Cheap Flights to Knox County from $47

How much is the cheapest flight to Knox County?

Prices were available within the past 7 days and start at $47 for one-way flights and $94 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Feb 27 - Mon, Mar 2

DEN

Denver

FSD

Sioux Falls

$94 Roundtrip, found 2 hours ago

$94

Roundtrip

found 2 hours ago

Select Frontier Airlines flight, departing Fri, Feb 27 from Denver to Sioux Falls, returning Mon, Mar 2, priced at $94 found 2 hours ago

Fri, Feb 20 - Fri, Feb 27

DEN

Denver

FSD

Sioux Falls

$104 Roundtrip, just found

$104

Roundtrip

just found

Select Frontier Airlines flight, departing Fri, Feb 20 from Denver to Sioux Falls, returning Fri, Feb 27, priced at $104 just found

Fri, Apr 10 - Mon, Apr 13

DEN

Denver

FSD

Sioux Falls

$112 Roundtrip, found 1 day ago

$112

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Fri, Apr 10 from Denver to Sioux Falls, returning Mon, Apr 13, priced at $112 found 1 day ago

Fri, Feb 20 - Sun, Feb 22

PHX

Phoenix

FSD

Sioux Falls

$128 Roundtrip, found 1 day ago

$128

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Fri, Feb 20 from Phoenix to Sioux Falls, returning Sun, Feb 22, priced at $128 found 1 day ago

Mon, Dec 29 - Mon, Jan 5

DEN

Denver

FSD

Sioux Falls

$137 Roundtrip, found 3 hours ago

$137

Roundtrip

found 3 hours ago

Select Frontier Airlines flight, departing Mon, Dec 29 from Denver to Sioux Falls, returning Mon, Jan 5, priced at $137 found 3 hours ago

Fri, Feb 20 - Sun, Mar 1

PHX

Phoenix

FSD

Sioux Falls

$138 Roundtrip, found 1 day ago

$138

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Fri, Feb 20 from Phoenix to Sioux Falls, returning Sun, Mar 1, priced at $138 found 1 day ago

Thu, Jan 8 - Sun, Jan 11

ORD

Chicago

FSD

Sioux Falls

$189 Roundtrip, found 4 hours ago

$189

Roundtrip

found 4 hours ago

Select American Airlines flight, departing Thu, Jan 8 from Chicago to Sioux Falls, returning Sun, Jan 11, priced at $189 found 4 hours ago

Fri, Feb 27 - Mon, Mar 2

DEN

Denver

FSD

Sioux Falls

$189 Roundtrip, found 2 hours ago

$189

Roundtrip

found 2 hours ago

Select United flight, departing Fri, Feb 27 from Denver to Sioux Falls, returning Mon, Mar 2, priced at $189 found 2 hours ago

Wed, Jan 14 - Sat, Jan 17

PHX

Phoenix

FSD

Sioux Falls

$197 Roundtrip, found 6 days ago

$197

Roundtrip

found 6 days ago

Select Delta flight, departing Wed, Jan 14 from Phoenix to Sioux Falls, returning Sat, Jan 17, priced at $197 found 6 days ago

Wed, Feb 4 - Tue, Feb 10

BOI

Boise

FSD

Sioux Falls

$339 Roundtrip, found 1 day ago

$339

Roundtrip

found 1 day ago

Select Alaska Airlines flight, departing Wed, Feb 4 from Boise to Sioux Falls, returning Tue, Feb 10, priced at $339 found 1 day ago