It depends on the airline's policy and the type of ticket you have purchased. Some airlines allow you to cancel a flight even after check-in, but they may charge a fee for doing so. Other airlines have strict no-cancel policies, meaning that you will not be able to cancel the flight or receive a refund after check-in.

Yes, you can technically cancel a flight after you have checked in, but the process is slightly more complex than a standard cancellation. In 2026, most airlines require you to "un-check-in" first, either through their mobile app or by calling their customer service line, before the system will allow a cancellation or refund request. If you have a refundable ticket, you can usually cancel up until a few hours before departure for a full return. For non-refundable tickets, you may only receive a future flight credit, and you must act before the "no-show" window (typically 30–60 minutes before departure). It is critical to cancel before the plane takes off; once the flight has departed, the ticket is usually forfeited. If you checked bags, you must visit the airport counter to have them retrieved before the flight can be officially cancelled and your status updated in the system.