Miles between Thornton, CO and Dubuque, IA

There are
853 mi
from Thornton, CO to Dubuque, IA

That's the driving distance. It would take 15 hours 12 mins to go from Thornton, Colorado to Dubuque, Iowa.

The flight distance (direct flight from Thornton, CO to Dubuque, IA) is 764.86 mi.

853 mi = 1,372.99 kms