By following the below-given points, you can avoid paying the flight cancellation fee.
Book a refundable ticket to get rid of paying cancellation fees.
Buy travel insurance that covers cancellation fees, as well as other travel expenses, in the event of a trip cancellation.
Check for travel waivers that waive cancellation fees for certain reasons, such as inclement weather or a medical emergency.
If you have to cancel your flight, be polite and understanding to the customer service agent. They may be more likely to waive the cancellation fee if you are nice to them.