Santa usually only goes along the Western side where there are three main cities and believers.
There are lots of believers here because they are so close to where Santa is thought to live. Many think he lives in Greenland, Canada or Russia which could all be possible. NORAD usually picks him up in the Eastern Russia area though.
After leaving Greenland, Santa will rebound back to Northern Canada and down to United States Of America. Usually the first stop he has, So he has so much energy!