There are
2,991 mi
from Deerfield Beach, FL to Foster City, CA
That's the driving distance. It would take 2 days 5 hours to go from Deerfield Beach, Florida to Foster City, California.
The flight distance (direct flight from Deerfield Beach, FL to Foster City, CA) is 2,567.95 mi.
2,991 mi = 4,813.26 kms