There are
1,428 mi
from Gilbert, AZ to Seatac, WA
That's the driving distance. It would take 1 day 3 hours to go from Gilbert, Arizona to Seatac, Washington.
The flight distance (direct flight from Gilbert, AZ to Seatac, WA) is 1,118.50 mi.
1,428 mi = 2,298.75 kms