Ontario Municipal Airport (IATA: ONO, ICAO: KONO, FAA LID: ONO) is three miles west of Ontario, in Malheur County, Oregon.

[1] The National Plan of Integrated Airport Systems for 2011–2015 categorized it as a general aviation facility.

[2] The first airline flights were Empire Airlines Boeing 247Ds in late 1946; successors West Coast, Air West and Hughes Airwest served Ontario until 1973.

[1] In the year ending September 18, 2019, the airport had 12,930 general aviation aircraft operations, average 35 per day.

61 aircraft were then based at the airport: 55 single-engine, 2 jet, 1 helicopter, and 3 glider.