Many women have doubts whether they can travel at the time of pregnancy, rather making sure that there is nothing which can harm the baby. But one must  rest and be assured that there is absolutely no harm in travelling.
There are certain restrictions, which have to be followed:

• Women having a healthy, normal pregnancy are free to fly at any time, but as the doctors suggest, women shouldn’t fly, after the 36th week of their pregnancy, because there are chances where she might start with her labor pains any time.
   
• Air line companies , do specify certain limits for pregnant ladies depending on the flight being national or international
  
  
• They won’t allow her to fly before 30 days of her delivery date.
   
• While others won’t let you fly, when you’re due date is 7 days away.
   
• Women with high risks of premature labor should not travel.
   
• Women with poorly controlled diabetes, placental abnormalities, and hypertension are also advised not to travel.

Women in their first or third trimester should always discuss their travelling plans with their “health care provider”, who can always advice whether it’s safe for them to fly.
Submitting a note from the doctor to the airlines authority, also works, because they not only provide you with every possible necessity, but also take extra precautions in order to avoid any possible mishap.
Pregnancy and your blood circulation:
This is the time period when its safest to fly, your morning sickness is almost gone and the risks of miscarriage is also lowered , but still one really needs to be concerned about “circulation”.
Pregnancy often causes problems of Blood circulation. While flying, there are increased chances of blood clotting.
Following are the ways to keep your blood flowing:

• Wear lose fitting, comfortable clothes.
   
• Do not cross your legs while you sit.
   
• Drink plenty of water, in order to keep yourself hydrated.
   
• Investing in compression stockings is a good idea, which will keep the blood flowing from your heart and lungs to your ankles.

Seat belts:
Do not feel shy in asking for a seat which is a bit more room. This is provided with an extra long and stretchable seat belts and enough space to stretch your legs.  These are the emergency seat row, especially made for pregnant ladies.
Safety:
One of the major concerns among the pregnant women is that it might not be safe for them to walk through the metal detectors at the airport. But, this is absolutely safe for them, for a simple reason that these are not x-ray machines, which will cause harm to their babies.
Cabin pressure issues also concerns certain women. The heart rate and the blood pressure, increases to help your body with the oxygen intake, when the pressure fluctuates.
For many women this is not a major problem, but those who have cardiovascular problems, are strictly recommended not to travel as it might be harmful.