There are
1,778 mi
from St Joseph, MO to Sammamish, WA
That's the driving distance. It would take 1 day 6 hours to go from St Joseph, Missouri to Sammamish, Washington.
The flight distance (direct flight from St Joseph, MO to Sammamish, WA) is 1,456.36 mi.
1,778 mi = 1.61 kms