Spirit Airlines operates out of Terminal 3 at O'Hare Airport in Chicago. Travelers flying with Spirit will find check-in counters, security screening, and gates located within this terminal. It's important to arrive early, as Spirit Airlines often has specific boarding procedures. Spirit Terminal O'Hare Airport offers a variety of amenities, including food options and seating areas, ensuring passengers can comfortably wait for their flights at O'Hare Airport.