$384+ 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 10/21. Fares are subject to change and may not be available on all flights or dates of travel.
TYS — IDA
Oct 16 — Oct 231
Round-trip
1 adult, Economy
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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
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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
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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 September 16, 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 September 16, 2026.
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Wed 10/219:00 am -
1 stop8h 21m
Sat 10/2410:35 am -
2 stops11h 24m
Deal found 9/16![United Airlines logo]()
$384
This United Airlines deal was found by Cheapflights users on 9/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/149:00 am -
1 stop6h 24m
Tue 10/202:28 pm -
1 stop5h 46m
Deal found 9/12![United Airlines logo]()
$406
This American Airlines deal was found by Cheapflights users on 9/15. 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.
Wed 10/286:00 am -
1 stop9h 09m
Wed 11/41:35 pm -
1 stop7h 57m
Deal found 9/15![American Airlines logo]()
$414
This United Airlines deal was found by Cheapflights users on 9/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/149:00 am -
1 stop6h 24m
Mon 10/192:28 pm -
1 stop5h 46m
Deal found 9/12![United Airlines logo]()
$425
This United Airlines deal was found by Cheapflights users on 9/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/247:15 am -
2 stops10h 09m
Thu 10/292:35 pm -
1 stop5h 57m
Deal found 9/12![United Airlines logo]()
$464
This United Airlines deal was found by Cheapflights users on 9/15. 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 11/149:00 am -
1 stop8h 38m
Tue 11/172:35 pm -
1 stop5h 57m
Deal found 9/15![United Airlines logo]()
$479
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 September 16, 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 September 16, 2026.
This United Airlines deal was found by Cheapflights users on 9/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/149:00 am -
1 stop6h 24m
Mon 10/192:28 pm -
1 stop5h 46m
Deal found 9/12![United Airlines logo]()
$425
This Delta deal was found by Cheapflights users on 9/13. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/152:38 pm -
2 stops9h 32m
Tue 10/206:56 pm -
2 stops12h 38m
Deal found 9/13![Delta logo]()
$425
This American Airlines deal was found by Cheapflights users on 9/13. 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.
Thu 10/153:00 pm -
1 stop8h 42m
Tue 10/201:50 pm -
1 stop8h 09m
Deal found 9/13![American Airlines logo]()
$518
This United Airlines deal was found by Cheapflights users on 9/13. 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.
Tue 10/139:00 am -
1 stop6h 24m
Mon 10/192:28 pm -
1 stop5h 46m
Deal found 9/13![United Airlines logo]()
$501
This Delta deal was found by Cheapflights users on 9/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/245:40 am -
2 stops8h 42m
Thu 10/296:56 pm -
2 stops12h 38m
Deal found 9/12![Delta logo]()
$550
This United Airlines deal was found by Cheapflights users on 9/14. 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.
Thu 10/159:00 am -
1 stop6h 24m
Tue 10/202:28 pm -
1 stop5h 46m
Deal found 9/14![United Airlines logo]()
$514
This American Airlines deal was found by Cheapflights users on 9/15. 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.
Tue 10/133:00 pm -
1 stop8h 42m
Sun 10/181:50 pm -
1 stop8h 09m
Deal found 9/15![American Airlines logo]()
$635
This United Airlines deal was found by Cheapflights users on 9/14. 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.
Tue 9/297:15 am -
2 stops10h 06m
Sat 10/32:28 pm -
1 stop5h 46m
Deal found 9/14![United Airlines logo]()
$560
This United Airlines deal was found by Cheapflights users on 9/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/139:00 am -
1 stop6h 24m
Sun 10/182:28 pm -
1 stop5h 46m
Deal found 9/12![United Airlines logo]()
$583
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Wed 9/309:00 am -
1 stop8h 21m
Sat 10/32:28 pm -
1 stop5h 46m
Deal found 9/16![United Airlines logo]()
$629
Last-minute flights from Knoxville to Idaho FallsDiscover last-minute flight deals from Knoxville to Idaho Falls. Data last updated September 16, 2026 and is based on user searches.
Discover last-minute flight deals from Knoxville to Idaho Falls. Data last updated September 16, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 9/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/149:00 am -
1 stop6h 24m
Tue 10/202:28 pm -
1 stop5h 46m
Deal found 9/12![United Airlines logo]()
$406
This United Airlines deal was found by Cheapflights users on 9/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/149:00 am -
1 stop6h 24m
Mon 10/192:28 pm -
1 stop5h 46m
Deal found 9/12![United Airlines logo]()
$425
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Thu 10/159:00 am -
1 stop6h 24m
Tue 10/202:28 pm -
1 stop5h 46m
Deal found 9/16![United Airlines logo]()
$479
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Wed 10/219:00 am -
1 stop8h 21m
Sat 10/2410:35 am -
2 stops11h 24m
Deal found 9/16![United Airlines logo]()
$384
This United Airlines deal was found by Cheapflights users on 9/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/247:15 am -
2 stops10h 09m
Thu 10/292:35 pm -
1 stop5h 57m
Deal found 9/12![United Airlines logo]()
$464
This American Airlines deal was found by Cheapflights users on 9/15. 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.
Wed 10/286:00 am -
1 stop9h 09m
Wed 11/41:35 pm -
1 stop7h 57m
Deal found 9/15![American Airlines logo]()
$414
One-way flights from Knoxville to Idaho FallsSearch for one-way flight options from Knoxville to Idaho Falls. Find affordable one-way fares based on user searches. Data last updated September 16, 2026.
Search for one-way flight options from Knoxville to Idaho Falls. Find affordable one-way fares based on user searches. Data last updated September 16, 2026.
This American Airlines deal was found by Cheapflights users on 9/13. 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 1/82:53 pm -
1 stop8h 59m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![American Airlines logo]()
$389
This Delta deal was found by Cheapflights users on 9/13. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/87:30 am -
2 stops12h 44m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![Delta logo]()
$394
This United Airlines deal was found by Cheapflights users on 9/13. 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 1/86:15 am -
3 stops16h 53m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![United Airlines logo]()
$399
This United Airlines deal was found by Cheapflights users on 9/14. 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.
Mon 9/284:53 pm -
1 stop6h 01m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/14![United Airlines logo]()
$469
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/285:15 pm -
3 stops31h 41m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/14![Multiple Airlines logo]()
$672
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 September 16, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $384 (United 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 7,457,451 searches. Data last updated September 16, 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
Fri 1/8
2:53 pm-9:52 pm
1 stop8h 59m
Idaho Falls Fanning Field
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$389
KnoxvilleIdaho Falls
TYS Knoxville McGhee Tyson - IDA Idaho Falls Fanning Field
TYSIDA
Knoxville McGhee Tyson
Fri 1/8
7:30 am-6:14 pm
2 stops12h 44m
Idaho Falls Fanning Field
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$394
KnoxvilleIdaho Falls
TYS Knoxville McGhee Tyson - IDA Idaho Falls Fanning Field
TYSIDA
Knoxville McGhee Tyson
Fri 1/8
6:15 am-9:08 pm
3 stops16h 53m
Idaho Falls Fanning Field
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$399
KnoxvilleIdaho Falls
TYS Knoxville McGhee Tyson - IDA Idaho Falls Fanning Field
TYSIDA
Knoxville McGhee Tyson
Wed 10/14
9:00 am-1:24 pm
1 stop6h 24m
Idaho Falls Fanning Field
Mon 10/19
2:28 pm-10:14 pm
1 stop5h 46m
$425
KnoxvilleIdaho Falls
TYS Knoxville McGhee Tyson - IDA Idaho Falls Fanning Field
TYSIDA
Knoxville McGhee Tyson
Thu 10/15
2:38 pm-10:10 pm
2 stops9h 32m
Idaho Falls Fanning Field
Tue 10/20
6:56 pm-9:34 am
2 stops12h 38m
$425
Quickest round-trip
KnoxvilleIdaho Falls
TYS Knoxville McGhee Tyson - IDA Idaho Falls Fanning Field
TYSIDA
Knoxville McGhee Tyson
Mon 9/28
4:53 pm-8:54 pm
1 stop6h 01m
Idaho Falls Fanning Field
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$469
KnoxvilleIdaho Falls
TYS Knoxville McGhee Tyson - IDA Idaho Falls Fanning Field
TYSIDA
Knoxville McGhee Tyson
Tue 10/13
9:00 am-1:24 pm
1 stop6h 24m
Idaho Falls Fanning Field
Mon 10/19
2:28 pm-10:14 pm
1 stop5h 46m
$501
KnoxvilleIdaho Falls
TYS Knoxville McGhee Tyson - IDA Idaho Falls Fanning Field
TYSIDA
Knoxville McGhee Tyson
Thu 10/15
9:00 am-1:24 pm
1 stop6h 24m
Idaho Falls Fanning Field
Tue 10/20
2:28 pm-10:14 pm
1 stop5h 46m
$514
KnoxvilleIdaho Falls
TYS Knoxville McGhee Tyson - IDA Idaho Falls Fanning Field
TYSIDA
Knoxville McGhee Tyson
Thu 10/15
3:00 pm-9:42 pm
1 stop8h 42m
Idaho Falls Fanning Field
Tue 10/20
1:50 pm-11:59 pm
1 stop8h 09m
$518
KnoxvilleIdaho Falls
TYS Knoxville McGhee Tyson - IDA Idaho Falls Fanning Field
TYSIDA
Knoxville McGhee Tyson
Sat 10/24
5:40 am-12:22 pm
2 stops8h 42m
Idaho Falls Fanning Field
Thu 10/29
6:56 pm-9:34 am
2 stops12h 38m
$550
Showing 1-10 of 15 resultsSorted 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 September.
| 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 September 16, 2026.
Get a feel of what it's like to fly with United 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.
Overall
7.4
Food
6.7
Crew
8.1
Boarding
7.7
Entertainment
7.1
Comfort
7.3
Reviews
1 / 20
8.0
ExcellentAsha,Sep 2026
LGA - IAH
Overall
7.4
Food
6.7
Crew
8.1
Boarding
7.7
Entertainment
7.1
Comfort
7.3
Reviews
1 / 20
8.0
ExcellentAsha,Sep 2026
LGA - IAH
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
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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 September 16, 2026.
Knoxville and Idaho Falls flights
Browse other Knoxville and Idaho Falls flight options. Last updated on September 16, 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 September 16, 2026.
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Check out other popular destinations found by fellow travelers in 2026
Top airline flying from Knoxville to Idaho Falls
Discover the top airline 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 7,457,451 searches. Data last updated September 16, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$416 | Average$615 | FlexibilityNo cancel fee | On-time69% |