There are
2,114 mi
from Decatur, IL to Seatac, WA
That's the driving distance. It would take 1 day 12 hours to go from Decatur, Illinois to Seatac, Washington.
The flight distance (direct flight from Decatur, IL to Seatac, WA) is 1,733.94 mi.
2,114 mi = 3.22 kms