Aprrox 150 miles. It is 111 miles from SD to San Bernardino, and then you take highway 18 or 38 up to Big Bear. Highway 38 on the San Bernardino side isn't a bad road up. Not much snow up there this year, but the lake is nice and nice shops.
The Big Bear Mountain resorts is located California. The Big Bear Mountains is a ski resort that was open in the year 1952. The address of the Big Bear Mountains resort is 880 Summit Blvd, Big Bear Lake, CA 92315.