Sun Country Airlines operates out of Terminal 5 at Chicago O'Hare International Airport (ORD). This terminal, known for handling international flights, also serves select domestic airlines, including Sun Country. The check-in process at Terminal 5 is straightforward, with self-service kiosks and helpful staff at the counters. After passing through security, travelers can enjoy a variety of dining options like Tortas Frontera along with shops for last-minute essentials. counters. https://medium.com/@peterrparker099/what-terminal-is-sun-country-at-ohare-a-detailed-guide-9ffff6caf59b