Blackwell–Tonkawa Municipal Airport (IATA: BWL, ICAO: KBKN, FAA LID: BKN, formerly 4O3) is a public use airport located in Kay County, Oklahoma, United States.

The airport is five nautical miles (9 km) southwest of the central business district of Blackwell, Oklahoma and is owned by the cities of Blackwell and Tonkawa.

[1] Blackwell–Tonkawa Municipal Airport covers an area of 209 acres (85 ha) at an elevation of 1,030 feet (314 m) above mean sea level.

It has one runway designated 17/35 with an asphalt surface measuring 3,501 by 60 feet (1,067 x 18 m).

[2] For the 12-month period ending May 6, 2008, the airport had 2,400 general aviation aircraft operations, an average of 200 per month.