Horizon Air (which links to Alaska Air) has flights to five small cites in or near Washington State
. Infrequent daily service , with all connections via Seattle-Tacoma. There's also a commuter flight on SeaPort Airlines from Portland (PDX) to Eastern Oregon Regional Airport (PDT), which is near Walla Walla and Pasco/Tri-Cities.
'''[[Lewiston]]''', Idaho (next to '''[[Clarkston]]''', Washington) (IATA: LWS)
'''[[Pullman]]''' (IATA: PUW)
'''[[Walla Walla]]''' (IATA: ALW)
'''[[Wenatchee]]''' (IATA: EAT)
'''[[Yakima]]''' (IATA: YKM)