There are
1,876 mi
from Casper, WY to Middletown, DE
That's the driving distance. It would take 1 day 9 hours to go from Casper, Wyoming to Middletown, Delaware.
The flight distance (direct flight from Casper, WY to Middletown, DE) is 1,600.06 mi.
1,876 mi = 3,018.46 kms