There are
1,662 mi
from Nampa, ID to Festus, MO
That's the driving distance. It would take 1 day 4 hours to go from Nampa, Idaho to Festus, Missouri.
The flight distance (direct flight from Nampa, ID to Festus, MO) is 1,409 mi.
1,662 mi = 2,673.98 kms