What Terminal is United Airlines At BOS. Terminal B at Boston Logan International Airport is a well-organized, user-friendly terminal that efficiently manages United Airlines operations. Its modern architecture, convenient amenities, and accessible features have made it a favorite choice among United passengers. Whether flying locally or connecting to an overseas destination, passengers can expect a smooth experience whether departing or arriving at this terminal. The combination of dining, shopping, and comfortable waiting spaces allows guests to unwind and enjoy their time at the airport before continuing on their journey.