Regardless if your flight is of international or domestic nature, Copa Airlines permits cancellation and changes subject to specific conditions according to your ticket type, travel route, and booking method Usually, the travelers that cancel their reservation within 24 hours after booking and at least 7 days prior to the flight are the ones who receive a full refund without having to pay any cancellation fee. After the mentioned period, fees will be charged based on the fare class which can be Promo, Classic, or Full, where the Full class allows the most flexibility in terms of cancellation and refund.
link:-https://lowestairlinesdeal.com/copa-airlines-cancellation-policy/