Hévíz–Balaton Airport (IATA: SOB, ICAO: LHSM), previously also known as Sármellék International Airport (Hungarian: Sármellék Nemzetközi Repülőtér), is an international airport in Hungary located west of Lake Balaton, 1 kilometre (0.6 mi) south-southwest of the village of Sármellék, Zala County and Keszthely.