Please book your housing sooner rather than later if you tentatively plan to attend. Housing in this area is somewhat limited and books up quickly. Many hotels and VRBOs in the area have excellent cancellation policies.
Air Travel:
Asheville Regional (AVL)*** - 1.5-2 hours drive
Hartsfield-Jackson Atlanta International (ATL) - 2-3 hours drive
Greenville-Spartanburg International (GSP) - 2 hours drive
Charlotte Douglas International (CLT) - 3-3.5 hours drive
***If you are considering between Atlanta and Asheville, Atlanta may be easier. There are more rental cars, and most likely to get to Asheville you would need to connect through Atlanta anyways. The drive time is comparable when considering layover time.