For most commercial flights, the boarding process typically begins 30 to 45 minutes before the scheduled departure time for domestic routes, and 45 to 60 minutes before departure for international long-haul flights. Airlines aim to have the aircraft fully loaded and the cabin doors closed at least 15 minutes before the "pushback" time to ensure an on-time departure. Large wide-body aircraft, such as the Airbus A380 or Boeing 777, often start boarding even earlier due to the sheer volume of passengers. It is important to note that the "Boarding Time" printed on your pass is when the first group (usually pre-boarding for those with disabilities or elite status) starts; if you arrive at the gate only 15 minutes before departure, you risk being denied boarding as the flight may have already "closed." Always monitor the gate screens, as boarding can occasionally start earlier if the plane is ready or later if there are maintenance or crew delays.