Travel during pregnancy is okay but this is a situation where common sense should prevail. Long drives should be broken up so that you can get out of the car every two to three hours and walk. This will help prevent blood clots from forming in your legs. The same is true of travel by plane. Make sure you walk or vigorously move your legs every two to three hours to maintain active circulation in your legs. Traveling far away from home in the third trimester could result in having your birth in an unfamiliar place.  Use your best judgment when planning trips during pregnancy.