Air Busan's official check-in guidance lists check-in closing 30 minutes before departure for domestic flights and 50 minutes before departure for international flights. These are deadlines to complete check-in, not safe times to first reach the airport. The airline recommends arriving two hours before international flights departing Busan and three hours before international flights departing Incheon. Its published counter locations include Terminal 2, third-floor E counters at Incheon and the international terminal's second-floor D area at Gimhae. Counter locations and opening times can vary by flight and airport conditions. Verify the exact terminal and counter for your booking.