Sun Country Airlines Chicago O’Hare International Airport serves both domestic and international flights out of Terminal 5 at Chicago O'Hare International Airport (ORD). The terminal has nice waiting areas, dining options, luggage services, and check-in counters. It is recommended that travelers arrive early for boarding and security checks. Travelers can visit the Sun Country service counter at the terminal or get in touch with customer care for information about flights, help with check-in, or other questions.