Domestic flights: After you submit the cancellation request, the travel provider will usually issue the refund within 24 hours. However, as different banks have different refund cycle times, the refund time also depends on the speed of your bank.
International flights: Your booking has been made with the airline or travel agent, not with Tianxun (Skyscanner China). Depending on who you fly with, you may have different options for changes or cancellations. These are usually shown on the website of the airline or travel agent. We would recommend that you check the terms and conditions for changes and refunds on the website where you booked your ticket.