There are
2,753 mi
from Gaithersburg, MD to Arroyo Grande, CA
That's the driving distance. It would take 2 days 1 hour to go from Gaithersburg, Maryland to Arroyo Grande, California.
The flight distance (direct flight from Gaithersburg, MD to Arroyo Grande, CA) is 2,383.51 mi.
2,753 mi = 4,431.12 kms