There are
648 mi
from Hayward, CA to Milwaukie, OR
That's the driving distance. It would take 12 hours 26 mins to go from Hayward, California to Milwaukie, Oregon.
The flight distance (direct flight from Hayward, CA to Milwaukie, OR) is 538.14 mi.
648 mi = 1,042.56 kms