There are
1,134 mi
from Rosemead, CA to Seatac, WA
That's the driving distance. It would take 21 hours 28 mins to go from Rosemead, California to Seatac, Washington.
The flight distance (direct flight from Rosemead, CA to Seatac, WA) is 949.98 mi.
1,134 mi = 1,825.23 kms