If you’re flying with “Spirit Airlines from Chicago O’Hare” , it’s important to know that Spirit Airlines operates out of Terminal 5. This terminal is dedicated to international flights and serves as the main hub for many low-cost carriers, including Spirit. When you arrive at Chicago O’Hare, follow the signs to Terminal 5 for Spirit Airlines check-in and boarding. Terminal 5 offers a range of amenities and services to make your travel experience as smooth as possible.