When you purchase Avios directly through the British Airways Executive Club or the Avios website, they typically appear in your account almost immediately. However, the official policy states that it can take up to 36 to 72 hours for the transaction to fully process and for the points to be reflected in your balance. If you are buying Avios to book an urgent "Reward Flight," it is best to do so at least a day in advance to avoid disappointment. It is also important to distinguish "purchased" Avios from those earned via partners: Avios from online shopping portals can take up to 5 days to show as "pending" and 35+ days to be awarded, while flight-earned Avios usually credit within 3 to 5 working days after your flight departs. If your purchased Avios have not appeared after 72 hours, you should contact the Executive Club customer service with your transaction receipt to initiate a manual claim.