Prior to the cessation of bus service in March 2019, the DSTT was served by seven bus routes that stopped at all four tunnel stations as well as stops near the former Convention Place station. At each station, bus routes were divided into three bays labeled with their general direction. Bay A was served by three routes heading north toward Northgate and the University District and east to Kirkland via State Route 520; Bay C was served by three routes heading south through the SODO Busway toward the Rainier Valley and Renton; and Bay D was served by a single route, Sound Transit Express route 550, heading east to Mercer Island and Bellevue via Interstate 90.