O'Neal Airport (IATA: OEA, ICAO: KOEA, FAA LID: OEA) was a public use airport owned by Vincennes University and located in Lawrence County, Illinois, United States.

[3] The airport was one nautical mile (1.85 km) west of the central business district of Vincennes,[3] a city in Knox County.

O'Neal Airport covered an area of 250 acres (100 ha) at an elevation of 414 feet (126 m) above mean sea level.

[3] For the 12-month period ending August 31, 2004, the airport had 8,000 general aviation aircraft operations, an average of 21 per day.

At that time there were 18 aircraft based at this airport: 67% single-engine, 22% multi-engine, 6% helicopter and 6% ultralight.