Coutts/Ross International Airport (FAA LID: 7S8, TC LID: CEP4) is located 0.5 nautical miles (0.93 km; 0.58 mi) west of Coutts, Alberta, Canada and 0.1 NM (0.19 km; 0.12 mi) west of Sweet Grass, Montana, United States.

Ross International Airport is owned by the U.S. state of Montana and is operated by the Montana Aeronautics Division. Its runway is located on the Canada–US border.

The airport is one of six airports that straddle the Canada–US border. The others are Avey Field State Airport, Whetstone International Airport, International Peace Garden Airport, Piney Pinecreek Border Airport, and Coronach/Scobey Border Station Airport.

The airport is classified as an airport of entry by Nav Canada and is staffed by the Canada Border Services Agency (CBSA). CBSA officers at this airport can handle general aviation aircraft only, with no more than 15 passengers.