There are
801 mi
from San Leandro, CA to Seatac, WA
That's the driving distance. It would take 15 hours 27 mins to go from San Leandro, California to Seatac, Washington.
The flight distance (direct flight from San Leandro, CA to Seatac, WA) is 672.25 mi.
801 mi = 1,289.08 kms