There are
312 mi
from St Paul, MN to Waukesha, WI
That's the driving distance. It would take 5 hours 41 mins to go from St Paul, Minnesota to Waukesha, Wisconsin.
The flight distance (direct flight from St Paul, MN to Waukesha, WI) is 276.24 mi.
312 mi = 502.82 kms