Hello, first of all, not all air tickets can be rebooked. If you can rebook, you can log in to the mobile Ctrip client again, click on the lower right corner - My - All Orders to enter the air ticket order, and then click [Refund and Change Policy] to view Whether your ticket can be changed, and the costs incurred, after confirming that it is acceptable, click "Change" to operate. <br/>If it can help you, please click the green "Accept", thank you.
If you want to change the route after booking the ticket, you can only refund the booked ticket (loss of refund fee), and then re-book the ticket for the new route.