Does Eva air have 24 hour cancellation policy ? If you purchase a ticket for an EVA Air flight to/from the United States at least one week (168 hours) prior to the flight's departure date, you can cancel your reservation within 24 hours of purchase and receive a full refund. To do so, you can call EVA Air customer service or submit a refund request online. The refund will be processed within 7 days for credit card payments and 20 days for cash or check payments.