There are
2,841 mi
from Redwood City, CA to Greenbelt, MD
That's the driving distance. It would take 2 days 2 hours to go from Redwood City, California to Greenbelt, Maryland.
The flight distance (direct flight from Redwood City, CA to Greenbelt, MD) is 2,437.96 mi.
2,841 mi = 4,571.36 kms