The closest airport to Glacier National Park is Glacier Park International Airport (FCA), situated approximately 30 miles from the park's west entrance. This convenient transportation hub serves as the primary gateway for visitors traveling by air to explore the stunning natural beauty of Glacier National Park.
https://airportsterminal.com/b....log/closest-airport-

United Airlines operates out of Terminal C at Newark Liberty International Airport (EWR). Terminal C is a modern and spacious facility that offers a wide range of amenities and services to passengers traveling with United Airlines.
https://airportsterminal.com/u....nited-airlines/unite

Asiana Airlines is a South Korean airline that operates flights to and from John F. Kennedy International Airport (JFK) in New York City. Asiana Airlines is a member of the Star Alliance and offers a range of domestic and international flights from JFK.
https://airportsterminal.com/a....siana-airlines/asian