Cheap flights from Illinois to Knoxville from $70

The month of June is, on average, the cheapest month to fly to Knoxville from Illinois, with most prices found around $262. If you aren’t able to travel during the month of June, then book flights to Knoxville from Illinois during August instead. Flights to Knoxville in August, while not as cheap as those in June, still average around $289.

The cheapest day to depart from Illinois to Knoxville is on a Thursday. Travelers who choose to depart for Knoxville on a Thursday will often find tickets for as low as $270. When flying out on a Monday, the most expensive travel day of the week, you can expect to see flight prices from Illinois to Knoxville for around $380.

At noon is the cheapest time of day to fly from Illinois to Knoxville when you can find flight prices for as low as $239. Flying to Knoxville at noon is an ideal time because this is during off-peak travel hours. In contrast, the most expensive time of day to depart to Knoxville is in the afternoon when prices are around $341.

Fly from Belleville to Knoxville McGhee Tyson for the best Illinois - Knoxville McGhee Tyson flight prices

You are more likely to see cheaper flights to Knoxville from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Knoxville for around $326 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Knoxville from Illinois for as low as $195 on momondo.

There are 4 cabin classes available to choose from on Illinois to Knoxville flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Southwest, Allegiant Air, and United Airlines are the most popular carriers operating from Illinois to Knoxville McGhee Tyson

American Airlines, United Airlines and Allegiant Air are the top three most popular airlines that fly to Knoxville from Illinois according to our data. American Airlines is the first choice among our users, with 51% of people opting to fly with this airline when traveling to Knoxville. Keep in mind that there are 4 different airlines that fly to Knoxville on a routine basis, so you have a few additional options to choose from.

The number of flights available between Illinois and Knoxville is 24 per day as of August 2026. The most frequent departure time is 3:00PM, with 40% of daily flights leaving in the afternoon.

168 flights are operational weekly from Illinois to Knoxville as of August 2026. The most popular departure day for this route is Sun, with 18% of flights per week taking off on this day.