It's very easy to cancel a flight with Thai Airways. To begin, go to the Thai Airways official website and sign into your account. Go to the Manage Booking section and enter your booking reference and last name to view the details of your reservation. To confirm the cancellation, choose the exact flight you want to cancel and adhere to the instructions. It's important to read Thai airways cancel flight policy to find out about any costs and limits related to refunds depending on your kind of fare.