There are
814 mi
from Fremont, CA to Seatac, WA
That's the driving distance. It would take 15 hours 44 mins to go from Fremont, California to Seatac, Washington.
The flight distance (direct flight from Fremont, CA to Seatac, WA) is 684.61 mi.
814 mi = 1,310.49 kms