$57 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 7/9. 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$162
Moline
Moline1 stop$309
Peoria
Peoria1 stop$286
Bloomington
Bloomington1 stop$289
St. Louis
St. Louis1 stop$237
Chicago
Chicagononstop$162
Moline
Moline1 stop$309
Peoria
Peoria1 stop$286
Bloomington
Bloomington1 stop$289
St. Louis
St. Louis1 stop$237

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

Sun, Jul 12 - Sun, Jul 19
Allegiant Air Logo
1:22 pm - 1:58 pm
TYS
-
MDW
1h 36mnonstop
Allegiant Air Logo
2:48 pm - 5:18 pm
MDW
-
TYS
1h 30mnonstop
$162Allegiant Air
Thu, Aug 6 - Sun, Aug 9
Allegiant Air Logo
1:23 pm - 1:59 pm
TYS
-
MDW
1h 36mnonstop
Allegiant Air Logo
2:49 pm - 5:19 pm
MDW
-
TYS
1h 30mnonstop
$197Allegiant Air
Thu, Aug 20 - Tue, Aug 25
Southwest Logo
5:45 pm - 10:20 pm
TYS
-
MDW
5h 35m
1 stop
Southwest Logo
1:00 pm - 6:55 pm
MDW
-
TYS
4h 55m
2 stops
$215Southwest
Mon, Aug 3 - Fri, Aug 7
Multiple Airlines Logo
7:20 pm - 11:10 pm
TYS
-
ORD
28h 50m
1 stop
Multiple Airlines Logo
8:05 am - 10:26 am
ORD
-
TYS
25h 21m
1 stop
$222Multiple Airlines
Thu, Aug 20 - Thu, Aug 27
Southwest Logo
5:45 pm - 10:20 pm
TYS
-
MDW
5h 35m
1 stop
Southwest Logo
9:10 am - 5:10 pm
MDW
-
TYS
7h 00m
1 stop
$226Southwest
Thu, Aug 20 - Tue, Aug 25
Multiple Airlines Logo
4:52 pm - 12:25 pm
TYS
-
ORD
20h 33m
1 stop
Multiple Airlines Logo
7:55 am - 10:04 am
ORD
-
TYS
25h 09m
1 stop
$230Multiple Airlines
Wed, Jul 8 - Mon, Jul 13
American Airlines Logo
11:35 am - 12:38 pm
TYS
-
ORD
2h 03mnonstop
American Airlines Logo
9:40 am - 12:30 pm
ORD
-
TYS
1h 50mnonstop
$249American Airlines
Mon, Jul 27 - Mon, Aug 3
American Airlines Logo
7:02 am - 8:10 am
TYS
-
ORD
2h 08mnonstop
American Airlines Logo
7:09 pm - 9:58 pm
ORD
-
TYS
1h 49mnonstop
$250American Airlines
Sat, Jul 4 - Fri, Jul 10
United Airlines Logo
5:50 pm - 11:20 pm
TYS
-
PIA
6h 30m
1 stop
United Airlines Logo
2:33 pm - 8:44 pm
PIA
-
TYS
5h 11m
1 stop
$304United Airlines
Fri, Aug 28 - Mon, Aug 31
United Airlines Logo
6:02 pm - 11:14 pm
TYS
-
MLI
6h 12m
1 stop
United Airlines Logo
1:15 pm - 8:53 pm
MLI
-
TYS
6h 38m
1 stop
$309United Airlines
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.

How much is a round-trip flight from Knoxville to Illinois?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Knoxville to Illinois departing in August.

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 5 days was to Chicago, at $61 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 5 days was $264.

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

The average price for all round-trip flights from Knoxville to Illinois depending on the time of departure, clicked by users on KAYAK in the last 2 weeks.

The cheapest time of day to fly to Illinois is generally in the morning, when round-trip flights cost $490 on average. Morning departures are around 5% 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 $652.

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 $228, 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 November, when tickets cost $48 (return) on average. On the other hand, the most expensive months are March and February, when the average cost of round-trip tickets is $189 and $185 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 Sundays 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 5 weeks before departure, which saves you about 20% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 21 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$57
Best time to beat the crowds with an average 24% drop in price.
Most popular time to fly and prices are also 7% lower on average.
Flight from Knoxville to Chicago Midway 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.

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 $255 one-way - $397 round-trip

Reviews of the top 3 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.
7.4
United AirlinesOverall score based on 9843 reviews
7.1Entertainment
7.7Boarding
7.3Comfort
8.1Crew
6.6Food
Airline reviews

Over 5 hour delay with minimal updates or ability to standby for alternative flights. During boarding and 1 hr+ wait for takeoff, seats were drenched w water from air conditioning condensation and always leftover crumbs on carpet and seats

2.0 MediocreLynn, Jun 2026
DCA - ORD
Read more United Airlines reviews

Over 5 hour delay with minimal updates or ability to standby for alternative flights. During boarding and 1 hr+ wait for takeoff, seats were drenched w water from air conditioning condensation and always leftover crumbs on carpet and seats

Boarded early, left early, arrived 40 mins early! A win win for me!

These airplanes should be illegal. The seats are two tight, it is a safety issue. Wheelchair support was ridiculously slow. We almost missed our flight.

This flight is a quick way to get to Chicago, but a bit expensive.

Our flight to Rome, Italy was cancelled the day of and we were never informed. We only found out because I was trying to get into my husbands account and called to get his account number. Had to pay more for worse seating on another airline.

O’hsre taxi and deboarding took 40 minutes. Needed 20 minutes extra time between connecting flights to avoid running through terminal.

Standard flight with a drinks and a snack- overall very quick flight. The flight attendants were very strict, bordered on rude.

Delayed - weather wasn't bad at either end. Also sat on tarmac in ORD.

boarded early to only find out that flight would sit at gate for 45 min to an hour. Landed in chicago and sat on runway for over an hour before got to gate. Total delay was extensive for a 45 min flight door to door.

The flight was significantly delayed. The inbound flight from EWR was delayed departing because of mechanical problems. My original departure from CLT was 5:28 pm but due to the delay of the inbound flight, after arrival, deplaning, cleaning, boarding, we did not push back from the gate until 9:00 pm. Once in the air, the flight was smooth and what was originally supposed to be an arrival in ORD at 7:30 pm local time turned out to be 9:35 pm.

Seats were very uncomfortable and being charged for snacks and water.........

Allegiant actually impressed me, original inbound flight from PBG was so late they gave us a bird inbound from Des Moines and only left 1h late and gained 40 minutes back in the air. Comfortable flight with no frills but no complaints.

Flight was delayed. Crew was good but hot coffee was not available.

Great. No choice for n/a. No food or entertainment options

No food is available without purchasing it and there is no in-flight entertainment. Both of these are OK because we got an inexpensive flight from Allegiant and, otherwise, our experience was excellent.

just had water and there was plenty of leg & seat room. But then i don't weight 220#s!!

Not totally their fault- screaming kids that had zero parent intervention.

It was cold on the flight. The crew was very pleasant. I didn't order any food. We were delayed due to Captain waiting on maintenance log. He kept us informed though. The flight itself was smooth. I would definitely fly with Allegiant again!

I had a fantastic experience with Allegiant. I had wheelchair assistance and they helped me find my luggage and brought me to my car. Even loaded my luggage. Wonderful service!! Thank you Allegiant!

Superb. Staff great. Great flight. As with other airlines, seating too tight and restrictive.

The flight was delayed significantly and we sat on runway after landing for awhile. Best thing was the flight attendant, Jenny, in first class, who was very professional and attentive. She was excellent - the rest of the flight was not.

The flight attendants were extremely sourly and borderline rude. I did not feel appreciated as an AA customer once.

The flight from LA to Chicago was smooth and service was very good overall.

The Mario was so helpful and provided amazing customer service however l have being waiting for a callback for almost a week now and have not heard anything further after l informed them l wanted to change my date of traveling because of my hospital appointment even send them proof and l was unable to use manag your booking on their website is a bit frustrating and l would appreciate an update on My request as soon as possible. And have called them times without numbers no response

Awful, tons of delays, I got into Chicago multiple hours late meaning I hit the very traffic I tried so desperately to avoid. Just empty apologies from American Airlines text alerts. Trash behavior from a trash airline.

They lost my baggage and I am still struggling to the information and update

Requested early boarding to disinfect seat, tray table, etc. before general boarding. Instructed to board after wheelchair passengers. Waited on jet bridge behind 12 wheelchair passengers. Stopped immediately after entering plane to wait for gate agent in rear of plane cleaning a seat that was wet, got to my row and found both seats adjacent to mine already occupied, with the lack of room making it impossible for me to clean my own space and defeating the purpose of my boarding early. Cleaned the armrests and tray table as best I could.

The wifi experience is awful. I had to try again and again, taking over 30 minutes, to connect to the wifi. I had to watch the same two ads over and over until I was finally successful. Once connected, it was anything but "high speed" and disconnected at least three times during the flight.

It was good, the staff was great, and the food, was as usual, tea and biscuit. Bathroom was clean, and the plane was clean as well.

Very good I can’t complain one bit. Thank you American Airlines for making my flight enjoyable and safe!

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

Information on your arrival and departure airports