Sun Country Airlines operates from Terminal 5 at O’Hare International Airport (ORD). This terminal is known for handling most international flights but also accommodates some domestic carriers like Sun Country. During my recent trip, I found Terminal 5 to be modern and easy to navigate, with clear signage and a variety of dining and shopping options. The check-in process was smooth, and security moved quickly, even during busy hours. If you’re wondering what terminal is Sun Country at O’Hare, it’s Terminal 5, offering a convenient and comfortable experience for travelers.