HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Idaho

$171+ Cheap flights from Knoxville (TYS) to Idaho

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 12/7. Fares are subject to change and may not be available on all flights or dates of travel.
TYS — BOI
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Knoxville to Idaho with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Knoxville to Idaho

Keep the following information in mind while searching for Knoxville to Idaho flight deals. Data was last updated September 11, 2025.

Round-trip from

$243
(Delta)

One-way from

$171
(Kiwi.com)

Popular in

December

Cheapest in

April

Average price

$323
From Knoxville McGhee Tyson to Idaho
Search Deals
One-way flight from Knoxville McGhee Tyson to Idaho
Search Deals
Highest demand for flights based on searches. 27% potential increase in price ($175 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease ($33 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

Find flight deals from Knoxville to Idaho

Cheapest flights from Knoxville to Idaho
Explore the most affordable flight options available from Knoxville to Idaho. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/11. 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.
Thu 10/238:17 pmTYS - BOI
1 stop17h 26mFrontier
Sun 10/2612:28 pmBOI - TYS
1 stop29h 04mFrontier
Deal found 9/11$246
This Kiwi.com deal was found by Cheapflights users on 9/11. 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.
Thu 10/235:34 pmTYS - BOI
2 stops20h 09mMultiple Airlines
Sun 10/2612:28 pmBOI - TYS
1 stop29h 04mMultiple Airlines
Deal found 9/11$251
This American Airlines deal was found by Cheapflights users on 9/11. 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 10/216:00 amTYS - BOI
1 stop8h 38mAmerican Airlines
Tue 10/281:35 pmBOI - TYS
1 stop8h 48mAmerican Airlines
Deal found 9/11$316
This Delta deal was found by Cheapflights users on 9/10. 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.
Sat 9/275:45 amTYS - GEG
1 stop8h 37mDelta
Tue 9/302:23 pmGEG - TYS
1 stop6h 13mDelta
Deal found 9/10$354
This American Airlines deal was found by Cheapflights users on 9/11. 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.
Sat 11/155:10 amTYS - JAC
1 stop9h 06mAmerican Airlines
Thu 11/201:11 pmJAC - TYS
1 stop8h 41mAmerican Airlines
Deal found 9/11$384
This Delta deal was found by Cheapflights users on 9/11. 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.
Wed 10/155:44 amTYS - BOI
2 stops12h 22mDelta
Sun 10/1911:39 pmBOI - TYS
1 stop7h 21mDelta
Deal found 9/11$388
This American Airlines deal was found by Cheapflights users on 9/11. 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.
Fri 9/264:37 pmTYS - BOI
1 stop7h 11mAmerican Airlines
Tue 9/301:57 pmBOI - TYS
2 stops8h 24mAmerican Airlines
Deal found 9/11$395
This American Airlines deal was found by Cheapflights users on 9/10. 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.
Fri 11/75:10 amTYS - BOI
1 stop9h 25mAmerican Airlines
Mon 11/101:25 pmBOI - TYS
1 stop8h 43mAmerican Airlines
Deal found 9/10$397
This Delta deal was found by Cheapflights users on 9/10. 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.
Sat 11/16:40 amTYS - LWS
2 stops17h 23mDelta
Tue 11/47:10 amLWS - TYS
2 stops13h 12mDelta
Deal found 9/10$411
This Delta deal was found by Cheapflights users on 9/10. 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 11/75:44 amTYS - BOI
2 stops10h 18mDelta
Mon 11/103:00 pmBOI - TYS
1 stop6h 09mDelta
Deal found 9/10$422
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Sun 12/144:30 pmTYS - JAC
1 stop6h 07mUnited Airlines
Sat 12/2012:35 pmJAC - TYS
1 stop8h 04mUnited Airlines
Deal found 9/10$424
This United Airlines deal was found by Cheapflights users on 9/11. 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.
Mon 10/137:00 amTYS - GEG
1 stop7h 42mUnited Airlines
Sun 10/1911:20 amGEG - TYS
1 stop8h 30mUnited Airlines
Deal found 9/11$487

Cheapflights Fare Finder

 
Customize your flight search to find flights from Knoxville to Idaho 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 September 11, 2025.
Use the filters below to find and compare flights from Knoxville to Idaho that are best for you.

Fly from

Knoxville

Fly to

Idaho

Route

Depart

Return

Price

KnoxvilleBoise

TYS - BOI

TYSBOI

Knoxville McGhee Tyson

Sat 2/21

6:45 am-2:09 pm

1 stop9h 24m

Boise Air Term. Gowen Fld

Tue 2/24

3:00 pm-11:00 pm

1 stop6h 00m

$243

KnoxvilleBoise

TYS - BOI

TYSBOI

Knoxville McGhee Tyson

Thu 10/23

8:17 pm-11:43 am

1 stop17h 26m

Boise Air Term. Gowen Fld

Sun 10/26

12:28 pm-7:32 pm

1 stop29h 04m

$246

KnoxvilleBoise

TYS - BOI

TYSBOI

Knoxville McGhee Tyson

Thu 10/23

5:34 pm-11:43 am

2 stops20h 09m

Boise Air Term. Gowen Fld

Sun 10/26

12:28 pm-7:32 pm

1 stop29h 04m

$251

KnoxvilleBoise

TYS - BOI

TYSBOI

Knoxville McGhee Tyson

Tue 10/21

6:00 am-12:38 pm

1 stop8h 38m

Boise Air Term. Gowen Fld

Tue 10/28

1:35 pm-12:23 am

1 stop8h 48m

$316

KnoxvilleBoise

TYS - BOI

TYSBOI

Knoxville McGhee Tyson

Sat 2/21

2:00 pm-10:22 pm

2 stops10h 22m

Boise Air Term. Gowen Fld

Tue 2/24

8:05 am-7:34 pm

2 stops9h 29m

$343

KnoxvilleSpokane

TYS - GEG

TYSGEG

Knoxville McGhee Tyson

Sat 9/27

5:45 am-11:22 am

1 stop8h 37m

Spokane

Tue 9/30

2:23 pm-11:36 pm

1 stop6h 13m

$354

KnoxvilleJackson

TYS - JAC

TYSJAC

Knoxville McGhee Tyson

Sat 11/15

5:10 am-12:16 pm

1 stop9h 06m

Jackson Hole

Thu 11/20

1:11 pm-11:52 pm

1 stop8h 41m

$384

KnoxvilleBoise

TYS - BOI

TYSBOI

Knoxville McGhee Tyson

Wed 10/15

5:44 am-4:06 pm

2 stops12h 22m

Boise Air Term. Gowen Fld

Sun 10/19

11:39 pm-9:00 am

1 stop7h 21m

$388

KnoxvilleLewiston

TYS - LWS

TYSLWS

Knoxville McGhee Tyson

Sat 11/1

9:30 am-9:03 pm

2 stops14h 33m

Lewiston Nez Perce Rgnl

Tue 11/4

7:10 am-10:55 pm

2 stops12h 45m

$411

KnoxvilleSpokane

TYS - GEG

TYSGEG

Knoxville McGhee Tyson

Mon 10/13

7:00 am-11:42 am

1 stop7h 42m

Spokane

Sun 10/19

11:20 am-10:50 pm

1 stop8h 30m

$487

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/8

Showing 1-10 of 38 results
1
2
3
4

Best time to book a flight from Knoxville to Idaho

Have a flexible travel schedule? Discover the best time to fly to Idaho 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 Idaho

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

Currently, October is the cheapest month in which you can book a flight from Knoxville to Idaho (average of $314). Flying from Knoxville to Idaho in June is currently the most expensive (average of $398). 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 ID?

Find hourly flight availability from Knoxville to Idaho. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

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

Reviews of airlines servicing Idaho

Get insights into the airlines that provide service to Idaho. 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 Idaho. Reviews last updated September 11, 2025.
See what other customers who have flown with Delta, United Airlines, and American Airlines from Knoxville to Idaho have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,960 reviews

Entertainment

7.9

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

8.0

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
7,960 reviews
Delta
8.0
Very good
7,960 reviews

Entertainment

7.9

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

8.0

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
8,937 reviews
Delta
8.0
Very good
7,960 reviews

Entertainment

7.9

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

8.0

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
7,960 reviews

Entertainment

7.9

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

8.0

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 Idaho. 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 Idaho?

    Knoxville McGhee Tyson (TYS), located 11.3 mi from the city center, is the airport you fly out of when you book flights from Knoxville to Idaho.

  • How long is the flight from Knoxville to Idaho?

    Departing from Knoxville to Idaho will take you 9h 06m. Airlines will cover a distance of 1511 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 Idaho one-way?

    The cheapest airline one-way is American Airlines, with whom users have recently found tickets for as low as $199. However, be on the lookout for offers from Delta and United Airlines, as they are both options that can get you from Knoxville to Idaho for a low price.

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

    When deciding which route to take from Knoxville to Idaho consider Knoxville McGhee Tyson - Jackson Hole, Knoxville McGhee Tyson - Boise Air Term. Gowen Fld or Knoxville McGhee Tyson - Spokane as they are the most popular.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Knoxville to Idaho 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 Idaho?

    Currently, October is the cheapest month in which you can book a flight from Knoxville to Idaho (average of $314). Flying from Knoxville to Idaho in June is currently the most expensive (average of $398). 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Knoxville to Idaho

See prices for flight routes from nearby airports that may be better suited for you.
Nashville to LaGuardia flights
Nashville to John F Kennedy Intl flights
Nashville to Las Vegas flights
Nashville to Denver flights
Nashville to Newark flights
Memphis to LaGuardia flights
Memphis to Newark flights
Memphis to John F Kennedy Intl flights
Memphis to Las Vegas flights
Nashville to Los Angeles flights
Memphis to Dallas/Fort Worth flights
Nashville to Boston flights
Nashville to Seattle flights
Nashville to Orlando flights
Nashville to O'Hare Intl flights
Nashville to Miami flights
Nashville to Sky Harbor Intl flights
Chattanooga to LaGuardia flights
Memphis to Denver flights
Nashville to Fort Lauderdale flights
Knoxville to O'Hare Intl flights
Nashville to Hobby flights
Memphis to Boston flights
Knoxville to LaGuardia flights
Memphis to Orlando flights
Nashville to Dallas/Fort Worth flights
Nashville to George Bush Intcntl flights
Nashville to Dulles Intl flights
Nashville to Reagan-National flights
Memphis to Atlanta flights
Chattanooga to John F Kennedy Intl flights
Nashville to Salt Lake City flights
Memphis to Los Angeles flights
Memphis to Hobby flights
Nashville to San Francisco flights
Knoxville to John F Kennedy Intl flights
Memphis to George Bush Intcntl flights
Memphis to Reagan-National flights
Nashville to Midway flights
Memphis to O'Hare Intl flights
Memphis to Miami flights
Memphis to Love Field flights
Knoxville to Denver flights
Nashville to Philadelphia flights
Knoxville to Las Vegas flights
Memphis to Dulles Intl flights
Nashville to Baltimore flights
Chattanooga to O'Hare Intl flights
Chattanooga to Seattle flights
Chattanooga to Las Vegas flights

Top 3 airlines flying from Knoxville to Idaho

Discover the top 3 airlines that operate flights from Knoxville to Idaho. 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$172Average$482FlexibilityNo cancel feeOn-time71%
DeltaCheapest$269Average$384FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$313Average$546FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.