheapest$151	Average$291	FlexibilityNo cancel fee	On-time63%

$51+ 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 10/18. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from St. Louis to Chicago with Cheapflights

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Cheapflights Tip: The best prices from Lambert-St Louis to Chicago are usually found in August or September, booked 85 days in advance, depart on a Thursday or Friday and return on a Thursday

Cheap flight deals from St. Louis to Chicago

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Cheapest flights from St. Louis to ChicagoExplore 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 September 11, 2025.

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 September 11, 2025.

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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.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Chicago

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 August 29, 2025.

What is the cheapest month to book a flight from St. Louis to Chicago?

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 September 11, 2025.

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 September 7, 2025.

Weekly flight availability from St. Louis to Chicago

Reviews of airlines servicing Chicago

Read through reviews of airlines operating flights from St. Louis to Chicago, such as Southwest, United Airlines, and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

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?

How long is the flight from St. Louis to Chicago?

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

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

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

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

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

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

What is the cheapest month to book a flight from St. Louis to Chicago?

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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 September 11, 2025.