There are
2,907 mi
from Gaithersburg, MD to Arcata, CA
That's the driving distance. It would take 2 days 3 hours to go from Gaithersburg, Maryland to Arcata, California.
The flight distance (direct flight from Gaithersburg, MD to Arcata, CA) is 2,454.14 mi.
2,907 mi = 4,678.67 kms