There are a number of reasons why your refund cannot be processed by the airline, which are:
- Your ticket has been used.
- You have used a part of the tickets in your booking, while the airline doesn’t allow partial refund.
- You have checked in to your flight.
- Your ticket has passed its validity period.
If one of the reasons above apply to you, your ticket, including its add-ons, will no longer be refundable.