expiry date(the date after which an official document, agreement, etc. is no longer valid, or after which something should not be used or eaten • Check the expiry date of your credit cards. OALD Alexander Demidov)
departure date(при сопоставлении с датой обратного рейса: Your return date is on or before your departure date (сообщение в системе бронирования о неверно указанной дате) sankozh)