How many miles from Rapid City Mi to San Diego?

Answer 1

It is 387 miles according to Google Maps.

In Addition:

It is 405 miles taking this route:

1. Take SD-79 SOUTH, from Rapid City, to U.S. 18; turn right onto U.S. 18 WEST.
2. Take U.S. 18 WEST to I-25 SOUTH, in Wyoming.
3. Take I-25 SOUTH to DENVER.

Answer 2

350 miles to Denver and 300 miles to the Colorado state line.