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Find cheap flights from St. Louis to Illinois from $44

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 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.
1 adult
0 bags
Thu 6/27
Thu 7/4

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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$108
Quincy
Quincynonstop$84

Good to know

Low season

January

High season

October

Cheapest flight

$44
Best time to beat the crowds but there is an average 56% increase in price.
Most popular time to fly and prices are also 10% 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 $202 one-way - $541 round-trip
  • Morning departure is around 4% cheaper 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 10502 reviews
7.9Comfort
7.4Food
8.2Boarding
8.0Entertainment
8.6Crew
Airline reviews

Flew first class so everything was great. But maybe because the flights were red eye, no meals were served, just chips. I flew Alaska Air 1st class at 9PM (2 hour flight) and they served beef short rib sliders!

10.0 ExcellentMichael, May 2024SJC - ATL
Read more about Delta reviews

Flew first class so everything was great. But maybe because the flights were red eye, no meals were served, just chips. I flew Alaska Air 1st class at 9PM (2 hour flight) and they served beef short rib sliders!

Had to change aircraft due to a faulty door. Surprisingly it only caused about an hour and a half of delay. Delta handled this situation as well as can be expected.

Awful. Flight was continuously getting delayed and gates kept changing without any reason. Flight was delayed for more then 3 hours

Paid premium for Delta only to be on safe but tired old 767 with ancient cabin in mediocre condition. Poor wifi and horrible inflight entertainment. Hardly a premium experience. Should have flown SW and had fun flight crew and no pretense

Our flight to Zurich was delayed by almost 3 hours, so we missed our next flight. There was no indication it would be delayed this much. We were told the gate had changed and then it apparently took over 2 hours to load the "catering" on the plane. We were not compensated in any way for the trouble.

Rated entertainment as Mediocre as there were major problems with the Infotainment system that took probably a half hour for them to fix.

Your crew could maybe answer the call bell at least one of the times I pressed it. I pressed it first time with 2.5 hours left in our flight bc my partner was hungry and wanted a sandwich. We finally got the sandwich with 40 mins left in the flight.

Delta crushed it. Flight attendant in first was attentive and just never stopped. Honestly one of the best domestic flights I’ve been on.

They were an hour late and they didn’t have my wheelchair for me

The Flight crew didn’t serve us until about 1.5 hours into the flight because of turbulence but after it ended it was fine to move around. They served us water only and snacks and then NEVER, NOT ONE TIME came through to collect trash until right before landing about 1.5 hours later. There was absolutely no need for that. They crew was just standing around talking and visiting with each other and really never tried to see if we might want something besides water or even try to come pick up trash. This is VERY unusual for a Delta flight but it was not what I would have expected for a 4 hour flight.

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.

The CX617 from HK to BKK was delayed more than 1.5 hours.

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.

Crew was nice, explained emergency protocol very well. Flight took off and arrived on time. Pilot explained the small delay that occurred with docking and providing updates. I would definitely fly spirit again.

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.

It was ridiculously hard to check in for the flight, and Frontier charged us a LOT of money to have a carry on suitcase, and then told everyone we could not carry on bags and had to check them through at the gate, and didn't refund the extra money we paid to have the suitcase as carry on.

I had a terrible experience with Frontier. I arrived before the 60 minute cut off and was told that Frontier has a two hour window for bags. I was then told the next available flight wasn’t until the end of the day (I had booked a 6am flight). I took a look around and saw other people being told that they could not board their flights or that they had to pay additional fees. I opted to rebook on American Airlines. There’s absolutely no straightforward way to contact Frontier, so this ticket was a complete waste of money. Oh - and the kicker is that the lady lied about the two hour cut off.

Frontier won’t help you at the airport without paying $25. Carry on was $75. Then you get on the plain and every beverage or snack is also a charge. Seats are hard and real packed in. I would never fly them again.

Worst experience I have seen. The flight was cancelled without any reason.

My experience with frontier staff at the Denver airport was absolutely horrible. The manager on duty was even worst if was the worst experience I have ever had, I have never been treated so poorly as a customer in my life! The staff was extremely rude, eye rolls and attitude and then refusal to help me at all. I wish I could never fly frontier again that’s how horrible it was!

The Frontier app wasn’t working. So I could not pay for a carry on the week prior to flying. They charged me 99$ at the gate to carry on a duffle bag.

Good for the price. My only complaint is that the pilot should keep the air flowing while passengers are waiting to getting out of airplane.

Plane could have been more on time. More leg room .

I arrived 1 hour prior to boarding, and they said I was too late for a domestic flight. First time I heard that :-(

Check in online was easy. Seats aren’t very comfortable

Book cheap flights from St. Louis to Illinois

Recent round-trip flight deals

7/30Tue
nonstopSouthern / Mokulele
0h 50mSTL-UIN
8/6Tue
nonstopSouthern / Mokulele
0h 50mUIN-STL
$84
7/30Tue
nonstopSouthern / Mokulele
0h 50mSTL-UIN
8/2Fri
nonstopSouthern / Mokulele
0h 50mUIN-STL
$88
6/26Wed
nonstopAmerican Airlines
1h 22mSTL-ORD
6/26Wed
nonstopAmerican Airlines
1h 13mORD-STL
$108
6/18Tue
nonstopAmerican Airlines
1h 22mSTL-ORD
6/20Thu
nonstopAmerican Airlines
1h 13mORD-STL
$118
7/24Wed
nonstopUnited Airlines
1h 29mSTL-ORD
7/31Wed
nonstopUnited Airlines
1h 23mORD-STL
$137
6/25Tue
1 stopDelta
5h 39mSTL-MDW
6/29Sat
1 stopDelta
3h 32mMDW-STL
$156
6/30Sun
nonstopUnited Airlines
1h 34mSTL-ORD
7/4Thu
nonstopUnited Airlines
1h 27mORD-STL
$168
6/25Tue
1 stopDelta
6h 13mSTL-MDW
7/1Mon
1 stopDelta
6h 00mMDW-STL
$186
8/15Thu
1 stopSpirit Airlines
23h 03mSTL-ORD
8/20Tue
2 stopsSpirit Airlines
35h 41mORD-STL
$230
6/12Wed
2 stopsSpirit Airlines
16h 05mSTL-ORD
7/3Wed
2 stopsSpirit Airlines
23h 12mORD-STL
$243

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Recent one-way flight deals

7/6Sat
nonstopSouthern / Mokulele
0h 50mSTL-UIN
$44
6/20Thu
nonstopAmerican Airlines
1h 22mSTL-ORD
$50
8/27Tue
1 stopSouthern / Mokulele
3h 35mSTL-ORD
$53
8/27Tue
2 stopsSpirit Airlines
18h 58mSTL-ORD
$73
8/27Tue
3 stopsSpirit Airlines
22h 33mSTL-ORD
$75
8/27Tue
1 stopDelta
6h 02mSTL-MDW
$78
8/14Wed
1 stopDelta
4h 14mSTL-ORD
$78
9/19Thu
1 stopFrontier
11h 04mSTL-MDW
$119
6/20Thu
1 stopFrontier
9h 45mSTL-MDW
$137
7/5Fri
2 stopsUnited Airlines
12h 27mSTL-ORD
$533

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Last minute flights from St. Louis to Illinois

Last minute flight, train and bus deals

5/31Fri
multi-stopSouthern / Mokulele
3h 35mSTL-ORD
6/2Sun
multi-stopSouthern / Mokulele
14h 05mORD-STL
$114
5/29Wed
multi-stopSouthern / Mokulele
3h 35mSTL-ORD
5/30Thu
multi-stopSouthern / Mokulele
14h 05mORD-STL
$117
5/31Fri
multi-stopSouthern / Mokulele
3h 35mSTL-ORD
6/2Sun
multi-stopSouthern / Mokulele
14h 05mORD-STL
$121
5/30Thu
multi-stopSpirit Airlines
21h 05mSTL-ORD
6/4Tue
multi-stopSpirit Airlines
32h 05mORD-STL
$374
5/28Tue
nonstopUnited Airlines
1h 34mSTL-ORD
6/4Tue
nonstopUnited Airlines
1h 21mORD-STL
$437
5/28Tue
nonstopAmerican Airlines
1h 16mSTL-ORD
6/4Tue
multi-stopAmerican Airlines
4h 40mORD-STL
$445
5/30Thu
nonstopAmerican Airlines
1h 17mSTL-ORD
6/1Sat
nonstopAmerican Airlines
1h 20mORD-STL
$452
5/30Thu
nonstopUnited Airlines
1h 24mSTL-ORD
6/2Sun
nonstopUnited Airlines
1h 24mORD-STL
$467
5/28Tue
multi-stopDelta
6h 10mSTL-MDW
5/30Thu
multi-stopDelta
5h 48mMDW-STL
$471
5/30Thu
multi-stopDelta
6h 31mSTL-ORD
6/1Sat
multi-stopDelta
4h 11mORD-STL
$476

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St. Louis - Illinois Flights

Departure:

St. Louis (STL)United States

Return flight deals:

Illinois - St. Louis

Cabin classes:

$842
$2,394
$1,305
$106