Visit the British Airways website and log in to your account.
Access the "Manage My Booking" section.
Enter your booking reference and last name to retrieve your reservation.
Select the flight you wish to cancel and click on the "Cancel Flight" option.
Review the cancellation details and any applicable fees or refund options.
Confirm the cancellation to complete the process.
Alternatively, you can call British Airways Cancellation customer support and request assistance with canceling your flight. Remember to check the fare rules and cancellation policy associated with your ticket type to understand any potential charges or refunds.