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$55+ Cheap flights from Knoxville (TYS) to Illinois

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/4. Fares are subject to change and may not be available on all flights or dates of travel.
TYS — ORD
Dec 10 — Dec 171
Wed 12/10
Wed 12/17
1 adult, Economy
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Find flight deals from Knoxville to Illinois

Cheapest flights from Knoxville to Illinois
Explore the most affordable flight options available from Knoxville to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 10, 2025.

This Frontier deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/44:52 pmTYS - STL
1 stop18h 22mFrontier
Wed 12/107:43 pmSTL - TYS
1 stop19h 14mFrontier
Deal found 11/9$112
This American Airlines deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/42:58 pmTYS - ORD
Nonstop2h 08mAmerican Airlines
Sat 12/62:17 pmORD - TYS
Nonstop1h 55mAmerican Airlines
Deal found 11/8$189
This United Airlines deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/65:54 pmTYS - ORD
Nonstop2h 01mUnited Airlines
Sun 1/187:42 amORD - TYS
Nonstop1h 50mUnited Airlines
Deal found 11/8$199
This Kiwi.com deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/2112:45 pmTYS - MDW
Nonstop1h 36mMultiple Airlines
Mon 11/2412:25 pmMDW - TYS
2 stops9h 27mMultiple Airlines
Deal found 11/8$204
This Kiwi.com deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/68:32 pmTYS - STL
1 stop13h 27mMultiple Airlines
Sat 12/137:43 pmSTL - TYS
1 stop16h 28mMultiple Airlines
Deal found 11/8$208
This Delta deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/1212:50 pmTYS - MDW
1 stop6h 10mDelta
Mon 12/151:14 pmMDW - TYS
1 stop5h 46mDelta
Deal found 11/9$209
This Delta deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/1212:50 pmTYS - ORD
1 stop6h 37mDelta
Mon 12/155:59 pmORD - TYS
1 stop4h 29mDelta
Deal found 11/9$209
This American Airlines deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/2311:21 amTYS - ORD
Nonstop1h 57mAmerican Airlines
Mon 1/1210:07 amORD - TYS
Nonstop1h 39mAmerican Airlines
Deal found 11/8$214
This Kiwi.com deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/221:45 pmTYS - MDW
1 stop20h 37mAllegiant Air
Mon 11/242:11 pmMDW - TYS
Nonstop1h 25mAllegiant Air
Deal found 11/8$216
This United Airlines deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/228:26 amTYS - ORD
Nonstop2h 04mUnited Airlines
Mon 11/247:20 amORD - TYS
Nonstop1h 45mUnited Airlines
Deal found 11/8$219
This American Airlines deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/116:29 pmTYS - ORD
Nonstop2h 04mAmerican Airlines
Sun 12/146:48 pmORD - TYS
Nonstop1h 52mAmerican Airlines
Deal found 11/9$223
This Delta deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/272:49 pmTYS - ORD
1 stop5h 03mDelta
Mon 12/16:45 amORD - TYS
1 stop5h 49mDelta
Deal found 11/9$224

Cheap flight deals from Knoxville to Illinois

Keep the following information in mind while searching for Knoxville to Illinois flight deals. Data was last updated November 10, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$112
(Frontier)

One-way from

$55
(Frontier)

Popular in

July

Cheapest in

February

Average price

$294

Good round-trip deal

$96 or less

Good one-way deal

$77 or less
Provider with most accurate pricing for Knoxville McGhee Tyson-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Knoxville McGhee Tyson-Chicago (CHI) flights.
Search Deals
From Knoxville McGhee Tyson to Illinois
Search Deals
One-way flight from Knoxville McGhee Tyson to Illinois
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($14 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals
Price to beat on a round-trip flight from Knoxville McGhee Tyson to Illinois.
Search Deals
Price to beat on a one-way flight from Knoxville McGhee Tyson to Illinois.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Knoxville to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated November 10, 2025.
Use the filters below to find and compare flights from Knoxville to Illinois that are best for you.

Fly from

Knoxville

Fly to

Illinois

Route

Depart

Return

Price

KnoxvilleSt. Louis

TYS - STL

TYSSTL

Knoxville McGhee Tyson

Thu 12/4

4:52 pm-10:14 am

1 stop18h 22m

Lambert-St Louis

Wed 12/10

7:43 pm-3:57 pm

1 stop19h 14m

$112

KnoxvilleChicago

TYS - ORD

TYSORD

Knoxville McGhee Tyson

Fri 1/9

5:29 pm-6:27 pm

Nonstop1h 58m

Chicago O'Hare Intl

Sun 1/11

6:20 pm-9:02 pm

Nonstop1h 42m

$189

KnoxvilleChicago

TYS - ORD

TYSORD

Knoxville McGhee Tyson

Fri 2/13

4:56 pm-6:06 pm

Nonstop2h 10m

Chicago O'Hare Intl

Sun 2/15

6:47 pm-9:32 pm

Nonstop1h 45m

$189

KnoxvilleChicago

TYS - ORD

TYSORD

Knoxville McGhee Tyson

Sat 2/28

6:45 am-7:47 am

Nonstop2h 02m

Chicago O'Hare Intl

Sun 3/1

7:25 am-10:12 am

Nonstop1h 47m

$189

KnoxvilleChicago

TYS - ORD

TYSORD

Knoxville McGhee Tyson

Fri 5/1

8:23 pm-9:30 pm

Nonstop2h 07m

Chicago O'Hare Intl

Sat 5/9

8:00 am-10:46 am

Nonstop1h 46m

$189

KnoxvilleChicago

TYS - ORD

TYSORD

Knoxville McGhee Tyson

Fri 2/6

6:45 am-7:48 am

Nonstop2h 03m

Chicago O'Hare Intl

Sun 2/8

7:42 am-10:32 am

Nonstop1h 50m

$189

KnoxvilleChicago

TYS - ORD

TYSORD

Knoxville McGhee Tyson

Fri 2/27

6:45 am-7:47 am

Nonstop2h 02m

Chicago O'Hare Intl

Sun 3/1

7:25 am-10:12 am

Nonstop1h 47m

$189

KnoxvilleChicago

TYS - ORD

TYSORD

Knoxville McGhee Tyson

Sat 12/6

5:54 pm-6:55 pm

Nonstop2h 01m

Chicago O'Hare Intl

Sun 1/18

7:42 am-10:32 am

Nonstop1h 50m

$199

KnoxvilleChicago

TYS - MDW

TYSMDW

Knoxville McGhee Tyson

Fri 11/21

12:45 pm-1:21 pm

Nonstop1h 36m

Chicago Midway

Mon 11/24

12:25 pm-10:52 pm

2 stops9h 27m

$204

KnoxvilleChicago

TYS - MDW

TYSMDW

Knoxville McGhee Tyson

Fri 12/12

12:50 pm-6:00 pm

1 stop6h 10m

Chicago Midway

Mon 12/15

1:14 pm-8:00 pm

1 stop5h 46m

$209

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/8

Showing 1-10 of 60 results
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Best time to book a flight from Knoxville to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Knoxville with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

What is the cheapest month to book a flight from Knoxville to Illinois?

Currently, August is the cheapest month in which you can book a flight from Knoxville to Illinois (average of $58). Flying from Knoxville to Illinois in February is currently the most expensive (average of $189). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from TYS to IL?

Find hourly flight availability from Knoxville to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 10, 2025.

It’s typically best to fly out from Knoxville to Illinois at noon. Doing so could potentially save you 51% on the flight price compared to flying in the evening, which is usually more expensive.

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

Use this chart to determine the cheapest time to fly round-trip from Knoxville to Illinois. Price data was last updated on November 2, 2025.

Travelers seeking maximum savings on their Knoxville to Illinois flight should consider departing on Wednesday at noon when fares are most often at their lowest. Saturday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Knoxville to Illinois

Explore weekly flight availability from Knoxville to Illinois. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated November 10, 2025.

The most flights from TYS to USIL are scheduled on a Monday (33 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (21 on average).

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated November 10, 2025.
Read through reviews of airlines operating flights from Knoxville to Illinois, such as Delta, United Airlines, and American Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,004 reviews

Boarding

8.1

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

7.9

Crew

8.5

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,004 reviews
Delta
7.9
Good
8,004 reviews

Boarding

8.1

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

7.9

Crew

8.5

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
United Airlines
7.4
Good
9,012 reviews
Delta
7.9
Good
8,004 reviews

Boarding

8.1

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

7.9

Crew

8.5

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
American Airlines
7.2
Good
11,047 reviews
Delta
7.9
Good
8,004 reviews

Boarding

8.1

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

7.9

Crew

8.5

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Allegiant Air
7.2
Good
697 reviews
Delta
7.9
Good
8,004 reviews

Boarding

8.1

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

7.9

Crew

8.5

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

Related info for your journey

Find useful and relevant information for your journey from Knoxville to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Knoxville to Illinois?

    If you book a flight to Illinois from Knoxville, you will be flying from McGhee Tyson, which is the city’s only airport. Knoxville McGhee Tyson (TYS) is located 11.3 mi from the center of Knoxville.

  • How long is the flight from Knoxville to Illinois?

    For as low as $189, Frontier can have you in Illinois from Knoxville in 1h 58m. The distance between Knoxville and Illinois is about 475 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Knoxville to Illinois one-way?

    The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $55. However, be on the lookout for offers from Allegiant Air and Delta, as they are both options that can get you from Knoxville to Illinois for a low price.

  • What are the most popular routes from Knoxville to Illinois?

    When deciding which route to take from Knoxville to Illinois consider Knoxville McGhee Tyson - Chicago O'Hare Intl, Knoxville McGhee Tyson - Chicago Midway or Knoxville McGhee Tyson - Lambert-St Louis as they are the most popular.

  • What are the most reliable airlines from Knoxville to Illinois?

    No one likes to see their flight delayed. When booking a flight from Knoxville to Illinois consider choosing Avianca (97%), Republic Airways (96%) or ANA (88%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Knoxville to Illinois?

    Looking for the cheapest flight from Knoxville to Illinois? While on average our users pay $879, our data indicates the cheapest price to be $128. The most popular route (Knoxville McGhee Tyson - Chicago O'Hare Intl), is priced around $189.

  • Can I find deals for flights from Knoxville to Illinois that include hotel bookings?

    Yes. In addition to deals on Knoxville to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Knoxville to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Knoxville to Illinois.

  • Can I find deals for business class flights from Knoxville to Illinois?

    Yes. Cheapflights offers flight deals from Knoxville to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Knoxville to Illinois?

    Currently, August is the cheapest month in which you can book a flight from Knoxville to Illinois (average of $58). Flying from Knoxville to Illinois in February is currently the most expensive (average of $189). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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Top 4 airlines flying from Knoxville to Illinois

Discover the top 4 airlines that operate flights from Knoxville to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated November 10, 2025.
AirlineCheapestAverageFlexibilityOn-time
Allegiant AirCheapest$60Average$103FlexibilityNo cancel feeOn-time88%
American AirlinesCheapest$189Average$359FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$189Average$345FlexibilityNo cancel feeOn-time69%
DeltaCheapest$258Average$373FlexibilityNo cancel feeOn-timeN/A

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