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$349+ 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 8/21. Fares are subject to change and may not be available on all flights or dates of travel.
IDA — TYS
Aug 10 — Aug 171
Mon 8/10
Mon 8/17
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 11, 2026.

This United Airlines deal was found by Cheapflights users on 7/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/212:25 pm
IDA
-
TYS
1 stop6h 04m
United Airlines
Tue 8/259:00 am
TYS
-
IDA
1 stop6h 29m
United Airlines
Deal found 7/9$349
This United Airlines deal was found by Cheapflights users on 7/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/132:32 pm
IDA
-
TYS
1 stop6h 06m
United Airlines
Wed 11/187:00 am
TYS
-
IDA
2 stops10h 23m
United Airlines
Deal found 7/9$354
This United Airlines deal was found by Cheapflights users on 7/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/122:32 pm
IDA
-
TYS
1 stop6h 06m
United Airlines
Wed 11/185:45 am
TYS
-
IDA
2 stops11h 38m
United Airlines
Deal found 7/9$420
This Delta deal was found by Cheapflights users on 7/9. 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 8/217:00 pm
IDA
-
TYS
2 stops12h 33m
Delta
Tue 8/255:40 am
TYS
-
IDA
2 stops10h 55m
Delta
Deal found 7/9$448
This United Airlines deal was found by Cheapflights users on 7/7. 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 11/142:32 pm
IDA
-
TYS
1 stop6h 06m
United Airlines
Wed 11/185:45 am
TYS
-
IDA
2 stops11h 38m
United Airlines
Deal found 7/7$454
This United Airlines deal was found by Cheapflights users on 7/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/262:25 pm
IDA
-
TYS
1 stop6h 04m
United Airlines
Mon 8/317:15 am
TYS
-
IDA
2 stops10h 08m
United Airlines
Deal found 7/9$457
This United Airlines deal was found by Cheapflights users on 7/10. 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.
Fri 10/232:28 pm
IDA
-
TYS
1 stop5h 46m
United Airlines
Sat 10/319:00 am
TYS
-
IDA
1 stop8h 23m
United Airlines
Deal found 7/10$462

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 11, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$349
(United Airlines)

Popular in

February

Cheapest in

November

Average price

$510
Provider with most accurate pricing for Idaho Falls Fanning Field-Knoxville McGhee Tyson flight deals.
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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 ($379 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 13% potential price decrease ($87 potential savings vs. average RT price).
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Average for round-trip flights in July 2026
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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 11, 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

Fri 8/21

2:25 pm-10:29 pm

1 stop6h 04m

Knoxville McGhee Tyson

Tue 8/25

9:00 am-1:29 pm

1 stop6h 29m

$349

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Fri 8/21

7:00 pm-9:33 am

2 stops12h 33m

Knoxville McGhee Tyson

Tue 8/25

5:40 am-2:35 pm

2 stops10h 55m

$448

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Fri 9/4

2:25 pm-10:29 pm

1 stop6h 04m

Knoxville McGhee Tyson

Wed 9/9

7:15 am-3:23 pm

2 stops10h 08m

$611
Quickest round-trip

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Tue 7/21

2:30 pm-10:19 pm

1 stop5h 49m

Knoxville McGhee Tyson

Tue 7/28

4:56 pm-9:07 pm

1 stop6h 11m

$614

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Wed 8/26

10:35 am-9:45 pm

2 stops9h 10m

Knoxville McGhee Tyson

Mon 8/31

7:15 am-3:23 pm

2 stops10h 08m

$628

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Thu 9/3

2:25 pm-10:29 pm

1 stop6h 04m

Knoxville McGhee Tyson

Tue 9/8

4:50 pm-9:18 pm

1 stop6h 28m

$656
Cheapest one-way

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Sat 7/18

10:35 am-11:12 pm

2 stops10h 37m

$421
Quickest one-way

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Fri 7/24

2:30 pm-10:19 pm

1 stop5h 49m

$454

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Fri 7/17

10:35 am-11:12 pm

2 stops10h 37m

$459

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Thu 7/16

7:00 am-8:34 pm

2 stops11h 34m

$459

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/11

Sorted by cheapest first
  • 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 11, 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
9,976 reviews

Comfort

7.3

Food

6.7

Overall

7.4

Entertainment

7.1

Boarding

7.7

Crew

8.1

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
9,976 reviews
United Airlines
7.4
Good
9,976 reviews

Comfort

7.3

Food

6.7

Overall

7.4

Entertainment

7.1

Boarding

7.7

Crew

8.1

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
11,806 reviews
United Airlines
7.4
Good
9,976 reviews

Comfort

7.3

Food

6.7

Overall

7.4

Entertainment

7.1

Boarding

7.7

Crew

8.1

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 04m. 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 11, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$376Average$548FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$393Average$680FlexibilityNo cancel feeOn-time71%

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