According to EVA Air's 24-hour cancellation policy, passengers can cancel a flight booked with EVA Air within 24 hours of purchase. EVA Air will fully reimburse your ticket costs if the booking was made a week or more before the departure date of your EVA Air flight. EVA Air has the right to change the cancellation at any time within 24 hours. https://www.cancellation-policy.com/eva-air-cancellation-policy