There are
3,055 mi
from Brockton, MA to Seatac, WA
That's the driving distance. It would take 2 days 6 hours to go from Brockton, Massachusetts to Seatac, Washington.
The flight distance (direct flight from Brockton, MA to Seatac, WA) is 2,497.45 mi.
3,055 mi = 4.83 kms