Yellowstone Airport (IATA: WYS, ICAO: KWYS, FAA LID: WYS) is a state-owned public-use airport located adjacent to U. S. 191/U. S. 287 one nautical mile (2 km) north of the central business district of West Yellowstone, a town in Gallatin County, Montana, United States. Although only open from June through September, commercial passenger service is available during those months. Scheduled airline service is subsidized by the federal Essential Air Service (EAS) program.Yellowstone Airport (IATA: WYS, ICAO: KWYS, FAA LID: WYS) is a state-owned public-use airport located adjacent to U. S. 191/U. S. 287 one nautical mile (2 km) north of the central business district of West Yellowstone, a town in Gallatin County, Montana, United States. Although only open from June through September, commercial passenger service is available during those months. Scheduled airline service is subsidized by the federal Essential Air Service (EAS) program.