TYS - IDA

$261 Find Cheap Flights from Knoxville to Idaho Falls - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Knoxville to Idaho Falls departing on 8/8. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$359
Delta
Tue 10/20Tue 11/3
TYS - IDA • 2 stops
Cheapest one-way
$261
Multiple Airlines
Sat 8/8
TYS - IDA • 3 stops
Top airlines
Cheapest • from $359 (round-trip)
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Knoxville and Idaho Falls. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $553 (round-trip)
Shortest trip • 6h 38m (one-way)
Insights
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Booking Insights
Flight Deals

Cheap Flights from Knoxville to Idaho Falls (TYS-IDA)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Knoxville to Idaho Falls that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Knoxville to Idaho Falls

Tue, Oct 20 - Tue, Nov 3
Delta Logo
8:10 am - 6:16 pm
TYS
-
IDA
12h 06m
2 stops
Delta Logo
6:56 pm - 9:40 am
IDA
-
TYS
12h 44m
2 stops
$359Delta
Tue, Oct 20 - Sat, Oct 31
Delta Logo
8:10 am - 6:16 pm
TYS
-
IDA
12h 06m
2 stops
Delta Logo
6:00 am - 5:36 pm
IDA
-
TYS
9h 36m
2 stops
$385Delta
Thu, Oct 22 - Tue, Nov 3
Delta Logo
12:06 pm - 10:20 pm
TYS
-
IDA
12h 14m
2 stops
Delta Logo
1:05 pm - 11:12 pm
IDA
-
TYS
8h 07m
2 stops
$424Delta
Tue, Oct 20 - Sun, Nov 1
Delta Logo
8:10 am - 6:16 pm
TYS
-
IDA
12h 06m
2 stops
Delta Logo
6:56 pm - 9:40 am
IDA
-
TYS
12h 44m
2 stops
$445Delta
Sat, Oct 17 - Tue, Nov 3
United Airlines Logo
9:00 am - 3:24 pm
TYS
-
IDA
8h 24m
1 stop
United Airlines Logo
2:32 pm - 10:38 pm
IDA
-
TYS
6h 06m
1 stop
$449United Airlines
Wed, Nov 11 - Sat, Nov 14
United Airlines Logo
5:45 am - 3:23 pm
TYS
-
IDA
11h 38m
2 stops
United Airlines Logo
2:32 pm - 10:38 pm
IDA
-
TYS
6h 06m
1 stop
$454United Airlines
Wed, Nov 11 - Sat, Nov 14
United Airlines Logo
5:45 am - 3:23 pm
TYS
-
IDA
11h 38m
2 stops
United Airlines Logo
10:35 am - 11:56 pm
IDA
-
TYS
11h 21m
2 stops
$459United Airlines
Sat, Oct 17 - Wed, Nov 4
Delta Logo
6:00 am - 12:22 pm
TYS
-
IDA
8h 22m
2 stops
Delta Logo
1:05 pm - 11:12 pm
IDA
-
TYS
8h 07m
2 stops
$484Delta
Tue, Aug 25 - Sat, Aug 29
United Airlines Logo
7:15 am - 1:29 pm
TYS
-
IDA
8h 14m
2 stops
United Airlines Logo
2:25 pm - 10:29 pm
IDA
-
TYS
6h 04m
1 stop
$489United Airlines
Wed, Nov 11 - Sat, Nov 14
United Airlines Logo
5:45 am - 3:23 pm
TYS
-
IDA
11h 38m
2 stops
United Airlines Logo
10:35 am - 11:56 pm
IDA
-
TYS
11h 21m
2 stops
$494United Airlines
Booking Insights

KAYAK's insights & trends for Knoxville to Idaho Falls flights

Get data-powered insights and trends into flights from Knoxville to Idaho Falls to help you find the cheapest flights, the best time to fly and much more.

Which airlines provide the cheapest flights from Knoxville to Idaho Falls?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 5 days.

In the past 5 days, the cheapest round-trip tickets from Knoxville to Idaho Falls were found on Delta ($359) and United Airlines ($449).

Good to know

Cheapest flight$261
Flight from Knoxville to Idaho Falls

When to book flights from Knoxville to Idaho Falls

Are your dates flexible? Find out the best times to travel from Knoxville to Idaho Falls based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Knoxville to Idaho Falls

  • What is the cheapest flight from Knoxville to Idaho Falls?

    In the last 5 days, the lowest price for a flight from Knoxville to Idaho Falls was $261 for a one-way ticket and $359 for a round-trip.

  • Do I need a passport to fly between Knoxville and Idaho Falls?

    A passport is not required to fly from Knoxville to Idaho Falls.

  • Which airports will I be using when flying from Knoxville to Idaho Falls?

    Knoxville airport is called Knoxville McGhee Tyson and the only airport in Idaho Falls is Idaho Falls Fanning Field.

  • Which aircraft models fly most regularly from Knoxville to Idaho Falls?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Knoxville to Idaho Falls?

    oneworld, and Star Alliance are the airline alliances operating flights between Knoxville and Idaho Falls, with oneworld being the most commonly used for this route.

  • Which is the best airline for flights from Knoxville to Idaho Falls, United Airlines or American Airlines?

    The two airlines most popular with KAYAK users for flights from Knoxville to Idaho Falls are United Airlines and American Airlines. With an average price for the route of $633 and an overall rating of 7.4, United Airlines is the most popular choice. American Airlines is also a great choice for the route, with an average price of $575 and an overall rating of 7.1.

  • How does KAYAK find such low prices on flights from Knoxville to Idaho Falls?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Knoxville to Idaho Falls.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Knoxville to Idaho Falls?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Idaho Falls from Knoxville is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Knoxville to Idaho Falls?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Idaho Falls with an airline and back to Knoxville with another airline. Booking your flights between Knoxville and IDA can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Knoxville to Idaho Falls?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Idaho Falls from Knoxville up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airlines flying from Knoxville to Idaho Falls

 
See real verified KAYAK customer reviews for airlines flying from Knoxville to Idaho Falls. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Knoxville to Idaho Falls? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 9927 reviews
7.1Entertainment
6.7Food
8.1Crew
7.3Comfort
7.7Boarding
Airline reviews

Our flight to Rome, Italy was cancelled the day of and we were never informed. We only found out because I was trying to get into my husbands account and called to get his account number. Had to pay more for worse seating on another airline.

2.0 MediocreAnonymous, May 2026
TYS - IAD
Read more United Airlines reviews

Our flight to Rome, Italy was cancelled the day of and we were never informed. We only found out because I was trying to get into my husbands account and called to get his account number. Had to pay more for worse seating on another airline.

I wish there were outlets to charge my iPhone. The crew was great; we had a female pilot who was great with explaining what was happening and delays,

The staff was hospitable and professional. The seat had a bit of wear. The winner shade was stuck 1/4 open. I received the best of both worlds. The morning sun was able to come in and blind the screen i was trying to use while at the same time it was too low to look out and enjoy the view. Rather embarrassing for a 1st class ticket.

Even though we were delayed, we were able to make our connection

Another delayed flight. When the delays exceed the duration of the flight, it’s a problem.

Trip was great. A wild landing in Ottawa with the wind and rain, but the pilot did a great job. Always love flying United.👍

The internet service I paid for didn’t work at all and the flight crew was not very friendly.

The planes are so dirty! Food crumbs and finger print smudges, Dust over the vents and carpet stains. It’s disgusting.

Overall it was good. The flight was bumpy at times, but the pilot made us aware every time. As a result, no snacks/drinks were made available. Seats were tight but that’s okay as I had a window seat.

Both of the first class flight attendants were rude, to everyone, not just us. The one in coach was more helpful to us than the ones in first class!

Flight delays for communication overall not a good experience uncomfortable on the plane. Person in front of me reclined his seat, putting them inches from my lap.

Air condition was not working for long both after boarding and also after landing ; unbearably hot and suffocating

Not to have gotten delayed by 2+ hours for the fourth straight American flight. They're the worst.

the plane was so hot!! the air-conditioning was barely blowing. The flight was delayed, and we had to sit on the hot plane before take off for an extended amount of time, waiting on international passengers. Would not have been so bad if it was not so hot. They said it would get better after take off, but it did not.

Did not get any refreshments. Crew was very nice but limited. Small seats

Wish a flight with more than 2 hours with some snack rather than just cookie/biscuit.

I didn’t like anything, being platinum pro get you absolutely nowhere and does not increase the customer service treatment whatsoever anymore. My flight was canceled and they put me on a flight eight hours later that would’ve got me back in the middle of the night. They could’ve easily move me up to an hour Prior on an earlier flight. My second flight was unreasonable to take, the third flight was also canceled due to mechanical issues like the first flight. I don’t know what’s going on with American, but they are falling apart, after seven flight changes I finally got home, Unreasonable.

This was a horrible American Airlines experience, and it discourages me from flying with them again. It may have stemmed from a mechanical delay, but it appeared that the team was unprepared to respond to the delay. After boarding, we waited an hour before finally taking off. After landing at our destination, we waited an additional hour on the tarmac waiting for a gate (at 8:00pm) to be assigned and cleared. The flight crew did their best, but they were clearly tired and also ready to be done for the day. Because of the delay, I missed a connecting flight. It was a very poor experience.

Fantastic! If it had not been for a check-in agent in Knoxville I may have not gotten my passes on British Airways. I couldn’t check-in online because British Airways had messed us the info on my tickets to London & Inverness. AA’s was great! British Airways was a continuous series of delays and frustrations.

Wheelchair was waiting for me,changed to a better seat which was great as it's hard for me to walk

Everything you need to know for your flight from Knoxville to Idaho Falls

Information on your arrival and departure airports