There are
2,802 mi
from Wilmington, DE to Seatac, WA
That's the driving distance. It would take 2 days 1 hour to go from Wilmington, Delaware to Seatac, Washington.
The flight distance (direct flight from Wilmington, DE to Seatac, WA) is 2,362.71 mi.
2,802 mi = 3.22 kms