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

Airlines like Southwest, Frontier, and Delta fly from Illinois to St. Louis in about 1h 10m. The time it takes to get you to your destination can typically vary by up to 8h 36m. There are 251 mi between Illinois and St. Louis. Both multi-stop and nonstop flights can be found to your destination and back.

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 most popular routes from Illinois to St. Louis?

When deciding which route to take from Illinois to St. Louis consider Chicago O'Hare Intl - Lambert-St Louis, Chicago Midway - Lambert-St Louis or Springfield Capital - Lambert-St Louis as they are the most popular.

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

Looking at all options, your cheapest flight can be booked for $48. While the most popular route (Chicago O'Hare Intl - Lambert-St Louis) can be booked for $137 on average, our data indicates $279 when flying from Illinois to St. Louis.

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

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 Illinois to St. Louis on time: SkyWest Airlines (81%), ANA (76%), Envoy Air (73%).

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

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

What airport do you fly into for flights to St. Louis from Illinois?

If you book a flight to St. Louis from Illinois, 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.

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

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

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

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

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

Yes. Cheapflights offers flight deals from Illinois 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.

$68+ Cheap Flights from Illinois to St. Louis

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Cheap flight deals from Illinois to St. Louis

Round-trip from	$137 (Southwest)
One-way from	$68 (American Airlines)
Popular in	July
Cheapest in	August
Average price	$352
Good round-trip deal	$61 or less
Good one-way deal	$98 or less

From Illinois to Lambert-St Louis

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One-way flight from Illinois to Lambert-St Louis

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High demand for flights, 0% potential price rise

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Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).

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Average for round-trip flights in September 2025

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Price to beat on a round-trip flight from Illinois to Lambert-St Louis.

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Price to beat on a one-way flight from Illinois to Lambert-St Louis.

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Find flight deals from Illinois to St. Louis

Cheapest flights from Illinois to St. Louis
Explore the most affordable flight options available from Illinois to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 22, 2025.

Thu 10/167:40 amMDW - STL

Nonstop1h 10mSouthwest

Mon 10/205:40 amSTL - MDW

Nonstop1h 10mSouthwest

Deal found 9/21

$137

Thu 10/162:20 pmORD - STL

Nonstop1h 24mUnited Airlines

Mon 10/205:28 pmSTL - ORD

Nonstop1h 25mUnited Airlines

Deal found 9/21

$137

Wed 11/511:40 amORD - STL

Nonstop1h 25mAmerican Airlines

Wed 11/125:40 pmSTL - ORD

Nonstop1h 40mAmerican Airlines

Deal found 9/20

$138

Thu 11/65:01 amORD - STL

1 stop5h 11mFrontier

Mon 11/1012:09 pmSTL - ORD

1 stop12h 34mFrontier

Deal found 9/20

$144

Fri 11/146:15 amMDW - STL

1 stop9h 46mFrontier

Sun 11/1611:17 amSTL - MDW

1 stop10h 46mFrontier

Deal found 9/20

$150

Wed 11/1212:37 pmORD - STL

1 stop21h 35mFrontier

Fri 11/144:56 pmSTL - ORD

1 stop7h 15mFrontier

Deal found 9/20

$150

Thu 11/135:11 amORD - STL

1 stop5h 01mFrontier

Sun 11/1611:17 amSTL - ORD

1 stop12h 54mFrontier

Deal found 9/20

$153

Wed 10/226:53 pmORD - STL

Nonstop1h 33mAmerican Airlines

Sat 10/254:34 pmSTL - ORD

Nonstop1h 28mAmerican Airlines

Deal found 9/20

$154

Fri 10/34:48 pmMDW - STL

1 stop16h 18mFrontier

Mon 10/64:00 pmSTL - MDW

1 stop7h 41mFrontier

Deal found 9/20

$156

Sun 9/288:49 pmORD - STL

1 stop16h 13mFrontier

Mon 9/294:00 pmSTL - ORD

1 stop8h 10mFrontier

Deal found 9/20

$156

Wed 10/2211:00 amORD - STL

1 stop23h 37mFrontier

Sat 10/257:52 pmSTL - ORD

1 stop13h 44mFrontier

Deal found 9/20

$157

Sat 10/255:20 pmMDW - STL

1 stop16h 02mFrontier

Mon 10/2710:18 amSTL - MDW

1 stop13h 02mFrontier

Deal found 9/21

$159

Best flights from Illinois to St. Louis
Discover carefully curated flight deals from Illinois to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 22, 2025.

Thu 10/167:40 amMDW - STL

Nonstop1h 10mSouthwest

Mon 10/206:30 pmSTL - MDW

Nonstop1h 10mSouthwest

Deal found 9/21

$137

Fri 11/146:15 amMDW - STL

1 stop9h 46mFrontier

Sun 11/1611:17 amSTL - MDW

1 stop10h 46mFrontier

Deal found 9/19

$150

Wed 10/221:10 pmORD - STL

1 stop3h 25mMultiple Airlines

Fri 10/2411:11 amSTL - ORD

1 stop6h 36mMultiple Airlines

Deal found 9/22

$170

Tue 10/145:20 amORD - STL

1 stop5h 06mDelta

Tue 10/145:15 pmSTL - ORD

1 stop6h 43mDelta

Deal found 9/20

$177

Wed 10/158:15 amORD - STL

1 stop8h 20mSouthern / Mokulele

Thu 10/169:20 amSTL - ORD

1 stop22h 04mSouthern / Mokulele

Deal found 9/21

$185

Thu 10/307:40 amMDW - STL

Nonstop1h 10mSouthwest

Wed 11/51:50 pmSTL - MDW

Nonstop1h 05mSouthwest

Deal found 9/20

$137

Fri 10/34:48 pmMDW - STL

1 stop16h 18mFrontier

Mon 10/64:00 pmSTL - MDW

1 stop7h 41mFrontier

Deal found 9/20

$156

Tue 10/146:15 amMDW - STL

1 stop5h 30mSouthwest

Tue 10/142:45 pmSTL - MDW

1 stop4h 55mSouthwest

Deal found 9/20

$157

Thu 10/1611:01 amORD - STL

Nonstop1h 27mMultiple Airlines

Mon 10/201:00 pmSTL - ORD

1 stop3h 19mMultiple Airlines

Deal found 9/20

$177

Mon 10/275:51 pmORD - STL

1 stop5h 50mDelta

Tue 10/286:40 amSTL - ORD

1 stop6h 00mDelta

Deal found 9/21

$177

Fri 10/241:10 pmORD - STL

1 stop3h 25mSouthern / Mokulele

Sun 10/261:00 pmSTL - ORD

1 stop7h 39mSouthern / Mokulele

Deal found 9/20

$185

Thu 10/165:20 amORD - STL

1 stop5h 06mDelta

Mon 10/203:59 pmSTL - ORD

1 stop5h 25mDelta

Deal found 9/21

$177

Thu 10/3012:40 pmORD - STL

1 stop10h 05mSouthwest

Wed 11/58:25 amSTL - ORD

1 stop3h 50mSouthwest

Deal found 9/20

$162

Sat 10/251:10 pmORD - STL

1 stop22h 50mSouthern / Mokulele

Sun 10/265:15 pmSTL - ORD

1 stop19h 04mSouthern / Mokulele

Deal found 9/21

$185

Thu 10/91:42 pmSPI - STL

1 stop50h 22mAmerican Airlines

Fri 10/178:05 pmSTL - SPI

1 stop17h 07mAmerican Airlines

Deal found 9/20

$817

Sun 10/51:14 pmSPI - STL

1 stop31h 12mAmerican Airlines

Thu 10/98:05 pmSTL - SPI

1 stop41h 07mAmerican Airlines

Deal found 9/20

$896

Last-minute flights from Illinois to St. Louis
Discover last-minute flight deals from Illinois to St. Louis. Data last updated September 22, 2025 and is based on user searches.

Sun 9/288:49 pmORD - STL

1 stop16h 13mFrontier

Mon 9/294:00 pmSTL - ORD

1 stop8h 10mFrontier

Deal found 9/20

$156

Tue 9/307:20 amORD - STL

1 stop25h 46mFrontier

Tue 10/77:52 pmSTL - ORD

1 stop28h 01mFrontier

Deal found 9/21

$164

Fri 10/34:48 pmMDW - STL

1 stop16h 18mFrontier

Mon 10/64:00 pmSTL - MDW

1 stop7h 41mFrontier

Deal found 9/20

$156

Thu 10/167:40 amMDW - STL

Nonstop1h 10mSouthwest

Mon 10/206:30 pmSTL - MDW

Nonstop1h 10mSouthwest

Deal found 9/21

$137

Thu 10/162:20 pmORD - STL

Nonstop1h 24mUnited Airlines

Mon 10/205:28 pmSTL - ORD

Nonstop1h 25mUnited Airlines

Deal found 9/21

$137

Tue 10/211:10 pmORD - STL

1 stop3h 25mSouthern / Mokulele

Mon 10/271:00 pmSTL - ORD

1 stop3h 19mSouthern / Mokulele

Deal found 9/20

$168

Tue 10/218:15 amORD - STL

1 stop3h 45mMultiple Airlines

Fri 10/2411:11 amSTL - ORD

1 stop6h 36mMultiple Airlines

Deal found 9/21

$170

Wed 10/226:53 pmORD - STL

Nonstop1h 33mAmerican Airlines

Sat 10/254:34 pmSTL - ORD

Nonstop1h 28mAmerican Airlines

Deal found 9/20

$154

Wed 10/2211:00 amORD - STL

1 stop23h 37mFrontier

Sat 10/257:52 pmSTL - ORD

1 stop13h 44mFrontier

Deal found 9/20

$157

Sat 10/255:20 pmMDW - STL

1 stop16h 02mFrontier

Mon 10/2710:18 amSTL - MDW

1 stop13h 02mFrontier

Deal found 9/21

$159

Sat 10/2512:05 pmORD - STL

1 stop21h 17mFrontier

Mon 10/2710:18 amSTL - ORD

1 stop15h 13mFrontier

Deal found 9/21

$159

Thu 10/3012:40 pmORD - STL

1 stop10h 05mSouthwest

Wed 11/58:25 amSTL - ORD

1 stop3h 50mSouthwest

Deal found 9/20

$162

One-way flights from Illinois to St. Louis
Search for one-way flight options from Illinois to St. Louis. Find affordable one-way fares based on user searches. Data last updated September 22, 2025.

Mon 10/276:53 pmORD - STL

Nonstop1h 33mAmerican Airlines

Deal found 9/20

$68

Tue 12/2310:50 pmMDW - STL

Nonstop1h 15mSouthwest

Deal found 9/20

$69

Thu 12/1110:50 amORD - STL

Nonstop1h 25mUnited Airlines

Deal found 9/21

$69

Sat 10/118:35 amMDW - STL

1 stop7h 03mFrontier

Deal found 9/21

$72

Sun 10/125:05 amORD - STL

1 stop5h 32mFrontier

Deal found 9/20

$72

Wed 10/17:20 amORD - STL

1 stop25h 46mFrontier

Deal found 9/20

$73

Mon 9/296:20 amMDW - STL

1 stop8h 44mFrontier

Deal found 9/21

$78

Wed 11/1912:37 pmORD - STL

1 stop10h 24mFrontier

Deal found 9/21

$78

Tue 10/219:05 amMDW - STL

1 stop4h 45mSouthwest

Deal found 9/21

$79

Tue 10/217:30 amORD - STL

1 stop7h 15mSouthwest

Deal found 9/21

$79

Fri 10/34:48 pmMDW - STL

1 stop16h 18mFrontier

Deal found 9/21

$83

Thu 10/25:10 amORD - STL

1 stop9h 54mFrontier

Deal found 9/21

$83

Cheapflights Fare Finder

Use the filters below to find and compare flights from Illinois to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Thu 10/16

7:40 am-8:50 am

Nonstop1h 10m

Lambert-St Louis

Mon 10/20

6:30 pm-7:40 pm

Nonstop1h 10m

$137

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Thu 10/30

7:40 am-8:50 am

Nonstop1h 10m

Lambert-St Louis

Wed 11/5

1:50 pm-2:55 pm

Nonstop1h 05m

$137

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Fri 11/14

6:15 am-4:01 pm

1 stop9h 46m

Lambert-St Louis

Sun 11/16

11:17 am-10:03 pm

1 stop10h 46m

$150

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Fri 10/3

4:48 pm-9:06 am

1 stop16h 18m

Lambert-St Louis

Mon 10/6

4:00 pm-11:41 pm

1 stop7h 41m

$156

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Tue 10/14

6:15 am-11:45 am

1 stop5h 30m

Lambert-St Louis

Tue 10/14

2:45 pm-7:40 pm

1 stop4h 55m

$157

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 10/30

12:40 pm-10:45 pm

1 stop10h 05m

Lambert-St Louis

Wed 11/5

8:25 am-12:15 pm

1 stop3h 50m

$162

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Wed 10/22

1:10 pm-4:35 pm

1 stop3h 25m

Lambert-St Louis

Fri 10/24

11:11 am-5:47 pm

1 stop6h 36m

$170

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 10/14

5:20 am-10:26 am

1 stop5h 06m

Lambert-St Louis

Tue 10/14

5:15 pm-11:58 pm

1 stop6h 43m

$177

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 10/16

11:01 am-12:28 pm

Nonstop1h 27m

Lambert-St Louis

Mon 10/20

1:00 pm-4:19 pm

1 stop3h 19m

$177

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Mon 10/27

5:51 pm-11:41 pm

1 stop5h 50m

Lambert-St Louis

Tue 10/28

6:40 am-12:40 pm

1 stop6h 00m

$177

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/22

Showing 1-10 of 39 results

Best time to book a flight from Illinois to St. Louis

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

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

Currently, August is the cheapest month in which you can book a flight from Illinois to St. Louis (average of $311). Flying from Illinois 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 IL to STL?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to St. Louis as you normally would.

Weekly flight availability from Illinois to St. Louis

The most flights from USIL to STL are scheduled on a Monday (69 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (51 on average).

Related info for your journey

What airport do you fly into for flights to St. Louis from Illinois?
If you book a flight to St. Louis from Illinois, 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.
How long is the flight from Illinois to St. Louis?
Airlines like Southwest, Frontier, and Delta fly from Illinois to St. Louis in about 1h 10m. The time it takes to get you to your destination can typically vary by up to 8h 36m. There are 251 mi between Illinois and St. Louis. Both multi-stop and nonstop flights can be found to your destination and back.
What are the most popular routes from Illinois to St. Louis?
When deciding which route to take from Illinois to St. Louis consider Chicago O'Hare Intl - Lambert-St Louis, Chicago Midway - Lambert-St Louis or Springfield Capital - Lambert-St Louis as they are the most popular.
What are the most reliable airlines from Illinois to St. Louis?
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 Illinois to St. Louis on time: SkyWest Airlines (81%), ANA (76%), Envoy Air (73%).
What are the cheapest flights from Illinois to St. Louis?
Looking at all options, your cheapest flight can be booked for $48. While the most popular route (Chicago O'Hare Intl - Lambert-St Louis) can be booked for $137 on average, our data indicates $279 when flying from Illinois to St. Louis.
Can I find deals for flights from Illinois to St. Louis that include hotel bookings?
Yes. In addition to deals on Illinois to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Illinois to St. Louis?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to St. Louis.
Can I find deals for business class flights from Illinois to St. Louis?
Yes. Cheapflights offers flight deals from Illinois 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 Illinois to St. Louis?
Currently, August is the cheapest month in which you can book a flight from Illinois to St. Louis (average of $311). Flying from Illinois 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

Edwardsville

O'Fallon

Fairview Heights

Maryland Heights

Collinsville

Eureka

Glencoe

St. Peters

Chesterfield

Alton

Farmington

Festus

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Top 4 airlines flying from Illinois to St. Louis

Airline	Cheapest	Average	Flexibility	On-time
Southwest	Cheapest$77	Average$298	FlexibilityNo cancel fee	On-time63%
American Airlines	Cheapest$115	Average$291	FlexibilityNo cancel fee	On-time71%
Southern / Mokulele	Cheapest$118	Average$214	FlexibilityNo cancel fee	On-timeN/A
United Airlines	Cheapest$152	Average$311	FlexibilityNo cancel fee	On-time69%

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$68+ Cheap flights from Illinois 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 10/27. Fares are subject to change and may not be available on all flights or dates of travel.

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Cheap flight deals from Illinois to St. Louis

Keep the following information in mind while searching for Illinois to St. Louis flight deals. Data was last updated September 22, 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Illinois to St. Louis

Cheapest flights from Illinois to St. LouisExplore the most affordable flight options available from Illinois to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 22, 2025.

Explore the most affordable flight options available from Illinois to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 22, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Illinois to St. Louis that are best for you.

Best time to book a flight from Illinois to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Illinois with our price prediction graph.

Cheapflights Insights

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

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

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

Find hourly flight availability from Illinois 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 September 22, 2025.

Weekly flight availability from Illinois to St. Louis

Related info for your journey

Find useful and relevant information for your journey from Illinois 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 Illinois?

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

What are the most popular routes from Illinois to St. Louis?

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

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

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

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

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

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

Traveling to a place near St. Louis?

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Alternative routes for Illinois to St. Louis

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Top 4 airlines flying from Illinois to St. Louis

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Cheapest flights from Illinois to St. Louis
Explore the most affordable flight options available from Illinois to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 22, 2025.