There are
1,842 mi
from Kansas City, MO to Seatac, WA
That's the driving distance. It would take 1 day 7 hours to go from Kansas City, Missouri to Seatac, Washington.
The flight distance (direct flight from Kansas City, MO to Seatac, WA) is 1,500.06 mi.
1,842 mi = 1.61 kms