Cheap Flights to Knox County from $85

How much is the cheapest flight to Knox County?

Prices were available within the past 7 days and start at $85 for one-way flights and $160 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, May 4 - Mon, May 11

SAN

San Diego

FSD

Sioux Falls

$160 Roundtrip, found 13 hours ago

$160

Roundtrip

found 13 hours ago

Select Frontier Airlines flight, departing Mon, May 4 from San Diego to Sioux Falls, returning Mon, May 11, priced at $160 found 13 hours ago

Thu, May 7 - Wed, May 13

PHX

Phoenix

FSD

Sioux Falls

$160 Roundtrip, found 1 day ago

$160

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Thu, May 7 from Phoenix to Sioux Falls, returning Wed, May 13, priced at $160 found 1 day ago

Fri, May 8 - Mon, May 11

PHX

Phoenix

FSD

Sioux Falls

$172 Roundtrip, found 2 days ago

$172

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Fri, May 8 from Phoenix to Sioux Falls, returning Mon, May 11, priced at $172 found 2 days ago

Wed, May 6 - Mon, May 11

LAX

Los Angeles

FSD

Sioux Falls

$177 Roundtrip, found 1 day ago

$177

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Wed, May 6 from Los Angeles to Sioux Falls, returning Mon, May 11, priced at $177 found 1 day ago

Wed, May 6 - Sat, May 9

DEN

Denver

FSD

Sioux Falls

$177 Roundtrip, found 15 hours ago

$177

Roundtrip

found 15 hours ago

Select Delta flight, departing Wed, May 6 from Denver to Sioux Falls, returning Sat, May 9, priced at $177 found 15 hours ago

Fri, May 1 - Mon, May 4

PHX

Phoenix

FSD

Sioux Falls

$180 Roundtrip, found 12 hours ago

$180

Roundtrip

found 12 hours ago

Select Frontier Airlines flight, departing Fri, May 1 from Phoenix to Sioux Falls, returning Mon, May 4, priced at $180 found 12 hours ago

Wed, May 6 - Sat, May 9

DEN

Denver

FSD

Sioux Falls

$183 Roundtrip, found 15 hours ago

$183

Roundtrip

found 15 hours ago

Select Frontier Airlines flight, departing Wed, May 6 from Denver to Sioux Falls, returning Sat, May 9, priced at $183 found 15 hours ago

Sat, Jun 13 - Tue, Jun 16

ORD

Chicago

SUX

Sioux City

$204 Roundtrip, found 1 day ago

$204

Roundtrip

found 1 day ago

Select United flight, departing Sat, Jun 13 from Chicago to Sioux City, returning Tue, Jun 16, priced at $204 found 1 day ago

Wed, May 27 - Tue, Jun 2

ORD

Chicago

FSD

Sioux Falls

$249 Roundtrip, found 2 hours ago

$249

Roundtrip

found 2 hours ago

Select American Airlines flight, departing Wed, May 27 from Chicago to Sioux Falls, returning Tue, Jun 2, priced at $249 found 2 hours ago

Sat, May 23 - Sat, May 30

SAN

San Diego

FSD

Sioux Falls

$401 Roundtrip, found 3 days ago

$401

Roundtrip

found 3 days ago

Select Alaska Airlines flight, departing Sat, May 23 from San Diego to Sioux Falls, returning Sat, May 30, priced at $401 found 3 days ago