I was talking to my doctor about this when we first found out i was pg as we were thinking about flying to Qld for christmas (would only be a few hours flying time). She said it would be fine as it's not a long distance, but just to make sure to have a short walk around frequently and drink lots of water, as pg women are more at risk of developing blood clots. How far do you think you would be flying? If it's just a short trip it should be ok, as should a long trip (like overseas), but depending on the distance maybe have a chat to your GP about it?