You can request a refund for your ticket in the following two cases:
1. Your have a Premium ticket: you can request a refund in Manage my booking. Click on "Cancel and refund" an then confirm the refund request. Cancellation fees of $65 per flight and per passenger apply.
2. Your flight has been canceled: you can request a refund by completing the following form: https://forms.gle/Ae1g4oiXCveck5DEA