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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 3/26. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — STL
Feb 25 — Mar 41
Tue 2/25
Tue 3/4
1 adult, Economy
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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 February 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$110
(Frontier)

One-way from

$59
(Southwest)

Popular in

January

Cheapest in

May

Average price

$295

Good round-trip deal

$216 or less

Good one-way deal

$128 or less
Provider with most accurate pricing for Chicago (CHI)-Lambert-St Louis flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-Lambert-St Louis flights.
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From Illinois to Lambert-St Louis
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One-way flight from Illinois to Lambert-St Louis
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Highest demand for flights based on searches. 11% potential increase in price ($36 potential increase over avg. RT price).
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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 February 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 February 20, 2025.

This Frontier deal was found by Cheapflights users on 2/18. 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.
Thu 4/310:19 amMDW - STL
1 stop13h 27mFrontier
Mon 4/76:38 pmSTL - MDW
1 stop10h 45mFrontier
Deal found 2/18$110
This Frontier deal was found by Cheapflights users on 2/19. 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.
Thu 4/39:20 amORD - STL
1 stop14h 26mFrontier
Mon 4/76:38 pmSTL - ORD
1 stop10h 27mFrontier
Deal found 2/19$110
This Southwest deal was found by Cheapflights users on 2/20. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/61:15 pmMDW - STL
Nonstop1h 10mSouthwest
Mon 3/108:35 pmSTL - MDW
Nonstop1h 10mSouthwest
Deal found 2/20$117
This American Airlines deal was found by Cheapflights users on 2/20. 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.
Thu 3/68:57 pmORD - STL
Nonstop1h 17mAmerican Airlines
Mon 3/105:55 amSTL - ORD
Nonstop1h 20mAmerican Airlines
Deal found 2/20$117
This Mytrip deal was found by Cheapflights users on 2/19. 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 4/39:20 amORD - STL
1 stop14h 26mMultiple Airlines
Thu 4/1012:15 pmSTL - ORD
1 stop3h 35mMultiple Airlines
Deal found 2/19$131
This Southwest deal was found by Cheapflights users on 2/19. 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 4/245:45 pmORD - STL
1 stop5h 00mSouthwest
Tue 4/295:55 amSTL - ORD
1 stop8h 05mSouthwest
Deal found 2/19$137
This Gotogate deal was found by Cheapflights users on 2/20. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/138:20 pmORD - STL
1 stop23h 50mSouthern / Mokulele
Sun 3/1612:15 pmSTL - ORD
1 stop19h 25mSouthern / Mokulele
Deal found 2/20$139
This Delta deal was found by Cheapflights users on 2/18. 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.
Sat 4/54:00 pmMDW - STL
1 stop7h 30mDelta
Sat 4/126:00 amSTL - MDW
1 stop4h 42mDelta
Deal found 2/18$177
This United Airlines deal was found by Cheapflights users on 2/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/61:01 pmORD - STL
Nonstop1h 22mUnited Airlines
Mon 3/106:30 amSTL - ORD
Nonstop1h 31mUnited Airlines
Deal found 2/20$179
This Delta deal was found by Cheapflights users on 2/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/15:00 pmORD - STL
2 stops6h 03mDelta
Tue 4/81:48 pmSTL - ORD
1 stop6h 57mDelta
Deal found 2/20$182
This Mytrip deal was found by Cheapflights users on 2/20. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/35:10 amORD - STL
1 stop12h 42mSpirit Airlines
Sun 4/66:47 pmSTL - ORD
3 stops39h 12mSpirit Airlines
Deal found 2/20$264
This American Airlines deal was found by Cheapflights users on 2/20. 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.
Mon 4/146:38 pmSPI - STL
1 stop16h 46mAmerican Airlines
Wed 4/3010:17 amSTL - SPI
1 stop7h 44mAmerican Airlines
Deal found 2/20$474

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 February 20, 2025.

Fly from

Illinois

Fly to

St. Louis

Route

Depart

Return

Price

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Thu 4/3

10:19 am-11:46 pm

1 stop13h 27m

Lambert-St Louis

Mon 4/7

6:38 pm-5:23 am

1 stop10h 45m

$110

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 4/3

9:20 am-11:46 pm

1 stop14h 26m

Lambert-St Louis

Mon 4/7

6:38 pm-5:05 am

1 stop10h 27m

$110

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Thu 3/6

1:15 pm-2:25 pm

Nonstop1h 10m

Lambert-St Louis

Mon 3/10

8:35 pm-9:45 pm

Nonstop1h 10m

$117

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 3/6

8:57 pm-10:14 pm

Nonstop1h 17m

Lambert-St Louis

Mon 3/10

5:55 am-7:15 am

Nonstop1h 20m

$117

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 4/3

9:20 am-11:46 pm

1 stop14h 26m

Lambert-St Louis

Thu 4/10

12:15 pm-3:50 pm

1 stop3h 35m

$131

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 4/24

5:45 pm-10:45 pm

1 stop5h 00m

Lambert-St Louis

Tue 4/29

5:55 am-2:00 pm

1 stop8h 05m

$137

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 3/13

8:20 pm-8:10 pm

1 stop23h 50m

Lambert-St Louis

Sun 3/16

12:15 pm-7:40 am

1 stop19h 25m

$139

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Sat 4/5

4:00 pm-11:30 pm

1 stop7h 30m

Lambert-St Louis

Sat 4/12

6:00 am-10:42 am

1 stop4h 42m

$177

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 3/6

1:01 pm-2:23 pm

Nonstop1h 22m

Lambert-St Louis

Mon 3/10

6:30 am-8:01 am

Nonstop1h 31m

$179

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 4/1

5:00 pm-11:03 pm

2 stops6h 03m

Lambert-St Louis

Tue 4/8

1:48 pm-8:45 pm

1 stop6h 57m

$182

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/20

Showing 1-10 of 27 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 February 20, 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 February 20, 2025.

The most flights from USIL to STL are scheduled on a Thursday (52 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (28 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 February 20, 2025.
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
4,411 reviews

Food

7.1

Overall

8.1

Comfort

8.1

Crew

8.7

Entertainment

7.6

Boarding

8.2

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Southwest
8.1
Very good
4,411 reviews
Southwest
8.1
Very good
4,411 reviews

Food

7.1

Overall

8.1

Comfort

8.1

Crew

8.7

Entertainment

7.6

Boarding

8.2

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Delta
8.0
Very good
8,220 reviews
Southwest
8.1
Very good
4,411 reviews

Food

7.1

Overall

8.1

Comfort

8.1

Crew

8.7

Entertainment

7.6

Boarding

8.2

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

United Airlines
7.4
Good
8,766 reviews
Southwest
8.1
Very good
4,411 reviews

Food

7.1

Overall

8.1

Comfort

8.1

Crew

8.7

Entertainment

7.6

Boarding

8.2

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,411 reviews

Food

7.1

Overall

8.1

Comfort

8.1

Crew

8.7

Entertainment

7.6

Boarding

8.2

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

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 Southwest, with whom users have recently found tickets for as low as $59. However, be on the lookout for offers from United Airlines and Frontier, 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 (94%), Turkish Airlines (90%), Avianca (79%).

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

    Looking at all options, your cheapest flight can be booked for $68. While the most popular route (Chicago O'Hare Intl - Lambert-St Louis) can be booked for $117 on average our data indicates $218 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 February 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$115Average$285FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$116Average$298FlexibilityNo cancel feeOn-time63%
Southern / MokuleleCheapest$117Average$178FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$131Average$307FlexibilityNo cancel feeOn-time69%
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