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Idaho Falls

$429+ Cheap flights from Knoxville to Idaho Falls (TYS - IDA)

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 8/25. Fares are subject to change and may not be available on all flights or dates of travel.
TYS — IDA
Sep 12 — Sep 191
Sat 9/12
Sat 9/19
1 adult, Economy
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Cheap flight deals from Knoxville to Idaho Falls

Cheapest flights from Knoxville to Idaho Falls
Explore the most affordable flight options available from Knoxville to Idaho Falls. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 13, 2026.

This American Airlines deal was found by Cheapflights users on 8/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/256:03 am -
1 stop7h 27m
Sat 8/2912:06 pm -
1 stop7h 47m
Deal found 8/9$429
This United Airlines deal was found by Cheapflights users on 8/9. 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.
Tue 8/257:15 am -
2 stops8h 14m
Sat 8/292:25 pm -
1 stop6h 04m
Deal found 8/9$434
This American Airlines deal was found by Cheapflights users on 8/13. 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 10/236:00 am -
1 stop9h 09m
Sun 10/251:39 pm -
1 stop7h 39m
Deal found 8/13$458
This United Airlines deal was found by Cheapflights users on 8/13. 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 8/281:00 pm -
2 stops10h 18m
Tue 9/12:25 pm -
1 stop6h 04m
Deal found 8/13$459
This United Airlines deal was found by Cheapflights users on 8/11. 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 10/2410:42 am -
2 stops12h 12m
Wed 10/282:35 pm -
1 stop5h 54m
Deal found 8/11$464
This United Airlines deal was found by Cheapflights users on 8/13. 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 10/239:00 am -
1 stop8h 24m
Sun 11/12:35 pm -
1 stop5h 54m
Deal found 8/13$482
This American Airlines deal was found by Cheapflights users on 8/12. 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.
Sat 8/296:03 am -
1 stop7h 27m
Tue 9/82:20 pm -
1 stop6h 58m
Deal found 8/12$489
This United Airlines deal was found by Cheapflights users on 8/13. 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 9/139:00 am -
1 stop6h 29m
Sat 9/1912:20 pm -
1 stop8h 29m
Deal found 8/13$519

Find flight deals from Knoxville to Idaho Falls

Discover tips and strategies to find the most affordable flight options for your journey from Knoxville (TYS) to Idaho Falls (IDA). 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 13, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$429
(American Airlines)
Provider with most accurate pricing for Knoxville McGhee Tyson-Idaho Falls Fanning Field flight deals.
Search Deals
Provider most trusted by Cheapflights users for Knoxville McGhee Tyson-Idaho Falls Fanning Field flights.
Search Deals
From Knoxville McGhee Tyson to Idaho Falls Fanning Field
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Knoxville to Idaho Falls 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 13, 2026.
Use the filters below to find and compare flights from Knoxville to Idaho Falls that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

KnoxvilleIdaho Falls

TYS Knoxville McGhee Tyson - IDA Idaho Falls Fanning Field

TYSIDA

Knoxville McGhee Tyson

Tue 8/25

7:15 am-1:29 pm

2 stops8h 14m

Idaho Falls Fanning Field

Sat 8/29

2:25 pm-10:29 pm

1 stop6h 04m

$434

KnoxvilleIdaho Falls

TYS Knoxville McGhee Tyson - IDA Idaho Falls Fanning Field

TYSIDA

Knoxville McGhee Tyson

Fri 8/28

1:00 pm-9:18 pm

2 stops10h 18m

Idaho Falls Fanning Field

Tue 9/1

2:25 pm-10:29 pm

1 stop6h 04m

$459

KnoxvilleIdaho Falls

TYS Knoxville McGhee Tyson - IDA Idaho Falls Fanning Field

TYSIDA

Knoxville McGhee Tyson

Sat 10/24

9:45 am-8:54 pm

2 stops13h 09m

Idaho Falls Fanning Field

Wed 10/28

2:35 pm-10:29 pm

1 stop5h 54m

$464

KnoxvilleIdaho Falls

TYS Knoxville McGhee Tyson - IDA Idaho Falls Fanning Field

TYSIDA

Knoxville McGhee Tyson

Sat 8/29

1:53 pm-9:20 pm

1 stop9h 27m

Idaho Falls Fanning Field

Tue 9/8

2:20 pm-11:18 pm

1 stop6h 58m

$489

KnoxvilleIdaho Falls

TYS Knoxville McGhee Tyson - IDA Idaho Falls Fanning Field

TYSIDA

Knoxville McGhee Tyson

Wed 9/30

2:43 pm-9:20 pm

1 stop8h 37m

Idaho Falls Fanning Field

Sun 10/4

2:08 pm-11:22 pm

1 stop7h 14m

$525
Cheapest one-way
Quickest one-way

KnoxvilleIdaho Falls

TYS Knoxville McGhee Tyson - IDA Idaho Falls Fanning Field

TYSIDA

Knoxville McGhee Tyson

Fri 8/21

9:00 am-1:29 pm

1 stop6h 29m

$459

KnoxvilleIdaho Falls

TYS Knoxville McGhee Tyson - IDA Idaho Falls Fanning Field

TYSIDA

Knoxville McGhee Tyson

Mon 8/31

9:00 am-1:29 pm

1 stop6h 29m

$459

KnoxvilleIdaho Falls

TYS Knoxville McGhee Tyson - IDA Idaho Falls Fanning Field

TYSIDA

Knoxville McGhee Tyson

Mon 8/31

6:00 am-1:24 pm

3 stops33h 24m

$562

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/9

Sorted by cheapest first

Compare providers for flights from Knoxville to Idaho Falls

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Knoxville to Idaho Falls in August.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Knoxville-Idaho Falls flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Knoxville-Idaho Falls flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Knoxville-Idaho Falls flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Knoxville-Idaho Falls 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 Knoxville-Idaho Falls 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 Knoxville to Idaho Falls

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

Reviews of airlines servicing Idaho Falls

Get insights into the airlines that provide service to Idaho Falls. 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 Idaho Falls. Reviews last updated August 13, 2026.
Get a feel of what it's like to fly with United Airlines and American Airlines from Knoxville to Idaho Falls by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
10,111 reviews

Entertainment

7.1

Comfort

7.3

Crew

8.1

Food

6.7

Overall

7.4

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Chris,Aug 2026

MIA - ORD

Had to go through TSA again, already purchased bottle drink. TSA would not let through, United changed gates last minute. This experience bad for everyone. Staff rude, not our fault. Staff from Chicago to Wichita excellent!
United Airlines
7.4
Good
10,111 reviews
United Airlines
7.4
Good
10,111 reviews

Entertainment

7.1

Comfort

7.3

Crew

8.1

Food

6.7

Overall

7.4

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Chris,Aug 2026

MIA - ORD

Had to go through TSA again, already purchased bottle drink. TSA would not let through, United changed gates last minute. This experience bad for everyone. Staff rude, not our fault. Staff from Chicago to Wichita excellent!
American Airlines
7.1
Good
11,923 reviews
United Airlines
7.4
Good
10,111 reviews

Entertainment

7.1

Comfort

7.3

Crew

8.1

Food

6.7

Overall

7.4

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Chris,Aug 2026

MIA - ORD

Had to go through TSA again, already purchased bottle drink. TSA would not let through, United changed gates last minute. This experience bad for everyone. Staff rude, not our fault. Staff from Chicago to Wichita excellent!

Related info for your journey

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

    A quick flight from Knoxville to Idaho Falls can take about 7h 27m. American Airlines provides one of the quickest options available for as low as $429. Airlines will cover a distance of 1575 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    Currently priced at $288, American Airlines will fly you from Knoxville to Idaho Falls and back. In addition to American Airlines, many other airlines offer competitively priced options for your trip. Check Cheapflights for deals on United Airlines for as low as $439.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Knoxville to Idaho Falls 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 Idaho Falls?

Book flights to Idaho Falls if you plan to visit one of these locations
Rexburg

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Top 2 airlines flying from Knoxville to Idaho Falls

Discover the top 2 airlines that operate flights from Knoxville to Idaho Falls. 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 13, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$288Average$730FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$439Average$633FlexibilityNo cancel feeOn-time69%

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