There are
1,644 mi
from Boise, ID to Sycamore, IL
That's the driving distance. It would take 1 day 3 hours to go from Boise, Idaho to Sycamore, Illinois.
The flight distance (direct flight from Boise, ID to Sycamore, IL) is 1,394.78 mi.
1,644 mi = 1.61 kms