The Glacier Park International Airport services all of northwest Montana, the Flathead Valley and the cities of Kalispell, Whitefish, Columbia Falls, Bigfork, Lakeside, Polson and Libby. Daily scheduled airline service is provided by Delta Airlines, Horizon Air, United Express/SkyWest, and Allegiant Air. Major hubs serviced are: Seattle, Denver, Salt Lake City, Las Vegas, Minneapolis, with seasonal service to Chicago and Atlanta.

Services available to the traveling public include: car rentals, secure public parking, restaurant, retail shop, taxis and shuttles and meeting space.

Also available are general aviation fixed base services including: private air charter, fueling, aircraft repair and maintenance, flight instruction and customs service.