Bel Aire is a city in Sedgwick County, Kansas, United States, and a suburb of Wichita. As of the 2020 census, the population of the city was 8,26…Bel Aire is a city in Sedgwick County, Kansas, United States, and a suburb of Wichita. As of the 2020 census, the population of the city was 8,262. Bel Aire was founded in January 1955 when a group of local residents petitioned the county government to create it as an improvement district for water.