There are
2,751 mi
from Porterville, CA to Greenbelt, MD
That's the driving distance. It would take 2 days to go from Porterville, California to Greenbelt, Maryland.
The flight distance (direct flight from Porterville, CA to Greenbelt, MD) is 2,297.27 mi.
2,751 mi = 4,426.96 kms