From SW 3rd Street & W Orchard Avenue bus to WalMart, bus to Walla Walla Transit Center, North 4th Avenue, Walla Walla, Walla Walla County, Washington, 99324, United States of America, then bus to Tri-Cities Airport. 6 h 11 min $15. From Hermiston taxi to Pasco Airport (PSC). 40 min $188. From Hermiston drive to Pasco Airport (PSC). 40 min $4.