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Cheap flights from Knoxville to Idaho Falls from $328

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Knoxville to Idaho Falls departing on 5/16. 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
0 bags

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Find the cheapest flights from Knoxville to Idaho Falls

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
4:20 pm - 9:03 pm
TYS
-
IDA
6h 43m
1 stop
United Airlines Logo
2:31 pm - 10:23 pm
IDA
-
TYS
5h 52m
1 stop
$419United Airlines
Tue, May 5 - Sat, May 9
United Airlines Logo
4:20 pm - 9:03 pm
TYS
-
IDA
6h 43m
1 stop
United Airlines Logo
10:40 am - 11:44 pm
IDA
-
TYS
11h 04m
2 stops
$424United Airlines
Tue, May 5 - Sat, May 9
American Airlines Logo
4:09 pm - 11:39 pm
TYS
-
IDA
9h 30m
2 stops
American Airlines Logo
7:48 am - 10:25 pm
IDA
-
TYS
12h 37m
2 stops
$429American Airlines
Tue, May 5 - Sat, May 9
United Airlines Logo
4:56 pm - 9:03 pm
TYS
-
IDA
6h 07m
1 stop
United Airlines Logo
2:30 pm - 10:38 pm
IDA
-
TYS
6h 08m
1 stop
$501United Airlines
Fri, Aug 14 - Mon, Aug 24
American Airlines Logo
6:00 am - 11:30 am
TYS
-
IDA
7h 30m
1 stop
American Airlines Logo
2:20 pm - 11:18 pm
IDA
-
TYS
6h 58m
1 stop
$505American Airlines
Sat, Aug 8 - Sat, Aug 15
American Airlines Logo
7:07 am - 1:40 pm
TYS
-
IDA
8h 33m
1 stop
American Airlines Logo
1:54 pm - 11:52 pm
IDA
-
TYS
7h 58m
1 stop
$525American Airlines
Wed, Jul 1 - Wed, Jul 8
American Airlines Logo
5:00 am - 1:40 pm
TYS
-
IDA
10h 40m
2 stops
American Airlines Logo
1:54 pm - 11:52 pm
IDA
-
TYS
7h 58m
1 stop
$530American Airlines
Wed, Jul 1 - Wed, Jul 8
American Airlines Logo
6:39 pm - 1:40 pm
TYS
-
IDA
21h 01m
1 stop
American Airlines Logo
1:54 pm - 11:52 pm
IDA
-
TYS
7h 58m
1 stop
$534American Airlines
Tue, Jun 30 - Wed, Jul 8
American Airlines Logo
5:36 am - 12:14 pm
TYS
-
IDA
8h 38m
1 stop
American Airlines Logo
12:44 pm - 9:58 pm
IDA
-
TYS
7h 14m
1 stop
$535American Airlines
Fri, May 29 - Fri, Jun 5
United Airlines Logo
8:48 am - 1:24 pm
TYS
-
IDA
6h 36m
1 stop
United Airlines Logo
2:30 pm - 10:38 pm
IDA
-
TYS
6h 08m
1 stop
$545United Airlines
Fri, Aug 14 - Mon, Aug 24

United Airlines flights from Knoxville to Idaho Falls

Our best United Airlines deals on Knoxville to Idaho Falls flight tickets
United Airlines
May 5
TYS4:20 pmKnoxville McGhee Tyson
6h 43m
1 stop
IDA9:03 pmIdaho Falls Fanning Field
May 9
IDA2:31 pmIdaho Falls Fanning Field
5h 52m
1 stop
TYS10:23 pmKnoxville McGhee Tyson
$419
United Airlines
May 5
TYS4:20 pmKnoxville McGhee Tyson
6h 43m
1 stop
IDA9:03 pmIdaho Falls Fanning Field
May 9
IDA10:40 amIdaho Falls Fanning Field
11h 04m
2 stops
TYS11:44 pmKnoxville McGhee Tyson
$424
United Airlines
Aug 14
TYS4:56 pmKnoxville McGhee Tyson
6h 07m
1 stop
IDA9:03 pmIdaho Falls Fanning Field
Aug 24
IDA2:30 pmIdaho Falls Fanning Field
6h 08m
1 stop
TYS10:38 pmKnoxville McGhee Tyson
$501

American Airlines flights from Knoxville to Idaho Falls

Our best American Airlines deals on Knoxville to Idaho Falls flight tickets
American Airlines
May 5
TYS4:09 pmKnoxville McGhee Tyson
9h 30m
2 stops
IDA11:39 pmIdaho Falls Fanning Field
May 9
IDA7:48 amIdaho Falls Fanning Field
12h 37m
2 stops
TYS10:25 pmKnoxville McGhee Tyson
$429
American Airlines
Aug 8
TYS6:00 amKnoxville McGhee Tyson
7h 30m
1 stop
IDA11:30 amIdaho Falls Fanning Field
Aug 15
IDA2:20 pmIdaho Falls Fanning Field
6h 58m
1 stop
TYS11:18 pmKnoxville McGhee Tyson
$505
American Airlines
Jul 1
TYS7:07 amKnoxville McGhee Tyson
8h 33m
1 stop
IDA1:40 pmIdaho Falls Fanning Field
Jul 8
IDA1:54 pmIdaho Falls Fanning Field
7h 58m
1 stop
TYS11:52 pmKnoxville McGhee Tyson
$525

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 April 21, 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

Tue 5/5

4:20 pm-9:03 pm

1 stop6h 43m

Idaho Falls Fanning Field

Sat 5/9

2:31 pm-10:23 pm

1 stop5h 52m

$419

KnoxvilleIdaho Falls

TYS - IDA

TYSIDA

Knoxville McGhee Tyson

Tue 5/5

4:20 pm-9:03 pm

1 stop6h 43m

Idaho Falls Fanning Field

Sat 5/9

10:40 am-11:44 pm

2 stops11h 04m

$424

KnoxvilleIdaho Falls

TYS - IDA

TYSIDA

Knoxville McGhee Tyson

Tue 5/5

4:09 pm-11:39 pm

2 stops9h 30m

Idaho Falls Fanning Field

Sat 5/9

7:48 am-10:25 pm

2 stops12h 37m

$429
Quickest round-trip

KnoxvilleIdaho Falls

TYS - IDA

TYSIDA

Knoxville McGhee Tyson

Fri 8/14

4:56 pm-9:03 pm

1 stop6h 07m

Idaho Falls Fanning Field

Mon 8/24

2:30 pm-10:38 pm

1 stop6h 08m

$501

KnoxvilleIdaho Falls

TYS - IDA

TYSIDA

Knoxville McGhee Tyson

Sat 8/8

6:00 am-11:30 am

1 stop7h 30m

Idaho Falls Fanning Field

Sat 8/15

2:20 pm-11:18 pm

1 stop6h 58m

$505

KnoxvilleIdaho Falls

TYS - IDA

TYSIDA

Knoxville McGhee Tyson

Wed 7/1

7:07 am-1:40 pm

1 stop8h 33m

Idaho Falls Fanning Field

Wed 7/8

1:54 pm-11:52 pm

1 stop7h 58m

$525

KnoxvilleIdaho Falls

TYS - IDA

TYSIDA

Knoxville McGhee Tyson

Wed 7/1

5:00 am-1:40 pm

2 stops10h 40m

Idaho Falls Fanning Field

Wed 7/8

1:54 pm-11:52 pm

1 stop7h 58m

$530

KnoxvilleIdaho Falls

TYS - IDA

TYSIDA

Knoxville McGhee Tyson

Tue 6/30

6:39 pm-1:40 pm

1 stop21h 01m

Idaho Falls Fanning Field

Wed 7/8

1:54 pm-11:52 pm

1 stop7h 58m

$534

KnoxvilleIdaho Falls

TYS - IDA

TYSIDA

Knoxville McGhee Tyson

Fri 5/29

5:36 am-12:14 pm

1 stop8h 38m

Idaho Falls Fanning Field

Fri 6/5

12:44 pm-9:58 pm

1 stop7h 14m

$535

KnoxvilleIdaho Falls

TYS - IDA

TYSIDA

Knoxville McGhee Tyson

Fri 8/14

8:48 am-1:24 pm

1 stop6h 36m

Idaho Falls Fanning Field

Mon 8/24

2:30 pm-10:38 pm

1 stop6h 08m

$545

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 17 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 typical price of a round-trip flight between Knoxville and Idaho Falls?

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 07m

Direct flights

None
The fastest flight from Knoxville to Idaho Falls takes 6h 07m
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 07m.

  • 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
11,645 reviews
Search American Airlines flights
United AirlinesPriceFrom $384Free CancellationRating
7.4
9,613 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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