Miles between Boulder, CO and New Castle, PA

There are
1,423 mi
from Boulder, CO to New Castle, PA

That's the driving distance. It would take 1 day 1 hour to go from Boulder, Colorado to New Castle, Pennsylvania.

The flight distance (direct flight from Boulder, CO to New Castle, PA) is 1,306.63 mi.

1,423 mi = 1.61 kms