ICAO		IATA		Other		Location
KEFC				EFC		Belle Fourche [Muni], South Dakota, US (5 mi / 8 km N)
KSPF		SPF		SPF		Spearfish [Black Hills-Clyde Ice Field], South Dakota, US (13 mi / 21 km S)
				SD91		Spearfish [Star Aviation Number 1 Heliport], South Dakota, US (14 mi / 22 km S)
				SD90		Spearfish [Mitchells Strip], South Dakota, US (14 mi / 23 km S)
				2SD5		Sturgis [Sturgis Heliport], South Dakota, US (25 mi / 40 km SE)
				SD35		Sturgis [Bruch Airfield], South Dakota, US (25 mi / 41 km SE)
				SD26		Sturgis [Mike Jacob Sturgis Heliport], South Dakota, US (26 mi / 42 km SE)
				SD24		Sturgis [Eden Valley Airport], South Dakota, US (27 mi / 44 km SE)
				49B		Sturgis [Muni], South Dakota, US (29 mi / 47 km SE)
				3SD5		Lead [Dilligaf Heliport], South Dakota, US (31 mi / 49 km S)
				W43		Hulett [Muni], Wyoming, US (35 mi / 57 km W)
				2SD0		Nemo [Paradise Valley Airport], South Dakota, US (39 mi / 63 km SE)
				WY55		Sundance [Taylor Field], Wyoming, US (41 mi / 65 km SW)
				WY56		Hulett [Pierce Ranch Airport], Wyoming, US (41 mi / 66 km NW)
				WY14		Hulett [Ipy Ranch Airport], Wyoming, US (41 mi / 67 km W)
				WY53		Four Corners [Moburg Aero Airport], Wyoming, US (43 mi / 69 km S)
				SD25		Piedmont [Infinity Landing Airport], South Dakota, US (43 mi / 69 km SE)
				DETO		Devils Tower National Monument [Devils Tower NM], Wyoming, US (43 mi / 69 km W)
KRCA		RCA		RCA		Rapid City [Ellsworth AFB], South Dakota, US (52 mi / 83 km SE)
				0SD3		Hoover [Bledsoe Ranch Airport], South Dakota, US (52 mi / 84 km NE)