What Terminal is Spirit Airlines At BOS? Spirit Airlines operates from Terminal B at Boston Logan International Airport (BOS). This terminal is known for its efficient facilities, offering a range of amenities for travelers, including dining options, shops, and comfortable waiting areas. Passengers flying with Spirit can enjoy easy access to check-in counters, security checkpoints, and boarding gates within Terminal B. The terminal's layout is designed for quick navigation, making it convenient for travelers looking for a hassle-free airport experience. Spirit Airlines typically provides budget-friendly flights to various domestic destinations from this terminal, making it a popular choice for cost-conscious flyers departing from Boston.