There are
2,821 mi
from Redwood City, CA to Rockville, MD
That's the driving distance. It would take 2 days 1 hour to go from Redwood City, California to Rockville, Maryland.
The flight distance (direct flight from Redwood City, CA to Rockville, MD) is 2,422.26 mi.
2,821 mi = 4,540.38 kms