To save up to 33% on this flight, we recommend booking at least 21 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Sioux City to Knoxville from $269 1-2 weeks out and tickets from $347 for flights departing within the next 72 hours.
The best pricing can be found in the month of August. Prices to Knoxville from Sioux City average $293. You can even find prices in August for less than $293, as users have found deals to Knoxville from as low as $92. The month of February appears to be one of the more expensive times to travel to Knoxville from Sioux City. Flying in the targeted month can save you up to 30%.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Sioux City to Knoxville as you normally would.