The Amazing Race 19 is the nineteenth installment of the reality television show The Amazing Race. The Amazing Race 19 features eleven teams of two, each with a pre-existing relationship, in a race around the world. The 19th season premiered on September 25, 2011. The nineteenth cycle started on Sunday, September 25, 2011. It aired on CBS in the United States on Sunday nights at 8:00 p.m. ET/PT with the season finale on December 11, 2011. The show is hosted by Phil Keoghan.