It is situated between the 37th Street/USC and Manchester stations on the J Line, a bus rapid transit route which runs between El Monte, Downtown Los Angeles and San Pedro as part of the Metro Busway system.

[6] Slauson station is used by the Metro J Line bus rapid transit route which runs between the El Monte Station in El Monte, Downtown Los Angeles and the Harbor Gateway Transit Center in Gardena, California, with select trips continuing on to San Pedro.

[8] J Line buses run 24 hours a day between El Monte Station, Downtown Los Angeles, and the Harbor Gateway Transit Center, as route 910.

[9] In addition to J Line buses, the busway platforms at Slauson station are also served by the all-day Los Angeles Metro Bus route 460 to Disneyland.

[8] Slauson station is also served by several bus routes that use bus stops near to the station on surface streets: LA Metro Bus route 45 that runs between Lincoln Heights and Rosewood via Broadway, 81 that runs between Eagle Rock and South Los Angeles via Figueroa, 108 that runs between Marina del Rey and Pico Rivera via Slauson and the LADOT DASH Southeast shuttle route that serves the South Park neighborhood.