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$347+ Cheap flights from Idaho Falls to Knoxville (IDA - TYS)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/1. Fares are subject to change and may not be available on all flights or dates of travel.
IDA — TYS
Aug 22 — Aug 291
Sat 8/22
Sat 8/29
1 adult, Economy
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Cheap flight deals from Idaho Falls to Knoxville

Cheapest flights from Idaho Falls to Knoxville
Explore the most affordable flight options available from Idaho Falls to Knoxville. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 23, 2026.

This Kiwi.com deal was found by Cheapflights users on 7/17. 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.
Sun 11/19:02 am
IDA
-
TYS
1 stop11h 08m
Allegiant Air
Sun 11/158:43 pm
TYS
-
IDA
1 stop18h 10m
Allegiant Air
Deal found 7/17$347
This United Airlines deal was found by Cheapflights users on 7/18. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/192:25 pm
IDA
-
TYS
1 stop6h 04m
United Airlines
Sat 8/299:00 am
TYS
-
IDA
1 stop6h 29m
United Airlines
Deal found 7/18$349
This United Airlines deal was found by Cheapflights users on 7/19. 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.
Tue 8/182:25 pm
IDA
-
TYS
1 stop6h 04m
United Airlines
Mon 8/245:45 am
TYS
-
IDA
2 stops11h 38m
United Airlines
Deal found 7/19$367
This Delta deal was found by Cheapflights users on 7/21. 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.
Tue 8/1111:35 am
IDA
-
TYS
2 stops9h 25m
Delta
Tue 8/187:15 am
TYS
-
IDA
2 stops13h 05m
Delta
Deal found 7/21$369
This Kiwi.com deal was found by Cheapflights users on 7/17. 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.
Sun 11/19:02 am
IDA
-
TYS
1 stop11h 08m
Multiple Airlines
Sun 11/156:30 am
TYS
-
IDA
2 stops38h 27m
Multiple Airlines
Deal found 7/17$412
This United Airlines deal was found by Cheapflights users on 7/22. 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.
Wed 9/97:00 am
IDA
-
TYS
2 stops11h 24m
United Airlines
Sat 9/126:00 am
TYS
-
IDA
1 stop7h 39m
United Airlines
Deal found 7/22$424
This American Airlines deal was found by Cheapflights users on 7/21. 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 8/112:20 pm
IDA
-
TYS
1 stop6h 58m
American Airlines
Tue 8/186:03 am
TYS
-
IDA
1 stop7h 27m
American Airlines
Deal found 7/21$444
This American Airlines deal was found by Cheapflights users on 7/19. 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 8/182:20 pm
IDA
-
TYS
1 stop6h 58m
American Airlines
Mon 8/246:03 am
TYS
-
IDA
1 stop7h 27m
American Airlines
Deal found 7/19$445
This Delta deal was found by Cheapflights users on 7/18. 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.
Wed 8/197:00 pm
IDA
-
TYS
2 stops12h 36m
Delta
Sat 8/297:15 am
TYS
-
IDA
2 stops13h 05m
Delta
Deal found 7/18$448
This United Airlines deal was found by Cheapflights users on 7/18. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/42:32 pm
IDA
-
TYS
1 stop6h 06m
United Airlines
Fri 11/139:00 am
TYS
-
IDA
1 stop8h 23m
United Airlines
Deal found 7/18$467

Find flight deals from Idaho Falls to Knoxville

Discover tips and strategies to find the most affordable flight options for your journey from Idaho Falls (IDA) to Knoxville (TYS). 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 July 23, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$347
(Kiwi.com)

Popular in

February

Cheapest in

November

Average price

$510
Provider with most accurate pricing for Idaho Falls Fanning Field-Knoxville McGhee Tyson flight deals.
Search Deals
Provider most trusted by Cheapflights users for Idaho Falls Fanning Field-Knoxville McGhee Tyson flights.
Search Deals
From Idaho Falls Fanning Field to Knoxville McGhee Tyson
Search Deals
Highest demand for flights based on searches. 34% potential increase in price ($376 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 13% potential price decrease ($86 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Idaho Falls to Knoxville 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 July 23, 2026.
Use the filters below to find and compare flights from Idaho Falls to Knoxville that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Wed 8/19

7:00 am-3:54 pm

1 stop6h 54m

Knoxville McGhee Tyson

Sat 8/29

7:15 am-3:23 pm

2 stops10h 08m

$354

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Tue 8/18

2:25 pm-10:29 pm

1 stop6h 04m

Knoxville McGhee Tyson

Mon 8/24

5:45 am-3:23 pm

2 stops11h 38m

$367

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Wed 9/9

7:00 am-8:24 pm

2 stops11h 24m

Knoxville McGhee Tyson

Sat 9/12

6:00 am-11:39 am

1 stop7h 39m

$424

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Wed 8/19

7:00 pm-9:36 am

2 stops12h 36m

Knoxville McGhee Tyson

Sat 8/29

7:15 am-6:20 pm

2 stops13h 05m

$448

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Wed 11/4

2:32 pm-10:38 pm

1 stop6h 06m

Knoxville McGhee Tyson

Fri 11/13

9:00 am-3:23 pm

1 stop8h 23m

$467

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Thu 8/13

6:00 am-6:52 pm

2 stops10h 52m

Knoxville McGhee Tyson

Thu 8/20

12:01 pm-6:20 pm

2 stops8h 19m

$524

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Mon 10/19

1:50 pm-11:05 am

1 stop19h 15m

Knoxville McGhee Tyson

Mon 10/26

7:13 pm-1:20 pm

1 stop20h 07m

$528

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Thu 8/13

2:25 pm-10:29 pm

1 stop6h 04m

Knoxville McGhee Tyson

Thu 8/20

5:45 am-3:23 pm

2 stops11h 38m

$534

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Wed 9/9

7:00 am-4:42 pm

1 stop7h 42m

Knoxville McGhee Tyson

Sat 9/12

6:00 am-11:45 am

1 stop7h 45m

$539
Quickest round-trip

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Thu 8/13

2:20 pm-11:18 pm

1 stop6h 58m

Knoxville McGhee Tyson

Thu 8/20

6:03 am-11:30 am

1 stop7h 27m

$539

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/22

Showing 1-10 of 13 resultsSorted by cheapest first
1
2
  • Most accurate provider: When it comes to deals on Idaho Falls-Knoxville flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Idaho Falls-Knoxville flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Idaho Falls-Knoxville flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Idaho Falls-Knoxville flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Idaho Falls-Knoxville flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Idaho Falls to Knoxville

Have a flexible travel schedule? Discover the best time to fly to Knoxville from Idaho Falls 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.

Reviews of airlines servicing Knoxville

Get insights into the airlines that provide service to Knoxville. 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 Knoxville. Reviews last updated July 23, 2026.
Peruse reviews from past customers who have flown with United Airlines and American Airlines from Idaho Falls to Knoxville to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
10,020 reviews

Crew

8.1

Food

6.7

Overall

7.4

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Reviews

1 / 20
6.0
Good

ROHIT,Jun 2026

IND - EWR

It should not be delayed by 2 hours. I missed the important event due to this
United Airlines
7.4
Good
10,020 reviews
United Airlines
7.4
Good
10,020 reviews

Crew

8.1

Food

6.7

Overall

7.4

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Reviews

1 / 20
6.0
Good

ROHIT,Jun 2026

IND - EWR

It should not be delayed by 2 hours. I missed the important event due to this
American Airlines
7.1
Good
11,834 reviews
United Airlines
7.4
Good
10,020 reviews

Crew

8.1

Food

6.7

Overall

7.4

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Reviews

1 / 20
6.0
Good

ROHIT,Jun 2026

IND - EWR

It should not be delayed by 2 hours. I missed the important event due to this

Related info for your journey

Find useful and relevant information for your journey from Idaho Falls to Knoxville. 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 Idaho Falls to Knoxville?

    There are many flights that can get you from Idaho Falls to Knoxville in 6h 54m. Fly via United Airlines or Delta to get the fastest option. Idaho Falls and Knoxville are separated by a distance of 1575 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    Our cheapest airline available from Idaho Falls to Knoxville is United Airlines. Our recent data shows that you can find tickets from as low as $376 on this airline. An additional option worth looking into is American Airlines, starting at $393. United Airlines is currently priced 47% below the average price you’ll pay for this route.

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

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

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

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

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

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

See more FAQs

Traveling to a place near Knoxville?

Book flights to Knoxville if you plan to visit one of these locations
Cherokee
Crossville
Morristown
Bryson City
Murphy
Alcoa

Browse thousands of different options on Cheapflights for your next trip

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Top 2 airlines flying from Idaho Falls to Knoxville

Discover the top 2 airlines that operate flights from Idaho Falls to Knoxville. 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 July 23, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$376Average$548FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$393Average$680FlexibilityNo cancel feeOn-time71%

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