$379+ 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 10/17. Fares are subject to change and may not be available on all flights or dates of travel.
IDA — TYS
Oct 5 — Oct 121
Round-trip
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
Cheapest
Best
Last-minute
One-way
Cheapest flights from Idaho Falls to KnoxvilleExplore 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 September 5, 2026.
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 September 5, 2026.
This United Airlines deal was found by Cheapflights users on 9/1. 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 9/162:25 pm -
1 stop6h 19m
Sat 10/179:00 am -
1 stop8h 24m
Deal found 9/1![United Airlines logo]()
$460
This American Airlines deal was found by Cheapflights users on 9/2. 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 10/21:58 pm -
1 stop18h 52m
Fri 10/95:07 pm -
1 stop22h 13m
Deal found 9/2![American Airlines logo]()
$638
This American Airlines deal was found by Cheapflights users on 9/4. 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 11/248:00 am -
1 stop8h 59m
Mon 11/302:54 pm -
1 stop8h 57m
Deal found 9/4![American Airlines logo]()
$808
This United Airlines deal was found by Cheapflights users on 9/5. 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 9/202:25 pm -
1 stop6h 19m
Thu 9/249:00 am -
1 stop8h 24m
Deal found 9/5![United Airlines logo]()
$937
Best flights from Idaho Falls to KnoxvilleDiscover carefully curated flight deals from Idaho Falls to Knoxville that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 5, 2026.
Discover carefully curated flight deals from Idaho Falls to Knoxville that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 5, 2026.
This United Airlines deal was found by Cheapflights users on 9/3. 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 1/307:00 am -
1 stop5h 36m
Wed 2/34:25 pm -
1 stop6h 43m
Deal found 9/3![United Airlines logo]()
$459
Last-minute flights from Idaho Falls to KnoxvilleDiscover last-minute flight deals from Idaho Falls to Knoxville. Data last updated September 5, 2026 and is based on user searches.
Discover last-minute flight deals from Idaho Falls to Knoxville. Data last updated September 5, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 9/2. 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 9/132:25 pm -
1 stop6h 19m
Wed 9/167:15 am -
2 stops10h 08m
Deal found 9/2![United Airlines logo]()
$944
This American Airlines deal was found by Cheapflights users on 9/2. 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.
Sun 9/132:08 pm -
1 stop7h 14m
Wed 9/166:00 am -
1 stop7h 45m
Deal found 9/2![American Airlines logo]()
$1,071
This United Airlines deal was found by Cheapflights users on 9/1. 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 9/162:25 pm -
1 stop6h 19m
Sat 10/179:00 am -
1 stop8h 24m
Deal found 9/1![United Airlines logo]()
$460
This United Airlines deal was found by Cheapflights users on 9/5. 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 9/202:25 pm -
1 stop6h 19m
Thu 9/249:00 am -
1 stop8h 24m
Deal found 9/5![United Airlines logo]()
$937
This American Airlines deal was found by Cheapflights users on 9/2. 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 10/21:58 pm -
1 stop18h 52m
Fri 10/95:07 pm -
1 stop22h 13m
Deal found 9/2![American Airlines logo]()
$638
One-way flights from Idaho Falls to KnoxvilleSearch for one-way flight options from Idaho Falls to Knoxville. Find affordable one-way fares based on user searches. Data last updated September 5, 2026.
Search for one-way flight options from Idaho Falls to Knoxville. Find affordable one-way fares based on user searches. Data last updated September 5, 2026.
This United Airlines deal was found by Cheapflights users on 9/3. 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 10/172:28 pm -
1 stop5h 46m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/3![United Airlines logo]()
$379
This Alaska Airlines deal was found by Cheapflights users on 9/3. 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.
Sat 10/176:09 am -
2 stops15h 09m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/3![Alaska Airlines logo]()
$384
This Kiwi.com deal was found by Cheapflights users on 9/3. 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.
Sat 10/176:09 am -
3 stops51h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/3![Multiple Airlines logo]()
$592
This United Airlines deal was found by Cheapflights users on 9/1. 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 12/232:37 pm -
1 stop6h 06m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/1![United Airlines logo]()
$1,070
This Delta deal was found by Cheapflights users on 9/1. 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 12/236:57 pm -
2 stops13h 14m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/1![Delta logo]()
$1,606
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 September 5, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $459 (United Airlines) |
One-way from | $379 (United Airlines) |
Popular in | February |
Cheapest in | November |
Average price | $548 |
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 7,457,451 searches. Data last updated September 5, 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
Cheapest round-trip
Quickest round-trip
Idaho FallsKnoxville
IDA Idaho Falls Fanning Field - TYS Knoxville McGhee Tyson
IDATYS
Idaho Falls Fanning Field
Sat 10/17
2:28 pm-10:14 pm
1 stop5h 46m
Knoxville McGhee Tyson
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$379
Idaho FallsKnoxville
IDA Idaho Falls Fanning Field - TYS Knoxville McGhee Tyson
IDATYS
Idaho Falls Fanning Field
Sat 10/17
6:09 am-11:18 pm
2 stops15h 09m
Knoxville McGhee Tyson
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$384
Idaho FallsKnoxville
IDA Idaho Falls Fanning Field - TYS Knoxville McGhee Tyson
IDATYS
Idaho Falls Fanning Field
Sat 1/30
7:00 am-2:36 pm
1 stop5h 36m
Knoxville McGhee Tyson
Wed 2/3
4:25 pm-9:08 pm
1 stop6h 43m
$459
Idaho FallsKnoxville
IDA Idaho Falls Fanning Field - TYS Knoxville McGhee Tyson
IDATYS
Idaho Falls Fanning Field
Sat 10/17
6:09 am-11:14 am
3 stops51h 05m
Knoxville McGhee Tyson
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$592
Idaho FallsKnoxville
IDA Idaho Falls Fanning Field - TYS Knoxville McGhee Tyson
IDATYS
Idaho Falls Fanning Field
Wed 12/23
6:57 pm-10:11 am
2 stops13h 14m
Knoxville McGhee Tyson
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$1,606
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.
IDA-TYS
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 September 5, 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.
Food
6.6
Overall
7.4
Comfort
7.3
Crew
8.1
Boarding
7.7
Entertainment
7.1
Reviews
1 / 20
4.0
OkayChris,Aug 2026
MIA - ORD
Food
6.6
Overall
7.4
Comfort
7.3
Crew
8.1
Boarding
7.7
Entertainment
7.1
Reviews
1 / 20
4.0
OkayChris,Aug 2026
MIA - ORD
Food
6.6
Overall
7.4
Comfort
7.3
Crew
8.1
Boarding
7.7
Entertainment
7.1
Reviews
1 / 20
4.0
OkayChris,Aug 2026
MIA - ORD
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.
Traveling to a place near Knoxville?
Book flights to Knoxville if you plan to visit one of these locationsCherokee
Crossville
Morristown
Bryson City
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.
Alternative routes
Complete your trip
Flights by cabin class
Knoxville flight routes
Other flight options
Other flights from Idaho Falls
Popular flights
Alternative routes for Idaho Falls to Knoxville
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Knoxville by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Idaho Falls to Knoxville by cabin class
Find flights from Idaho Falls to Knoxville, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Other flights to Knoxville
Explore flights to Knoxville departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 5, 2026.
Idaho Falls and Knoxville flights
Browse other Idaho Falls and Knoxville flight options. Last updated on September 5, 2026.
Other flights from Idaho Falls
Browse through other flights departing from Idaho Falls. Flights are based on user searches made on Cheapflights and were last updated on September 5, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
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 7,457,451 searches. Data last updated September 5, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$376 | Average$644 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$510 | Average$737 | FlexibilityNo cancel fee | On-time71% |