There are
2,886 mi
from Gaithersburg, MD to Seaside, CA
That's the driving distance. It would take 2 days 2 hours to go from Gaithersburg, Maryland to Seaside, California.
The flight distance (direct flight from Gaithersburg, MD to Seaside, CA) is 2,414.88 mi.
2,886 mi = 4,644.94 kms