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

The cheapest airline one-way is Southwest, with whom users have recently found tickets for as low as $59. However, be on the lookout for offers from American Airlines and Southern / Mokulele, as they are both options that can get you from Illinois to St. Louis for a low price.

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 $63. While the most popular route (Chicago O'Hare Intl - Lambert-St Louis) can be booked for $117 on average our data indicates $345 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: Turkish Airlines (94%), Avianca (89%), Aer Lingus (89%).

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.

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

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 61 days in advance, which can save you up to 110% on flights from Illinois to St. Louis compared to booking the week you need them. Waiting 61 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $246. For sooner than that we have options available in the next 3 days from $293.

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

Our data shows that May tends to be the cheapest month to fly to St. Louis from Illinois. Users have commonly found prices around $281 for the month, but tickets can be as low as $117. Due to multiple factors, prepare for potentially higher prices in January.

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.

$59+ Flights from Illinois to St. Louis

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Cheap flight deals from Illinois to St. Louis

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$97 (Southwest)
One-way from	$59 (Southwest)
Popular in	January
Cheapest in	May
Average price	$287
Good round-trip deal	$134 or less
Good one-way deal	$100 or less

Provider with most accurate pricing for Chicago (CHI)-Lambert-St Louis flight deals.

Search Deals

Provider most trusted by Cheapflights users for Chicago (CHI)-Lambert-St Louis flights.

Search Deals

From Illinois to Lambert-St Louis

Search Deals

One-way flight from Illinois to Lambert-St Louis

Search Deals

Highest demand for flights based on searches. 9% potential increase in price ($28 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in March 2025

Search Deals

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 March 26, 2025.

Wed 5/285:40 pmMDW - STL

Nonstop1h 15mSouthwest

Thu 5/295:35 amSTL - MDW

Nonstop1h 10mSouthwest

Deal found 3/25

$97

Wed 4/231:15 pmORD - STL

Nonstop1h 27mUnited Airlines

Thu 4/249:39 amSTL - ORD

Nonstop1h 31mUnited Airlines

Deal found 3/25

$97

Tue 5/68:29 amORD - STL

Nonstop1h 20mAmerican Airlines

Tue 5/207:30 pmSTL - ORD

Nonstop1h 20mAmerican Airlines

Deal found 3/25

$98

Tue 4/227:00 amORD - STL

1 stop6h 30mSouthwest

Tue 4/292:20 pmSTL - ORD

1 stop7h 10mSouthwest

Deal found 3/25

$117

Fri 5/28:25 amORD - STL

1 stop11h 45mSouthern / Mokulele

Mon 5/55:15 pmSTL - ORD

1 stop14h 25mSouthern / Mokulele

Deal found 3/24

$136

Sat 5/104:15 pmORD - STL

1 stop7h 51mMultiple Airlines

Sun 5/1112:15 pmSTL - ORD

1 stop3h 35mMultiple Airlines

Deal found 3/24

$158

Thu 4/175:30 amORD - STL

1 stop6h 15mDelta

Mon 4/216:50 amSTL - ORD

1 stop5h 49mDelta

Deal found 3/25

$177

Fri 4/258:01 pmMDW - STL

1 stop14h 00mFrontier

Wed 4/306:58 pmSTL - MDW

1 stop24h 10mFrontier

Deal found 3/25

$181

Fri 4/183:02 pmMDW - STL

2 stops8h 32mDelta

Mon 4/211:41 pmSTL - MDW

1 stop4h 39mDelta

Deal found 3/25

$182

Tue 4/19:34 amORD - STL

1 stop14h 12mFrontier

Sun 4/64:57 pmSTL - ORD

1 stop15h 47mFrontier

Deal found 3/25

$189

Fri 5/912:41 pmORD - STL

1 stop20h 34mSpirit Airlines

Sun 5/1110:10 amSTL - ORD

2 stops30h 15mSpirit Airlines

Deal found 3/25

$260

Wed 5/2110:16 amSPI - STL

1 stop37h 35mAmerican Airlines

Tue 5/276:00 amSTL - SPI

1 stop11h 55mAmerican Airlines

Deal found 3/24

$475

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 March 26, 2025.

Thu 4/2411:10 amMDW - STL

Nonstop1h 10mSouthwest

Thu 5/18:50 amSTL - MDW

Nonstop1h 05mSouthwest

Deal found 3/25

$97

Wed 4/231:15 pmORD - STL

Nonstop1h 27mUnited Airlines

Thu 4/249:39 amSTL - ORD

Nonstop1h 31mUnited Airlines

Deal found 3/25

$97

Tue 5/68:29 amORD - STL

Nonstop1h 20mAmerican Airlines

Tue 5/207:30 pmSTL - ORD

Nonstop1h 20mAmerican Airlines

Deal found 3/25

$98

Thu 4/248:25 amORD - STL

1 stop11h 45mSouthern / Mokulele

Thu 5/15:15 pmSTL - ORD

1 stop14h 25mSouthern / Mokulele

Deal found 3/25

$123

Sat 5/104:15 pmORD - STL

1 stop7h 51mMultiple Airlines

Sun 5/1112:15 pmSTL - ORD

1 stop3h 35mMultiple Airlines

Deal found 3/24

$158

Thu 4/175:30 amORD - STL

1 stop6h 15mDelta

Mon 4/216:50 amSTL - ORD

1 stop5h 49mDelta

Deal found 3/25

$177

Fri 4/258:01 pmMDW - STL

1 stop14h 00mFrontier

Wed 4/306:58 pmSTL - MDW

1 stop24h 10mFrontier

Deal found 3/25

$181

Tue 4/227:00 amORD - STL

1 stop6h 30mSouthwest

Tue 4/292:20 pmSTL - ORD

1 stop7h 10mSouthwest

Deal found 3/25

$117

Fri 5/912:41 pmORD - STL

1 stop20h 34mSpirit Airlines

Sun 5/1110:10 amSTL - ORD

2 stops30h 15mSpirit Airlines

Deal found 3/25

$260

Fri 4/183:02 pmMDW - STL

2 stops8h 32mDelta

Mon 4/211:41 pmSTL - MDW

1 stop4h 39mDelta

Deal found 3/25

$182

Sun 4/612:22 pmORD - STL

1 stop11h 24mFrontier

Wed 4/96:51 pmSTL - ORD

1 stop5h 46mFrontier

Deal found 3/25

$189

Thu 5/1510:16 amSPI - STL

1 stop13h 35mAmerican Airlines

Mon 5/267:30 pmSTL - SPI

1 stop22h 25mAmerican Airlines

Deal found 3/24

$575

Last-minute flights from Illinois to St. Louis
Discover last-minute flight deals from Illinois to St. Louis. Data last updated March 26, 2025 and is based on user searches.

Tue 4/19:34 amORD - STL

1 stop14h 12mFrontier

Sun 4/64:57 pmSTL - ORD

1 stop15h 47mFrontier

Deal found 3/25

$189

Tue 4/15:10 amORD - STL

1 stop12h 42mSpirit Airlines

Sun 4/66:47 pmSTL - ORD

2 stops16h 22mSpirit Airlines

Deal found 3/25

$418

Tue 4/16:45 amORD - STL

2 stops10h 07mDelta

Sun 4/66:00 amSTL - ORD

2 stops6h 41mDelta

Deal found 3/25

$591

Wed 4/28:50 amMDW - STL

Nonstop1h 15mSouthwest

Fri 4/41:45 pmSTL - MDW

Nonstop1h 05mSouthwest

Deal found 3/25

$561

Wed 4/21:15 pmORD - STL

Nonstop1h 27mUnited Airlines

Fri 4/48:00 amSTL - ORD

Nonstop1h 31mUnited Airlines

Deal found 3/25

$561

Wed 4/27:00 amORD - STL

1 stop6h 35mSouthwest

Fri 4/49:55 amSTL - ORD

2 stops8h 15mSouthwest

Deal found 3/25

$586

Thu 4/38:25 amORD - STL

1 stop11h 45mSouthern / Mokulele

Sun 4/65:15 pmSTL - ORD

1 stop14h 22mSouthern / Mokulele

Deal found 3/25

$197

Fri 4/41:10 pmORD - STL

1 stop3h 35mMultiple Airlines

Fri 4/46:51 pmSTL - ORD

1 stop5h 46mMultiple Airlines

Deal found 3/25

$222

Fri 4/48:15 amORD - STL

Nonstop1h 22mAmerican Airlines

Fri 4/412:00 pmSTL - ORD

Nonstop1h 24mAmerican Airlines

Deal found 3/25

$556

Fri 4/46:00 amMDW - STL

1 stop5h 56mDelta

Fri 4/44:43 pmSTL - MDW

1 stop5h 38mDelta

Deal found 3/25

$581

Sat 4/512:58 pmMDW - STL

1 stop10h 48mFrontier

Sun 4/612:37 pmSTL - MDW

1 stop11h 44mFrontier

Deal found 3/26

$189

Mon 4/78:25 amORD - STL

1 stop11h 45mMultiple Airlines

Wed 4/96:51 pmSTL - ORD

1 stop5h 46mMultiple Airlines

Deal found 3/25

$174

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 March 26, 2025.

Thu 4/247:55 amMDW - STL

1 stop5h 20mSouthwest

Deal found 3/25

$59

Thu 4/247:00 amORD - STL

1 stop6h 10mSouthwest

Deal found 3/25

$59

Fri 5/910:30 pmORD - STL

Nonstop1h 21mAmerican Airlines

Deal found 3/25

$64

Thu 4/248:25 amORD - STL

1 stop11h 45mSouthern / Mokulele

Deal found 3/24

$73

Wed 4/232:20 pmORD - STL

Nonstop1h 27mUnited Airlines

Deal found 3/24

$79

Tue 4/14:40 pmMDW - STL

1 stop7h 06mFrontier

Deal found 3/24

$80

Wed 7/95:14 pmORD - STL

1 stop6h 29mFrontier

Deal found 3/25

$80

Tue 4/299:52 amMDW - STL

1 stop6h 34mDelta

Deal found 3/24

$88

Mon 4/285:07 pmORD - STL

2 stops24h 08mSpirit Airlines

Deal found 3/25

$123

Wed 4/235:05 pmORD - STL

2 stops6h 29mDelta

Deal found 3/24

$145

Thu 4/247:33 pmORD - STL

3 stops23h 08mMultiple Airlines

Deal found 3/25

$146

Mon 6/168:36 pmMDW - STL

2 stops21h 56mMultiple Airlines

Deal found 3/25

$177

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

Wed 5/28

5:40 pm-6:55 pm

Nonstop1h 15m

Lambert-St Louis

Thu 5/29

5:35 am-6:45 am

Nonstop1h 10m

$97

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Wed 4/23

1:15 pm-2:42 pm

Nonstop1h 27m

Lambert-St Louis

Thu 4/24

9:39 am-11:10 am

Nonstop1h 31m

$97

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 5/6

8:29 am-9:49 am

Nonstop1h 20m

Lambert-St Louis

Tue 5/20

7:30 pm-8:50 pm

Nonstop1h 20m

$98

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 4/22

7:00 am-1:30 pm

1 stop6h 30m

Lambert-St Louis

Tue 4/29

2:20 pm-9:30 pm

1 stop7h 10m

$117

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Fri 5/2

8:25 am-8:10 pm

1 stop11h 45m

Lambert-St Louis

Mon 5/5

5:15 pm-7:40 am

1 stop14h 25m

$136

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Sat 5/10

4:15 pm-12:06 am

1 stop7h 51m

Lambert-St Louis

Sun 5/11

12:15 pm-3:50 pm

1 stop3h 35m

$158

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 4/17

5:30 am-11:45 am

1 stop6h 15m

Lambert-St Louis

Mon 4/21

6:50 am-12:39 pm

1 stop5h 49m

$177

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Fri 4/25

8:01 pm-10:01 am

1 stop14h 00m

Lambert-St Louis

Wed 4/30

6:58 pm-7:08 pm

1 stop24h 10m

$181

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Fri 4/18

3:02 pm-11:34 pm

2 stops8h 32m

Lambert-St Louis

Mon 4/21

1:41 pm-6:20 pm

1 stop4h 39m

$182

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Sun 4/6

12:22 pm-11:46 pm

1 stop11h 24m

Lambert-St Louis

Wed 4/9

6:51 pm-12:37 am

1 stop5h 46m

$189

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/25

Showing 1-10 of 24 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 Tuesday (51 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (4 on average).

Rainfall in St. Louis by month

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.

Temperature in St. Louis by month

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).

Reviews of airlines servicing St. Louis

Get a feel of what it's like to fly with Southwest, Delta and United Airlines from Illinois to St. Louis by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Southwest

8.1

Very good

4,274 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Southwest

8.1

Very good

4,274 reviews

Southwest

8.1

Very good

4,274 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Delta

8.0

Very good

7,891 reviews

Southwest

8.1

Very good

4,274 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

United Airlines

7.4

Good

8,608 reviews

Southwest

8.1

Very good

4,274 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

American Airlines

7.2

Good

10,000 reviews

Southwest

8.1

Very good

4,274 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

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.
What are the cheapest airlines to fly from Illinois to St. Louis one-way?
The cheapest airline one-way is Southwest, with whom users have recently found tickets for as low as $59. However, be on the lookout for offers from American Airlines and Southern / Mokulele, as they are both options that can get you from Illinois to St. Louis for a low price.
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: Turkish Airlines (94%), Avianca (89%), Aer Lingus (89%).
What are the cheapest flights from Illinois to St. Louis?
Looking at all options, your cheapest flight can be booked for $63. While the most popular route (Chicago O'Hare Intl - Lambert-St Louis) can be booked for $117 on average our data indicates $345 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

Fenton

Fairview Heights

Maryland Heights

Collinsville

Wentzville

Eureka

St. Peters

Festus

Glencoe

Alton

Farmington

Chesterfield

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Top 4 airlines flying from Illinois to St. Louis

Airline	Cheapest	Average	Flexibility	On-time
American Airlines	Cheapest$115	Average$268	FlexibilityNo cancel fee	On-time71%
Southwest	Cheapest$116	Average$328	FlexibilityNo cancel fee	On-time63%
Southern / Mokulele	Cheapest$117	Average$177	FlexibilityNo cancel fee	On-timeN/A
United Airlines	Cheapest$137	Average$326	FlexibilityNo cancel fee	On-time69%

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$59+ 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 4/24. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Illinois to St. Louis with Cheapflights

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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 March 26, 2025.

Most accurate provider

Most trusted provider

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 March 26, 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 March 26, 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 March 26, 2025.

Weekly flight availability from Illinois to St. Louis

Explore weekly flight availability from Illinois to St. Louis. 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 March 26, 2025.

Rainfall in St. Louis by month

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

Temperature in St. Louis by month

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

Reviews of airlines servicing St. Louis

Get a feel of what it's like to fly with Southwest, Delta and United Airlines from Illinois to St. Louis by reading reviews from past customers. 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 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?

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

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 Illinois?

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Alternative routes for Illinois to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.

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 March 26, 2025.