Miles between Boulder, CO and Mill Creek, WA

There are
1,307 mi
from Boulder, CO to Mill Creek, WA

That's the driving distance. It would take 22 hours 52 mins to go from Boulder, Colorado to Mill Creek, Washington.

The flight distance (direct flight from Boulder, CO to Mill Creek, WA) is 998.44 mi.

1,307 mi = 1.61 kms