Seems like it's only unlucky in the west. The number four is considered unlucky in Asia.
What’s So Unlucky About the Number 13?
Researchers estimate that as many as 10 percent of the U.S. population has a fear of the number 13, and each year the even more specific fear of Friday the 13th, known as paraskevidekatriaphobia, results in financial losses in excess of $800 million annually, as people avoid marrying, traveling or in the most severe cases, even working. But what’s so unlucky about the number 13, and how did this numerical superstition get started?
What’s So Unlucky About the Number 13?