What happens when your flight gets cancelled? In which cases I will receive only 50% of BA compensation if my flight was cancelled?

When your flight is cancelled, you may be entitled to compensation. Airlines also must provide you alternative flight and care service (food, beverages, hotel etc.) if your flight is delayed for more than 2 hours. If you chose another flight offered by airlines and arrived to destination with less than 2-4 hours delay depending on the flight distance, your compensation may be reduced by 50%.