Cheap flights from St. Louis (STL) to Illinois from $44

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 7/6. 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 3 — Jun 101

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.

When is the cheapest time to fly from St. Louis to Illinois (STL - 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 Delta flights from St. Louis to Illinois

Explore cheap flight options specifically provided by Delta for the route between St. Louis and Illinois. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,765,679 searches. Data last updated May 29, 2024.
Take a peek at the cheapest Delta flights we've detected traveling from St. Louis to Illinois. Come back soon if you're not finding the exact deal you're looking for.
Tue 8/63:28 pmSTL - ORD
1 stop4h 09mDelta
Sat 8/101:31 pmORD - STL
2 stops9h 57mDelta
Deal found 5/29$161
Mon 7/15:25 pmSTL - MDW
1 stop4h 21mDelta
Thu 7/47:11 pmMDW - STL
1 stop4h 09mDelta
Deal found 5/28$186
Thu 7/45:26 pmSTL - ORD
1 stop3h 37mDelta
Tue 7/910:20 amORD - STL
2 stops11h 47mDelta
Deal found 5/28$192
Sun 8/256:30 amSTL - MDW
1 stop6h 12mDelta
Tue 8/277:20 pmMDW - STL
1 stop4h 08mDelta
Deal found 5/28$215
Tue 6/2511:25 amSTL - MDW
1 stop5h 39mDelta
Tue 7/27:11 pmMDW - STL
1 stop4h 09mDelta
Deal found 5/28$217
Mon 6/36:30 amSTL - MDW
1 stop6h 10mDelta
Wed 6/56:00 amMDW - STL
1 stop5h 48mDelta
Deal found 5/27$506
Tue 6/46:11 amSTL - ORD
2 stops6h 31mDelta
Sat 6/86:00 amORD - STL
1 stop5h 46mDelta
Deal found 5/29$511
Tue 6/43:27 pmSTL - MDW
1 stop6h 34mDelta
Sat 6/86:00 amMDW - STL
1 stop5h 46mDelta
Deal found 5/29$513
Tue 6/46:11 amSTL - ORD
2 stops6h 31mDelta
Tue 6/45:23 pmORD - STL
1 stop4h 11mDelta
Deal found 5/28$518

Cheap Spirit Airlines flights from St. Louis to Illinois

Explore cheap flight options specifically provided by Spirit Airlines for the route between St. Louis and Illinois. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,765,679 searches. Data last updated May 29, 2024.
Some of the best deals we've found on Spirit Airlines flights traveling from St. Louis to Illinois. Check back soon if you're not seeing flights that suit your needs.
Thu 6/276:22 pmSTL - ORD
1 stop15h 39mSpirit Airlines
Mon 7/16:40 pmORD - STL
1 stop19h 43mSpirit Airlines
Deal found 5/28$204
Wed 6/121:55 pmSTL - ORD
2 stops16h 05mSpirit Airlines
Wed 7/36:16 pmORD - STL
2 stops23h 12mSpirit Airlines
Deal found 5/27$243
Tue 6/42:35 pmSTL - ORD
3 stops25h 32mSpirit Airlines
Wed 6/59:37 pmORD - STL
2 stops19h 51mSpirit Airlines
Deal found 5/28$289
Sat 6/811:34 amSTL - ORD
3 stops22h 40mSpirit Airlines
Mon 6/106:40 pmORD - STL
2 stops16h 17mSpirit Airlines
Deal found 5/27$312
Sat 6/811:34 amSTL - ORD
3 stops22h 40mSpirit Airlines
Mon 6/1010:59 amORD - STL
3 stops23h 58mSpirit Airlines
Deal found 5/27$361

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

Find cheap flight options from St. Louis to Illinois specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,765,679 searches. Prices were last updated on May 29, 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.
Fri 6/214:45 pmSTL - UIN
Nonstop0h 50mSouthern / Mokulele
Mon 6/243:25 pmUIN - STL
Nonstop0h 50mSouthern / Mokulele
Deal found 5/28$82
Wed 6/196:00 amSTL - ORD
Nonstop1h 22mAmerican Airlines
Sat 6/228:45 pmORD - STL
Nonstop1h 17mAmerican Airlines
Deal found 5/28$99
Wed 6/266:00 amSTL - ORD
Nonstop1h 22mAmerican Airlines
Wed 6/264:05 pmORD - STL
Nonstop1h 13mAmerican Airlines
Deal found 5/28$108
Fri 6/1412:00 pmSTL - ORD
1 stop4h 10mSouthern / Mokulele
Fri 6/149:25 pmORD - STL
1 stop14h 05mSouthern / Mokulele
Deal found 5/28$116
Wed 5/2912:15 pmSTL - ORD
1 stop3h 35mSouthern / Mokulele
Thu 5/309:25 pmORD - STL
1 stop19h 20mSouthern / Mokulele
Deal found 5/27$117
Fri 6/216:08 pmSTL - ORD
Nonstop1h 22mAmerican Airlines
Mon 6/244:05 pmORD - STL
Nonstop1h 13mAmerican Airlines
Deal found 5/28$118
Fri 6/75:00 pmSTL - ORD
1 stop14h 40mSouthern / Mokulele
Sun 6/98:20 pmORD - STL
1 stop15h 25mSouthern / Mokulele
Deal found 5/28$119
Tue 6/412:00 pmSTL - ORD
1 stop4h 10mSouthern / Mokulele
Wed 6/59:25 pmORD - STL
1 stop14h 05mSouthern / Mokulele
Deal found 5/29$121
Fri 5/3112:00 pmSTL - ORD
1 stop4h 10mSouthern / Mokulele
Sun 6/29:25 pmORD - STL
1 stop14h 05mSouthern / Mokulele
Deal found 5/28$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 2,765,679 searches. Data last updated May 29, 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.
Fri 6/214:45 pmSTL - UIN
Nonstop0h 50mSouthern / Mokulele
Mon 6/243:25 pmUIN - STL
Nonstop0h 50mSouthern / Mokulele
Deal found 5/28$82
Tue 7/309:35 amSTL - UIN
Nonstop0h 50mSouthern / Mokulele
Thu 8/16:10 amUIN - STL
Nonstop0h 50mSouthern / Mokulele
Deal found 5/28$88
Wed 6/196:00 amSTL - ORD
Nonstop1h 22mAmerican Airlines
Sat 6/228:45 pmORD - STL
Nonstop1h 17mAmerican Airlines
Deal found 5/28$99
Wed 6/266:00 amSTL - ORD
Nonstop1h 22mAmerican Airlines
Wed 6/264:05 pmORD - STL
Nonstop1h 13mAmerican Airlines
Deal found 5/28$108
Fri 6/1412:00 pmSTL - ORD
1 stop4h 10mSouthern / Mokulele
Fri 6/149:25 pmORD - STL
1 stop14h 05mSouthern / Mokulele
Deal found 5/28$116
Wed 5/2912:15 pmSTL - ORD
1 stop3h 35mSouthern / Mokulele
Thu 5/309:25 pmORD - STL
1 stop19h 20mSouthern / Mokulele
Deal found 5/27$117
Fri 6/216:08 pmSTL - ORD
Nonstop1h 22mAmerican Airlines
Mon 6/244:05 pmORD - STL
Nonstop1h 13mAmerican Airlines
Deal found 5/28$118
Fri 6/75:00 pmSTL - ORD
1 stop14h 40mSouthern / Mokulele
Sun 6/98:20 pmORD - STL
1 stop15h 25mSouthern / Mokulele
Deal found 5/28$119
Thu 7/412:00 pmSTL - ORD
1 stop4h 10mSouthern / Mokulele
Sun 7/79:25 pmORD - STL
1 stop14h 05mSouthern / Mokulele
Deal found 5/27$120

Non-stop flights to Illinois from St. Louis

Discover non-stop flight options from St. Louis to Illinois. Find direct flights with no layovers, providing a convenient travel experience. Explore non-stop flight options based on user searches, and compare prices and availability for your desired travel dates. Over the last 7 days, Cheapflights users made 2,765,679 searches. Data last updated May 29, 2024.
For a shorter flight, select one of these non-stop flights from St. Louis to Illinois. Users can also choose from other St. Louis to Illinois flights by using the search form above.
Fri 6/214:45 pmSTL - UIN
Nonstop0h 50mSouthern / Mokulele
Mon 6/243:25 pmUIN - STL
Nonstop0h 50mSouthern / Mokulele
Deal found 5/28$82
Tue 7/309:35 amSTL - UIN
Nonstop0h 50mSouthern / Mokulele
Thu 8/16:10 amUIN - STL
Nonstop0h 50mSouthern / Mokulele
Deal found 5/28$88
Wed 6/196:00 amSTL - ORD
Nonstop1h 22mAmerican Airlines
Sat 6/228:45 pmORD - STL
Nonstop1h 17mAmerican Airlines
Deal found 5/28$99
Wed 6/266:00 amSTL - ORD
Nonstop1h 22mAmerican Airlines
Wed 6/264:05 pmORD - STL
Nonstop1h 13mAmerican Airlines
Deal found 5/28$108
Fri 6/216:08 pmSTL - ORD
Nonstop1h 22mAmerican Airlines
Mon 6/244:05 pmORD - STL
Nonstop1h 13mAmerican Airlines
Deal found 5/28$118
Tue 8/67:12 amSTL - ORD
Nonstop1h 23mAmerican Airlines
Fri 8/92:12 pmORD - STL
Nonstop1h 20mAmerican Airlines
Deal found 5/28$127
Wed 6/198:05 amSTL - ORD
Nonstop1h 34mUnited Airlines
Sat 6/2212:52 pmORD - STL
Nonstop1h 24mUnited Airlines
Deal found 5/29$137
Wed 6/126:00 amSTL - ORD
Nonstop1h 22mAmerican Airlines
Wed 7/39:05 amORD - STL
Nonstop1h 27mAmerican Airlines
Deal found 5/28$148
Fri 6/216:08 pmSTL - ORD
Nonstop1h 22mAmerican Airlines
Sun 7/214:06 pmORD - STL
Nonstop1h 13mAmerican Airlines
Deal found 5/28$177

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 2,765,679 searches. Data last updated May 29, 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.
Tue 6/412:00 pmSTL - ORD
1 stop4h 10mSouthern / Mokulele
Tue 6/49:25 pmORD - STL
1 stop14h 05mSouthern / Mokulele
Deal found 5/28$117
Fri 6/75:00 pmSTL - ORD
1 stop14h 40mSouthern / Mokulele
Sun 6/98:20 pmORD - STL
1 stop15h 25mSouthern / Mokulele
Deal found 5/28$119
Tue 6/412:00 pmSTL - ORD
1 stop4h 10mSouthern / Mokulele
Wed 6/59:25 pmORD - STL
1 stop14h 05mSouthern / Mokulele
Deal found 5/29$121
Tue 6/412:00 pmSTL - ORD
1 stop4h 10mSouthern / Mokulele
Wed 6/59:25 pmORD - STL
1 stop14h 05mSouthern / Mokulele
Deal found 5/28$122
Wed 6/512:15 pmSTL - ORD
1 stop3h 35mSouthern / Mokulele
Thu 6/68:20 pmORD - STL
1 stop15h 25mSouthern / Mokulele
Deal found 5/28$123
Mon 6/312:00 pmSTL - ORD
1 stop4h 10mSouthern / Mokulele
Wed 6/59:25 pmORD - STL
1 stop14h 05mSouthern / Mokulele
Deal found 5/27$124
Fri 6/712:00 pmSTL - ORD
1 stop19h 40mSouthern / Mokulele
Sun 6/99:25 pmORD - STL
1 stop19h 20mSouthern / Mokulele
Deal found 5/29$127
Wed 6/512:15 pmSTL - ORD
1 stop19h 25mSouthern / Mokulele
Sat 6/87:05 amORD - STL
1 stop5h 00mSouthern / Mokulele
Deal found 5/27$149
Tue 6/412:00 pmSTL - ORD
1 stop4h 10mSouthern / Mokulele
Sat 6/89:25 pmORD - STL
1 stop14h 05mSouthern / Mokulele
Deal found 5/29$151

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 2,765,679 searches. Data last updated May 29, 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.
Sat 7/69:35 amSTL - UIN
Nonstop0h 50mSouthern / Mokulele
Deal found 5/27$44
Wed 6/196:00 amSTL - ORD
Nonstop1h 22mAmerican Airlines
Deal found 5/28$50
Sun 7/712:15 pmSTL - ORD
1 stop3h 35mSouthern / Mokulele
Deal found 5/28$54
Tue 8/1312:15 pmSTL - ORD
1 stop3h 35mSouthern / Mokulele
Deal found 5/28$55
Tue 6/412:15 pmSTL - ORD
1 stop3h 35mSouthern / Mokulele
Deal found 5/28$56
Thu 6/612:00 pmSTL - ORD
1 stop4h 10mSouthern / Mokulele
Deal found 5/29$57
Wed 7/176:09 pmSTL - ORD
Nonstop1h 20mAmerican Airlines
Deal found 5/28$59
Tue 8/137:12 amSTL - ORD
Nonstop1h 23mAmerican Airlines
Deal found 5/28$60
Wed 7/3112:00 pmSTL - ORD
1 stop4h 10mSouthern / Mokulele
Deal found 5/28$63

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 2,765,679 searches. Data last updated May 29, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$82 - $210

Route

Depart

Return

Price

Lambert-St LouisQuincy Regional

STL - UIN

STLUIN

Lambert-St Louis

Fri 6/21

Nonstop0h 50m

Quincy Regional

Mon 6/24

Nonstop0h 50m

$82

Lambert-St LouisQuincy Regional

STL - UIN

STLUIN

Lambert-St Louis

Tue 7/30

Nonstop0h 50m

Quincy Regional

Thu 8/1

Nonstop0h 50m

$88

Lambert-St LouisChicago O'Hare Intl

STL - ORD

STLORD

Lambert-St Louis

Wed 6/19

Nonstop1h 22m

Chicago O'Hare Intl

Sat 6/22

Nonstop1h 17m

$99

Lambert-St LouisChicago O'Hare Intl

STL - ORD

STLORD

Lambert-St Louis

Wed 6/26

Nonstop1h 22m

Chicago O'Hare Intl

Wed 6/26

Nonstop1h 13m

$108

Lambert-St LouisChicago O'Hare Intl

STL - ORD

STLORD

Lambert-St Louis

Wed 6/19

Nonstop1h 34m

Chicago O'Hare Intl

Sat 6/22

Nonstop1h 24m

$137

Lambert-St LouisChicago O'Hare Intl

STL - ORD

STLORD

Lambert-St Louis

Sun 8/4

1 stop3h 35m

Chicago O'Hare Intl

Tue 8/27

1 stop7h 28m

$140

Lambert-St LouisChicago O'Hare Intl

STL - ORD

STLORD

Lambert-St Louis

Tue 8/6

1 stop4h 09m

Chicago O'Hare Intl

Sat 8/10

2 stops9h 57m

$161

Lambert-St LouisChicago O'Hare Intl

STL - ORD

STLORD

Lambert-St Louis

Thu 6/27

1 stop15h 39m

Chicago O'Hare Intl

Mon 7/1

1 stop19h 43m

$204

Lambert-St LouisChicago O'Hare Intl

STL - ORD

STLORD

Lambert-St Louis

Tue 7/9

2 stops13h 30m

Chicago O'Hare Intl

Thu 7/11

1 stop11h 40m

$210

Flights are sorted by cheapest first

Deals found on 5/28

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 May 29, 2024.
Peruse reviews from past customers who have flown with Delta, Spirit Airlines and American 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.
Southwest
8.2
Very good
5,963 reviews

Crew

8.7

Comfort

8.1

Food

7.3

Overall

8.2

Entertainment

7.8

Boarding

8.3

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

Southwest
8.2
Very good
5,963 reviews
Southwest
8.2
Very good
5,963 reviews

Crew

8.7

Comfort

8.1

Food

7.3

Overall

8.2

Entertainment

7.8

Boarding

8.3

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

8.0
Very good
10,457 reviews
Southwest
8.2
Very good
5,963 reviews

Crew

8.7

Comfort

8.1

Food

7.3

Overall

8.2

Entertainment

7.8

Boarding

8.3

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

7.5
Good
2,866 reviews
Southwest
8.2
Very good
5,963 reviews

Crew

8.7

Comfort

8.1

Food

7.3

Overall

8.2

Entertainment

7.8

Boarding

8.3

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

7.4
Good
10,784 reviews
Southwest
8.2
Very good
5,963 reviews

Crew

8.7

Comfort

8.1

Food

7.3

Overall

8.2

Entertainment

7.8

Boarding

8.3

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

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 $82, but on average you can expect to pay $118.

  • 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 $167.

  • 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 days are nonstop flights available from St. Louis to Illinois?

    You can find nonstop flights on the following days: Sunday, Friday, Saturday.

  • How many flights depart from St. Louis to Illinois on average per day?

    On average 12 flights depart from St. Louis to Illinois per day.
    Early Morning (Midnight to 6am) - 17% of flight departures
    Morning (6am - Noon) - 83% of flight departures

  • How long is the flight from St. Louis to Illinois?

    A quick flight from St. Louis to Illinois can take about 50m. Southern / Mokulele provides one of the quickest options available for as low as $82. St. Louis and Illinois are separated by a distance of 259 mi. All flights are typically nonstop.

  • 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 $44. Users have also found prices from $50 and $78 on American Airlines and Delta, 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%), Copa Airlines (100%), Austrian Airlines (98%).

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

    The cheapest flight price from St. Louis to Illinois is $108. On average you can expect to pay $1,878. The most popular route, (Lambert-St Louis - Chicago O'Hare Intl), can usually be booked for $114.

  • 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 5/29.

  • 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 June is currently the most expensive (average of $326). 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 2,765,679 searches. Data last updated May 29, 2024.
AirlineCheapestAverageFlexibilityOn-time
Southern / MokuleleCheapest$106Average$170FlexibilityNo cancel feeOn-timeN/A
Search Southern / Mokulele flights
American AirlinesCheapest$121Average$266FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
United AirlinesCheapest$130Average$291FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
DeltaCheapest$238Average$300FlexibilityNo cancel feeOn-timeN/A
Search Delta flights

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 May 29, 2024.
16%of flight departuresEarly morningMidnight to 6 am
48%of flight departuresMorning6 am to noon
36%of flight departuresAfternoonNoon to 6 pm
0%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from St. Louis to Illinois?

Cheapflights helps you search for flights from St. Louis to Illinois via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from St. Louis to Illinois?

Millions of users choose and trust Cheapflights to book the best flight deals from St. Louis to Illinois for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from St. Louis to Illinois with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from St. Louis to Illinois flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from St. Louis to Illinois become cheaper?

Not ready to book yet? You can track prices for flights from St. Louis to Illinois on Cheapflights with our Price Alert feature and get notified when better prices are available.

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