Both of these airports are about equal in distance:
Napa County Airport is about 2 miles south of Napa Valley.
Oakland, San Francisco and Sacramento airports are all equidistant from Napa, but the easiest airport to get into / out of by far is Sacramento.
Sonoma County Airport in Santa Rosa Closest major airport is Oakland.
san fransisco
Dillion or Stinson
an hour and a half
Sonoma to the west and Santa Barbara to the south
Ace Rental Car has one location in Northern California. That's at the San Francisco Airport. It's approximately 61 miles from Napa, Ca. The drive will take around an hour. Since there aren't any other nearby locations you'd have to return the vehicle there or in Southern California. The closest Ace Rent a Car location that would serve Napa Valley would be the service location in San Francisco at San Francisco International Airport. In road miles this is approximately 56 miles from Napa Valley. Visitors should plan on this being about an hour of driving time to get from the airport to hotels and wineries in Napa Valley itself..
The closest major airport to Maggie Valley, North Carolina is Asheville Regional Airport (AVL / KAVL). This airport is in Asheville, North Carolina and is about 42 miles by car from the center of Maggie Valley.
About 65.4 miles or 1.25 hour drive
The nearest major airport is Burbank Airport (BUR). The closest international airport is LAX, and the closest general aviation (small planes) is Van Nuys (VNY)
About 55 miles on the I-580/80 E.