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$39+ 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 7/28. Fares are subject to change and may not be available on all flights or dates of travel.
TYS — ORD
jun. 23 — jun. 301
lun. 6/23
lun. 6/30
1 adult, Economy
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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 junio 18, 2025.

Round-trip from

$189
(United Airlines)

One-way from

$39
(Mytrip)

Popular in

April

Cheapest in

September

Average price

$269

Good round-trip deal

$82 or less

Good one-way deal

$58 or less
From Knoxville McGhee Tyson to Illinois
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One-way flight from Knoxville McGhee Tyson to Illinois
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Highest demand for flights based on searches. 8% potential increase in price ($23 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Price to beat on a round-trip flight from Knoxville McGhee Tyson to Illinois.
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Price to beat on a one-way flight from Knoxville McGhee Tyson to Illinois.
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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 junio 18, 2025.

This United Airlines deal was found by Cheapflights users on 6/17. 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.
vie. 9/127:00 amTYS - ORD
Nonstop1h 55mUnited Airlines
dom. 9/147:18 amORD - TYS
Nonstop1h 55mUnited Airlines
Deal found 6/17$189
This American Airlines deal was found by Cheapflights users on 6/17. 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.
mié. 7/21:56 pmTYS - ORD
Nonstop1h 58mAmerican Airlines
mar. 7/810:37 amORD - TYS
Nonstop1h 47mAmerican Airlines
Deal found 6/17$194
This Delta deal was found by Cheapflights users on 6/15. 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.
mar. 7/15:45 amTYS - STL
1 stop4h 30mDelta
sáb. 7/57:00 amSTL - TYS
1 stop5h 55mDelta
Deal found 6/15$199
This Mytrip deal was found by Cheapflights users on 6/16. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/255:55 pmTYS - MDW
2 stops23h 48mAllegiant Air
lun. 9/293:16 pmMDW - TYS
Nonstop1h 31mAllegiant Air
Deal found 6/16$207
This Delta deal was found by Cheapflights users on 6/18. 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.
sáb. 9/611:32 amTYS - MDW
1 stop4h 56mDelta
mié. 9/106:00 amMDW - TYS
1 stop6h 08mDelta
Deal found 6/18$209
This Delta deal was found by Cheapflights users on 6/18. 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.
sáb. 9/611:32 amTYS - ORD
1 stop5h 56mDelta
mié. 9/1010:30 amORD - TYS
1 stop5h 06mDelta
Deal found 6/18$209
This Mytrip deal was found by Cheapflights users on 6/16. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 7/1411:01 amTYS - ORD
1 stop7h 20mMultiple Airlines
lun. 7/2110:00 amORD - TYS
1 stop10h 20mMultiple Airlines
Deal found 6/16$215
This Booking.com deal was found by Cheapflights users on 6/16. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 6/195:25 pmTYS - MDW
1 stop19h 15mMultiple Airlines
vie. 6/272:53 pmMDW - TYS
Nonstop1h 25mMultiple Airlines
Deal found 6/16$221
This American Airlines deal was found by Cheapflights users on 6/15. 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.
vie. 9/57:45 pmTYS - PIA
1 stop4h 26mAmerican Airlines
sáb. 9/1310:39 amPIA - TYS
1 stop4h 40mAmerican Airlines
Deal found 6/15$229
This American Airlines deal was found by Cheapflights users on 6/16. 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.
mié. 7/162:02 pmTYS - STL
1 stop7h 29mAmerican Airlines
mié. 7/235:15 amSTL - TYS
1 stop4h 13mAmerican Airlines
Deal found 6/16$229
This American Airlines deal was found by Cheapflights users on 6/18. 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.
sáb. 8/25:58 pmTYS - MLI
1 stop5h 23mAmerican Airlines
sáb. 8/95:50 pmMLI - TYS
1 stop5h 29mAmerican Airlines
Deal found 6/18$249
This Mytrip deal was found by Cheapflights users on 6/16. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 7/178:31 amTYS - PIA
1 stop5h 55mAllegiant Air
dom. 7/209:07 amPIA - TYS
1 stop12h 49mAllegiant Air
Deal found 6/16$294

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 junio 18, 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

KnoxvilleChicago

TYS - ORD

TYSORD

Knoxville McGhee Tyson

vie. 9/12

7:00 am-7:55 am

Nonstop1h 55m

Chicago O'Hare Intl

dom. 9/14

7:18 am-10:13 am

Nonstop1h 55m

$189

KnoxvilleChicago

TYS - ORD

TYSORD

Knoxville McGhee Tyson

mié. 7/2

1:56 pm-2:54 pm

Nonstop1h 58m

Chicago O'Hare Intl

mar. 7/8

10:37 am-1:24 pm

Nonstop1h 47m

$194

KnoxvilleSt. Louis

TYS - STL

TYSSTL

Knoxville McGhee Tyson

mar. 7/1

5:45 am-9:15 am

1 stop4h 30m

Lambert-St Louis

sáb. 7/5

7:00 am-1:55 pm

1 stop5h 55m

$199

KnoxvilleChicago

TYS - MDW

TYSMDW

Knoxville McGhee Tyson

vie. 9/12

6:10 pm-9:44 pm

1 stop4h 34m

Chicago Midway

lun. 9/15

1:05 pm-6:13 pm

1 stop4h 08m

$209

KnoxvilleChicago

TYS - ORD

TYSORD

Knoxville McGhee Tyson

sáb. 9/6

11:32 am-4:28 pm

1 stop5h 56m

Chicago O'Hare Intl

mié. 9/10

10:30 am-4:36 pm

1 stop5h 06m

$209

KnoxvilleChicago

TYS - MDW

TYSMDW

Knoxville McGhee Tyson

dom. 8/3

3:11 pm-12:21 pm

2 stops22h 10m

Chicago Midway

lun. 8/4

2:46 pm-5:12 pm

Nonstop1h 26m

$213

KnoxvilleChicago

TYS - ORD

TYSORD

Knoxville McGhee Tyson

lun. 7/14

11:01 am-5:21 pm

1 stop7h 20m

Chicago O'Hare Intl

lun. 7/21

10:00 am-9:20 pm

1 stop10h 20m

$215

KnoxvilleChicago

TYS - MDW

TYSMDW

Knoxville McGhee Tyson

jue. 7/3

5:25 pm-11:40 am

1 stop19h 15m

Chicago Midway

lun. 7/7

2:54 pm-5:20 pm

Nonstop1h 26m

$221

KnoxvillePeoria

TYS - PIA

TYSPIA

Knoxville McGhee Tyson

vie. 9/5

7:45 pm-11:11 pm

1 stop4h 26m

Greater Peoria

sáb. 9/13

10:39 am-4:19 pm

1 stop4h 40m

$229

KnoxvilleSt. Louis

TYS - STL

TYSSTL

Knoxville McGhee Tyson

mié. 7/16

2:02 pm-8:31 pm

1 stop7h 29m

Lambert-St Louis

mié. 7/23

5:15 am-10:28 am

1 stop4h 13m

$229

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/17

Showing 1-10 of 35 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 $245). Flying from Knoxville to Illinois in March is currently the most expensive (average of $321). 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 junio 18, 2025.

When flying from Knoxville to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 junio 18, 2025.

The most flights from TYS to USIL are scheduled on a Tuesday (31 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (9 on average).

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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 junio 18, 2025.
Get a feel of what it's like to fly with Delta, United Airlines and Allegiant Air from Knoxville to Illinois by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,964 reviews

Overall

8.0

Entertainment

7.9

Boarding

8.2

Food

7.3

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,964 reviews
Delta
8.0
Very good
7,964 reviews

Overall

8.0

Entertainment

7.9

Boarding

8.2

Food

7.3

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,810 reviews
Delta
8.0
Very good
7,964 reviews

Overall

8.0

Entertainment

7.9

Boarding

8.2

Food

7.3

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Allegiant Air
7.3
Good
722 reviews
Delta
8.0
Very good
7,964 reviews

Overall

8.0

Entertainment

7.9

Boarding

8.2

Food

7.3

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,964 reviews

Overall

8.0

Entertainment

7.9

Boarding

8.2

Food

7.3

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Spirit Airlines
6.3
Okay
8,065 reviews
Delta
8.0
Very good
7,964 reviews

Overall

8.0

Entertainment

7.9

Boarding

8.2

Food

7.3

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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.

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

    The cheapest airline one-way is Allegiant Air, with whom users have recently found tickets for as low as $39. However, be on the lookout for offers from Delta and Frontier, 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 (95%) or ANA (93%) 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 $891, our data indicates the cheapest price to be $142. 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 $245). Flying from Knoxville to Illinois in March is currently the most expensive (average of $321). 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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Alternative routes for Knoxville to Illinois

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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 junio 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
Allegiant AirCheapest$74Average$81FlexibilityNo cancel feeOn-time88%
American AirlinesCheapest$165Average$377FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$184Average$330FlexibilityNo cancel feeOn-time69%
DeltaCheapest$233Average$373FlexibilityNo cancel feeOn-timeN/A

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