$98 Find Cheap Flights from Knoxville to Illinois

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Knoxville to Illinois departing on 3/2. 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
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Illinois

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Knoxville to Illinois, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Knoxville to Illinois, as well as popular online travel agencies
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Cheap Flights from Knoxville to Illinois

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Chicago
Chicagononstop$189
Moline
Moline1 stop$349
Peoria
Peoria1 stop$249
St. Louis
St. Louis1 stop$203
Chicago
Chicagononstop$189
Moline
Moline1 stop$349
Peoria
Peoria1 stop$249
St. Louis
St. Louis1 stop$203

Book Cheap Knoxville to Illinois Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Knoxville to Illinois that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Knoxville to Illinois

Fri, May 1 - Sat, May 9
American Airlines Logo
7:33 pm - 8:40 pm
TYS
-
ORD
2h 07mnonstop
American Airlines Logo
6:46 pm - 9:35 pm
ORD
-
TYS
1h 49mnonstop
$189American Airlines
Tue, Mar 17 - Tue, Mar 24
Multiple Airlines Logo
3:00 pm - 10:36 am
TYS
-
ORD
20h 36m
1 stop
Multiple Airlines Logo
6:36 pm - 10:40 am
ORD
-
TYS
15h 04m
1 stop
$194Multiple Airlines
Mon, Mar 2 - Wed, Mar 4
Multiple Airlines Logo
9:36 pm - 11:47 am
TYS
-
ORD
15h 11m
2 stops
Multiple Airlines Logo
10:44 am - 6:26 pm
ORD
-
TYS
6h 42m
1 stop
$197Multiple Airlines
Sun, Jun 28 - Sun, Jul 5
United Airlines Logo
6:30 am - 7:29 am
TYS
-
ORD
1h 59mnonstop
United Airlines Logo
2:12 pm - 5:01 pm
ORD
-
TYS
1h 49mnonstop
$198United Airlines
Fri, May 1 - Sun, May 3
United Airlines Logo
7:00 am - 7:56 am
TYS
-
ORD
1h 56mnonstop
United Airlines Logo
6:00 pm - 8:45 pm
ORD
-
TYS
1h 45mnonstop
$204United Airlines
Thu, Feb 26 - Mon, Mar 2
Delta Logo
1:00 pm - 5:37 pm
TYS
-
MDW
5h 37m
1 stop
Delta Logo
1:29 pm - 8:55 pm
MDW
-
TYS
6h 26m
1 stop
$209Delta
Fri, May 1 - Sun, May 3
Delta Logo
5:54 pm - 9:25 pm
TYS
-
ORD
4h 31m
1 stop
Delta Logo
9:48 am - 5:08 pm
ORD
-
TYS
6h 20m
1 stop
$209Delta
Tue, Mar 31 - Sat, Apr 4
Southwest Logo
7:50 am - 4:25 pm
TYS
-
MDW
9h 35m
2 stops
Southwest Logo
7:45 am - 1:10 pm
MDW
-
TYS
4h 25m
1 stop
$214Southwest
Wed, Apr 22 - Sat, Apr 25
Southwest Logo
7:05 am - 3:25 pm
TYS
-
MDW
9h 20m
2 stops
Southwest Logo
9:15 am - 6:30 pm
MDW
-
TYS
8h 15m
2 stops
$219Southwest
Sun, Feb 15 - Thu, Feb 19
Allegiant Air Logo
12:54 pm - 6:41 pm
TYS
-
PIA
6h 47m
1 stop
Allegiant Air Logo
7:31 pm - 11:38 pm
PIA
-
TYS
27h 07m
1 stop
$499Allegiant Air
Booking Insights

KAYAK's insights & trends for Knoxville to Illinois flights

Get data-powered insights and trends into flights from Knoxville to Illinois to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest Knoxville to Illinois flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest ticket to Illinois from Knoxville found in the last 72 hours was to Chicago, at $129 round-trip. The most popular route is from Knoxville (TYS) to Chicago O'Hare Intl Airport (ORD), and the cheapest round-trip airline ticket found on this route in the last 72 hours was $203.

Can I save money by flying with a layover from Knoxville to Illinois?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

No, with an average price for the route of $178, prices are generally cheapest when you fly direct.

What is the cheapest month to fly from Knoxville to Illinois?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Knoxville to Illinois, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Knoxville to Illinois is February, when tickets cost $219 (return) on average. On the other hand, the most expensive months are July and March, when the average cost of round-trip tickets is $335 and $284 respectively.

What’s the cheapest day of the week to fly from Knoxville to Illinois?

The average price of all round-trip flights from Knoxville to Illinois clicked on KAYAK for each day over the last 12 months.

If your flying dates are flexible, you should consider flying to Illinois on a Friday, as we generally find the cheapest rates on that day for this route. On the other hand, Sunday is the most expensive day to fly from Knoxville to Illinois. For your return ticket, we recommend flying on a Saturday and avoiding Fridays for the best deals.

How far in advance should I book a flight from Knoxville to Illinois?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Knoxville to Illinois, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Knoxville to Illinois, you should book around 4 weeks before departure, which saves you about 25% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 21 weeks before departure.

Good to know

Low seasonJune
Cheapest flight$98
Best time to beat the crowds with an average 6% drop in price.
Most popular time to fly and prices are also 17% lower on average.
Flight from Knoxville to Chicago O'Hare Airport

FAQs - booking Illinois flights

  • How does KAYAK find such low prices on flights from Knoxville 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 Knoxville to Illinois.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Knoxville to Illinois 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 Knoxville 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 from Knoxville to Illinois with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Knoxville 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 from Knoxville to Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to Illinois?

    The cheapest time of day to fly to Illinois is generally in the morning, when round-trip flights cost $473 on average. Morning departures are around 14% cheaper than evening flights, on average. The most expensive time of day to fly to Illinois is generally at night, which is peak travel time and where the average cost of a ticket is $783.

Top tips for finding cheap flights to Illinois

  • Looking for a cheap flight? 25% of our users found tickets from Knoxville to the following destinations at these prices or less: Chicago $222 one-way - $366 round-trip

Reviews of the top 4 airlines serving from Knoxville to Illinois

 
See real verified KAYAK customer reviews for airlines flying from Knoxville to Illinois. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Knoxville 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.
7.9
DeltaOverall score based on 8128 reviews
8.1Boarding
7.2Food
8.5Crew
7.9Comfort
7.8Entertainment
Airline reviews

I didn't take this flight. I changed the flight. Why am I getting surveys and notifications on flights that I change. Seems like a defect with Kayak.

2.0 MediocreTodd, Jan 2026
IAH - ATL
Read more Delta reviews

I didn't take this flight. I changed the flight. Why am I getting surveys and notifications on flights that I change. Seems like a defect with Kayak.

Delta One is extraordinary. I fly business when somebody hires me. I just wonder why there is such a chasm between business class and the insanely inhumane and nonsensical coach. The seats are not large enough to fit even my tiny wife. We fly 10% of what we did because we don’t want to pay 5-10 k but for $400 it’s unbearable. It seems like the accountants took over and made stupid decisions. Screw in 20 extra seats and make it so unbearable that people fly 90% less. Just put the damn price up and put some proper chairs in. But business, yay.

Timing, quality of service, promptness and courtesy of the staff

It was last minute due to weather - considering - it was amazing! Good smiles, friendly staff and they were making sure we knew what was going on when and where.

delta last minute gave me a boarding pass for a different flight with no confirmation that they were changing it

The service from the flight attendants were of supreme quality. They greeted and treated everyone with a wide smile. This is totally absent nowadays. Kudos to them!!!!

Excellent flight and got us around tough weather. Only issue was seat TV did not work and crew tried to reboot.

Very large passenger too space from my own seat. Arm board couldn’t be lowered because of his size. It wads very uncomfortable trip, as the flight was full couldn’t move anywhere having back pain because of the position in which I was the entire flight.

was sitting in the jet bridge for 10 minutes in -20 degree weather waiting for my bag

Outdated equipment in disrepair, wifi inoperable. Broken seats, taped air vents, generally poor condition, the 717 showed its age and lack of upkeep.

Seated dude next to me even though lots of empty rows. But main thing was we sat on the tarmac after landing for 30 minutes because of, in the words of the dude who sat next to me, “operational incompetence”. We got changing directions about where to pick up gate checked bags. Pilot and flight attendant were awesome though.

It was a pretty standard flight... until the almost hour and a half spent on the taxi way. I get that the weather has been poor but the delay had nothing to do with the weather and more to do with a plane with several issues tying up the gate. I get that that happens from time to time but this has been EVERY flight I've been on for the past 5 years and I fly 3 to 5 times a year. This isn't just United... it's American, it's Delta. It's an issue with the entire industry. I work for UPS and packages on a cargo plane get better service than people do these days. Anymore I HATE flying.

Perfect flight. Smooth flight. Arrived 20 minutes early at destination. Excellent service.

The flights were on time which was great give. It was holiday travel season and there’d been some weather issues. The only complaint and this is every time with United is the terrible seat design. The head rest is not built for comfort and having my neck bent forward for a cross country trip reminded me while I try not to take United flights as a rule.

Everything was absolutely wonderful from check in to baggage claim. Staff was very professional and sweet. Will definitely recommend United to family and friends.

They did the one thing that really matters - got to Chicago early.

The flight was on time. I generally don’t drink or eat on short flights and the seats were good and the flight attendants were friendly. That’s all I expect

It was nice to have gotten up upgraded to first class with a meal on a three hour flight

Very bad! They kept delaying my flight and wouldn’t do anything about it

Door to door, the crew and staff were amazing. It was a stressful travel day with delays, but they were focused on customers and doing what they could to get us to our destinations.

Update to handle the delay was very bad, crews no smiles or welcome or thanks. Don’t care attitude

Pilot navigated severe weather/snow storm with skill. Described his intentions clearly

Little warm on the plane and delayed for an hour

So excited very proud first of all I wanna thank kayak all updates very professional and fast alart And amazing cabin crew so nice to me they deserve big salute

The boarding process needs to be fixed. The zone don't work, especially when there is hardly anyone in zones 3, 4,and 5, leaving the majority of the passengers backed up in the aisle, especially because passengers seated near the front are blocking passengers who are seated in the rear of the plane. It would also help if the size of carry on bags was more strictly enforced.

Awful. They won’t help me with anything. I booked on American but they abdicated to Iberia. The ticket was overpriced. Everything negative

I enjoyed the extra leg room compared to other airlines. The first stewards made my daughter’s birthday special by giving her an extra snack. Then the last one coming home from Chicago to Appleton made our night really enjoyable Thanks for making our trip enjoyable

Did not get any refreshments. Crew was very nice but limited. Small seats

Wish a flight with more than 2 hours with some snack rather than just cookie/biscuit.

It was good..clean, comfy seat. Friendly warm welcoming crew. Was able to check my cabin luggage at the gate which I was able to pickup in a decent time from baggage claim. The app gave all updates from delays to baggage claim info. Overall smooth flight.

My 90 year old father flew with me. He needed wheel chair assistance and is nearly deaf. The staff was amazing with him.

It was fine. Nobody was outstandingly friendly but no one was rude and everything was smooth . The captain thanked us for flying but no one greeted me as I walked on the plane or as I exited which is the least they could do lol

Clean, friendly, roomy. But check-in from the phone link was terrible. Repeated attempts wouldn’t save at the final step. Just kept spinning! It was very frustrating. Finally, I used the app (vs website link) to check-in which worked very smoothly on the first attempt.

Check in on the web portal was cumbersome! After several attempts I finally got the boarding pass.

Excellent flight and even arrived 23 min early. No entertainment , or wi fi on board, but I downloaded a couple of movies beforehand which kept me entertained. Really like flying Allegiant airlines.

WE were delayed about an hour and never any communications from the employees working the gate. We also were moved to a total of three gates.

I love how they show love to their customers and care about them too.

I liked how when I got on board how fast we ended up taking off but what I truly disliked was how uncomfortable the seats were. There was truly never a time that I could ever get comfortable during both of my flights. The seats could get away during shorter flights but flights 3 hour plus makes it hard to enjoy.

The crew was great and the flight was very smooth. Can’t really judge food since I did not get any because it costs money. The seat was comfortable for what we bought. Thanks!

Crew was great. No entertainment and food and beverage was for purchase only, even water

Everything you need to know for your flight from Knoxville to Illinois

Information on your arrival and departure airports