Billings Logan International Airport (IATA: BIL, ICAO: KBIL, FAA LID: BIL) is in the western United States, two miles (three kilometers) northwest of downtown Billings, in Yellowstone County, Montana. It is the fourth largest airport in Montana, having been surpassed in recent years by Bozeman, Missoula, and Flathead County (Kalispell) in both number of gates as well as annual enplanements. Owned by the city of Billings, the airport is on top of the Rims, a 500-foot (150 m) cliff overlooking the downtown core, and covers 2,500 acres (1,000 hectares) of land.

The National Plan of Integrated Airport Systems for 2011–2015 categorized it as a primary commercial service airport (more than 10,000 enplanements per year). According to Federal Aviation Administration records, the airport had 387,368 passenger boardings (enplanements) in 2013, 388,329 in 2010 and 397,073 in 2009.

Billings Logan International Airport has scheduled nonstop flights to several airline hubs such as Dallas/Fort Worth, Denver, Minneapolis/St. Paul, Portland, Salt Lake City, Phoenix, Chicago, and Seattle. Billings also serves as a small hub for Cape Air, a commuter airline which operates nonstop flights with Cessna 402 prop aircraft within Montana to Glasgow, Glendive, Havre, Sidney, and Wolf Point.