During the third trimester (25 to 40 weeks), many healthcare providers and midwives advise staying within a 300-mile radius of home because of potential problems such as high blood pressure, phlebitis, and false or preterm labor.
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Generally, women are not allowed to travel by air after 36 weeks for domestic travel, and after 28 to 35 weeks for international travel. The decision on whether to travel and how far to travel at any time during pregnancy should be a joint decision between you and your healthcare provider or midwife.
Pregnancy travel by car has some of the same risks and rules as traveling by plane, says Nye. The big problem is blood clots, she says. If you are in a car and driving long distances, get out and walk every few hours, she says.
In general, most airlines won't allow you to fly in your last month of pregnancy, though some limit travel as early as 28 or 29 weeks of pregnancy. And international flights often have an earlier cutoff for pregnant passengers than domestic flights, too.