Miles between Boulder, CO and Deerfield, IL

There are
1,027 mi
from Boulder, CO to Deerfield, IL

That's the driving distance. It would take 18 hours 12 mins to go from Boulder, Colorado to Deerfield, Illinois.

The flight distance (direct flight from Boulder, CO to Deerfield, IL) is 917.90 mi.

1,027 mi = 1.61 kms