There are
2,683 mi
from Gaithersburg, MD to Porterville, CA
That's the driving distance. It would take 2 days to go from Gaithersburg, Maryland to Porterville, California.
The flight distance (direct flight from Gaithersburg, MD to Porterville, CA) is 2,278.59 mi.
2,683 mi = 4,317.39 kms