There are
2,436 mi
from Boise, ID to Middletown, DE
That's the driving distance. It would take 1 day 18 hours to go from Boise, Idaho to Middletown, Delaware.
The flight distance (direct flight from Boise, ID to Middletown, DE) is 2,094.48 mi.
2,436 mi = 3.22 kms