The general recommendation is to stop flying once you reach 36 weeks of pregnancy for a singleton pregnancy. If you have a multiple pregnancy or pregnancy complications, it is advised to avoid flying from 32 weeks onward. Airlines often follow this guideline and may not permit pregnant women to fly beyond 36 weeks without medical clearance. The reason for this cutoff is to avoid the risk of preterm labor or obstetric emergencies during the flight. It is advisable to consult a healthcare provider before flying during pregnancy and to check specific airline policies beforehand. The safest time for air travel during pregnancy is usually the second trimester, and special precautions should be taken to reduce the risk of deep vein thrombosis on longer flights.