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$128+ Cheap flights from Knoxville to Boise (TYS - BOI)

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 10/30. Fares are subject to change and may not be available on all flights or dates of travel.
TYS — BOI
Oct 18 — Oct 251
Sat 10/18
Sat 10/25
1 adult, Economy
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Cheap flight deals from Knoxville to Boise

Discover tips and strategies to find the most affordable flight options for your journey from Knoxville (TYS) to Boise (BOI). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 18, 2025.

Round-trip from

$347
(Kiwi.com)

One-way from

$128
(Kiwi.com)

Popular in

December

Cheapest in

April

Average price

$485
From Knoxville McGhee Tyson to Boise Air Term. Gowen Fld
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One-way flight from Knoxville McGhee Tyson to Boise Air Term. Gowen Fld
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Highest demand for flights based on searches. 25% potential increase in price ($159 potential increase over avg. RT price).
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Cheapest flight prices on average. 6% potential price decrease ($32 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Knoxville to Boise

Cheapest flights from Knoxville to Boise
Explore the most affordable flight options available from Knoxville to Boise. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 18, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/168:17 pmTYS - BOI
1 stop17h 26mFrontier
Sun 10/1912:28 pmBOI - TYS
1 stop29h 04mFrontier
Deal found 9/17$347
This United Airlines deal was found by Cheapflights users on 9/17. 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.
Sat 11/84:50 pmTYS - BOI
1 stop7h 47mUnited Airlines
Tue 11/116:15 amBOI - TYS
1 stop6h 28mUnited Airlines
Deal found 9/17$389
This Delta deal was found by Cheapflights users on 9/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/86:15 amTYS - BOI
2 stops9h 47mDelta
Tue 11/118:45 amBOI - TYS
2 stops8h 15mDelta
Deal found 9/17$399
This American Airlines deal was found by Cheapflights users on 9/17. 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.
Fri 10/316:00 amTYS - BOI
1 stop8h 43mAmerican Airlines
Sun 11/27:00 amBOI - TYS
1 stop6h 37mAmerican Airlines
Deal found 9/17$413
This Delta deal was found by Cheapflights users on 9/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/176:04 pmTYS - BOI
1 stop7h 52mDelta
Fri 10/2411:39 pmBOI - TYS
1 stop8h 49mDelta
Deal found 9/17$437
This Delta deal was found by Cheapflights users on 9/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/306:40 amTYS - BOI
2 stops11h 26mDelta
Sun 11/211:39 pmBOI - TYS
1 stop7h 21mDelta
Deal found 9/17$442
This United Airlines deal was found by Cheapflights users on 9/17. 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.
Sat 10/187:00 amTYS - BOI
1 stop6h 39mUnited Airlines
Sun 10/1912:35 pmBOI - TYS
1 stop8h 15mUnited Airlines
Deal found 9/17$463
This Delta deal was found by Cheapflights users on 9/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/155:44 amTYS - BOI
1 stop8h 45mDelta
Sun 10/1911:39 pmBOI - TYS
1 stop7h 21mDelta
Deal found 9/17$467
This Delta deal was found by Cheapflights users on 9/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/162:27 pmTYS - BOI
2 stops11h 32mDelta
Sun 10/1911:39 pmBOI - TYS
1 stop7h 21mDelta
Deal found 9/17$472

Cheapflights Fare Finder

 
Customize your flight search to find flights from Knoxville to Boise 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 18, 2025.
Use the filters below to find and compare flights from Knoxville to Boise that are best for you.

Fly from

Knoxville

Fly to

Boise

Route

Depart

Return

Price

KnoxvilleBoise

TYS - BOI

TYSBOI

Knoxville McGhee Tyson

Thu 10/16

8:17 pm-11:43 am

1 stop17h 26m

Boise Air Term. Gowen Fld

Sun 10/19

12:28 pm-7:32 pm

1 stop29h 04m

$347

KnoxvilleBoise

TYS - BOI

TYSBOI

Knoxville McGhee Tyson

Sat 11/8

4:50 pm-10:37 pm

1 stop7h 47m

Boise Air Term. Gowen Fld

Tue 11/11

6:15 am-2:43 pm

1 stop6h 28m

$389

KnoxvilleBoise

TYS - BOI

TYSBOI

Knoxville McGhee Tyson

Fri 10/31

11:45 am-7:53 pm

2 stops10h 08m

Boise Air Term. Gowen Fld

Sun 11/2

7:00 am-3:37 pm

1 stop6h 37m

$418

KnoxvilleBoise

TYS - BOI

TYSBOI

Knoxville McGhee Tyson

Fri 10/17

6:04 pm-11:56 pm

1 stop7h 52m

Boise Air Term. Gowen Fld

Fri 10/24

11:39 pm-10:28 am

1 stop8h 49m

$437

KnoxvilleBoise

TYS - BOI

TYSBOI

Knoxville McGhee Tyson

Thu 10/30

7:11 am-12:29 pm

1 stop7h 18m

Boise Air Term. Gowen Fld

Sun 11/2

11:39 pm-9:00 am

1 stop7h 21m

$437

KnoxvilleBoise

TYS - BOI

TYSBOI

Knoxville McGhee Tyson

Fri 10/17

6:00 am-12:45 pm

1 stop8h 45m

Boise Air Term. Gowen Fld

Fri 10/24

1:28 pm-12:23 am

1 stop8h 55m

$437

KnoxvilleBoise

TYS - BOI

TYSBOI

Knoxville McGhee Tyson

Sat 10/18

7:00 am-11:39 am

1 stop6h 39m

Boise Air Term. Gowen Fld

Sun 10/19

12:35 pm-10:50 pm

1 stop8h 15m

$463

KnoxvilleBoise

TYS - BOI

TYSBOI

Knoxville McGhee Tyson

Wed 10/15

5:44 am-12:29 pm

1 stop8h 45m

Boise Air Term. Gowen Fld

Sun 10/19

11:39 pm-9:00 am

1 stop7h 21m

$467

KnoxvilleBoise

TYS - BOI

TYSBOI

Knoxville McGhee Tyson

Thu 9/25

8:40 pm-11:37 am

1 stop16h 57m

$170

KnoxvilleBoise

TYS - BOI

TYSBOI

Knoxville McGhee Tyson

Thu 10/30

7:17 pm-9:09 pm

2 stops27h 52m

$191

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 17 results
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Best time to book a flight from Knoxville to Boise

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

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

Currently, October is the cheapest month in which you can book a flight from Knoxville to Boise (average of $314). Flying from Knoxville to Boise 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.

Reviews of airlines servicing Boise

Get insights into the airlines that provide service to Boise. 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 Boise. Reviews last updated September 18, 2025.
Read through reviews of airlines operating flights from Knoxville to Boise, such as Delta, United Airlines, and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,961 reviews

Crew

8.5

Boarding

8.2

Overall

8.0

Food

7.3

Comfort

7.9

Entertainment

7.9

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
7,961 reviews
Delta
8.0
Very good
7,961 reviews

Crew

8.5

Boarding

8.2

Overall

8.0

Food

7.3

Comfort

7.9

Entertainment

7.9

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
8,926 reviews
Delta
8.0
Very good
7,961 reviews

Crew

8.5

Boarding

8.2

Overall

8.0

Food

7.3

Comfort

7.9

Entertainment

7.9

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
7,961 reviews

Crew

8.5

Boarding

8.2

Overall

8.0

Food

7.3

Comfort

7.9

Entertainment

7.9

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 Boise. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Knoxville to Boise?

    For as low as $389, Frontier can have you in Boise from Knoxville in 7h 47m. Knoxville and Boise are separated by a distance of 1782 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines flying from Knoxville to Boise round-trip?

    Cheapflights users have booked flights from Knoxville to Boise round-trip from $172. Other airlines that can offer you cheap pricing are Delta, from $269, and United Airlines, from $313. American Airlines is 64% cheaper than the average price of flights available within the next 90 days to this destination.

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

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

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

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

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

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

    Currently, October is the cheapest month in which you can book a flight from Knoxville to Boise (average of $314). Flying from Knoxville to Boise 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

Traveling to a place near Boise?

Book flights to Boise if you plan to visit one of these locations
Ontario
Meridian
Nampa
Caldwell
McCall

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Top 3 airlines flying from Knoxville to Boise

Discover the top 3 airlines that operate flights from Knoxville to Boise. 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 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$172Average$388FlexibilityNo cancel feeOn-time71%
DeltaCheapest$269Average$384FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$313Average$508FlexibilityNo cancel feeOn-time69%

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