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

Airlines like Southwest, United Airlines, and Frontier fly from Chicago to St. Louis in about 1h 15m. The time it takes to get you to your destination can typically vary by up to 24h 37m. The distance from Chicago to St. Louis is about 251 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

Southwest, at $77, was found to be the cheapest airline from Chicago to St. Louis.Alternate airlines to your destination round-trip include American Airlines and Southern / Mokulele. These flights start at 74% lower than the current average price 3 months from now.

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

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 76 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 day to fly from Chicago to St. Louis?

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

The most flights from CHI to STL are scheduled on a Thursday (72 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (45 on average).

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.

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).

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

The cheapest flight price from Chicago to St. Louis is $48. On average you can expect to pay $279. The most popular route, (Chicago O'Hare Intl - Lambert-St Louis), can usually be booked for $97.

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 (81%), ANA (76%) or Envoy Air (73%) as they are the most reliable in getting you off to your destination on time.

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

Southern / Mokulele, American Airlines and United Airlines are the most popular airlines when flying from Chicago to St. Louis.

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

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

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.

$49+ Cheap Flights from Chicago to St. Louis

Round-trip from	$97 (Southwest)
One-way from	$49 (Southwest)
Popular in	July
Cheapest in	August
Average price	$346
Good round-trip deal	$207 or less
Good one-way deal	$110 or less

ORD

Avoid traffic delays by taking the 'L' train to ORD, a reliable option from downtown Chicago.

MDW

Use the 'L' train for a quick, affordable trip to MDW, taking less than 30 minutes from the city center.

STL

Take the MetroLink from STL for a convenient, affordable ride to downtown St. Louis in about 40 minutes.

Airline	Cheapest	Average	Flexibility	On-time
Southwest	Cheapest$77	Average$298	FlexibilityNo cancel fee	On-time63%
American Airlines	Cheapest$116	Average$288	FlexibilityNo cancel fee	On-time71%
Southern / Mokulele	Cheapest$118	Average$221	FlexibilityNo cancel fee	On-timeN/A
United Airlines	Cheapest$152	Average$320	FlexibilityNo cancel fee	On-time69%

$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 10/9. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Chicago to St. Louis with Cheapflights

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Cheapflights Tip: The best prices from Chicago to Lambert-St Louis are usually found in August or April, booked 78 days in advance, depart on a Thursday or Friday and return on a Thursday

Cheap flight deals from Chicago to St. Louis

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Cheapest flights from Chicago to St. LouisExplore 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 septiembre 19, 2025.

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 septiembre 19, 2025.

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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.

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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 September 12, 2025.

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

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 septiembre 19, 2025.

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 September 14, 2025.

Weekly flight availability from Chicago to St. Louis

Reviews of airlines servicing St. Louis

See what other customers who have flown with Southwest, United Airlines, and American Airlines from Chicago to St. Louis have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

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?

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

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

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

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

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

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

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

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

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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 septiembre 19, 2025.