There are
2,635 mi
from Reading, PA to Walla Walla, WA
That's the driving distance. It would take 1 day 22 hours to go from Reading, Pennsylvania to Walla Walla, Washington.
The flight distance (direct flight from Reading, PA to Walla Walla, WA) is 2,146.44 mi.
2,635 mi = 3.22 kms