There are
1,125 mi
from Pasadena, CA to Seatac, WA
That's the driving distance. It would take 21 hours 18 mins to go from Pasadena, California to Seatac, Washington.
The flight distance (direct flight from Pasadena, CA to Seatac, WA) is 944.58 mi.
1,125 mi = 1.61 kms