What Terminal is Spirit Airlines at ORD? Spirit Airlines operates out of Terminal 3 at Chicago O’Hare International Airport (ORD). This terminal is primarily used for domestic flights, with Spirit Airlines offering a range of affordable flights across the U.S. Passengers can access several amenities, including dining and shopping options, within Terminal 3. Spirit Airlines passengers should arrive early to navigate check-in and security, especially during busy travel periods. Convenient transportation options, including the Airport Transit System, taxis, and ride-sharing, make it easy to reach Terminal 3.