Codes IATA: IAG, ICAO: KIAG, FAA LID: IAG is for Niagara Falls International airport is located in Niagara County, New York, it is away from 4 ml (6.4 km) east of downtown Niagara Falls. It is controlled and owned by the Niagara Frontier Transportation Authority. The postal address is 2035 Niagara Falls Blvd, Niagara Falls, NY 14304, United States.