There are
238 mi
from The Dalles, OR to Seatac, WA
That's the driving distance. It would take 4 hours 40 mins to go from The Dalles, Oregon to Seatac, Washington.
The flight distance (direct flight from The Dalles, OR to Seatac, WA) is 139.47 mi.
238 mi = 383.22 kms