Ontario International Airport (IATA: ONT, ICAO: KONT, FAA LID: ONT) is an international airport two miles east of downtown Ontario, in San Bernardino County, California, United States, about 38 mi (61 km) east of downtown Los Angeles and 18 mi (29 km) west of downtown San Bernardino. It is owned and operated under a joint-powers agreement with the city of Ontario and San Bernardino County.

The airport covers 1,741 acres (705 ha) and has two parallel runways. It is the West Coast air and truck hub for UPS Airlines and is a major distribution point for FedEx Express. As of September 2018, ONT has more than 64 daily departures and arrivals.