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Find cheap flights from St. Louis to Illinois from $40

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Illinois departing on 5/24. 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.
1 adult
0 bags
Fri 5/31
Fri 6/7

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Best Illinois Flight Deals

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours

Chicago
Chicagononstop$107
Quincy
Quincynonstop$58

Good to know

Low season

January

High season

October

Cheapest flight

$40
Best time to beat the crowds but there is an average 5% increase in price.
Most popular time to fly and prices are also 8% lower on average.
Flight from St. Louis to Quincy

FAQs - booking Illinois flights

  • How does KAYAK find such low prices on flights from St. Louis to Illinois?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from St. Louis to Illinois.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to Illinois?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Illinois from St. Louis is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from St. Louis to Illinois?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Illinois with an airline and back to St. Louis with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to Illinois?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Illinois from St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top tips for finding cheap flights to Illinois

  • Looking for a cheap flight? 25% of our users found tickets from St. Louis to the following destinations at these prices or less: Chicago $215 one-way - $608 round-trip
  • Morning departure is around 21% more expensive than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

Top 5 airlines serving from St. Louis to Illinois

 
Need help choosing which airline to fly with from St. Louis to Illinois? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
DeltaOverall score based on 10895 reviews
8.0Entertainment
7.4Food
8.2Boarding
7.9Comfort
8.6Crew
Airline reviews

Delayed due to an ill passenger after loading. Not preventable on Delta's part. Was in first class. The seats are becoming worn and detaching from their velcro attachments. Only got snacks on flight. The attendant was not the friendliest.

6.0 GoodJames, Apr 2024TPA - RDU
Read more about Delta reviews

Delayed due to an ill passenger after loading. Not preventable on Delta's part. Was in first class. The seats are becoming worn and detaching from their velcro attachments. Only got snacks on flight. The attendant was not the friendliest.

I would fly again the whole experience was great. The only feed back I can give that they don't do that American Airlines does is the crew there is more humorous with boarding and thank their passengers. It makes it more fun to fly with them. I would however fly Delta again.

From Atlanta to Cabo I would have hoped on a plane that size I would have been able to breathe and wiggle my feet a little! The leg room in that plane is non existent and I am only 5”4’. And the air vent either wasn’t working very well or just could not blow air from the ceiling to the seat area as I was suffocating through the entire flight! And please don’t say I would have been more comfortable in first class because I cannot afford those rates and have always travelled Main Cabin without issues !

The pilots were good. Disappointing when planes don't have electrical ports

I liked the piloting of the aircraft. Very disappointed about lack of electrical ports. Also, although a short flight. there was enough time to hand out snacks to comfort + seats as was done for first class.

I had a wonderful experience flying with delta. The gentleman taking care of us on our flight was so nice, accommodating, and attentive. He always was smiling and giving pins to the kids which made me smile. The flight was quick too and without turbulence. Thank you for the great flying experience.

Delta is one of the best airlines I have flown

Made the Atlanta to Pittsburgh trip many times, with Delta no issues

I always fly with Delta. My friends tell me their horror stories of flying with other airlines. I just smile and say, “You should fly Delta”

I'm a larger, athletic guy (6'2", 260lbs powerlifter) and I found the seats incredibly uncomfortable with minimal leg room, especially in a window seat. Now, I full understand that being smaller may change my view but even if I was 80lbs less, my legs would be the same size and I was sandwiched between my seat and the seat in front of me.

The overall flight went well and the aircrew was pleasant.

Very comfortable Prem economy seats for a long haul flight. Had a problem with the tv that the crew fixed so was great!

Cathay Pacific seems to be an airline in trouble and on its way out. Lots of broken or poorly functioning things like entertainment screens, seats, and enough well trained staff to handle a full flight. Sad...

The flight crew was exceptionally good. Personal needs were well met. The food choices were very nice.

Excellent. Planes are a little older and could get some refurbishment, but besides that everything was excellent.

While I was in great pain, the seat was sufficiently comfortable to allow me to rest and not be in so much pain.

we were upgraded which was a blessing and tender mercy for us. I fell the day before and was in extreme pain from knee to shoulder. Sitting in a more comfortable seat during the flight was an unexpected blessing and experience.

Seats were very comfortable. Crew were excellent. Food very good.

Flight crew was especially thoughtful and attentive, made sure our seats were comfortable so we could rest on the long flight

I felt thirsty and asked the flight attendent for water, but no one came for more than half an hour.

I was told we'd have a hot breakfast option in first class, so I chose not get a hot breakfast. It was a very strange meal, but the fresh fruit was very good quality. Service was excellent from ORD to ELP. No service from MBS to ORD, not even water. However, when flying American from FNT to ORD, which is a shorter flight, they at least pass out snacks and offer water.

The delays (5 hrs) were a comedy of errors, and the multiple safety issues encountered were very concerning.

The flight was delayed instead of leaving at 11 it left at 12.20

United WiFi is consistently unusable (it can take 10 mins to load a single web page). If you need Wifi to do work, be prepared to lose half a day of productivity.

Good movies, iffy pay WiFi, food ok- on time though and that was great!

Awful…flight was delayed more than 12hrs, missed all connections to Fort Wayne, IN, had to get flight to another city 2 hours from my destination, flight was again delayed by 40 mins because they did not have enough fuel, again missed a connection, finally arrived in Indiana at 11pm…but before my 2 hour drive home, ay, no Five That Our Luggage Never Made On The plane and Still In Chicago

Boarding was friendly and quick. While the plane model was older with no live tv, the entertainment was full of movies and tv shows. All food was available. Pilots were very communicative with status of the flight. Flight landed on time.

Flight was delayed by over an hour and gate checked bags took 15 minutes to be delivered to the jet bridge.

The Palm Springs to Chicago O’Hare was on Time and Palm Springs airport is easier navigate. As our connection was only an approximately 50 minutes, we asked staff for insights for the Chicago airport in terms of transferring into the other terminal from which our flight left, and they were unhelpful. However, the United App was very helpful in terms of notifications and even providing directions. The Chicago to Detroit flight was significantly delayed which we all know does happen. However, there were very few updates or notifications as to why this was happening when we would actually arrive. It took nearly 30 minutes for bags to make it to baggage claim. We arrived nearly 1 hour late on a 40 minute flight.

Flight cancelled due to fog. No other flights available for 36 hours. Directed by United to book passage on another carrier, and submit receipts for reimbursement. Did that. United now states they will not reimburse. Currently out 2 grand.

This flight is frequently delayed. The connections seemingly are more frequently delayed. I’ve missed connections as a result twice on the same route to charlotte then Charleston. Final destination arrival has been the next day, twice in a row. No pilots, no crew. Too many excuses. Unfortunately, my days with American are over.

Entertainment was okay not because anything was wrong but it is a short flight so having no wifi is annoying but understandable. Crew was outstanding as usual

Those seats were way too narrow. I had the middle seat, one person was a very skinny person and we still couldn’t avoid touching each other anytime one of us moved. The other person was larger and we were basically sitting in each others lap the entire flight. There was zero entertainment. The flight was long enough to justify tvs, but no. Gotta sit there in your infant seat and twiddle your thumbs.

Flight was fine. It took an unusually long time to have baggage delivered to the carousel in ORD.

American Airlines continues to price it can provide the least comfortable passenger experience in the air. This legacy carrier rivals the budgets for both terrible seats and inadequate amenities. I am a 5’7” woman who is not wider than a coach seat (even on these narrow bodied aircraft). My 3.5 hour flight was terribly uncomfortable because the leg room is inadequate (my knees hit the seat on front of me even when it was not reclined); the seat barely reclines; and the foam padding is worn thin to the extent one can feel the metal supports of the seat. Add to this the fact that the aisle is super narrow, so that the drink cart literally scrapes the arm rest of the aisle seat. It’s basically torture.

Average - flew with Jet Blue internal and it was far more comfortable and better food and entertainment. Notable difference

The flight got canceled due to mechanical issues, and he to be rebooked and missed my appointments for that day

The flight was scheduled to depart DCA at 12:30 pm but was delayed twice on the ground so that we were finally scheduled to depart at around 4:00 pm. Once we boarded, it was announced that takeoff would be delayed again to fix a hydraulic problem which delayed our eventual takeoff until around 5:00 pm. Once we departed, it was a smooth flight back to ORD. We did not get any explanation about what caused the original significant delay. In my experience, this happens frequently with AA.

The only problem experienced was a ground stop in Chicago due to weather. But the crew handled everything professionally. They prioritized rebooking those passengers who had connecting flights and then deplaning the other passengers. When the hold was lifted, they efficiently re-boarded all the passengers so that we could depart before our departure limit expired.

Our second leg to Jackson WY was unable to land due to weather. We were flown back to Dallas after stopping in SLC. We were given hotel rooms and vouchers. We were told that we would be back on the same plane in the morning. Instead we were given a different flight with different seats. Not a good experience. No one knew what was going on.

The seat are terrible. Don’t even think of sleeping on a Spirit flight. The kids that run the plane aka flight attendants are pretty rude and straight forward. They get the job done but without class.

I had a death in my family and booked my flight on Spirit. My flight was cancelled the morning of my flight, no explanation, no help to rebook, nobody to talk to. The next available flight was 2days later !!!! Terrible airline, will NEVER fly with them again!

They took a horrible route with a lot of turbulence and I eneded up getting sick. Even if the flight takes longer. Don't put people life at risk just to get to the airport on time.

Every thing was fine ,low price,easy on time ,clean, good staff, really no issues

Had to board plan 2x due to lack of security check after 1st boarding

Miserable. The crew was rude, the flight was delayed 5 hours for mechanical reasons and then “weather” even though other planes were leaving.

They kept Changing the flight times. It was delayed several times and at one point it was supposed to depart at 3.40am! At which point we ended up staying overnight and booked long a separate United flight for early morning departure. The spirit flight then got moved up and left at 1.30 in the morning when it was supposed to leave at 9.40pm the night before.

Flight was delayed...not horribly late. Just before push back engine shut down for a quick replacement item that took about five minutes. After that, everything was smooth and the pilot was able to make up time in the air so that our arrival time was not too far off the original anticipated arrival time.

The flight was delayed almost two hours on the front end, and an hour on the backend once we landed and waited for a gate to open up. We were told to remain in our seats during that whole delay and I had to go to the bathroom badly. I was unable to hold it and was forced to urinate in my pants while in my seat. I then had to sit in it until we finally deboarded and I was able to change my clothes.

We waited an hour to get off of the plane

Book cheap flights from St. Louis to Illinois

Recent round-trip flight deals

5/18Sat
nonstopSouthern / Mokulele
0h 50mSTL-UIN
5/20Mon
nonstopSouthern / Mokulele
0h 50mUIN-STL
$58
10/1Tue
nonstopUnited Airlines
1h 21mSTL-ORD
10/12Sat
nonstopUnited Airlines
1h 22mORD-STL
$107
5/30Thu
nonstopAmerican Airlines
1h 19mSTL-ORD
6/3Mon
nonstopAmerican Airlines
1h 23mORD-STL
$117
5/25Sat
nonstopAmerican Airlines
1h 16mSTL-ORD
5/26Sun
nonstopAmerican Airlines
1h 13mORD-STL
$138
5/11Sat
2 stopsSpirit Airlines
13h 39mSTL-ORD
5/14Tue
2 stopsSpirit Airlines
27h 46mORD-STL
$144
6/1Sat
1 stopDelta
4h 51mSTL-MDW
6/1Sat
1 stopDelta
4h 52mMDW-STL
$156
5/28Tue
1 stopDelta
5h 25mSTL-ORD
6/4Tue
1 stopDelta
5h 03mORD-STL
$156
5/23Thu
1 stopSpirit Airlines
15h 36mSTL-ORD
5/25Sat
2 stopsSpirit Airlines
22h 22mORD-STL
$196
5/16Thu
1 stopFrontier
10h 27mSTL-MDW
5/20Mon
1 stopFrontier
13h 03mMDW-STL
$198
5/21Tue
1 stopFrontier
10h 27mSTL-MDW
5/23Thu
1 stopFrontier
11h 14mMDW-STL
$207

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Recent one-way flight deals

5/24Fri
nonstopSouthern / Mokulele
0h 50mSTL-UIN
$40
5/7Tue
1 stopSpirit Airlines
13h 46mSTL-ORD
$45
5/26Sun
nonstopAmerican Airlines
1h 17mSTL-ORD
$46
5/26Sun
1 stopDelta
4h 51mSTL-MDW
$78
5/25Sat
1 stopDelta
3h 26mSTL-ORD
$78
5/28Tue
nonstopAmerican Airlines
1h 16mSTL-ORD
$93
5/20Mon
1 stopFrontier
10h 27mSTL-MDW
$99
9/19Thu
1 stopFrontier
11h 04mSTL-MDW
$119
5/7Tue
nonstopUnited Airlines
1h 31mSTL-ORD
$216
9/14Sat
2 stopsUnited Airlines
14h 13mSTL-ORD
$284

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Last minute flights from St. Louis to Illinois

Last minute flight, train and bus deals

5/4Sat
multi-stopSouthern / Mokulele
21h 50mSTL-ORD
5/11Sat
multi-stopSouthern / Mokulele
14h 05mORD-STL
$157
5/5Sun
multi-stopSouthern / Mokulele
22h 15mSTL-ORD
5/11Sat
multi-stopSouthern / Mokulele
14h 05mORD-STL
$158
5/4Sat
multi-stopFrontier
12h 27mSTL-MDW
5/8Wed
multi-stopFrontier
11h 19mMDW-STL
$288
5/4Sat
multi-stopFrontier
12h 27mSTL-MDW
5/6Mon
multi-stopFrontier
11h 19mMDW-STL
$318
5/4Sat
nonstopUnited Airlines
1h 31mSTL-ORD
6/4Tue
nonstopUnited Airlines
1h 21mORD-STL
$322
5/4Sat
multi-stopAmerican Airlines
7h 08mSTL-ORD
6/4Tue
nonstopAmerican Airlines
1h 23mORD-STL
$346
5/4Sat
nonstopUnited Airlines
1h 20mSTL-ORD
5/11Sat
nonstopUnited Airlines
1h 22mORD-STL
$431
5/4Sat
nonstopAmerican Airlines
1h 21mSTL-ORD
5/11Sat
multi-stopAmerican Airlines
7h 15mORD-STL
$439
5/4Sat
multi-stopDelta
4h 29mSTL-MDW
5/8Wed
multi-stopDelta
4h 01mMDW-STL
$450
5/4Sat
multi-stopDelta
10h 18mSTL-MDW
5/8Wed
multi-stopDelta
4h 01mMDW-STL
$455

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St. Louis - Illinois Flights

Departure:

St. Louis (STL)United States

Return flight deals:

Illinois - St. Louis

Cabin classes:

$554
$393
$1,760
$84