There are
2,519 mi
from Gresham, OR to Slidell, LA
That's the driving distance. It would take 1 day 20 hours to go from Gresham, Oregon to Slidell, Louisiana.
The flight distance (direct flight from Gresham, OR to Slidell, LA) is 2,047.05 mi.
2,519 mi = 3.22 kms