Cheap Flights to Knox County from $44

How much is the cheapest flight to Knox County?

Prices were available within the past 7 days and start at $44 for one-way flights and $88 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, Mar 5 - Mon, Mar 9

DEN

Denver

FSD

Sioux Falls

$88 Roundtrip, just found

$88

Roundtrip

just found

Select Frontier Airlines flight, departing Thu, Mar 5 from Denver to Sioux Falls, returning Mon, Mar 9, priced at $88 just found

Fri, Mar 6 - Mon, Mar 9

DEN

Denver

FSD

Sioux Falls

$98 Roundtrip, found 3 days ago

$98

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Fri, Mar 6 from Denver to Sioux Falls, returning Mon, Mar 9, priced at $98 found 3 days ago

Thu, Feb 26 - Thu, Mar 5

DEN

Denver

FSD

Sioux Falls

$109 Roundtrip, found 5 days ago

$109

Roundtrip

found 5 days ago

Select Frontier Airlines flight, departing Thu, Feb 26 from Denver to Sioux Falls, returning Thu, Mar 5, priced at $109 found 5 days ago

Mon, Mar 16 - Mon, Mar 23

DEN

Denver

FSD

Sioux Falls

$118 Roundtrip, found 1 hour ago

$118

Roundtrip

found 1 hour ago

Select Frontier Airlines flight, departing Mon, Mar 16 from Denver to Sioux Falls, returning Mon, Mar 23, priced at $118 found 1 hour ago

Sun, Mar 1 - Thu, Mar 5

DEN

Denver

FSD

Sioux Falls

$124 Roundtrip, just found

$124

Roundtrip

just found

Select Frontier Airlines flight, departing Sun, Mar 1 from Denver to Sioux Falls, returning Thu, Mar 5, priced at $124 just found

Thu, Feb 19 - Mon, Feb 23

DFW

Dallas

FSD

Sioux Falls

$154 Roundtrip, just found

$154

Roundtrip

just found

Select Frontier Airlines flight, departing Thu, Feb 19 from Dallas to Sioux Falls, returning Mon, Feb 23, priced at $154 just found

Thu, Mar 5 - Mon, Mar 9

DEN

Denver

FSD

Sioux Falls

$179 Roundtrip, just found

$179

Roundtrip

just found

Select United flight, departing Thu, Mar 5 from Denver to Sioux Falls, returning Mon, Mar 9, priced at $179 just found

Sat, May 2 - Tue, May 5

ORD

Chicago

FSD

Sioux Falls

$189 Roundtrip, found 1 hour ago

$189

Roundtrip

found 1 hour ago

Select American Airlines flight, departing Sat, May 2 from Chicago to Sioux Falls, returning Tue, May 5, priced at $189 found 1 hour ago

Sat, Sep 19 - Sun, Sep 20

MDW

Chicago

FSD

Sioux Falls

$209 Roundtrip, found 1 hour ago

$209

Roundtrip

found 1 hour ago

Select Delta flight, departing Sat, Sep 19 from Chicago to Sioux Falls, returning Sun, Sep 20, priced at $209 found 1 hour ago

Tue, Apr 28 - Mon, May 4

SEA

Seattle

FSD

Sioux Falls

$369 Roundtrip, just found

$369

Roundtrip

just found

Select Alaska Airlines flight, departing Tue, Apr 28 from Seattle to Sioux Falls, returning Mon, May 4, priced at $369 just found