$56 Find Cheap Flights from Knoxville to Illinois - Compare and Save

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Cheap Flights from Knoxville to Illinois

Cheapest round-trip prices found by our users on KAYAK in the last 5 days
Sort by: Cheapest
St. Louis
3h 40m2 stops
from $205per person
Chicago
1h 32mNonstop
from $261per person
Bloomington
4h 25m2 stops
from $314per person
Moline
3h 59m2 stops
from $319per person
Peoria
4h 25m2 stops
from $334per person
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?

Flight prices are below average for this route right now.

Flights to Illinois from Knoxville usually cost between $284 and $415 in October.
The lowest price found in the past 5 days was $265 on Multiple Airlines (Oct 30-Nov 5).

What is the cheapest Knoxville to Illinois flight route?

The cheapest ticket to Illinois from Knoxville found in the last 5 days was to Chicago, at $200 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 $273.

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 $492 on average. Morning departures are around 10% 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 $744.

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

No, with an average price for the route of $275, prices are generally cheapest when you fly direct.

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

The cheapest month for flights from Knoxville to Illinois is January, when tickets cost $236 (return) on average. On the other hand, the most expensive months are September and March, when the average cost of round-trip tickets is $349 and $345 respectively.

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

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 Mondays for the best deals.

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

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 41% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 14 weeks before departure.

Good to know

Low season

January

Cheapest flight

$56
Best time to beat the crowds with an average 34% drop in price.
Most popular time to fly and prices are also 3% 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 $291 one-way - $358 round-trip

Reviews of the top 3 airlines serving from Knoxville to Illinois

 
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 10208 reviews
7.3Comfort
7.1Entertainment
8.1Crew
6.7Food
7.7Boarding
Airline reviews

Very disappointing that on an international business class flight they would not give me access to the lounge in Boston. They said it was because it was a codeshare flight. International business class should include lounge access regardless of codeshare.

6.0 GoodAnonymous, Sep 2026
Read more United Airlines reviews

Very disappointing that on an international business class flight they would not give me access to the lounge in Boston. They said it was because it was a codeshare flight. International business class should include lounge access regardless of codeshare.

Crew was great. Seats are cramped and uncomfortable and I’m a small person.

Awful. Delay after delay. And then again on the tarmac.

Kept changing the takeoff time and the moved it up so arrived when boarding had already started. Then sat waiting to taxi in for a long time

Food was not Good Nuts came very wet & not tasting Good Main course I asked for Steak they got me Chicken because they don’t have more !!!!

The head rest is too big and cannot be placed differently/removed. Causes one head to tilt forward and increase back pain

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.

Even though we were delayed, we were able to make our connection

Another delayed flight. When the delays exceed the duration of the flight, it’s a problem.

Trip was great. A wild landing in Ottawa with the wind and rain, but the pilot did a great job. Always love flying United.👍

The flights to and from Cincinnati were great at being on time for both, departures and arrivals. The planes could use some updating.

It was a dismal experience. The flight was delayed for 4 hours, and we spent hours in the plane, without air, during the summer. We were not provided with water, and the medical assistance was inadequate when it arose.

The landing the pilot was very smooth. The flight attendant was kind of rude.The boarding the plane in punta Gorda was not great made us wait out in the heat 😞

My exit seat was very comfortable Coffee was to be purchased but sodas free 😏

It was poor a four hour delay and no explanation for the delay. What’s a 35 dollars going to do. It also made me miss my car rental,

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.

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!

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

The flight was delayed 6 hours and we were only offered an $8 food credit. My husband stood in line to get the credit for 45 minutes and when he got close to the end of the line the computers went down.

Be just a little friendlier, instead of just doing their job and speaking because it’s their job. At least act they want to speak.

The baggage process at the gate was terrible. Stay was not friendly at all

My wife has a scooter and they where supposed to send from departure to destination and had it go to connecting flight,not good.Nobody has knowledge of the scooters or the battery's.

Not to have gotten delayed by 2+ hours for the fourth straight American flight. They're the worst.

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.

Terrible. Flight delayed for more than 8 hours with only a $12 meal voucher provided for the inconvenience. The airplane did not have breaks on arrival yet they still made us go through the motions and board on time knowing we could not take off then sit for 40+ minutes before having to get of the time. A complete waste of my time. I cannot believe they can stay business with these shenanigans. I’ll avoid this company like the plague moving forward as the lack of accountability is disgraceful.

I didn’t like anything, being platinum pro get you absolutely nowhere and does not increase the customer service treatment whatsoever anymore. My flight was canceled and they put me on a flight eight hours later that would’ve got me back in the middle of the night. They could’ve easily move me up to an hour Prior on an earlier flight. My second flight was unreasonable to take, the third flight was also canceled due to mechanical issues like the first flight. I don’t know what’s going on with American, but they are falling apart, after seven flight changes I finally got home, Unreasonable.

This was a horrible American Airlines experience, and it discourages me from flying with them again. It may have stemmed from a mechanical delay, but it appeared that the team was unprepared to respond to the delay. After boarding, we waited an hour before finally taking off. After landing at our destination, we waited an additional hour on the tarmac waiting for a gate (at 8:00pm) to be assigned and cleared. The flight crew did their best, but they were clearly tired and also ready to be done for the day. Because of the delay, I missed a connecting flight. It was a very poor experience.

Fantastic! If it had not been for a check-in agent in Knoxville I may have not gotten my passes on British Airways. I couldn’t check-in online because British Airways had messed us the info on my tickets to London & Inverness. AA’s was great! British Airways was a continuous series of delays and frustrations.

Wheelchair was waiting for me,changed to a better seat which was great as it's hard for me to walk

More options for your flight from Knoxville to Illinois

Complete your trip to Illinois with a hotel stay or car rental