There are
1,741 mi
from Boise, ID to Appleton, WI
That's the driving distance. It would take 1 day 6 hours to go from Boise, Idaho to Appleton, Wisconsin.
The flight distance (direct flight from Boise, ID to Appleton, WI) is 1,378.36 mi.
1,741 mi = 1.61 kms