There are
287 mi
from Gaithersburg, MD to Knightdale, NC
That's the driving distance. It would take 5 hours 25 mins to go from Gaithersburg, Maryland to Knightdale, North Carolina.
The flight distance (direct flight from Gaithersburg, MD to Knightdale, NC) is 242.23 mi.
287 mi = 461.74 kms