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.

Fri, Feb 20 - Sun, Feb 22

DEN

Denver

FSD

Sioux Falls

$88 Roundtrip, just found

$88

Roundtrip

just found

Select Frontier Airlines flight, departing Fri, Feb 20 from Denver to Sioux Falls, returning Sun, Feb 22, priced at $88 just found

Fri, Feb 13 - Sun, Feb 15

DEN

Denver

FSD

Sioux Falls

$98 Roundtrip, just found

$98

Roundtrip

just found

Select Frontier Airlines flight, departing Fri, Feb 13 from Denver to Sioux Falls, returning Sun, Feb 15, priced at $98 just found

Thu, Mar 5 - Mon, Mar 9

DEN

Denver

FSD

Sioux Falls

$108 Roundtrip, found 6 hours ago

$108

Roundtrip

found 6 hours ago

Select Frontier Airlines flight, departing Thu, Mar 5 from Denver to Sioux Falls, returning Mon, Mar 9, priced at $108 found 6 hours ago

Thu, Feb 12 - Sun, Feb 15

DEN

Denver

FSD

Sioux Falls

$118 Roundtrip, found 23 hours ago

$118

Roundtrip

found 23 hours ago

Select Frontier Airlines flight, departing Thu, Feb 12 from Denver to Sioux Falls, returning Sun, Feb 15, priced at $118 found 23 hours ago

Thu, Feb 12 - Fri, Feb 13

DEN

Denver

FSD

Sioux Falls

$128 Roundtrip, found 2 hours ago

$128

Roundtrip

found 2 hours ago

Select Frontier Airlines flight, departing Thu, Feb 12 from Denver to Sioux Falls, returning Fri, Feb 13, priced at $128 found 2 hours ago

Thu, Feb 19 - Mon, Feb 23

DEN

Denver

FSD

Sioux Falls

$133 Roundtrip, found 1 day ago

$133

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Thu, Feb 19 from Denver to Sioux Falls, returning Mon, Feb 23, priced at $133 found 1 day ago

Fri, Feb 13 - Mon, Feb 16

DEN

Denver

FSD

Sioux Falls

$138 Roundtrip, just found

$138

Roundtrip

just found

Select Frontier Airlines flight, departing Fri, Feb 13 from Denver to Sioux Falls, returning Mon, Feb 16, priced at $138 just found

Thu, Feb 12 - Fri, Feb 20

DEN

Denver

FSD

Sioux Falls

$179 Roundtrip, found 3 days ago

$179

Roundtrip

found 3 days ago

Select United flight, departing Thu, Feb 12 from Denver to Sioux Falls, returning Fri, Feb 20, priced at $179 found 3 days ago

Sat, Feb 14 - Wed, Feb 18

ORD

Chicago

FSD

Sioux Falls

$189 Roundtrip, just found

$189

Roundtrip

just found

Select American Airlines flight, departing Sat, Feb 14 from Chicago to Sioux Falls, returning Wed, Feb 18, priced at $189 just found

Thu, Feb 19 - Mon, Feb 23

DEN

Denver

FSD

Sioux Falls

$199 Roundtrip, found 1 day ago

$199

Roundtrip

found 1 day ago

Select Delta flight, departing Thu, Feb 19 from Denver to Sioux Falls, returning Mon, Feb 23, priced at $199 found 1 day ago