There are
180 mi
from Hillsboro, OR to Seatac, WA
That's the driving distance. It would take 3 hours 42 mins to go from Hillsboro, Oregon to Seatac, Washington.
The flight distance (direct flight from Hillsboro, OR to Seatac, WA) is 137.14 mi.
180 mi = 289.26 kms