Bangor International Airport is a public use passenger airport located 3 miles ( 5 km ) west in the city of Bangor , in Penobscot County , Maine , United States . For the United States Air Force use of this facility , see Bangor Air National Guard Base and Dow Air Force Base Bangor International Airport is a joint civil-military public airport located 3 m west of the city of Bangor , in Penobscot County , Maine , United States .