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Cheap flights from Knoxville to Idaho Falls from $363

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Knoxville to Idaho Falls departing on 8/16. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Knoxville to Idaho Falls

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
2:51 pm - 8:59 am
TYS
-
IDA
20h 08m
1 stop
Multiple Airlines Logo
5:33 pm - 2:59 pm
IDA
-
TYS
43h 26m
2 stops
$363Multiple Airlines
Sun, Aug 16 - Mon, Aug 24
United Airlines Logo
4:50 pm - 9:18 pm
TYS
-
IDA
6h 28m
1 stop
United Airlines Logo
2:25 pm - 10:29 pm
IDA
-
TYS
6h 04m
1 stop
$405United Airlines
Tue, Aug 18 - Tue, Aug 25
Multiple Airlines Logo
2:51 pm - 8:59 am
TYS
-
IDA
20h 08m
1 stop
Multiple Airlines Logo
6:09 pm - 1:49 pm
IDA
-
TYS
41h 40m
2 stops
$427Multiple Airlines
Sun, Aug 16 - Fri, Aug 28
Multiple Airlines Logo
2:51 pm - 8:59 am
TYS
-
IDA
20h 08m
1 stop
Multiple Airlines Logo
7:54 pm - 9:46 pm
IDA
-
TYS
23h 52m
2 stops
$440Multiple Airlines
Sun, Aug 16 - Sun, Aug 23
Delta Logo
5:40 am - 2:35 pm
TYS
-
IDA
10h 55m
2 stops
Delta Logo
7:00 pm - 9:36 am
IDA
-
TYS
12h 36m
2 stops
$445Delta
Tue, Aug 18 - Thu, Aug 27
United Airlines Logo
9:00 am - 1:29 pm
TYS
-
IDA
6h 29m
1 stop
United Airlines Logo
2:25 pm - 10:29 pm
IDA
-
TYS
6h 04m
1 stop
$449United Airlines
Wed, Aug 19 - Wed, Aug 26
United Airlines Logo
5:45 am - 5:16 pm
TYS
-
IDA
13h 31m
2 stops
United Airlines Logo
2:35 pm - 10:20 pm
IDA
-
TYS
5h 45m
1 stop
$454United Airlines
Sat, Oct 24 - Wed, Oct 28
Multiple Airlines Logo
2:51 pm - 8:59 am
TYS
-
IDA
20h 08m
1 stop
Multiple Airlines Logo
7:54 pm - 9:46 pm
IDA
-
TYS
23h 52m
2 stops
$462Multiple Airlines
Sun, Aug 16 - Thu, Aug 27
Multiple Airlines Logo
2:39 pm - 12:54 pm
TYS
-
IDA
24h 15m
1 stop
Multiple Airlines Logo
5:33 pm - 2:35 pm
IDA
-
TYS
19h 02m
2 stops
$473Multiple Airlines
Thu, Aug 20 - Mon, Aug 24
American Airlines Logo
5:15 am - 1:50 pm
TYS
-
IDA
10h 35m
2 stops
American Airlines Logo
2:20 pm - 11:18 pm
IDA
-
TYS
6h 58m
1 stop
$477American Airlines
Tue, Aug 18 - Tue, Aug 25

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United Airlines flights from Knoxville to Idaho Falls

Our best United Airlines deals on Knoxville to Idaho Falls flight tickets
United Airlines
Aug 18
TYS4:50 pmKnoxville McGhee Tyson
6h 28m
1 stop
IDA9:18 pmIdaho Falls Fanning Field
Aug 25
IDA2:25 pmIdaho Falls Fanning Field
6h 04m
1 stop
TYS10:29 pmKnoxville McGhee Tyson
$405
United Airlines
Aug 19
TYS9:00 amKnoxville McGhee Tyson
6h 29m
1 stop
IDA1:29 pmIdaho Falls Fanning Field
Aug 26
IDA2:25 pmIdaho Falls Fanning Field
6h 04m
1 stop
TYS10:29 pmKnoxville McGhee Tyson
$449
United Airlines
Sep 5
TYS4:50 pmKnoxville McGhee Tyson
6h 28m
1 stop
IDA9:18 pmIdaho Falls Fanning Field
Sep 12
IDA2:25 pmIdaho Falls Fanning Field
6h 19m
1 stop
TYS10:44 pmKnoxville McGhee Tyson
$484

Delta flights from Knoxville to Idaho Falls

Our best Delta deals on Knoxville to Idaho Falls flight tickets
Delta
Aug 18
TYS5:40 amKnoxville McGhee Tyson
10h 55m
2 stops
IDA2:35 pmIdaho Falls Fanning Field
Aug 27
IDA7:00 pmIdaho Falls Fanning Field
12h 36m
2 stops
TYS9:36 amKnoxville McGhee Tyson
$445
Delta
Aug 18
TYS5:40 amKnoxville McGhee Tyson
10h 55m
2 stops
IDA2:35 pmIdaho Falls Fanning Field
Aug 26
IDA7:00 pmIdaho Falls Fanning Field
12h 36m
2 stops
TYS9:36 amKnoxville McGhee Tyson
$481
Delta
Aug 21
TYS7:30 amKnoxville McGhee Tyson
12h 50m
2 stops
IDA6:20 pmIdaho Falls Fanning Field
Aug 27
IDA7:00 pmIdaho Falls Fanning Field
12h 36m
2 stops
TYS9:36 amKnoxville McGhee Tyson
$498

momondo 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, momondo users made 832,500 searches. Data last updated June 12, 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

Price

Cheapest round-trip

KnoxvilleIdaho Falls

TYS - IDA

TYSIDA

Knoxville McGhee Tyson

Sun 8/16

2:51 pm-8:59 am

1 stop20h 08m

Idaho Falls Fanning Field

Mon 8/24

5:33 pm-2:59 pm

2 stops43h 26m

$363
Quickest round-trip

KnoxvilleIdaho Falls

TYS - IDA

TYSIDA

Knoxville McGhee Tyson

Tue 8/18

4:50 pm-9:18 pm

1 stop6h 28m

Idaho Falls Fanning Field

Tue 8/25

2:25 pm-10:29 pm

1 stop6h 04m

$405

KnoxvilleIdaho Falls

TYS - IDA

TYSIDA

Knoxville McGhee Tyson

Sun 8/16

2:51 pm-8:59 am

1 stop20h 08m

Idaho Falls Fanning Field

Fri 8/28

6:09 pm-1:49 pm

2 stops41h 40m

$427

KnoxvilleIdaho Falls

TYS - IDA

TYSIDA

Knoxville McGhee Tyson

Sun 8/16

2:51 pm-8:59 am

1 stop20h 08m

Idaho Falls Fanning Field

Sun 8/23

7:54 pm-9:46 pm

2 stops23h 52m

$440

KnoxvilleIdaho Falls

TYS - IDA

TYSIDA

Knoxville McGhee Tyson

Tue 8/18

5:40 am-2:35 pm

2 stops10h 55m

Idaho Falls Fanning Field

Thu 8/27

7:00 pm-9:36 am

2 stops12h 36m

$445

KnoxvilleIdaho Falls

TYS - IDA

TYSIDA

Knoxville McGhee Tyson

Wed 8/19

9:00 am-1:29 pm

1 stop6h 29m

Idaho Falls Fanning Field

Wed 8/26

2:25 pm-10:29 pm

1 stop6h 04m

$449

KnoxvilleIdaho Falls

TYS - IDA

TYSIDA

Knoxville McGhee Tyson

Sat 10/24

5:45 am-5:16 pm

2 stops13h 31m

Idaho Falls Fanning Field

Wed 10/28

2:35 pm-10:20 pm

1 stop5h 45m

$454

KnoxvilleIdaho Falls

TYS - IDA

TYSIDA

Knoxville McGhee Tyson

Sun 8/16

2:51 pm-8:59 am

1 stop20h 08m

Idaho Falls Fanning Field

Thu 8/27

7:54 pm-9:46 pm

2 stops23h 52m

$462

KnoxvilleIdaho Falls

TYS - IDA

TYSIDA

Knoxville McGhee Tyson

Thu 8/20

2:39 pm-12:54 pm

1 stop24h 15m

Idaho Falls Fanning Field

Mon 8/24

5:33 pm-2:35 pm

2 stops19h 02m

$473

KnoxvilleIdaho Falls

TYS - IDA

TYSIDA

Knoxville McGhee Tyson

Tue 8/18

5:15 am-1:50 pm

2 stops10h 35m

Idaho Falls Fanning Field

Tue 8/25

2:20 pm-11:18 pm

1 stop6h 58m

$477

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 16 resultsSorted by cheapest first
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See travel insights to Idaho Falls from

How to get the cheapest flight ticket from Knoxville to Idaho Falls

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest airline that flies from Knoxville McGhee Tyson to Idaho Falls Fanning Field?

Allegiant Air and Delta are the most popular carriers operating from Knoxville McGhee Tyson to Idaho Falls Fanning Field

What airlines fly to Idaho Falls?

American Airlines, United Airlines and Delta are the top three most popular airlines that fly to Idaho Falls from Knoxville according to our data. American Airlines is the first choice among our users, with 66% of people opting to fly with this airline when traveling to Idaho Falls. Keep in mind that there are 3 different airlines that fly to Idaho Falls on a routine basis, so you have a few additional options to choose from.

When to book flights from Knoxville to Idaho Falls

Are you open to changing your travel dates? Check out the ideal times to fly from Knoxville to Idaho Falls according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Knoxville to Idaho Falls (TYS to IDA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Knoxville to Idaho Falls

Fastest flight time

6h 11m

Direct flights

None
The fastest flight from Knoxville to Idaho Falls takes 6h 11m
There are no direct flights from Knoxville to Idaho Falls. There are no popular flight routes from Knoxville to Idaho Falls.
Search flight deals

Frequently asked questions about flying from Knoxville to Idaho Falls

  • How far is Knoxville McGhee Tyson to Idaho Falls Fanning Field by plane?

    The straight-line distance from Knoxville McGhee Tyson to Idaho Falls Fanning Field is 1571.6 mi. A reasonable flight in good conditions will take 6h 11m.

  • When did momondo last update prices for flights from Knoxville McGhee Tyson Airport to Idaho Falls Fanning Field Airport?

    Prices for flights from Knoxville McGhee Tyson Airport to Idaho Falls Fanning Field Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Knoxville McGhee Tyson Airport to Idaho Falls Fanning Field Airport?

  • How old do you have to be to fly from Knoxville McGhee Tyson Airport to Idaho Falls Fanning Field Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Knoxville McGhee Tyson Airport to Idaho Falls Fanning Field Airport.

  • What documentation or ID do you need to fly to Idaho Falls Fanning Field Airport?

    The required travel and health documents for your Idaho Falls Fanning Field Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Idaho Falls Fanning Field Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular airline from Knoxville to Idaho Falls?

Best airlines flying from Knoxville to Idaho Falls

Compare and see reviews for airlines that fly from Knoxville to Idaho Falls with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $288Free CancellationRating
7.1
11,644 reviews
Search American Airlines flights
United AirlinesPriceFrom $439Free CancellationRating
7.4
9,810 reviews
Search United Airlines flights

Traveling to a place near Idaho Falls?

Book flights to Idaho Falls if you plan to visit one of these locations
Rexburg

Why use momondo?

Why should I use momondo to find a flight deal from Knoxville to Idaho Falls?

Finding the right flight to Idaho Falls from Knoxville is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Idaho Falls quick and easy, saving you time and money.

Can I find flights from Knoxville to Idaho Falls with flexible booking policies on momondo?

Flights from Knoxville to Idaho Falls with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Knoxville to Idaho Falls?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Idaho Falls from Knoxville.

I’m not ready to book a flight from Knoxville to Idaho Falls right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Idaho Falls, momondo offers a useful price alert feature which will track prices for flights to Idaho Falls from Knoxville and alert you when they change.

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