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$399+ 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 10/27. Fares are subject to change and may not be available on all flights or dates of travel.
IDA — TYS
Mar 29 — Apr 51
Sun 3/29
Sun 4/5
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 February 27, 2026.

This United Airlines deal was found by Cheapflights users on 2/23. 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 10/277:00 am
IDA
-
TYS
1 stop5h 36m
United Airlines
Sat 10/314:25 pm
TYS
-
IDA
1 stop6h 43m
United Airlines
Deal found 2/23$399
This Alaska Airlines deal was found by Cheapflights users on 2/25. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/276:15 am
IDA
-
TYS
2 stops13h 30m
Alaska Airlines
Sat 10/316:00 am
TYS
-
IDA
2 stops11h 29m
Alaska Airlines
Deal found 2/25$549
This United Airlines deal was found by Cheapflights users on 2/24. 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 3/22:40 pm
IDA
-
TYS
1 stop5h 50m
United Airlines
Fri 3/134:18 pm
TYS
-
IDA
1 stop6h 48m
United Airlines
Deal found 2/24$609
This American Airlines deal was found by Cheapflights users on 2/25. 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.
Wed 4/81:43 pm
IDA
-
TYS
1 stop8h 13m
American Airlines
Sat 4/186:00 am
TYS
-
IDA
1 stop9h 13m
American Airlines
Deal found 2/25$619

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 February 27, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$619
(American Airlines)

Popular in

June

Cheapest in

April

Average price

$526
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.
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From Idaho Falls Fanning Field to Knoxville McGhee Tyson
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($49 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($31 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 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 February 27, 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

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Sun 5/10

1:43 pm-11:56 pm

1 stop8h 13m

Knoxville McGhee Tyson

Fri 5/15

6:00 am-1:13 pm

1 stop9h 13m

$626

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Tue 3/10

2:18 pm-11:20 pm

1 stop7h 02m

Knoxville McGhee Tyson

Sat 3/14

2:54 pm-11:24 pm

2 stops10h 30m

$667

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Tue 6/16

2:30 pm-10:19 pm

1 stop5h 49m

Knoxville McGhee Tyson

Sat 6/20

8:20 am-3:34 pm

2 stops9h 14m

$758

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Mon 6/15

2:30 pm-10:19 pm

1 stop5h 49m

Knoxville McGhee Tyson

Fri 6/19

8:20 am-5:19 pm

2 stops10h 59m

$802

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Fri 6/12

2:30 pm-3:53 pm

1 stop23h 23m

Knoxville McGhee Tyson

Wed 6/17

4:56 pm-1:25 pm

1 stop22h 29m

$812

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Tue 6/16

7:15 am-10:04 pm

2 stops12h 49m

Knoxville McGhee Tyson

Sat 6/20

1:14 pm-10:39 pm

2 stops11h 25m

$813

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Sat 6/13

4:10 pm-10:42 am

2 stops16h 32m

Knoxville McGhee Tyson

Wed 6/17

8:20 am-9:07 pm

2 stops14h 47m

$815

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Fri 3/27

2:35 pm-10:30 pm

1 stop5h 55m

Knoxville McGhee Tyson

Mon 3/30

4:30 pm-9:53 am

1 stop19h 23m

$819

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Fri 5/8

7:48 am-10:25 pm

2 stops12h 37m

Knoxville McGhee Tyson

Mon 5/11

3:58 pm-11:39 pm

2 stops9h 41m

$833

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/23

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.

Cheapflights Insights

Everything you need to know about your flight from Idaho Falls to Knoxville

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

Currently, April is the cheapest month in which you can book a flight from Idaho Falls to Knoxville (average of $288). Flying from Idaho Falls to Knoxville in March is currently the most expensive (average of $1,148). 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 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 February 27, 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
9,349 reviews

Entertainment

7.1

Boarding

7.7

Comfort

7.3

Food

6.6

Crew

8.1

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
United Airlines
7.4
Good
9,349 reviews
United Airlines
7.4
Good
9,349 reviews

Entertainment

7.1

Boarding

7.7

Comfort

7.3

Food

6.6

Crew

8.1

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
American Airlines
7.2
Good
11,357 reviews
United Airlines
7.4
Good
9,349 reviews

Entertainment

7.1

Boarding

7.7

Comfort

7.3

Food

6.6

Crew

8.1

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

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 5h 49m. Fly via American Airlines or United Airlines 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 American Airlines. Our recent data shows that you can find tickets from as low as $288 on this airline. An additional option worth looking into is United Airlines, starting at $373. American Airlines is currently priced 45% 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.

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

    Currently, April is the cheapest month in which you can book a flight from Idaho Falls to Knoxville (average of $288). Flying from Idaho Falls to Knoxville in March is currently the most expensive (average of $1,148). 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 Knoxville?

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

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 February 27, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$288Average$505FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$373Average$503FlexibilityNo cancel feeOn-time69%

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