There are
844 mi
from Redwood City, CA to Sammamish, WA
That's the driving distance. It would take 16 hours 23 mins to go from Redwood City, California to Sammamish, Washington.
The flight distance (direct flight from Redwood City, CA to Sammamish, WA) is 701.80 mi.
844 mi = 1,357.49 kms