TYS - IDA

$351 Find Cheap Flights from Knoxville to Idaho Falls

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 5/16. 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

KAYAK searches hundreds of travel sites at once for deals on flights to Idaho Falls

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Knoxville to Idaho Falls, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Knoxville to Idaho Falls, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$473
United Airlines
Wed 4/29Sat 5/2
TYS - IDA • 1 stop
Cheapest one-way
$351
United Airlines
Sat 5/16
TYS - IDA • 1 stop
Top airlines
United Airlines
Cheapest • from $473 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
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We hope you love your trip to Idaho Falls!
Flight Deals
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

Wed, Apr 29 - Sat, May 2
United Airlines Logo
4:30 pm - 9:55 am
TYS
-
IDA
19h 25m
1 stop
United Airlines Logo
2:31 pm - 10:23 pm
IDA
-
TYS
5h 52m
1 stop
$473United Airlines
Wed, Apr 29 - Sat, May 2
United Airlines Logo
10:49 am - 9:55 am
TYS
-
IDA
25h 06m
2 stops
United Airlines Logo
2:31 pm - 10:23 pm
IDA
-
TYS
5h 52m
1 stop
$478United Airlines
Wed, Apr 29 - Sat, May 2
United Airlines Logo
5:15 pm - 9:55 am
TYS
-
IDA
18h 40m
2 stops
United Airlines Logo
2:31 pm - 10:49 am
IDA
-
TYS
18h 18m
2 stops
$526United Airlines
Wed, Apr 29 - Sat, May 2
United Airlines Logo
7:00 am - 9:55 am
TYS
-
IDA
28h 55m
2 stops
United Airlines Logo
10:40 am - 11:44 pm
IDA
-
TYS
11h 04m
2 stops
$553United Airlines
Wed, Apr 29 - Sat, May 2
United Airlines Logo
9:40 am - 9:55 am
TYS
-
IDA
26h 15m
2 stops
United Airlines Logo
2:31 pm - 10:49 am
IDA
-
TYS
18h 18m
2 stops
$556United Airlines
Wed, Apr 1 - Wed, Apr 8
American Airlines Logo
12:21 pm - 11:24 pm
TYS
-
IDA
13h 03m
2 stops
American Airlines Logo
1:43 pm - 11:56 pm
IDA
-
TYS
8h 13m
1 stop
$565American Airlines
Wed, Apr 1 - Wed, Apr 8
American Airlines Logo
12:21 pm - 11:24 pm
TYS
-
IDA
13h 03m
2 stops
American Airlines Logo
7:48 am - 11:56 pm
IDA
-
TYS
14h 08m
2 stops
$570American Airlines
Wed, Apr 1 - Wed, Apr 8
American Airlines Logo
5:40 am - 1:48 pm
TYS
-
IDA
10h 08m
1 stop
American Airlines Logo
1:43 pm - 11:56 pm
IDA
-
TYS
8h 13m
1 stop
$575American Airlines
Wed, Apr 1 - Wed, Apr 8
United Airlines Logo
4:30 pm - 9:02 pm
TYS
-
IDA
6h 32m
1 stop
United Airlines Logo
5:20 pm - 10:08 am
IDA
-
TYS
14h 48m
2 stops
$588United Airlines
Wed, Apr 1 - Wed, Apr 8
United Airlines Logo
4:30 pm - 9:02 pm
TYS
-
IDA
6h 32m
1 stop
United Airlines Logo
6:45 am - 3:06 pm
IDA
-
TYS
6h 21m
1 stop
$615United 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 72 hours.

In the past 3 days, the cheapest round-trip tickets from Knoxville to Idaho Falls were found on United Airlines ($473) and American Airlines ($565).

Good to know

Low seasonOctober
Cheapest flight$351
Best time to beat the crowds with an average 26% drop in price.
Most popular time to fly and prices are also 10% lower on average.
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 3 days, the lowest price for a flight from Knoxville to Idaho Falls was $351 for a one-way ticket and $473 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 $579 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 $567 and an overall rating of 7.2.

  • 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 9253 reviews
7.7Boarding
8.1Crew
6.6Food
7.1Entertainment
7.3Comfort
Airline reviews

I upgraded my seat and was promised it would be next to the emergency door for extra leg room and they said it was premium plus but it was at the back of the plane...same thing happened from Newark to Dubai

6.0 GoodPiers, Feb 2026
PHX - EWR
Read more United Airlines reviews

I upgraded my seat and was promised it would be next to the emergency door for extra leg room and they said it was premium plus but it was at the back of the plane...same thing happened from Newark to Dubai

Everything except the food and entertainment. It was a great experience though

Bad food, bad service, cold cabin with no additional blankets when asked for (they told me they don’t provide additional blankets). I’m a frequent traveler and this is one of the worst companies I traveled with (by the way I thought that I booked my ticket with Lufthansa but I didn’t see that the flights were handled by United).

United Airlines is my preferred airlines and I am thankful for Gary who also help support me on the phone to switch my flight literally last min.

Not being stranded in Chicago for her airport to 11:30 tomorrow morning the 3rd

the whole trip was smooth, and as comfortable as flying is these days. flight crew was friendly and very courteous and helpful.

The attendant on board was amazing. She should be doing business/first international long haul.

I was fully checked in the prior night and i was unchecked and then didn’t have a seat when I boarded. Instead of an aisle seat, I was out in the middle seat of the very last row of the plane.

In overall it was a good experience, the only down point was that the entertainment screen was working properly.

HORRIBLE, my initial flight was cancelled, they made me pay $200 extra dollars and that got cancelled as well! After 6 cancellations I decided to get a refund because I needed to get home to my babies. Out of $1000+ dollars they offered me only $40 in refund! Totally unacceptable! The flight that they cancelled I was able to fly it on another airline. I had to spend $400 on one way tickets just to get home! I’m still getting the runaround.

Flight was delayed for 2 hours, then last minute the change to on time. The satélite location is far and a nightmare to get to.

This was a horrible experience. I’ve experienced several delays at this point and still not home. I was supposed to be home by 8:30 last night and here I sit at 7 am on a plane STILL unable to go home because of American Airlines.

Generally good. Flight left on time and the seats are comfortable. Plenty of space in front if you in you choose a comfort plus seat, completely worth spending the extra money given the amount of hours the flight lasts. The food tastes good but I would say it’s a the amount is too little. The crew was friendly and efficient. There was a some turbulence at different points into the flight. American Airlines has good deals to NZ if you book with plenty of time before you plan on going.

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.

They are always late and seats was also not having working charger

We flew in first class. The crew did not offer drinks before the flight took off, but they treated us well during the flight. The food was excellent. There was actually too much food served, but it was nice to have all the options.

did not have enough meal for first class passengers so offer us snack

Arrived 40 min early which was great - sat in runway for 35 min so no gain. Then waited for luggage 45 min. They need to staff accordingly knowing its one of the busiest week in Phx

My flight got rerouted due to crew rest. I was sent to Dallas customer service was not very polite. Was given a $40 room voucher for Motel 6 and $12 to eat with. It delayed me by a day. Where if I would have just stuck with my original flight Arizona was delayed to Cleveland and I could have made it home. They put me on a 9:00 flight out of Dallas to Cleveland without my knowledge or consent. When originally I was told it would be 8:45 a.m. on February 1st. I told them I could not take the 9:00 flight because I did not have anybody to pick me up from the airport at that time. I'm extremely disappointed in how I was treated. And I will not fly American Airlines again.

I am very appreciative of the help provided to me by Dennis and Whitney. I had lost my phone at EWR airport and they were very kind in assisting me. This included advice on how to file a report and also helping me connect with family. The pilot was also great about keeping passengers updated on the flight progress with regular communications over the system.

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

Information on your arrival and departure airports