From I-5 Northbound:

Take exit 1B toward City Center/Convention Center, take a slight left onto E 6^th Street, turn left onto Columbia Street, turn right onto Columbia Way. Terminal 1 will be on your left.

From I-5 Southbound:

Take exit 1C for WA-501/E 15^th Street/Mill Plain Blvd, merge onto WA-501/E 15^th Street/Mill Plain Blvd, turn left onto Columbia Street, turn right onto Columbian Way. Terminal 1 will be on your left.