There are
2,600 mi
from Oceanside, CA to Hagerstown, MD
That's the driving distance. It would take 1 day 22 hours to go from Oceanside, California to Hagerstown, Maryland.
The flight distance (direct flight from Oceanside, CA to Hagerstown, MD) is 2,230.85 mi.
2,600 mi = 3.22 kms