There are
2,049 mi
from Naperville, IL to Seatac, WA
That's the driving distance. It would take 1 day 11 hours to go from Naperville, Illinois to Seatac, Washington.
The flight distance (direct flight from Naperville, IL to Seatac, WA) is 1,710.92 mi.
2,049 mi = 3.22 kms