The cost of upgrading your seat or flight with Malaysia Airlines Seat Upgrade can vary depending on several factors, including the route, destination, class of service, availability, and the fare type of your original booking. Additionally, Malaysia Airlines may have different upgrade options, such as upgrading within the same cabin (e.g., from Economy to Economy Plus) or upgrading to a higher class (e.g., from Economy to Business Class).

It's important to note that upgrading to a higher class typically involves a higher cost compared to upgrading within the same cabin. The exact cost for an upgrade will be determined by the airline based on the specific details of your booking and the upgrade option you choose.