Cheap Flights to Knox County from $70

How much is the cheapest flight to Knox County?

Prices were available within the past 7 days and start at $70 for one-way flights and $98 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, Mar 5 - Fri, Mar 13

DEN

Denver

FSD

Sioux Falls

$98 Roundtrip, found 1 day ago

$98

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Thu, Mar 5 from Denver to Sioux Falls, returning Fri, Mar 13, priced at $98 found 1 day ago

Thu, Feb 19 - Thu, Feb 26

DEN

Denver

FSD

Sioux Falls

$108 Roundtrip, found 1 day ago

$108

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Thu, Feb 19 from Denver to Sioux Falls, returning Thu, Feb 26, priced at $108 found 1 day ago

Thu, Feb 19 - Sun, Feb 22

DEN

Denver

FSD

Sioux Falls

$113 Roundtrip, found 1 day ago

$113

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Thu, Feb 19 from Denver to Sioux Falls, returning Sun, Feb 22, priced at $113 found 1 day ago

Mon, Mar 9 - Mon, Mar 16

DEN

Denver

FSD

Sioux Falls

$114 Roundtrip, found 3 days ago

$114

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Mon, Mar 9 from Denver to Sioux Falls, returning Mon, Mar 16, priced at $114 found 3 days ago

Sun, Feb 15 - Thu, Feb 19

DEN

Denver

FSD

Sioux Falls

$123 Roundtrip, found 1 day ago

$123

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Sun, Feb 15 from Denver to Sioux Falls, returning Thu, Feb 19, priced at $123 found 1 day ago

Thu, Mar 5 - Mon, Mar 9

DEN

Denver

FSD

Sioux Falls

$124 Roundtrip, found 14 hours ago

$124

Roundtrip

found 14 hours ago

Select Frontier Airlines flight, departing Thu, Mar 5 from Denver to Sioux Falls, returning Mon, Mar 9, priced at $124 found 14 hours ago

Sun, Mar 1 - Thu, Mar 5

ORD

Chicago

FSD

Sioux Falls

$167 Roundtrip, found 1 hour ago

$167

Roundtrip

found 1 hour ago

Select Delta flight, departing Sun, Mar 1 from Chicago to Sioux Falls, returning Thu, Mar 5, priced at $167 found 1 hour ago

Thu, Mar 5 - Mon, Mar 9

DEN

Denver

FSD

Sioux Falls

$184 Roundtrip, found 22 hours ago

$184

Roundtrip

found 22 hours ago

Select United flight, departing Thu, Mar 5 from Denver to Sioux Falls, returning Mon, Mar 9, priced at $184 found 22 hours ago

Sat, Apr 4 - Tue, Apr 21

ORD

Chicago

FSD

Sioux Falls

$189 Roundtrip, found 6 hours ago

$189

Roundtrip

found 6 hours ago

Select American Airlines flight, departing Sat, Apr 4 from Chicago to Sioux Falls, returning Tue, Apr 21, priced at $189 found 6 hours ago

Wed, Mar 4 - Tue, Mar 10

SEA

Seattle

FSD

Sioux Falls

$369 Roundtrip, found 5 hours ago

$369

Roundtrip

found 5 hours ago

Select Alaska Airlines flight, departing Wed, Mar 4 from Seattle to Sioux Falls, returning Tue, Mar 10, priced at $369 found 5 hours ago