Air travel when pregnant
The airlines may have different rules for travelling when pregnant. Check this with the airline before you fly.
Most airlines have no restrictions until 4 weeks before the due date, as long as your health is good in other respects. Short flights are often allowed between 2 and 4 weeks before the due date, with a doctor's certificate. You cannot reckon on being allowed to fly, if there are less than 2 weeks to go before your due date.
If you are expecting twins or multiple births, the travel restriction may apply earlier, often from 12 weeks before the due date. Check this with your airline.