When flying from Kaua'i to Redding, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
If you book a flight to Redding from Kaua'i, you will be flying to Redding, which is the city’s only airport. Redding (RDD) is located 7.4 mi from the center of Redding.
This is defined as Lihue Airport (LIH) and Redding Airport (RDD). Codes like Redding Airport are often used to just call airports uniquely.