Some airlines require written documentation from your practice nurse, midwife or obstetrician. This is to confirm you are in good health, that your pregnancy is uncomplicated and your due date. Flying during the first 12 weeks of pregnancy may be considered risky as miscarriage is more common during this early stage.

Yes, it is generally considered safe for most women to fly during the first trimester (before 12 weeks), provided the pregnancy is considered "low-risk" and there are no signs of a threatened miscarriage. However, many women choose to avoid travel during this period not because of the flight itself, but because the first trimester is often the peak of morning sickness and extreme fatigue. The primary medical concern during any stage of pregnancy is the increased risk of Deep Vein Thrombosis (DVT) or blood clots due to prolonged sitting in a pressurized cabin. To mitigate this, doctors recommend wearing compression stockings, staying hydrated, and walking the aisle every 30 to 60 minutes. It is a common myth that airport security scanners or high-altitude radiation are harmful to the fetus; at standard commercial altitudes, the exposure is negligible. Before you book, you should always consult your OB-GYN or midwife for a personal assessment, especially if you have a history of complications. Most importantly, ensure your travel insurance covers pregnancy-related care, and check the Zika virus status of your destination, as the first trimester is the most critical window for fetal development.