Why Is My Period 3 Days Late After Travel? (Stress, Flights & Hormone Changes Explained) Many women notice that their menstrual cycle changes after traveling. If your period is 3 days late after travel , you are not alone. Long flights, stress, jet lag, and disrupted sleep schedules can temporarily affect your hormones. In most cases, a late period after travel is completely normal and your cycle returns to normal within the next month. This article explains the scientific reasons travel can delay your period , when you should worry, and how to track your cycle easily. 1. Travel Stress Can Delay Ovulation Traveling — especially long distance — can cause physical and emotional stress. When your body experiences stress, it releases the hormone cortisol . High cortisol levels can interfere with the hormones that control ovulation, including: Estrogen Progesterone Luteinizing Hormone (LH) If ovulation happens later than usual, your period will also arrive later....