There are
1,160 mi
from Downey, CA to Sammamish, WA
That's the driving distance. It would take 22 hours 1 min to go from Downey, California to Sammamish, Washington.
The flight distance (direct flight from Downey, CA to Sammamish, WA) is 968.61 mi.
1,160 mi = 1.61 kms