Miles between Rockford, IL and Billings, MT

There are
1,151 mi
from Rockford, IL to Billings, MT

That's the driving distance. It would take 20 hours 16 mins to go from Rockford, Illinois to Billings, Montana.

The flight distance (direct flight from Rockford, IL to Billings, MT) is 991.46 mi.

1,151 mi = 1.61 kms