Miles between Billings, MT and Decatur, IL

There are
1,289 mi
from Billings, MT to Decatur, IL

That's the driving distance. It would take 22 hours 37 mins to go from Billings, Montana to Decatur, Illinois.

The flight distance (direct flight from Billings, MT to Decatur, IL) is 1,068.91 mi.

1,289 mi = 1.61 kms