There are
2,980 mi
from Boynton Beach, FL to Foster City, CA
That's the driving distance. It would take 2 days 5 hours to go from Boynton Beach, Florida to Foster City, California.
The flight distance (direct flight from Boynton Beach, FL to Foster City, CA) is 2,563.03 mi.
2,980 mi = 3.22 kms