There are
2,912 mi
from Rockville, MD to Arcata, CA
That's the driving distance. It would take 2 days 3 hours to go from Rockville, Maryland to Arcata, California.
The flight distance (direct flight from Rockville, MD to Arcata, CA) is 2,457.89 mi.
2,912 mi = 4,686.56 kms