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$63+ Cheap flights from St. Louis (STL) to Illinois

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 12/18. Fares are subject to change and may not be available on all flights or dates of travel.
STL — ORD
Nov 26 — Dec 31
Tue 11/26
Tue 12/3
1 adult, Economy
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Cheap flight deals from St. Louis to Illinois

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

Cheapest flights from St. Louis to Illinois
Explore the most affordable flight options available from St. Louis to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 21, 2024.

This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/59:20 amSTL - UIN
Nonstop1h 00mSouthern / Mokulele
Thu 12/1211:10 amUIN - STL
Nonstop1h 00mSouthern / Mokulele
Deal found 11/20$88
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.
Wed 12/1112:15 pmSTL - ORD
1 stop3h 35mSouthern / Mokulele
Thu 12/128:25 amORD - STL
1 stop11h 30mSouthern / Mokulele
Deal found 11/20$116
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/185:40 pmSTL - ORD
Nonstop1h 15mUnited Airlines
Wed 12/256:20 pmORD - STL
Nonstop1h 37mUnited Airlines
Deal found 11/20$137
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.
Fri 12/63:34 pmSTL - MDW
1 stop5h 28mFrontier
Mon 12/911:33 amMDW - STL
1 stop11h 51mFrontier
Deal found 11/21$138
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.
Wed 12/116:30 amSTL - MDW
Nonstop1h 10mSouthwest
Thu 12/129:50 amMDW - STL
Nonstop1h 15mSouthwest
Deal found 11/20$143
This American Airlines 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/155:45 amSTL - ORD
Nonstop1h 22mAmerican Airlines
Tue 12/3110:00 amORD - STL
Nonstop1h 32mAmerican Airlines
Deal found 11/19$143
This Trip.com 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/61:00 pmSTL - ORD
1 stop3h 32mMultiple Airlines
Sun 12/87:25 amORD - STL
1 stop24h 48mMultiple Airlines
Deal found 11/19$170
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.
Thu 12/196:04 amSTL - MDW
1 stop5h 04mDelta
Wed 12/254:50 pmMDW - STL
1 stop5h 16mDelta
Deal found 11/20$176
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/166:00 amSTL - ORD
2 stops7h 00mDelta
Mon 1/201:40 pmORD - STL
1 stop7h 16mDelta
Deal found 11/21$186
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.
Fri 12/134:15 pmSTL - ORD
1 stop5h 45mSouthwest
Sun 12/155:45 amORD - STL
2 stops6h 55mSouthwest
Deal found 11/20$261
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.
Thu 12/124:26 pmSTL - ORD
2 stops19h 52mSpirit Airlines
Sun 12/155:00 amORD - STL
1 stop10h 21mSpirit Airlines
Deal found 11/20$311
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/264:33 pmSTL - MDW
1 stop16h 23mAvelo Airlines
Tue 12/39:21 amMDW - STL
1 stop6h 32mAvelo Airlines
Deal found 11/21$346

Find flights from St. Louis to Illinois within your budget

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

St. LouisQuincy

STL - UIN

STLUIN

Lambert-St Louis

Thu 12/5

9:20 am-10:20 am

Nonstop1h 00m

Quincy Regional

Thu 12/12

11:10 am-12:10 pm

Nonstop1h 00m

$88

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Fri 1/31

5:00 pm-7:40 am

1 stop14h 40m

Chicago O'Hare Intl

Mon 2/17

8:20 pm-11:45 am

1 stop15h 25m

$115

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Wed 12/18

5:40 pm-6:55 pm

Nonstop1h 15m

Chicago O'Hare Intl

Wed 12/25

6:20 pm-7:57 pm

Nonstop1h 37m

$137

St. LouisChicago

STL - MDW

STLMDW

Lambert-St Louis

Fri 12/6

3:34 pm-9:02 pm

1 stop5h 28m

Chicago Midway

Mon 12/9

11:33 am-11:24 pm

1 stop11h 51m

$138

St. LouisChicago

STL - MDW

STLMDW

Lambert-St Louis

Wed 12/11

6:30 am-7:40 am

Nonstop1h 10m

Chicago Midway

Thu 12/12

9:50 am-11:05 am

Nonstop1h 15m

$143

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Sun 12/15

5:45 am-7:07 am

Nonstop1h 22m

Chicago O'Hare Intl

Tue 12/31

10:00 am-11:32 am

Nonstop1h 32m

$143

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Fri 12/6

1:00 pm-4:32 pm

1 stop3h 32m

Chicago O'Hare Intl

Sun 12/8

7:25 am-8:13 am

1 stop24h 48m

$170

St. LouisChicago

STL - MDW

STLMDW

Lambert-St Louis

Thu 12/19

6:04 am-11:08 am

1 stop5h 04m

Chicago Midway

Wed 12/25

4:50 pm-10:06 pm

1 stop5h 16m

$176

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Mon 1/13

6:00 am-12:55 pm

2 stops6h 55m

Chicago O'Hare Intl

Thu 1/16

7:05 am-11:47 am

1 stop4h 42m

$181

St. LouisChicago

STL - ORD

STLORD

Lambert-St Louis

Mon 1/6

6:50 am-6:10 pm

1 stop11h 20m

Chicago O'Hare Intl

Fri 1/10

6:15 am-4:55 pm

2 stops10h 40m

$210

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/21

Showing 1-10 of 27 results
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Best time to book a flight from St. Louis to Illinois

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

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

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

Currently, September is the cheapest month in which you can book a flight from St. Louis to Illinois (average of $232). Flying from St. Louis to Illinois in June is currently the most expensive (average of $308). 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 STL to IL?

Find hourly flight availability from St. Louis to Illinois. 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.

When flying from St. Louis to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from St. Louis to Illinois

Explore weekly flight availability from St. Louis to Illinois. 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 STL to USIL are scheduled on a Thursday (61 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (29 on average).

Rainfall in Illinois by month

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

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

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

If weather is an important factor for your trip to Illinois, 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 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. 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 Illinois. Reviews last updated November 21, 2024.
Peruse reviews from past customers who have flown with United Airlines, Delta and Southern / Mokulele from St. Louis to Illinois to help guide your decision. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
5,005 reviews

Overall

8.1

Boarding

8.2

Crew

8.7

Food

7.2

Comfort

8.1

Entertainment

7.7

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

Overall

8.1

Boarding

8.2

Crew

8.7

Food

7.2

Comfort

8.1

Entertainment

7.7

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

Overall

8.1

Boarding

8.2

Crew

8.7

Food

7.2

Comfort

8.1

Entertainment

7.7

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

Overall

8.1

Boarding

8.2

Crew

8.7

Food

7.2

Comfort

8.1

Entertainment

7.7

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

Overall

8.1

Boarding

8.2

Crew

8.7

Food

7.2

Comfort

8.1

Entertainment

7.7

Reviews

1 / 10

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

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
5,005 reviews

Overall

8.1

Boarding

8.2

Crew

8.7

Food

7.2

Comfort

8.1

Entertainment

7.7

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 St. Louis to Illinois. 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 from for flights from St. Louis to Illinois?

    Located just 12.7 mi from the city center, Lambert-St Louis (STL) is the airport most travelers will use when flying to Illinois from St. Louis.

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

    For one-way options, check prices for Southern / Mokulele. According to our data, you can fly for as low as $63. Users have also found prices from $65 and $69 on Frontier and Southwest, respectively.

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

    Most travelers choose Lambert-St Louis - Chicago O'Hare Intl, Lambert-St Louis - Chicago Midway or Lambert-St Louis - Quincy Regional when deciding on the best route from St. Louis to Illinois.

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

    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 St. Louis to Illinois on time: Avianca (100%), Copa Airlines (96%), Republic Airways (95%).

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

    The cheapest flight price from St. Louis to Illinois is $131. On average you can expect to pay $898. The most popular route, (Lambert-St Louis - Chicago O'Hare Intl), can usually be booked for $109.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from St. Louis to Illinois 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 St. Louis to Illinois?

    Currently, September is the cheapest month in which you can book a flight from St. Louis to Illinois (average of $232). Flying from St. Louis to Illinois in June is currently the most expensive (average of $308). 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 St. Louis to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from St. Louis to Illinois

Discover the top 4 airlines that operate flights from St. Louis to Illinois. 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$259FlexibilityNo cancel feeOn-time71%
Southern / MokuleleCheapest$118Average$181FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$119Average$304FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$195Average$295FlexibilityNo cancel feeOn-time63%
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