What Terminal is Frontier Airlines At BOS? Frontier Airlines operates out of Terminal E at Boston Logan International Airport (BOS). Terminal E is primarily used for international flights but also serves some domestic carriers like Frontier Airlines. The terminal offers various amenities, including dining options, retail stores, and comfortable seating areas. Passengers flying with Frontier Airlines can expect efficient check-in and security procedures, ensuring a smooth travel experience. Terminal E’s modern facilities and services cater to the needs of all travelers, providing a pleasant journey through Boston Logan International Airport.