What Terminal is United Airlines At BOS? United Airlines operates primarily from Terminal B at Boston Logan International Airport (BOS). This terminal provides passengers with modern amenities, efficient check-in counters, and streamlined security screening for a seamless travel experience. Terminal B features various dining options, retail stores, and comfortable seating areas for passengers to relax before their flights. United Airlines' gates are conveniently located within the terminal, ensuring easy access for travelers. With frequent flights to domestic and international destinations, United Airlines offers a reliable travel option from Boston.