Hévíz–Balaton Airport (IATA: SOB, ICAO: LHSM), previously also known as Sármellék International Airport (Hungarian: Sármelléki nemzetközi repülőtér), is an international airport in Hungary located west of Lake Balaton, 1 kilometer (0.6 mi) south-southwest of the village of Sármellék, Zala County, and Keszthely. It gains importance due to the proximity of Lake Balaton, Hungary's most important holiday resort, and the thermal spas of Hévíz and Zalakaros.