There are
1,567 mi
from Sioux City, IA to Seatac, WA
That's the driving distance. It would take 1 day 2 hours to go from Sioux City, Iowa to Seatac, Washington.
The flight distance (direct flight from Sioux City, IA to Seatac, WA) is 1,305.58 mi.
1,567 mi = 1.61 kms