You have many possibilities to cancel your flight, and the first thing that comes to mind is a refund. So, yes, you can cancel your flight, and Thai Airways will give you a full refund. But for that, you should know about the Thai Airways cancellation policy, and for the procedure, you can read the steps below.

Make your visit to the official site of Thai Airways.
Then go through the manage booking option and enter your booking number and last name.
Then you can review all your ticket details, click the edit option and cancel your ticket.
Now you have to explain your cancelation, and then you will be asked to complete a refund form.
You must fill in all your necessary details and tap the submit button.

At last, you will be notified by the Airline that you have successfully canceled your ticket, and your refund will be transferred within 14 business days.

How many fees do I pay to cancel a Thai Airways flight?

Your cancellation fee depends on your journey type and the distance the flight covers. The fees mostly stay between $100 to $200. So you do not need to worry about it much.