Partas was founded on July 25, 1989, and started its operations in 1991, a time when
Philippine Rabbit and rival
Fariñas Transit ruled the Ilocos routes; with millionaire Santiago Rondaris' Times Transit shut down for good due to labor disputes (later became
Dominion Bus Lines); and
St. Joseph sidelined by hard times. Partas Bus Lines, as a company, was incorporated by Luis
Chavit Singson and Rolito Go at
Laoag (
Ilocos Norte). Partas is one of two bus companies in the Ilocos Region to have ever fielded a double-decker bus (the other being Fariñas). The principal provincial terminals are at
Laoag,
Vigan,
Candon,
Bangued,
Baguio,
San Fernando, La Union, and, starting in 2014, a sub-station in
Pagudpud, Ilocos Norte. In Metro Manila, the main hub is at
Cubao,
Quezon City, which deploys trips to majority of its provincial destinations, except for Baguio. Trips to and from the majority of its provincial destinations, except for Baguio, are available via their terminal in
Pasay. One of the latest routes added to Pasay terminal is
Pasay to
Pagudpud, Ilocos Norte, and vice versa. The latest terminal within Metro Manila was opened in
Sampaloc district of
Manila. This terminal principally caters to goods traders in
Binondo and
Divisoria districts of Manila, and students in Manila's
University Belt who hail from
Laoag,
Bangued, Abra and
Pagudpud, Ilocos Norte. Partas also has inter-provincial trips in Northern Luzon, running between
Baguio,
Vigan,
Laoag,
Bangued, Abra,
San Fernando, La Union,
Bolinao, Pangasinan,
Tuguegarao, Cagayan and
Santiago, Isabela. ==Fleet==