To change a flight on British Airways, visit the official website and log in to your account. Head to Manage My Booking to modify details or contact customer service via phone or online chat for assistance. Note that changes may incur fees and fare differences. Familiarize yourself with the airline's policies before proceeding. For more details about British Airways Flight Change call a helpline 1 (800) 247-9297 or 1 (844) 902-4930 (OTA-Skip Waiting). Or visit the Airlinespetpolicy site.