Cheap flights from St. Louis (STL) to Illinois from $52

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 8/27. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
STL — ORD
jun. 16 — jun. 231

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

Find a great deal and save up to 57% by booking at least 41 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from St. Louis to Illinois within the next two weeks, with the cheapest ticket starting at $180.

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

April can be a great time to fly to Illinois from St. Louis with a flight ticket averaging about $244. Cheapflights users have found deals in the month of April for as cheap as $106. The most expensive prices can be found in the month of July.

What is the cheapest time of day to fly from STL to IL?

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.

Cheap St. Louis to Illinois flights in June & July 2024

Find cheap flight options from St. Louis to Illinois specifically for the months of June and July 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 3,117,830 searches. Prices were last updated on junio 11, 2024.
These are some of the most attractive deals on flights from St. Louis to Illinois in 2024. Check back regularly for other flight deals.
lun. 7/88:35 pmSTL - UIN
Nonstop0h 50mSouthern / Mokulele
lun. 7/156:15 amUIN - STL
Nonstop0h 50mSouthern / Mokulele
Deal found 6/10$86
mar. 7/3012:45 pmSTL - UIN
Nonstop0h 50mSouthern / Mokulele
jue. 8/16:15 amUIN - STL
Nonstop0h 50mSouthern / Mokulele
Deal found 6/10$88
dom. 6/306:00 amSTL - ORD
Nonstop1h 22mAmerican Airlines
mié. 7/38:45 pmORD - STL
Nonstop1h 17mAmerican Airlines
Deal found 6/9$108
sáb. 6/1512:15 pmSTL - ORD
1 stop3h 35mMultiple Airlines
sáb. 6/226:41 amORD - STL
1 stop7h 37mMultiple Airlines
Deal found 6/10$113
mar. 7/26:00 amSTL - ORD
Nonstop1h 22mAmerican Airlines
mar. 7/24:05 pmORD - STL
Nonstop1h 13mAmerican Airlines
Deal found 6/11$117
vie. 6/1412:15 pmSTL - ORD
1 stop19h 25mSouthern / Mokulele
dom. 6/168:20 pmORD - STL
1 stop23h 35mSouthern / Mokulele
Deal found 6/10$118
jue. 6/135:00 pmSTL - ORD
1 stop14h 40mMultiple Airlines
mar. 6/186:00 amORD - STL
1 stop8h 47mMultiple Airlines
Deal found 6/10$119
jue. 6/2012:00 pmSTL - ORD
1 stop4h 10mSouthern / Mokulele
dom. 6/238:20 pmORD - STL
1 stop15h 25mSouthern / Mokulele
Deal found 6/10$121
sáb. 7/2012:15 pmSTL - ORD
1 stop3h 35mSouthern / Mokulele
lun. 7/229:25 pmORD - STL
1 stop14h 05mSouthern / Mokulele
Deal found 6/9$122

St. Louis to Illinois 2024 flight deals

Discover exclusive flight deals for travel between St. Louis and Illinois in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 3,117,830 searches. Data last updated junio 11, 2024.
These are some of the most attractive deals on flights from St. Louis to Illinois in 2024. Check back regularly for other flight deals.
jue. 8/224:45 pmSTL - UIN
Nonstop0h 50mSouthern / Mokulele
lun. 8/2611:15 amUIN - STL
Nonstop0h 50mSouthern / Mokulele
Deal found 6/10$81
lun. 7/88:35 pmSTL - UIN
Nonstop0h 50mSouthern / Mokulele
lun. 7/156:15 amUIN - STL
Nonstop0h 50mSouthern / Mokulele
Deal found 6/10$86
mar. 7/3012:45 pmSTL - UIN
Nonstop0h 50mSouthern / Mokulele
jue. 8/16:15 amUIN - STL
Nonstop0h 50mSouthern / Mokulele
Deal found 6/10$88
jue. 9/511:10 amSTL - ORD
Nonstop1h 21mUnited Airlines
sáb. 10/52:40 pmORD - STL
Nonstop1h 19mUnited Airlines
Deal found 6/11$105
dom. 6/306:00 amSTL - ORD
Nonstop1h 22mAmerican Airlines
mié. 7/38:45 pmORD - STL
Nonstop1h 17mAmerican Airlines
Deal found 6/9$108
sáb. 6/1512:15 pmSTL - ORD
1 stop3h 35mMultiple Airlines
sáb. 6/226:41 amORD - STL
1 stop7h 37mMultiple Airlines
Deal found 6/10$113
mar. 7/26:00 amSTL - ORD
Nonstop1h 22mAmerican Airlines
mar. 7/24:05 pmORD - STL
Nonstop1h 13mAmerican Airlines
Deal found 6/11$117
vie. 6/1412:15 pmSTL - ORD
1 stop19h 25mSouthern / Mokulele
dom. 6/168:20 pmORD - STL
1 stop23h 35mSouthern / Mokulele
Deal found 6/10$118
jue. 6/135:00 pmSTL - ORD
1 stop14h 40mMultiple Airlines
mar. 6/186:00 amORD - STL
1 stop8h 47mMultiple Airlines
Deal found 6/10$119

St. Louis to Illinois flights leaving soon

Find last-minute flight options from St. Louis to Illinois for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 3,117,830 searches. Data last updated junio 11, 2024.
Have a look at some of the last-minute flights available departing from St. Louis to Illinois. To prevent any unwanted surprises, users should verify their flight info before booking.
lun. 6/1710:36 pmSTL - ORD
1 stop11h 55mFrontier
lun. 6/245:58 pmORD - STL
1 stop13h 09mFrontier
Deal found 6/9$117
jue. 6/2012:00 pmSTL - ORD
1 stop4h 10mSouthern / Mokulele
dom. 6/238:20 pmORD - STL
1 stop15h 25mSouthern / Mokulele
Deal found 6/10$121
dom. 6/1612:00 pmSTL - ORD
1 stop19h 40mSouthern / Mokulele
mié. 6/269:25 pmORD - STL
1 stop14h 05mSouthern / Mokulele
Deal found 6/10$123
vie. 6/212:00 pmSTL - ORD
1 stop26h 10mSouthern / Mokulele
mar. 6/259:25 pmORD - STL
1 stop14h 05mSouthern / Mokulele
Deal found 6/9$136
mié. 6/1912:15 pmSTL - ORD
1 stop3h 35mSouthern / Mokulele
sáb. 7/137:05 amORD - STL
1 stop5h 00mSouthern / Mokulele
Deal found 6/11$141
vie. 6/218:35 pmSTL - ORD
1 stop10h 50mSouthern / Mokulele
sáb. 6/229:25 pmORD - STL
1 stop14h 05mSouthern / Mokulele
Deal found 6/10$142
dom. 6/1612:15 pmSTL - ORD
1 stop3h 35mSouthern / Mokulele
lun. 6/178:25 amORD - STL
1 stop11h 30mSouthern / Mokulele
Deal found 6/11$143
dom. 6/1612:00 pmSTL - ORD
1 stop19h 40mSouthern / Mokulele
mar. 6/1812:30 pmORD - STL
1 stop18h 30mSouthern / Mokulele
Deal found 6/11$148
jue. 6/2012:00 pmSTL - ORD
1 stop4h 10mSouthern / Mokulele
vie. 6/217:05 amORD - STL
1 stop5h 55mSouthern / Mokulele
Deal found 6/10$149

One-way flights to Illinois from St. Louis

Search for one-way flight options from St. Louis to Illinois. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 3,117,830 searches. Data last updated junio 11, 2024.
Some of the best available deals we've found on one-way flights from St. Louis to Illinois. Users in need of a round-trip flight from St. Louis to Illinois instead should update the search form at the top of page.
mar. 8/2712:15 pmSTL - ORD
1 stop3h 35mSouthern / Mokulele
Deal found 6/11$52
lun. 6/1712:15 pmSTL - ORD
1 stop3h 35mSouthern / Mokulele
Deal found 6/10$54
lun. 6/1712:15 pmSTL - ORD
1 stop3h 35mSouthern / Mokulele
Deal found 6/10$58
lun. 7/16:00 amSTL - ORD
Nonstop1h 22mAmerican Airlines
Deal found 6/10$59
dom. 6/1612:15 pmSTL - ORD
1 stop19h 25mSouthern / Mokulele
Deal found 6/10$60
dom. 6/3012:15 pmSTL - ORD
1 stop19h 25mSouthern / Mokulele
Deal found 6/10$61
dom. 6/3012:15 pmSTL - ORD
1 stop3h 35mSouthern / Mokulele
Deal found 6/10$62
mié. 7/3112:00 pmSTL - ORD
1 stop4h 10mSouthern / Mokulele
Deal found 6/10$63
sáb. 8/312:15 pmSTL - ORD
1 stop3h 35mSouthern / Mokulele
Deal found 6/10$64

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 3,117,830 searches. Data last updated junio 11, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$81 - $166

Route

Depart

Return

Price

Lambert-St LouisQuincy Regional

STL - UIN

STLUIN

Lambert-St Louis

jue. 8/22

Nonstop0h 50m

Quincy Regional

lun. 8/26

Nonstop0h 50m

$81

Lambert-St LouisQuincy Regional

STL - UIN

STLUIN

Lambert-St Louis

lun. 7/8

Nonstop0h 50m

Quincy Regional

lun. 7/15

Nonstop0h 50m

$86

Lambert-St LouisQuincy Regional

STL - UIN

STLUIN

Lambert-St Louis

mar. 7/30

Nonstop0h 50m

Quincy Regional

jue. 8/1

Nonstop0h 50m

$88

Lambert-St LouisChicago O'Hare Intl

STL - ORD

STLORD

Lambert-St Louis

dom. 6/30

Nonstop1h 22m

Chicago O'Hare Intl

mié. 7/3

Nonstop1h 17m

$108

Lambert-St LouisChicago O'Hare Intl

STL - ORD

STLORD

Lambert-St Louis

mar. 7/2

Nonstop1h 22m

Chicago O'Hare Intl

mar. 7/2

Nonstop1h 13m

$117

Lambert-St LouisChicago O'Hare Intl

STL - ORD

STLORD

Lambert-St Louis

vie. 6/21

1 stop3h 35m

Chicago O'Hare Intl

lun. 6/24

1 stop13h 09m

$141

Lambert-St LouisChicago O'Hare Intl

STL - ORD

STLORD

Lambert-St Louis

mar. 7/9

Nonstop1h 34m

Chicago O'Hare Intl

mar. 7/16

Nonstop1h 20m

$152

Lambert-St LouisChicago Midway

STL - MDW

STLMDW

Lambert-St Louis

mié. 7/10

1 stop5h 48m

Chicago Midway

mié. 7/17

1 stop3h 56m

$156

Lambert-St LouisChicago Midway

STL - MDW

STLMDW

Lambert-St Louis

vie. 6/21

1 stop10h 00m

Chicago Midway

mar. 6/25

1 stop8h 47m

$166

Flights are sorted by cheapest first

Deals found on 6/10

No data available for this route at this time. Please check back soon.

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.

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 junio 11, 2024.
Peruse reviews from past customers who have flown with Southern / Mokulele, American Airlines and United Airlines 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.
8.0
Very good
10,277 reviews

Entertainment

8.0

Food

7.4

Boarding

8.2

Crew

8.6

Comfort

7.9

Overall

8.0

Reviews

1 / 10

When I was going to board, one of the staff members told me that I could not board with my passport bag because it was tree items and I would need to check a bag. This was so stupid ! The bag was small. So I had to put my things in my pockets, put the funny bag inside the other bag. Then go throw it. Then in the plane put everything back again in my funny bag.

8.0
Very good
10,277 reviews
8.0
Very good
10,277 reviews

Entertainment

8.0

Food

7.4

Boarding

8.2

Crew

8.6

Comfort

7.9

Overall

8.0

Reviews

1 / 10

When I was going to board, one of the staff members told me that I could not board with my passport bag because it was tree items and I would need to check a bag. This was so stupid ! The bag was small. So I had to put my things in my pockets, put the funny bag inside the other bag. Then go throw it. Then in the plane put everything back again in my funny bag.

7.4
Good
10,629 reviews
8.0
Very good
10,277 reviews

Entertainment

8.0

Food

7.4

Boarding

8.2

Crew

8.6

Comfort

7.9

Overall

8.0

Reviews

1 / 10

When I was going to board, one of the staff members told me that I could not board with my passport bag because it was tree items and I would need to check a bag. This was so stupid ! The bag was small. So I had to put my things in my pockets, put the funny bag inside the other bag. Then go throw it. Then in the plane put everything back again in my funny bag.

7.3
Good
14,129 reviews
8.0
Very good
10,277 reviews

Entertainment

8.0

Food

7.4

Boarding

8.2

Crew

8.6

Comfort

7.9

Overall

8.0

Reviews

1 / 10

When I was going to board, one of the staff members told me that I could not board with my passport bag because it was tree items and I would need to check a bag. This was so stupid ! The bag was small. So I had to put my things in my pockets, put the funny bag inside the other bag. Then go throw it. Then in the plane put everything back again in my funny bag.

6.4
Okay
8,540 reviews
8.0
Very good
10,277 reviews

Entertainment

8.0

Food

7.4

Boarding

8.2

Crew

8.6

Comfort

7.9

Overall

8.0

Reviews

1 / 10

When I was going to board, one of the staff members told me that I could not board with my passport bag because it was tree items and I would need to check a bag. This was so stupid ! The bag was small. So I had to put my things in my pockets, put the funny bag inside the other bag. Then go throw it. Then in the plane put everything back again in my funny bag.

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.

  • Can I find flights from St. Louis to Illinois for under $100 on Cheapflights?

    Yes, there are multiple flights from St. Louis to Illinois for under $100. The cheapest flight booked recently is on Southern / Mokulele for just $81, but on average you can expect to pay $119.

  • Are there nonstop flights from St. Louis to Illinois for under $100 on Cheapflights?

    Cheapflights has at least 20 direct flights from St. Louis to Illinois under $100. A good price for a nonstop flight from St. Louis to Illinois is less than $150.

  • Are there last-minute flights available from St. Louis to Illinois for under $200?

    There are currently 20+ open flights from St. Louis to Illinois within the next 7 days for less than $200.

  • 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 $52. Users have also found prices from $59 and $70 on American Airlines and United Airlines, respectively.

  • What are the most popular routes 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: Sun Country Air (100%), Austrian Airlines (97%), Copa Airlines (96%).

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

    The cheapest flight price from St. Louis to Illinois is $117. On average you can expect to pay $1,300. The most popular route, (Lambert-St Louis - Chicago O'Hare Intl), can usually be booked for $117.

  • What does STL to ORD mean?

    These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Lambert-St Louis Airport to Chicago O'Hare Intl Airport flight would often be abbreviated as a STL to ORD flight. While you’re still figuring out your travel plans, it’s not a bad idea to learn the names and codes of other airports around these areas: Chicago Midway Airport (MDW), Moline Quad-City Airport (MLI), Greater Peoria Airport (PIA), Bloomington-Normal Airport (BMI), Springfield Capital Airport (SPI).

  • Can I find deals for flights from St. Louis to Illinois that include extra baggage allowance?

    The amount of baggage you can bring on your St. Louis to Illinois flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from St. Louis to Illinois with specific airlines?

    Yes, Cheapflights allows you to browse and filter St. Louis to Illinois flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • 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.

  • Can I find deals for flights from St. Louis to Illinois that allow pets onboard?

    Many airlines flying from St. Louis to Illinois offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from St. Louis to Illinois?

    Yes, you can often find last-minute deals on St. Louis to Illinois flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the St. Louis to Illinois flight deals updated?

    The St. Louis to Illinois flight deals you see on this page were last updated on 6/11.

  • What are the most popular airlines that fly from St. Louis to Illinois?

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

    Currently, February is the cheapest month in which you can book a flight from St. Louis to Illinois (average of $244). Flying from St. Louis to Illinois in July is currently the most expensive (average of $324). 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

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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.

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 3,117,830 searches. Data last updated junio 11, 2024.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$118Average$266FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$121Average$292FlexibilityNo cancel feeOn-time69%
Southern / MokuleleCheapest$131Average$172FlexibilityNo cancel feeOn-timeN/A
DeltaCheapest$238Average$300FlexibilityNo cancel feeOn-timeN/A

Search flights from St. Louis to Illinois by cabin class

Find flights from St. Louis to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Hourly flight availability from St. Louis to Illinois

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 junio 11, 2024.
7%of flight departuresEarly morningMidnight to 6 am
41%of flight departuresMorning6 am to noon
51%of flight departuresAfternoonNoon to 6 pm
1%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM
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