When you cancel your flight and request for a refund in 24 hours from when you book it, you will get a refund of the full paid amount.
Also, flights that are canceled in the given time when there are 7 days to departure are entitled to a full refund. Other than that, there will be refund charges applied.
In the case of domestic flights, for a refund, the ticket has to be canceled before 24 hrs of flight departure. All the refunds with or without cancellation fees are done with respect to payment methods.