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St. Louis

$57+ 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 3/27. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — STL
Nov 26 — Dec 31
Tue 11/26
Tue 12/3
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 November 21, 2024.

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 November 21, 2024.

This Mytrip deal was found by Cheapflights users on 11/19. 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 12/129:25 pmORD - STL
1 stop14h 05mSouthern / Mokulele
Mon 12/162:00 pmSTL - ORD
1 stop26h 10mSouthern / Mokulele
Deal found 11/19$110
This American Airlines deal was found by Cheapflights users on 11/20. 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.
Tue 12/103:05 pmORD - STL
Nonstop1h 16mAmerican Airlines
Wed 12/115:45 amSTL - ORD
Nonstop1h 27mAmerican Airlines
Deal found 11/20$137
This Southwest deal was found by Cheapflights users on 11/19. 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.
Wed 12/117:25 pmMDW - STL
Nonstop1h 15mSouthwest
Thu 12/126:30 amSTL - MDW
Nonstop1h 10mSouthwest
Deal found 11/19$143
This Frontier deal was found by Cheapflights users on 11/21. 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.
Thu 12/129:35 amORD - STL
1 stop13h 49mFrontier
Sun 12/155:02 pmSTL - ORD
1 stop16h 52mFrontier
Deal found 11/21$159
This Booking.com deal was found by Cheapflights users on 11/20. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/1510:58 amMDW - STL
1 stop21h 17mFrontier
Tue 12/173:53 pmSTL - MDW
1 stop18h 02mFrontier
Deal found 11/20$168
This Mytrip deal was found by Cheapflights users on 11/20. 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.
Mon 12/167:45 pmORD - STL
2 stops19h 36mMultiple Airlines
Fri 12/2012:15 pmSTL - ORD
1 stop3h 35mMultiple Airlines
Deal found 11/20$178
This Delta deal was found by Cheapflights users on 11/20. 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 12/102:15 pmMDW - STL
1 stop4h 14mDelta
Wed 12/1111:25 amSTL - MDW
1 stop5h 36mDelta
Deal found 11/20$181
This Delta deal was found by Cheapflights users on 11/20. 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 12/107:05 amORD - STL
2 stops11h 24mDelta
Wed 12/1110:21 amSTL - ORD
1 stop4h 17mDelta
Deal found 11/20$181
This United Airlines deal was found by Cheapflights users on 11/21. 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 12/1810:50 amORD - STL
Nonstop1h 29mUnited Airlines
Sun 12/225:00 amSTL - ORD
Nonstop1h 35mUnited Airlines
Deal found 11/21$217
This FlightHub deal was found by Cheapflights users on 11/21. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/145:00 amORD - STL
1 stop10h 21mSpirit Airlines
Sat 12/144:26 pmSTL - ORD
1 stop17h 11mSpirit Airlines
Deal found 11/21$296
This Southwest deal was found by Cheapflights users on 11/20. 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.
Sun 12/85:45 amORD - STL
2 stops6h 55mSouthwest
Mon 12/911:05 amSTL - ORD
2 stops7h 05mSouthwest
Deal found 11/20$390
This Mytrip deal was found by Cheapflights users on 11/19. 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.
Sat 11/2310:24 amSPI - STL
3 stops30h 02mMultiple Airlines
Tue 12/35:21 pmSTL - SPI
2 stops16h 23mMultiple Airlines
Deal found 11/19$485

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 2,612,795 searches. Data last updated November 21, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Mon 1/6

8:25 am-7:55 pm

1 stop11h 30m

Lambert-St Louis

Mon 1/13

12:15 pm-3:50 pm

1 stop3h 35m

$103

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Wed 1/1

8:20 pm-7:55 pm

1 stop23h 35m

Lambert-St Louis

Sat 1/18

5:05 pm-9:52 am

1 stop16h 47m

$129

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Fri 1/31

3:37 pm-11:31 pm

1 stop7h 54m

Lambert-St Louis

Sun 2/2

5:05 pm-10:28 am

1 stop17h 23m

$138

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Sun 2/9

8:45 pm-10:09 pm

Nonstop1h 24m

Lambert-St Louis

Wed 2/26

5:45 am-7:06 am

Nonstop1h 21m

$142

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Fri 12/13

7:25 am-8:45 am

Nonstop1h 20m

Lambert-St Louis

Mon 12/16

6:30 am-7:40 am

Nonstop1h 10m

$148

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 12/12

9:35 am-11:24 pm

1 stop13h 49m

Lambert-St Louis

Sun 12/15

5:02 pm-9:54 am

1 stop16h 52m

$159

ChicagoSt. Louis

MDW - STL

MDWSTL

Chicago Midway

Mon 1/6

6:00 am-11:47 am

1 stop5h 47m

Lambert-St Louis

Mon 1/13

6:30 am-1:08 pm

1 stop6h 38m

$176

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Sat 1/11

6:15 am-10:54 am

1 stop4h 39m

Lambert-St Louis

Sat 1/18

6:30 am-12:55 pm

1 stop6h 25m

$176

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Thu 12/12

8:50 pm-10:13 pm

Nonstop1h 23m

Lambert-St Louis

Sun 12/15

12:15 pm-7:40 am

1 stop19h 25m

$195

ChicagoSt. Louis

ORD - STL

ORDSTL

Chicago O'Hare Intl

Tue 1/21

6:15 am-4:55 pm

2 stops10h 40m

Lambert-St Louis

Thu 1/23

3:35 pm-10:20 pm

1 stop6h 45m

$226

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/21

Showing 1-10 of 26 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, September is the cheapest month in which you can book a flight from Illinois to St. Louis (average of $308). Flying from Illinois to St. Louis in March is currently the most expensive (average of $357). 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 November 21, 2024.

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 November 21, 2024.

The most flights from USIL to STL are scheduled on a Thursday (55 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (26 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 November 21, 2024.
Get a feel of what it's like to fly with Southern / Mokulele, American Airlines 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
5,005 reviews

Comfort

8.1

Boarding

8.2

Overall

8.1

Crew

8.7

Entertainment

7.7

Food

7.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Southwest
8.1
Very good
5,005 reviews
Southwest
8.1
Very good
5,005 reviews

Comfort

8.1

Boarding

8.2

Overall

8.1

Crew

8.7

Entertainment

7.7

Food

7.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Alaska Airlines
8.0
Very good
9,464 reviews
Southwest
8.1
Very good
5,005 reviews

Comfort

8.1

Boarding

8.2

Overall

8.1

Crew

8.7

Entertainment

7.7

Food

7.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Delta
8.0
Very good
8,755 reviews
Southwest
8.1
Very good
5,005 reviews

Comfort

8.1

Boarding

8.2

Overall

8.1

Crew

8.7

Entertainment

7.7

Food

7.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

United Airlines
7.4
Good
9,172 reviews
Southwest
8.1
Very good
5,005 reviews

Comfort

8.1

Boarding

8.2

Overall

8.1

Crew

8.7

Entertainment

7.7

Food

7.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

WestJet
7.3
Good
2,811 reviews
Southwest
8.1
Very good
5,005 reviews

Comfort

8.1

Boarding

8.2

Overall

8.1

Crew

8.7

Entertainment

7.7

Food

7.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

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 Southern / Mokulele, with whom users have recently found tickets for as low as $60. However, be on the lookout for offers from Frontier 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 (94%), Envoy Air (93%), Japan Airlines (90%).

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

    Looking at all options, your cheapest flight can be booked for $113. While the most popular route (Chicago O'Hare Intl - Lambert-St Louis) can be booked for $91 on average our data indicates $281 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, September is the cheapest month in which you can book a flight from Illinois to St. Louis (average of $308). Flying from Illinois to St. Louis in March is currently the most expensive (average of $357). 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.

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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 2,612,795 searches. Data last updated November 21, 2024.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$115Average$269FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$128Average$308FlexibilityNo cancel feeOn-time69%
Southern / MokuleleCheapest$143Average$178FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$181Average$376FlexibilityNo cancel feeOn-time63%
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