HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Knoxville

$168+ Cheap flights from Idaho Falls to Knoxville (IDA - TYS)

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 9/15. Fares are subject to change and may not be available on all flights or dates of travel.
IDA — TYS
Aug 19 — Aug 261
Tue 8/19
Tue 8/26
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Idaho Falls to Knoxville 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 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 August 14, 2025.

Round-trip from

$727
(American Airlines)

One-way from

$168
(Kiwi.com)

Popular in

February

Cheapest in

April

Average price

$749
From Idaho Falls Fanning Field to Knoxville McGhee Tyson
Search Deals
One-way flight from Idaho Falls Fanning Field to Knoxville McGhee Tyson
Search Deals
Highest demand for flights based on searches. 29% potential increase in price ($265 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease ($46 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2025
Search Deals

Find 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 August 14, 2025.

This United Airlines deal was found by Cheapflights users on 8/14. 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 8/175:00 amIDA - TYS
1 stop8h 04mUnited Airlines
Tue 8/198:52 amTYS - IDA
1 stop6h 38mUnited Airlines
Deal found 8/14$711
This American Airlines deal was found by Cheapflights users on 8/14. 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 10/31:35 pmIDA - TYS
1 stop8h 46mAmerican Airlines
Sun 10/126:00 amTYS - IDA
1 stop8h 41mAmerican Airlines
Deal found 8/14$727
This United Airlines deal was found by Cheapflights users on 8/14. 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 10/35:56 pmIDA - TYS
2 stops26h 54mUnited Airlines
Sun 10/127:00 amTYS - IDA
2 stops28h 48mUnited Airlines
Deal found 8/14$869
This American Airlines deal was found by Cheapflights users on 8/14. 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 12/21:58 pmIDA - TYS
1 stop7h 54mAmerican Airlines
Wed 12/105:46 amTYS - IDA
1 stop8h 41mAmerican Airlines
Deal found 8/14$905

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 August 14, 2025.
Use the filters below to find and compare flights from Idaho Falls to Knoxville that are best for you.

Fly from

Idaho Falls

Fly to

Knoxville

Route

Depart

Return

Price

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Fri 10/3

1:35 pm-12:21 am

1 stop8h 46m

Knoxville McGhee Tyson

Sun 10/12

6:00 am-12:41 pm

1 stop8h 41m

$727

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Fri 10/3

5:56 pm-10:50 pm

2 stops26h 54m

Knoxville McGhee Tyson

Sun 10/12

7:00 am-9:48 am

2 stops28h 48m

$869

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Tue 12/2

1:58 pm-11:52 pm

1 stop7h 54m

Knoxville McGhee Tyson

Wed 12/10

5:46 am-12:27 pm

1 stop8h 41m

$905

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Mon 9/15

9:39 pm-3:41 pm

2 stops40h 02m

$168

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Fri 9/12

10:55 pm-11:18 am

3 stops34h 23m

$219

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Tue 9/16

5:00 am-3:10 pm

1 stop8h 10m

$276

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Sat 8/30

7:00 am-5:49 pm

1 stop8h 49m

$286

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Sat 9/20

5:00 am-2:50 pm

1 stop7h 50m

$291

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Sat 9/13

5:00 am-2:50 pm

1 stop7h 50m

$291

Idaho FallsKnoxville

IDA - TYS

IDATYS

Idaho Falls Fanning Field

Wed 9/17

1:35 pm-12:21 am

1 stop8h 46m

$301

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/14

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 August 14, 2025.
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
8,916 reviews

Crew

8.1

Comfort

7.3

Boarding

7.7

Overall

7.4

Entertainment

7.1

Food

6.6

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!
United Airlines
7.4
Good
8,916 reviews
United Airlines
7.4
Good
8,916 reviews

Crew

8.1

Comfort

7.3

Boarding

7.7

Overall

7.4

Entertainment

7.1

Food

6.6

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!
American Airlines
7.2
Good
10,000 reviews
United Airlines
7.4
Good
8,916 reviews

Crew

8.1

Comfort

7.3

Boarding

7.7

Overall

7.4

Entertainment

7.1

Food

6.6

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!

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.

  • 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 $388. American Airlines is currently priced 53% 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, January is the cheapest month in which you can book a flight from Idaho Falls to Knoxville (average of $294). Flying from Idaho Falls to Knoxville in March is currently the most expensive (average of $376). 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
Morristown
Cherokee
Corbin
Alcoa
Oak Ridge
Murphy

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.

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 August 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$288Average$505FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$388Average$663FlexibilityNo 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.