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St. Louis

$65+ 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 2/7. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — STL
Jan 26 — Feb 21
Sun 1/26
Sun 2/2
1 adult, Economy
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Cheap flight deals from Illinois to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Illinois (USIL) to St. Louis (STL). 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 21, 2025.

Round-trip from

$125
(Mytrip)

One-way from

$65
(Mytrip)

Good round-trip deal

$245 or less

Good one-way deal

$148 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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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 January 21, 2025.

This Mytrip deal was found by Cheapflights users on 1/21. 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 2/138:25 amORD - STL
1 stop11h 45mSouthern / Mokulele
Mon 2/1712:15 pmSTL - ORD
1 stop19h 25mSouthern / Mokulele
Deal found 1/21$125
This Southwest deal was found by Cheapflights users on 1/21. 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 2/135:25 amMDW - STL
Nonstop1h 20mSouthwest
Mon 2/176:00 amSTL - MDW
Nonstop1h 10mSouthwest
Deal found 1/21$137
This United Airlines deal was found by Cheapflights users on 1/21. 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.
Wed 3/51:15 pmORD - STL
Nonstop1h 21mUnited Airlines
Thu 3/205:33 pmSTL - ORD
Nonstop1h 22mUnited Airlines
Deal found 1/21$137
This CheapOair deal was found by Cheapflights users on 1/21. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/268:20 pmORD - STL
1 stop15h 25mMultiple Airlines
Sat 3/18:52 pmSTL - ORD
1 stop8h 13mMultiple Airlines
Deal found 1/21$138
This American Airlines deal was found by Cheapflights users on 1/21. 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.
Thu 2/139:55 amORD - STL
Nonstop1h 30mAmerican Airlines
Mon 2/175:45 amSTL - ORD
Nonstop1h 21mAmerican Airlines
Deal found 1/21$139
This Frontier deal was found by Cheapflights users on 1/21. 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.
Fri 2/73:37 pmMDW - STL
1 stop7h 54mFrontier
Sun 2/98:31 pmSTL - MDW
1 stop15h 13mFrontier
Deal found 1/21$150
This CheapOair deal was found by Cheapflights users on 1/20. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/910:59 amORD - STL
1 stop12h 32mFrontier
Wed 2/267:04 pmSTL - ORD
1 stop18h 21mFrontier
Deal found 1/20$150
This Southwest deal was found by Cheapflights users on 1/21. 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.
Tue 2/2511:25 amORD - STL
1 stop4h 25mSouthwest
Thu 2/275:20 amSTL - ORD
2 stops8h 40mSouthwest
Deal found 1/21$162
This Delta deal was found by Cheapflights users on 1/21. 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 2/1310:19 amMDW - STL
1 stop4h 31mDelta
Mon 2/176:43 amSTL - MDW
1 stop6h 22mDelta
Deal found 1/21$177
This Delta deal was found by Cheapflights users on 1/21. 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 2/139:35 amORD - STL
1 stop5h 59mDelta
Mon 2/173:35 pmSTL - ORD
1 stop6h 23mDelta
Deal found 1/21$177
This American Airlines deal was found by Cheapflights users on 1/20. 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.
Wed 2/51:00 pmSPI - STL
1 stop9h 09mAmerican Airlines
Sun 2/912:00 pmSTL - SPI
1 stop47h 33mAmerican Airlines
Deal found 1/20$747

Find flights from Illinois to St. Louis within your budget

Customize your flight search to find flights from Illinois to St. Louis 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 21, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 2/13

8:25 am-8:10 pm

1 stop11h 45m

Lambert-St Louis

Mon 2/17

12:15 pm-7:40 am

1 stop19h 25m

$125

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Thu 2/13

5:25 am-6:45 am

Nonstop1h 20m

Lambert-St Louis

Mon 2/17

6:00 am-7:10 am

Nonstop1h 10m

$137

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 2/18

9:55 am-11:21 am

Nonstop1h 26m

Lambert-St Louis

Tue 2/18

6:00 pm-7:26 pm

Nonstop1h 26m

$137

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Wed 2/26

8:20 pm-11:45 am

1 stop15h 25m

Lambert-St Louis

Sat 3/1

8:52 pm-5:05 am

1 stop8h 13m

$138

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Fri 2/7

3:37 pm-11:31 pm

1 stop7h 54m

Lambert-St Louis

Sun 2/9

8:31 pm-11:44 am

1 stop15h 13m

$150

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Sun 2/9

10:59 am-11:31 pm

1 stop12h 32m

Lambert-St Louis

Wed 2/26

7:04 pm-1:25 pm

1 stop18h 21m

$150

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 2/25

11:25 am-3:50 pm

1 stop4h 25m

Lambert-St Louis

Thu 2/27

5:20 am-2:00 pm

2 stops8h 40m

$162

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Thu 2/13

10:19 am-2:50 pm

1 stop4h 31m

Lambert-St Louis

Mon 2/17

6:43 am-1:05 pm

1 stop6h 22m

$177

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 2/13

9:35 am-3:34 pm

1 stop5h 59m

Lambert-St Louis

Mon 2/17

3:35 pm-9:58 pm

1 stop6h 23m

$177

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 4/24

10:50 am-12:20 pm

Nonstop1h 30m

Lambert-St Louis

Mon 4/28

9:39 am-11:10 am

Nonstop1h 31m

$195

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/21

Showing 1-10 of 23 results
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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.

Travel insights for flights from Illinois to St. Louis

Get recent, data-driven insights about flights from Illinois to St. Louis including ideal travel times, pricing trends, and more.

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?

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 January 21, 2025.

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

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 January 21, 2025.

The most flights from USIL to STL are scheduled on a Monday (49 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (33 on average).

Rainfall in St. Louis by month

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

Plan your trip to St. Louis by taking into account the average temperature totals 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 insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated January 21, 2025.
Get a feel of what it's like to fly with United Airlines, Frontier and Southwest 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
4,662 reviews

Food

7.2

Comfort

8.1

Crew

8.7

Boarding

8.2

Entertainment

7.7

Overall

8.1

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
4,662 reviews
Southwest
8.1
Very good
4,662 reviews

Food

7.2

Comfort

8.1

Crew

8.7

Boarding

8.2

Entertainment

7.7

Overall

8.1

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
8,521 reviews
Southwest
8.1
Very good
4,662 reviews

Food

7.2

Comfort

8.1

Crew

8.7

Boarding

8.2

Entertainment

7.7

Overall

8.1

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
8,984 reviews
Southwest
8.1
Very good
4,662 reviews

Food

7.2

Comfort

8.1

Crew

8.7

Boarding

8.2

Entertainment

7.7

Overall

8.1

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
4,662 reviews

Food

7.2

Comfort

8.1

Crew

8.7

Boarding

8.2

Entertainment

7.7

Overall

8.1

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 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?

    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 Frontier, with whom users have recently found tickets for as low as $65. However, be on the lookout for offers from Southern / Mokulele and Southwest, 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: Republic Airways (92%), Turkish Airlines (88%), American Airlines (83%).

  • 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 $126 on average our data indicates $346 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

Traveling to a place near Illinois?

Book flights to Illinois if you plan to visit one of these locations
Fenton
Fairview Heights
Maryland Heights
Collinsville
Wentzville
Eureka
St. Peters
Festus
Alton
Farmington
Chesterfield

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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.
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Top 4 airlines flying from Illinois to St. Louis

Discover the top 4 airlines that operate flights from Illinois to St. Louis. 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 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$115Average$282FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$116Average$328FlexibilityNo cancel feeOn-time63%
Southern / MokuleleCheapest$117Average$178FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$125Average$305FlexibilityNo cancel feeOn-time69%
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