You can book your flight as usual up to your 29th week of pregnancy, as long as you haven’t had any complications or medical concerns.
If you’re travelling during or after your 29th week of pregnancy, you will need to bring a medical certificate or letter signed by your doctor or midwife. You may not be accepted on the flight if you travel without one.
The letter needs to include:
Confirmation of a singleton or multiple pregnancy
That there are no complications during the pregnancy
The estimated date of delivery
The latest date your doctor expects you to be fit to travel
That you are in good health
That there is no known reason that would prevent you from flying.