$404+ 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 12/31. Fares are subject to change and may not be available on all flights or dates of travel.
TYS — IDA
Sep 18 — Sep 251
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Knoxville to Idaho Falls 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 Knoxville to Idaho Falls
Cheapest
Best
Last-minute
Cheapest flights from Knoxville to Idaho FallsExplore 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 19, 2026.
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 19, 2026.
This American Airlines deal was found by Cheapflights users on 8/17. 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.
Thu 12/315:30 am -
2 stops13h 50m
Tue 1/55:50 pm -
2 stops13h 52m
Deal found 8/17![American Airlines logo]()
$404
This United Airlines deal was found by Cheapflights users on 8/15. 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 9/59:00 am -
1 stop6h 29m
Sat 9/127:00 am -
2 stops11h 24m
Deal found 8/15![United Airlines logo]()
$434
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.
Sat 10/249:45 am -
2 stops13h 09m
Wed 10/282:35 pm -
1 stop5h 54m
Deal found 8/13![United Airlines logo]()
$464
This American Airlines deal was found by Cheapflights users on 8/15. 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 8/15![American Airlines logo]()
$489
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.
Sat 8/294:00 pm -
1 stop7h 20m
Sun 9/62:20 pm -
1 stop6h 58m
Deal found 8/14![American Airlines logo]()
$532
Best flights from Knoxville to Idaho FallsDiscover carefully curated flight deals from Knoxville to Idaho Falls that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 19, 2026.
Discover carefully curated flight deals from Knoxville to Idaho Falls that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 19, 2026.
This United Airlines deal was found by Cheapflights users on 8/15. 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 9/59:00 am -
1 stop6h 29m
Sat 9/127:00 am -
2 stops11h 24m
Deal found 8/15![United Airlines logo]()
$434
This United Airlines deal was found by Cheapflights users on 8/16. 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 1/264:25 pm -
1 stop6h 43m
Sat 1/302:35 pm -
1 stop5h 45m
Deal found 8/16![United Airlines logo]()
$459
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.
Sat 10/248:30 am -
2 stops14h 24m
Wed 10/282:35 pm -
1 stop5h 54m
Deal found 8/14![United Airlines logo]()
$464
Last-minute flights from Knoxville to Idaho FallsDiscover last-minute flight deals from Knoxville to Idaho Falls. Data last updated August 19, 2026 and is based on user searches.
Discover last-minute flight deals from Knoxville to Idaho Falls. Data last updated August 19, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 8/17. 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.
Thu 8/276:03 am -
1 stop7h 27m
Sun 9/62:20 pm -
1 stop6h 58m
Deal found 8/17![American Airlines logo]()
$577
This American Airlines deal was found by Cheapflights users on 8/15. 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 8/15![American Airlines logo]()
$489
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.
Sat 8/294:00 pm -
1 stop7h 20m
Sun 9/62:20 pm -
1 stop6h 58m
Deal found 8/14![American Airlines logo]()
$532
This United Airlines deal was found by Cheapflights users on 8/15. 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 9/59:00 am -
1 stop6h 29m
Sat 9/127:00 am -
2 stops11h 24m
Deal found 8/15![United Airlines logo]()
$434
This United Airlines deal was found by Cheapflights users on 8/16. 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 9/124:50 pm -
1 stop6h 28m
Sat 9/1912:20 pm -
1 stop8h 29m
Deal found 8/16![United Airlines logo]()
$589
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 19, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $404 (American Airlines) |
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 19, 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
Cheapest round-trip
KnoxvilleIdaho Falls
TYS Knoxville McGhee Tyson - IDA Idaho Falls Fanning Field
TYSIDA
Knoxville McGhee Tyson
Sat 9/5
9:00 am-1:29 pm
1 stop6h 29m
Idaho Falls Fanning Field
Sat 9/12
7:00 am-8:24 pm
2 stops11h 24m
$434
Quickest round-trip
KnoxvilleIdaho Falls
TYS Knoxville McGhee Tyson - IDA Idaho Falls Fanning Field
TYSIDA
Knoxville McGhee Tyson
Tue 1/26
4:25 pm-9:08 pm
1 stop6h 43m
Idaho Falls Fanning Field
Sat 1/30
2:35 pm-10:20 pm
1 stop5h 45m
$459
KnoxvilleIdaho Falls
TYS Knoxville McGhee Tyson - IDA Idaho Falls Fanning Field
TYSIDA
Knoxville McGhee Tyson
Sat 10/24
8:30 am-8:54 pm
2 stops14h 24m
Idaho Falls Fanning Field
Wed 10/28
2:35 pm-10:29 pm
1 stop5h 54m
$464
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.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- 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.
TYS-IDA
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 19, 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.
Comfort
7.3
Crew
8.1
Entertainment
7.1
Food
6.7
Boarding
7.7
Overall
7.4
Reviews
1 / 20
4.0
OkayChris,Aug 2026
MIA - ORD
Comfort
7.3
Crew
8.1
Entertainment
7.1
Food
6.7
Boarding
7.7
Overall
7.4
Reviews
1 / 20
4.0
OkayChris,Aug 2026
MIA - ORD
Comfort
7.3
Crew
8.1
Entertainment
7.1
Food
6.7
Boarding
7.7
Overall
7.4
Reviews
1 / 20
4.0
OkayChris,Aug 2026
MIA - ORD
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.
Traveling to a place near Idaho Falls?
Book flights to Idaho Falls if you plan to visit one of these locationsRexburg
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
Idaho Falls flight routes
Other flight options
Other flights from Knoxville
Popular flights
Alternative routes for Knoxville to Idaho Falls
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Idaho Falls by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Knoxville to Idaho Falls by cabin class
Find flights from Knoxville to Idaho Falls, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Other flights to Idaho Falls
Explore flights to Idaho Falls departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on August 19, 2026.
Knoxville and Idaho Falls flights
Browse other Knoxville and Idaho Falls flight options. Last updated on August 19, 2026.
Other flights from Knoxville
Browse through other flights departing from Knoxville. Flights are based on user searches made on Cheapflights and were last updated on August 19, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
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 19, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$416 | Average$633 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$559 | Average$730 | FlexibilityNo cancel fee | On-time71% |